SECTION: POWER AND CONTROL CABLE

Table of contents

SN DESCRIPTION PAGE NO.

1 POWER & CONTROL CABLES 2

[ FOR WORKING VOLTAGES UP
TO AND INCLUDING 1100V]

2 HV POWER CABLES 7
[ FOR WORKING VOLTAGES FROM
3.3KV AND INCLUDING 33KV]

3 EHV XLPE POWER CABLES 8

[ FOR WORKING VOLTAGES FROM
66KV UP TO AND INCLUDING 500KV]

4 CABLE DRUMS 9

5 TYPE TESTS 10

STANDARD TECHNICAL DATASHEETS

[UP TO AND INCLUDING 1100V

XPLE INSULATED POWER CABLE Sheet 1 of 3

PVC INSULATED POWER CABLE Sheet 2 of 3
PVC INSULATED CONTROL CABLE Sheet 3 of 3

Technical Specification, Section: Power and Control Cable Page: 1 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
 SECTION: POWER & CONTROL CABLES

1. POWER & CONTROL CABLES[ FOR WORKING VOLTAGES

UP TO AND INCLUDING 1100 V]

CRITERIA FOR SELECTION OF POWER & CONTROL CABLES

1.1.1. Aluminium conductor XLPE insulated armoured cables shall be used for
main power supply purpose from LT Aux. Transformers to control room,
between distribution boards, supply to oil filtration units, DG supply to
AC distribution board and for supply for colony lighting from control
room.

1.1.2 Aluminium conductor PVC insulated armoured power cables shall be used
for various other applications in switchyard area/control room except for
control/protection purposes.

1.1.3 For all control/protection purposes, PVC insulated armoured control

cables of minimum 2.5 sq. mm. size with stranded Copper conductors
shall be used.

1.1.4 POWERGRID has standardised the sizes of power cables for various
feeders. Bidders are to estimate the quantity of cables and quote
accordingly. The sizes of power cables to be used per feeder in different
application shall be as follows:

S.No. From To Cable size Cable type

1. Main Switch LT Transformer 2-1C X 630 XLPE
Board mm2
per phase
1-1C X 630
mm2
for neutral
2. Main Switch AC Distribution 2-3½C X 300 XLPE
2
Board Board mm
3. Main Switch Oil Filtration Unit 1-3½C X 300 XLPE
2
Board & looping to mm
other oil
filtration units.
4. Main Switch Colony Lighting 1-3½C X 300 XLPE
Board mm2

Technical Specification, Section: Power and Control Cable Page 2 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
 5. Main Switch HVW pump LCP 1-3½C X 300 XLPE
Board mm2
6. Main Switch Main Lighting 1-3½C X 300 XLPE
Board distribution mm2
board
7. AC Distribution D.G. Set AMF 2-3½C X 300 XLPE
Board Panel mm2
8. AC Distribution Emergency 1-3½C X 70 PVC
Board Lighting mm2
distribution
board
9. AC Distribution ICT MB 1-3½C X 70 PVC
Board mm2
10. AC Distribution Bay MB 1-3½C X 70 PVC
Board mm2
11. Bay MB AC Kiosk 1- 3 ½ x 35 PVC
mm2
12. AC Distribution Battery Charger 1-3½C X 70 PVC
Board mm2
13. DCDB Battery 2-1C X 150 PVC
mm2
14. DCDB Battery Charger 2-1C X 150 PVC
mm2
15. DCDB Protection/PLCC 1-4C X 16 mm2 PVC
panel
16. Main Lighting Lighting 1-3½C X 35 PVC
DB panels(Indoor) mm2
17. Main Lighting Lighting panels 1-3½C X 70 PVC
DB (outdoor) mm2
18. Main Lighting Receptacles 1-3½C X 35 PVC
DB (Indoor) mm2
19. Main Lighting Receptacles 1-3½C X 70 PVC
DB (Outdoor) mm2
20. Lighting Panel Sub lighting 1-4C X 16 mm2 PVC
panels
21. Lighting Panel Street Lighting 1-4C X 16 mm2 PVC
Poles
22. Lighting Panel/ Lighting Fixtures 1-2C X 6 mm2 PVC
Sub lighting (Outdoor)
panels
23. Bay MB Equipments 1-4C X 16 mm2 PVC
/1-4C X 6 mm2
/1-2C X 6 mm2

Technical Specification, Section: Power and Control Cable Page 3 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
1.1.5 Bidder may offer sizes other than the sizes specified in clause 1.1.4. In
such case and for other application where sizes of cables have not been
indicated in the specification, sizing of power cables shall be done
keeping in view continuous current ( including future bays/load
requirement), voltage drop & short-circuit consideration of the system.
Relevant calculations shall be submitted by bidder during detailed
engineering for purchaser’s approval. The entire power and control
cables & special cables (if any) required shall be executed by
contractor for completion of present scope of work.

1.1.6 Cables shall be laid conforming to IS : 1255.

1.1.7 While preparing cable schedules for control/protection purpose, following

shall be ensured:

1.1.7.1 Separate cables shall be used for AC & DC.

1.1.7.2 Separate cables shall be used for DC1 & DC2.

1.1.8 For different cores of CT & CVT separate cable shall be used

1.1.9 At least one (1) cores shall be kept as spare in each copper control cable
of 4C, 5C or 7C size whereas minimum no. of spare cores shall be two (2)
for control cables of 10 core or higher size.

1.1.10 For control cabling, including CT/VT circuits, 2.5 sq.mm. size copper
cables shall be used per connection. However, if required from voltage
drop/VA burden consideration, additional cores shall be used. Further for
potential circuits of energy meters, separate connections by 2 cores of 2.5
sq.mm. size shall be provided.

1.1.11 Standard technical data sheets for cable sizes up to and including 1100V
are enclosed at Annexure. Cable sizes shall be offered/manufactured in
accordance with parameters specified in standard technical data sheets.
Technical data sheet for any other cores/sizes required during detailed
engineering shall be separately offered for owner’s approval by the
contractor/supplier. Submission of standard technical data sheets for
these cable sizes are not required for approval. Contractor/supplier
shall intimate name of proposed approved cable manufacturer along
with cable sizes, its quantity required during detailed engineering for
purchaser’s information and acceptance.

Technical Specification, Section: Power and Control Cable Page 4 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
1.2. TECHNICAL REQUIREMENTS

1.2.1. General

1.2.1.1. The cables shall be suitable for laying in racks, ducts, trenches, conduits
and underground buried installation with uncontrolled back fill and
chances of flooding by water.

1.2.1.2. They shall be designed to withstand all mechanical, electrical and thermal
stresses under steady state and transient operating conditions. The XLPE
/PVC insulated L.T. power cables of sizes 240 sq. mm. and above shall
withstand without damage a 3 phase fault current of at least 45 kA for at
least 0.12 second, with an initial peak of 105 kA in one of the phases at
rated conductor temperature (70 degC for PVC insulated cables and 90
degC for XLPE insulated cables). The armour for these power cables
shall be capable of carrying 45 kA for at least 0.12 seconds without
exceeding the maximum allowable temperature of PVC outer sheath.

1.2.1.3. The XLPE insulated cables shall be capable of withstanding a conductor

temperature of 250°C during a short circuit without any damage. The PVC
insulated cables shall be capable of withstanding a conductor temperature
of 160°C during a short circuit.

1.2.1.4. The Aluminium/Copper wires used for manufacturing the cables shall be
true circular in shape before stranding and shall be uniformly good quality,
free from defects. All Aluminium used in the cables for conductors shall be
of H2 grade. In case of single core cables armours shall be of H4 grade
Aluminium.

1.2.1.5. The fillers and inner sheath shall be of non-hygroscopic, fire retardant
material, shall be softer than insulation and outer sheath shall be suitable
for the operating temperature of the cable.

1.2.1.6. Progressive sequential marking of the length of cable in metres at every

one metre shall be provided on the outer sheath of all cables.

1.2.1.7. Strip wire armouring method (a) mentioned in Table 5, Page-6 of IS : 1554
(Part 1) – 1988 shall not be accepted for any of the cables. For control
cables only round wire armouring shall be used.

1.2.1.8. The cables shall have outer sheath of a material with an oxygen index of
not less than 29 and a temperature index of not less than 250°C.

1.2.1.9. All the cables shall pass fire resistance test as per IS:1554 (Part-I)

Technical Specification, Section: Power and Control Cable Page 5 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
1.2.1.10. The normal current rating of all PVC insulated cables shall be as per
IS:3961.

1.2.1.11. Repaired cables shall not be accepted.

1.2.1.12. Allowable tolerance on the overall diameter of the cables shall be plus or
minus 2 mm.

1.2.2. XLPE Power Cables

1.2.2.1. The XLPE (90°C) insulated cables shall be of FR type, C1 category

conforming to IS:7098 (Part-I) and its amendments read alongwith this
specification. The conductor shall be stranded aluminium circular/sector
shaped and compacted. In multicore cables, the core shall be identified
by red, yellow, blue and black coloured strips or colouring of insulation. A
distinct inner sheath shall be provided in all multicore cables. For XLPE
cables, the inner sheath shall be of extruded PVC of type ST-2 of IS:5831.
All cables shall be of armoured type. For single core cables, the
armouring shall consist of aluminium wires/strips. The outer sheath shall
be extruded PVC of Type ST-2 of IS:5831 for all XLPE cables.

1.2.3. PVC Power Cables

1.2.3.1. The PVC (70°C) insulated power cables shall be of FR type, C1 category,
conforming to IS: 1554 (Part-I) and its amendments read alongwith this
specification and shall be suitable for a steady conductor temperature of
70°C. The conductor shall be stranded aluminium. The Insulation shall
be extruded PVC to type-A of IS: 5831. A distinct inner sheath shall be
provided in all multicore cables. All cables shall be of armoured type.
For multicore armoured cables, the inner sheath shall be of extruded
PVC. The outer sheath shall be extruded PVC to Type ST-1 of IS: 5831
for all cables.

1.2.4. PVC Control Cables

1.2.4.1. The PVC (70°C) insulated control cables shall be of FR type C1 category
conforming to IS: 1554 (Part-1) and its amendments, read alongwith this
specification. The conductor shall be stranded copper. The insulation
shall be extruded PVC to type A of IS: 5831. A distinct inner sheath shall
be provided in all cables. All cables shall be of armoured type. The
over sheath shall be extruded PVC to type ST-1 of IS: 5831 and shall be
grey in colour.

1.2.4.2. Cores shall be identified as per IS: 1554 (Part-1) for the cables up to five
(5) cores and for cables with more than five (5) cores the identification of

Technical Specification, Section: Power and Control Cable Page 6 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
 cores shall be done by printing legible Hindu Arabic Numerals on all cores
as per clause 10.3 of IS 1554 (Part-1).

2. HV POWER CABLES[ FOR WORKING VOLTAGES FROM

3.3 kV AND INCLUDING 33 kV]
2.1. HV POWER CABLE FOR AUXILIARY POWER SUPPLY

(a) The HV cable of 1Cx185 mm2 (Aluminium Conductor) or

1Cx120mm2 (Copper Conductor) of voltage class as specified for
630 kVA and 800 kVA LT transformer for interconnecting 630kVA
and 800 kVA LT transformer to the SEB feeder shall be, XLPE
insulated, armoured cable conforming to IS 7098 (Part-II) or IEC
60502-2 1998. Terminating accessories shall conform to IS 17573-
1992 or IEC 61442-1997/IEC60502-4 1998.

(b) The HV cable of 3Cx95 mm2 (Aluminium Conductor) or 3Cx70mm2

(Copper Conductor) of voltage class as specified for 250kVA LT
transformer for interconnecting 250kVA LT transformer to the SEB
feeder shall be, XLPE insulated, armoured cable conforming to IS
7098 (Part-II) or IEC 60502-2 1998. Terminating accessories shall
conform to IS 17573-1992 or IEC 61442-1997/IEC60502-4 1998.

2.2. Only overhead connection has been foreseen for interconnecting 630 kVA
and 800 kVA, LT transformer to the tertiary of the ICT. However, HV
cable connections in place of overhead connection, if necessary shall also
be in the scope of contractor. In this case contractor shall provide 1C x
185 mm2 (Aluminium Conductor) or 1Cx120mm2 (Copper Conductor),
38/66kV HV cable along with necessary terminating accessories. The
construction of XLPE insulated, armoured HV cable shall be generally
conforming to IS 7098 (Part-III). Terminating accessories shall conform to
IEC60840 1999.

2.3. Bidder may offer sizes other than the sizes specified in clause 2.1 and
2.2. In such case sizing of power cables shall be done keeping in view
continuous current, voltage drop & short-circuit consideration of the
system. Relevant calculations shall be submitted by bidder during
detailed engineering for purchaser’s approval.

2.4. Constructional Requirements

Cable shall have compacted circular Aluminium conductor, Conductor

screened with extruded semi conducting compound , XLPE insulated,
insulation screened with extruded semi conducting compound, distinct
extruded PVC inner sheath ( Type ST-2) with FR properties, armoured

Technical Specification, Section: Power and Control Cable Page 7 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
 with non-magnetic material for single core cables and galvanized steel
wire/strip for multicore cables , followed by extruded PVC outer
sheath(Type ST-2), with FR properties . The armour shall be capable of
withstanding rated short time current of conductor.

2.5 Progressive sequential marking of the length of cable in metres at every

one metre shall be provided on the outer sheath of the cable.

2.6 The cables shall have outer sheath of a material with an Oxygen Index of
not less than 29 and a Temperature index of not less than 250°C.

2.7 Allowable tolerance on the overall diameter of the cables shall be plus or
minus 2 mm.

3. EHV XLPE POWER CABLE [FOR WORKING VOLTAGES

FROM 66 kV UP TO AND INCLUDING 500 kV]

3.1 TECHNICAL REQUIREMENTS

The XLPE insulated, EHV cable shall conform to the requirements of IEC
60502-2 (applicable clauses only) for construction and IEC 60840/
IEC62067 ( as applicable) for testing. The terminating accessories shall
conform to IEC 60840 / IEC62067 ( as applicable).

3.2 The cable shall be of specified EHV grade, single core, unarmoured,
stranded compacted Copper conductor, core screening by a layer of
semiconducting tape followed by a layer of semiconducting compound,
cross linked polyethylene (XLPE) dry cured insulation, insulation screening
with semiconducting compound extruded directly over the insulation,
longitudinal sealing by a layer of non woven tape with water swellable
absorbent over insulation screen, followed by radial sealing (Metal sheath
of Lead alloy ‘E’), metallic screening by concentric layer of plain copper
wire followed by an open helix of copper & overall HDPE sheathed &
graphite coated and conforming to the technical particulars of
specification.

3.3 The construction of cable shall generally conform to the description

mentioned in above mentioned clause of the specification. Bidder may
offer necessary layers such as separation tape, binder tapes etc
additionally as per their manufacturing practices for meeting required
performance of the offered cable. The bidder shall enclose with the bid,
drawing showing cross section of the cable. The conductors screen (non-
metallic semi-conductive) shall be extruded in a single one-time process to
ensure homogeneity and absence of voids.

Technical Specification, Section: Power and Control Cable Page 8 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
3.4 The conductors screen (non-metallic semi-conductive) shall be extruded in
a single one-time process to ensure homogeneity and absence of voids.

3.5 They shall be designed to withstand all mechanical, electrical and thermal
stresses under steady state and transient operating conditions.

3.6 Progressive sequential marking of the length of cable in metres at every

one metre shall be provided on the outer sheath of the cable.

3.7 The cables shall have outer sheath of a HDPE material.

3.8 Repaired cables shall not be accepted.

3.9 Allowable tolerance on the overall diameter of the cables shall be plus or
minus 2 mm.

4 CABLE DRUMS
4.1 Cables shall be supplied in returnable wooden or steel drums of heavy
construction. Wooden drum shall be properly seasoned sound and free
from defects. Wood preservative shall be applied to the entire drum.
Drums offered shall conform to relevant standards. Drum drawings
are not required to be submitted for approval.

4.2 Standard lengths for each size of power and control cables shall be
500/1000 meters. The cable length per drum shall be subject to a
tolerance of plus or minus 5% of the standard drum length. The owner
shall have the option of rejecting cable drums with shorter lengths.
Maximum, One (1) number non standard length of cable size(s) may be
supplied in drums for completion of project.

4.3 A layer of water proof paper shall be applied to the surface of the drums
and over the outer most cable layer.

4.4 A clear space of at least 40 mm shall be left between the cables and the
lagging.

4.5 Each drum shall carry the manufacturer's name, the purchaser's name,
address and contract number and type, size and length of the cable, net
and gross weight stencilled on both sides of drum. A tag containing the
same information shall be attached to the leading end of the cable. An
arrow and suitable accompanying wording shall be marked on one end of
the reel indicating the direction in which it should be rolled.

Technical Specification, Section: Power and Control Cable Page 9 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
4.6 Packing shall be sturdy and adequate to protect the cables, from any
injury due to mishandling or other conditions encountered during
transportation, handling and storage. Both cable ends shall be sealed
with PVC/Rubber caps so as to eliminate ingress of water during
transportation and erection.

5 TYPE TESTS

5.1 All cables shall conform to all type, routine and acceptance tests listed in
the relevant IS.

5.2 XLPE INSULATED POWER CABLES ( For working voltages up to

and including 1100V ):-

5.2.1 Following type tests ( on one size in a contract) as per IS: 7098 (Part 1) –
1988 including its amendments shall be carried out as a part of
acceptance tests on XLPE insulated power cables for working voltages
up to and including 1100 V:

a) Physical tests for insulation

i) Hot set test
ii) Shrinkage test
b) Physical tests for outer sheath
i) Shrinkage test
ii) Hot deformation
iii) Heat shock test
iv) Thermal stability

5.2.2 Contractor shall submit type test reports as per clause no. 9.2 of Technical
Specification, Section: GTR for the following tests-

a) Water absorption (gravimetric) test.

b) Ageing in air oven
c) Loss of mass in air oven
d) Short time current test on power cables of sizes 240 sqmm and
above on
i) Conductors.
ii) Armours.
e) Test for armouring wires/strips.
f) Oxygen and Temperature Index test.
g) Flammability test.

5.3 PVC INSULATED POWER & CONTROL CABLES (For working

voltages up to and including 1100V)-

Technical Specification, Section: Power and Control Cable Page 10 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
5.3.1 Following type tests ( on one size in a contract) as per IS: 1554 (Part 1) -
1988 including its amendments shall be carried out as a part of
acceptance tests on PVC insulated power & control cables for working
voltages up to and including 1100 V:

a) Physical tests for insulation and outer sheath

i) Shrinkage test
ii) Hot deformation
iii) Heat shock test
iv) Thermal stability
b) High voltage test (water immersion test only a.c. test as per clause
no. 16.3.1).

5.3.2 Contractor shall submit type test reports as per clause no. 9.2 of Technical
Specification, Section: GTR for the following-

a) High voltage test (water immersion d.c. test as per clause no. 16.3.2
of IS: 1554 (Part 1) - 1988).
b) Ageing in air oven.
c) Loss of mass in air oven.
d) Short time current test on power cables of sizes 240 sqmm and
above on
i) Conductors.
ii) Armours.
e) Test for armouring wires/strips.
f) Oxygen and Temperature Index test.
g) Flammability test.

5.4 XLPE INSULATED HV POWER CABLES( For working voltages from

3.3 kV and including 33 kV)-

5.4.1 Contractor shall submit type test reports as per clause no. 9.2 of
Technical Specification, Section: GTR for XLPE insulated HV power
cables (as per IS 7098 Part-II including its amendment or as per IEC).

5.5 XLPE INSULATED EHV POWER CABLES ( For working voltages from
66kV up to and including 500 kV)-

5.5.1 Contractor shall submit type test reports as per clause no. 9.2 of Technical
Specification, Section: GTR for XLPE insulated EHV cables ( as per
IEC60840 for cables up to 150 kV & IEC 62067 for cables above 150 kV).

Technical Specification, Section: Power and Control Cable Page 11 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
5.6 TERMINATING & JOINTING ACCESSORIES-

5.6.1 Contractor shall submit type test reports as per clause no. 9.2 of Technical
Specification, Section: GTR for Terminating/jointing accessories as per IS
17573:1992/ IEC 60840:1999/ IEC62067.

Technical Specification, Section: Power and Control Cable Page 12 of 12

C/ENGG/ SPEC/CAB REV. NO: 6
 STANDARD TECHNICAL DATA SHEET
(1.1 kV GRADE XLPE POWER CABLES)

CUSTOMER : POWERGRID CORPORATION OF INDIA LIMITED

SN Name of manufacturer : As per approved list
Cable Sizes 1 C x 630 3½ C x 300
1 Manufacturer's type designation : A2XWaY A2XWY
2 Applicable standard : ----------------------IS: 7098/PT-I/1988 & its referred specifications----------------------
3 Rated Voltage(volts) : -----------------------1100 V grade------------------------------------------------------
4 Type & Category : FR & C1 FR & C1
5 Suitable for earthed or unearthed system : -----------------------for both-------------------------------------------------------------
6 Continuous current rating when laid in air in a ambient temp. of 50 oC
and for maximum conductor temp. of 70 oC of PVC Cables[ For : 732 410
information only]
7 Rating factors applicable to the current ratings for various conditions
of installation: : -------------------------------As per IS-3961-Pt-II-67--------------------------------------

8 Short circuit Capacity

a) Guranteed Short Circuit Amp. (rms)KA for 0.12 sec duration at rated
conductor temperature of 90 degree C, with an initial peak of 105 KA. : 45 KA 45 KA

b) Maximum Conductor temp. allowed for the short circuit duty (deg
C.) as stated above. : --------------------------------------250 oC------------------------------------------------

9 Conductor
a) Material Stranded Aluminium as per Class 2 of IS : 8130
b) Grade : ------------------------------------- H 2 (Electrolytic grade) -------------------------
c) Cross Section area (Sq.mm.) : 630 300/150
d) Number of wires(No.)minimum : 53 30/15
e) Form of Conductor Stranded compacted
Stranded and compacted circular
circular/sector shaped
f) Direction of lay of stranded layers : -------- Outermost layer shall be R.H lay & opposite in successive layers --------
10 Conductor resistance (DC) at 20 oC per km-maximum 0.0469 0.1 / 0.206
11 Insulation
a) Composition of insulation : -------------------------------------Extruded XLPE as per IS-7098 Part(1)-----------------
b) Nominal thickness of insulation(mm) : 2.8 1.8/1.4
c) Minimum thickness of insulation : 2.42 1.52/1.16
12 Inner Sheath
a) Material : --------------------------------Extruded PVC type ST-2 as per IS-5831-84-----------------
b) Calculated diameter over the laid up cores,(mm) : NA 52
c) Thickness of Sheath (minimum)mm : N.A 0.6
d) Method of extrusion NA Pressure/Vacuum extrusion
13 Armour
a) Type and material of armour Al. Wire[ H4
: Gal. Steel wire
grade]
b) Direction of armouring : ----------------------------------left hand--------------------------------------------------
c) Calculated diameter of cable over inner sheath (under armour), mm
: 33.9 53.2

d)Nominal diameter of round armour wire (minimum) : 2 2.5

e)Guranteed Short circuit capacity of the armour for 0.12 sec at room
temperature. 45 KA 45 KA

f) DC resistance at 20 oC (Ω/Km) $ 0.577

14 Outer Sheath
a) Material ( PVC Type) : ST-2& FR ST-2& FR
b) Calculated diameter under the sheath : 38.3 59.50
c) Min.thickness of sheath(mm) : 1.72 2.36
d) Guaranteed value of minimum oxygen index of outer sheath at 27 oC
Min 29.0 Min 29.0

e) Guranteed value of minimum temperature index at 21 oxygen index

Min 250 Min 250

f) colour of sheath : Black Black

15 a) Nominal Overall diameter of cable $ $
b) Tolerance on overall diameter (mm) : ---------------------------------+2/-2 mm-----------------------------------------------------
16 Cable Drums : ----------------- shall conform to IS 10418 and technical specification
a) Max./ Standard length per drum for each size of cable ( single
length) with ±5% Tolerance (mtrs) 1000/500 1000/500

b) Non standard drum lengths : Maximum one(1) non standard lengths of each cable size may be
supplied in drums only over & above the standard lengths as specified
above.(if required for completion of project).
17 Whether progressive sequential marking on outer sheath provided at
1 meter interval : ----------------------------------------- YES -------------------------------------------------

18 Identification of cores
a) colour of cores As per IS 7098 Part(1)
b) Numbering : ----------------------------------------- N.A ---------------------------------------------------
19 Whether Cables offered are ISI marked : ----------------------------------------- YES ---------------------------------------------------
20 Whether Cables offered are suitable for laying as per IS 1255
: ----------------------------------------- YES -----------------------------------------------------

$'- As per manufacturer design data

Document No:C:Engg:STD:GTP:1.1 kV XLPE POWER CABLE Page 1 of 3

 STANDARD TECHNICAL DATA SHEET
(1.1 kV GRADE PVC POWER CABLES)

CUSTOMER : POWERGRID CORPORATION OF INDIA LIMITED

SN Name of manufacturer : As per approved list
Cable Sizes 1 c x 150 3.5 cx 70 3.5 cx 35 4 c x 16 4c x 6 2cx6
1 Manufacturer's type designation : AYWaY AYFY AYFY AYFY AYWY AYWY
2 Applicable standard : ------------ -------------------------IS: 1554/PT-I/1988 & its referred standards----------------------------
3 Rated Voltage(volts) : -----------------------1100 V grade----------------------------------------------
4 Type & Category : FR & C1 FR & C1 FR & C1 FR & C1 FR & C1 FR & C1
5 Suitable for earthed or unearthed system : -----------------------for both------------------------------------------------------
6 Continuous current rating when laid in air in a ambient temp. of
50 oC and for maximum conductor temp. of 70 oC of PVC Cables[ For : 202 105 70 41 24 28
information only]
7 Rating factors applicable to the current ratings for various
conditions of installation: : x-------------------------------As per IS-3961-Pt-II-67---------------------------------------------------------

8 Short circuit Capacity

a) Short Circuit Amp. (rms)KA for 1 sec duration : 11.2 5.22 2.61 1.19 0.448 0.448
b) Conductor temp. allowed for the short circuit duty (deg C.)
: --------------------------------------160 oC-----------------------------------------------------------------------
9 Conductor
a) Material : -------------------------------------STRANDED ALUMINIUM ---------------------------------------------------
b) Grade : ------------------------------------- H 2 (Electrolytic grade) ----------------------------------------------------
c) Cross Section area (Sq.mm.) M-70 M-35
: 150 16 6 6
N-35 N-16
d) Number of wires(No.) : ------------------------------------------- as per Table 2 of IS 8130 ------------------------------------------------
e) Form of Conductor Non-compacted shaped shaped shaped Non-compacted Non-compacted
Standed circular conductor conductor conductor Standed circular Standed circular
f) Direction of lay of stranded layers : -------- Outermost layer shall be R.H lay & opposite in successive layers --------
10 Conductor resistance (DC) at 20 oC per km-maximum
0.206 0.443/ 0.868 0.868/ 1.91 1.91 4.61 4.61

11 Insulation
a) Composition of insulation : -------------------------------------Extruded PVC type A as per IS-5831-84--------------------------
b) Nominal thickness of insulation(mm) : 2.1 1.4/1.2 1.2/1.0 1.0 1.0 1.0
c) Minimum thickness of insulation : 1.79 1.16/0.98 0.98/0.8 0.8 0.8 0.8
12 Inner Sheath
a) Material : --------------------------------Extruded PVC type ST-I as per IS-5831-84----------------------------------
b) Calculated diameter over the laid up cores,(mm) : N.A 27.6 20.4 15.7 11.6 9.6
c) Thickness of Sheath (minimum)mm : N.A 0.4 0.3 0.3 0.3 0.3
13 Armour : -------------------------- as per IS 3975/88 ---------------------------------------------------------------------
a) Type and material of armour Gal.steel Gal.steel Gal.steel
: Al. Wire[H4 grade] Gal. Steel wire Gal. Steel wire
strip strip strip
b) Direction of armouring : ----------------------------------left hand-----------------------------------------------------------------------

c) Calculated diameter of cable over inner sheath (under armour),

mm : 18 28.4 21 16.3 12.2 10.2

d) Nominal diameter of round armour wire/strip : 1.6 4 x 0.8 4 x 0.8 4 x 0.8 1.4 1.4
e) Number of armour wires/strips : -------------------Armouring shall be as close as practicable------------------------------------------
f) Short circuit capacity of the armour along for 1 sec-for info only
: --K x A√t (K Amp)(where A = total area of armour in mm 2& t = time in seconds), K=0.091 for Al & 0.05 for steel

g) DC resistance at 20 oC (Ω/Km) : 0.44 2.57 3.38 3.99 3.76 4.4

14 Outer Sheath
a) Material ( PVC Type) : ST-1& FR ST-1& FR ST-1& FR ST-1& FR ST-1& FR ST-1& FR
b) Calculated diameter under the sheath : 21.2 30.1 22.6 17.9 15 13
c) Min.thickness of sheath(mm) : 1.4 1.56 1.4 1.4 1.4 1.24
d) Guaranteed value of minimum oxygen index of outer sheath at
Min 29.0 Min 29.0 Min 29.0 Min 29.0 Min 29.0 Min 29.0
27 oC
e) Guranteed value of minimum temperature index at 21 oxygen
index Min 250 Min 250 Min 250 Min 250 Min 250 Min 250

f) colour of sheath : Black Black Black Black Black Black

15 a) Overall diameter of cable ;--------------------------------------------------------------------$----------------------------------------
b) Tolerance on overall diameter (mm) : ---------------------------------+2/-2 mm--------------------------------------------------------------------------
16 Cable Drums : ----------------- shall conform to IS 10418 and technical specification
a) Max./ Standard length per drum for each size of cable ( single
length) with ±5% Tolerance (mtrs) 1000/500 1000/500 1000/500 1000/500 1000/500 1000/500

b) Non standard drum lengths Maximum one(1) non standard lengths of each cable size may be supplied in drums only over & above the
: standard lengths as specified above.(if required for completion of project).

17 Whether progressive sequential marking on outer sheath provided : ----------------------------------------- YES -------------------------------------------------------------
18 Identification of cores
a) colour of cores Red R,Y,Bl &Bk R,Y,Bl &Bk R,Y,Bl &Bk R,Y,Bl &Bk Red & Bk
b) Numbering : ----------------------------------------- N.A -------------------------------------------------------------
19 Whether Cables offered are ISI marked : ----------------------------------------- YES -------------------------------------------------------------
20 Whether Cables offered are suitable for laying as per IS 1255
: ----------------------------------------- YES -------------------------------------------------------------

$'- As per manufacturer design data

Document No:C:Engg:STD:GTP:1.1 kV PVC POWER CABLE Page 2 of 3

 TECHNICAL DATA SHEET
(1.1 kV GRADE PVC CONTROL CABLES)

CUSTOMER : POWERGRID CORPORATION OF INDIA LIMITED

SN Name of manufacturer : As per approved list
Cable Sizes 2c x 2.5 3c x 2.5 5c x 2.5 7c x 2.5 10c x 2.5 14c x 2.5 19c x 2.5 27c x 2.5
1 Manufacturer's type designation : YWY YWY YWY YWY YWY YWY YWY YWY
2 Applicable standard : -------------------------IS: 1554/PT-I/1988 & its referred standards----------------------------------
3 Rated Voltage(volts) : ---------------------------------------------------------1100-----------------------------------------------------
4 Type & Category : -------------------------------------------------------FR & C1---------------------------------------------------
5 Suitable for earthed or unearthed system : --------------------------------for both------------------------------------------------------
Continuous current rating when laid in air in a ambient temp.
6 of 50oC and for maximum conductor temp. of 70oC of PVC : 22 19 19 14 12 10.5 9.7 8
Cables[ For information only]
Rating factors applicable to the current ratings for various
7 : -------------------------------As per IS-3961-Pt-II-67----------------------------------------
conditions of installation:
8 Short circuit Capacity
a) Short Circuit Amp. (rms)KA for 1 sec-for information only
: 0.285 0.285 0.285 0.285 0.285 0.285 0.285 0.285
b) Conductor temp. allowed for the short circuit duty (deg C.) o
: --------------------------------------160 C--------------------------------
9 Conductor
a) Material : ----------- Plain annealed High Conductivity stranded Copper (as per IS 8130/84) -----
b) Grade : ------------------------------------- Electrolytic------------------------------------------------------
c) Cross Section area (Sq.mm.) : 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
d) Number of wires(No.) : -------------------- as per Table 2 of IS 8130 ------------------------------------
e) Form of Conductor : --------------------------------------Non-Compacted stranded circular conductor---------
f) Direction of lay of stranded layers : ------------------ Outermost layer shall be R.H lay --------------------------
10 Conductor resistance (DC) at 20 oC per km(maxm) 7.41 7.41 7.41 7.41 7.41 7.41 7.41 7.41
11 Insulation
a) Composition of insulation : -------------------------------------Extruded PVC type A as per IS-5831-84-----------------
b) Nominal thickness of insulation(mm) : 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9
c) Minimum thickness of insulation 0.71 0.71 0.71 0.71 0.71 0.71 0.71 0.71
12 Inner Sheath
a) Material : --------------------------------Extruded PVC type ST-I as per IS-5831-84-----------------
b) Calculated diameter over the laid up cores,(mm) : 7.2 7.8 9.7 10.8 14.4 15.9 18 22.1
c) Thickness of Sheath (minimum)mm : 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
13 Armour : -------------------------- as per IS 3975/99 ------------------------------------------------
a) Type and material of armour Gal. Gal. Gal. Gal. Gal. Gal. Gal.
Gal. Steel
: Steel Steel Steel Steel Steel Steel Steel
wire
wire wire wire wire wire wire wire
b) Direction of armouring : ----------------------------------left land---------------------------------------------
c) Calculated diameter of cable over inner sheath (under
: 7.8 8.4 10.3 11.4 15 16.5 18.6 22.7
armour), mm
d) Nominal diameter of round armour wire / dimensions of
: 1.4 1.4 1.4 1.4 1.6 1.6 1.6 1.6
armour strip
e) Number of armour wires : -------------------Armouring shall be as close as practicable------------------
f) Short circuit capacity of the armour and duration-for info
: --0.05 x A√t (K Amp)(where A = total area of armour in mm2& t = time in seconds)----
only
g) DC resistance at 20 oC (Ω/Km) & Resistivity of armour : --------------As per IS 1554 Part(1), whereever applicable & IS 3975-1999------------------
14 Outer Sheath
a) Material ( PVC Type) : ST-1& FR ST-1& FR ST-1& FR ST-1& FR ST-1& FR ST-1& FR ST-1& FR ST-1& FR
b) Calculated diameter under the sheath : 10.6 11.2 13.1 14.2 18.2 19.7 21.8 25.9
c) Min.thickness of sheath(mm) : 1.24 1.24 1.24 1.24 1.4 1.4 1.4 1.56
d) Guaranteed value of minimum oxygen index of outer sheath
: Min 29.0 Min 29.0 Min 29.0 Min 29.0 Min 29.0 Min 29.0 Min 29.0 Min 29.0
e) Guranteed value of minimum temperature index at 21
Min 250 Min 250 Min 250 Min 250 Min 250 Min 250 Min 250 Min 250
oxygen index
f) colour of sheath : Grey Grey Grey Grey Grey Grey Grey Grey
15 a) Overall diameter of cable : $
b) Tolerance on overall diameter (mm) : ---------------------------------+2/-2 mm---------------------------------------
16 Cable Drums : ----------------- shall conform to IS 10418 and technical specification
a) Max./ Standard length per drum for each size of cable (
: 1000/500 1000/500 1000/500 1000/500 1000/500 1000/500 1000/500 1000/500
single length) with ±5% Tolerance (mtrs)
b) Non standard drum lengths : Maximum one(1) non standard lengths of each cable size may be supplied in
drums only over & above the standard lengths as specified above.(if required for
completion of project).
Whether progressive sequential marking on outer sheath
17 : ----------------------------------------- YES ------------------------------------------
provided
18 Identification of cores :
a) colour of cores R & Bk R,Y &BlR,Y,Bl,Bk&G Grey Grey Grey Grey Grey
b) Numbering
Numeral Numeral Numeral Numeral Numerals
N.A. N.A. N.A. s in s in s in s in in black
black ink black ink black ink black ink ink
19 Whether Cables offered are ISI marked : ----------------------------------------- YES ------------------------------------------
20 Whether Cables offered are suitable for laying as per IS 1255
: ----------------------------------------- YES ------------------------------------------

$'- As per manufacturer design data

Document No:C:Engg:STD:GTP:1.1 kV PVC CONTROL CABLE Page 3 of 3

 Section -LIGHTING SYSTEM (Rev.07)

Sl. No. Description Page No.

1. GENERAL 1
2. GENERAL DESIGN CRITERIA 1
3. SOLAR PV POWER PLANT 2
4. LIGHTING SYSTEM DESCRIPTION 2
5. LIGHTING SYSTEM INSTALLATION WORKS 18

.
Annexure-I Bill of Quantity
Annexure-II Details of Lighting Fixture
Annexure-III Drawing of Portable Flood Light Panel (PFL)
Annexure-IV Drawing of Lighting Pole
Annexure-V Single Line Diagram(C/ENGG/TS/STD/ILLU/TOWNSHIP/01)

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Major Changes in Technical Specification Lighting System (Rev.07 w.r.t. Rev.06):-

1. For Indoor Lighting, LED fixtures to be supplied as per Quantity specified in Technical
Specification.
2. For Outdoor Lighting & GIS Building, LED fixtures have been envisaged in place of
Conventional Sodium Vapor Lamps (Quantity to be supplied as per BPS).
3. Firewall mounted Flood Lights have been envisaged for Transformer & Reactors (to be
supplied as per BPS).
4. Portable Flood Light Panel for Maintenance purpose has been specified. Typical
Drawing is also enclosed (to be supplied as per BPS).
5. Bidder shall be required to submit LM-79 & LM-80 reports for LED Luminaries.
6. Roof top Solar Grid System with battery has been replaced by Roof Top Solar Grid
System of 50kW, 30kW & 20kW for 765kV, 400kV & 220kV Substation respectively
(without Battery) to be integrated in ACDB. (to be supplied as per BPS).
7. Considering maintenance issue of Pole mounted battery, Solar Panel along with battery
used for Street Lighting System has been deleted and Street Lighting using LED
Luminaries is retained.
8. AC Emergency Lighting in GIS building, SPR, DG Area and LT Transformer Area has
been specified.
9. Use of Occupancy Sensor has been deleted.
10. Lighting System for Township & Transit Camp included in line with Rev.05.
11. Stainless steel Panels/Junction Boxes of thickness 1.5 mm for Outdoor application has
been specified.
12. Indoor Lighting Panels Bus Bar has been changed from Copper to Copper/Aluminum
Alloy.
13. Technical Specification for Receptacle RQ-1 (250A) & RQ-2 (400A), 415V, 3-phase has
been included for Oil filtration purpose.
14. All concealed Conduit shall be PVC type and all surface mounted conduit shall be of
Galvanized steel.
15. Lighting Steel tubular Poles painting changed to hot deep galvanizing with PU
(Polyurethane) coating in Suzuki Silver color.
16. Fixtures Model and Vendor names have been deleted and general technical parameters of
LED fixtures have been included for Indoor as well as Outdoor Fixtures.
17. Bottom of Outdoor Lighting Panels mounting height shall be 1000mm from FGL.

Note : Above are major changes made in the Model TS, however Bidder is advised to refer
Technical Specification in detail for other changes in the specification.
 Section -LIGHTING SYSTEM (Rev.07)

1 GENERAL

The scope of work comprises of design, engineering, testing, supply,

installation, testing and commissioning of various lighting fixtures
complete with lamps, supports and accessories, ceiling fans with
electronic regulators, exhaust fans with accessories, lighting panels,
Sub-Lighting Panels, lighting poles with distribution boxes, PVC
conduits, lighting wires, G.I. earth wire, receptacles, tag block &
telephone socket, switchboards, modular switches, junction boxes, pull
out boxes, aluminum ladders for maintenance, solar grid system
complete with accessories.

The following specific areas are included in the scope of lighting as

applicable (as per BPS):

i) Indoor Lighting

a) Control Room cum administrative building

b) Firefighting pump house
c) Switchyard panel rooms
d) GIS Building
e) Township & Transit Camp
f) Other Buildings

ii) Outdoor Lighting

a) Switchyard Area including DG Set & LT Transformer area

b) Street Lighting
c) Open Store

2 General Design Criteria

The illumination system shall be designed on the basis of best

engineering practice and shall ensure uniform, reliable, aesthetically
pleasing and glare free illumination. The finish of the fixtures shall be
such that no bright spots are produced either by direct light source or by
reflection. The diffusers/ louvers used in the lighting fixtures shall be
made of impact resistant polystyrene sheet and shall have no yellowing
property over a prolonged period Illumination. The type of Lighting
Fixture to be used in different areas shall be as per Annexure-I.

For Indoor and Outdoor Illumination, detailed drawings showing the

lighting layout and electrical distribution diagram shall be prepared by
the Contractor and submitted for approval. Conduiting shall be done
as per approved Lighting Layout and no separate drawings for the
same shall be submitted for approval. The above layout drawings will
include disposition and location of lighting fixtures, receptacles, lighting
panels etc. While finalizing the detailed layout of lighting fixtures, the
position/location and layout of equipment should be taken into account
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 1 of 25
 Section -LIGHTING SYSTEM (Rev.07)

to have adequate illumination at desired locations. In false Ceiling,

surface wiring is permissible but all down run conduit will be concealed
in wall below the false Ceiling.
2.1 Indoor Illumination

Indoor illumination shall be done by LED Luminaries as per the

requirement of false ceiling and non-false ceiling of buildings.

2.2 Outdoor Illumination

Outdoor illumination shall be done by LED luminaries as per the

requirement. For Outdoor Switchyard area, LED fixtures shall be
installed at gantry structures (For 400kV & below voltage level) &
available lightning masts (if any). However for 765kV Switchyard, LED
fixtures will be installed at 28 meter height on the towers. For other
outdoor areas, Street Lighting, lighting poles & nearby buildings (if
any) shall be used for installation of LED fixtures. Additional firewall
mounted Flood Lights have to be provided for Transformer & Reactors
as specified in the BPS. Mounting structure /Accessories for Mounting
of LED Lighting Fixtures will be prefabricated and will be hot dip
galvanized.

Portable Flood Light Panel (PFLP): Portable Flood Light Panel along
with fixture is to be supplied as per BPS for maintenance purpose of
the Substation. The detailed drawing for the PFLP shall be as per the
drawing attached in the specification (Annexure-IV). Fixture shall be
FL-2 type on PFLP.

3 Grid Interactive Solar PV Power Plant:

Solar Grid System shall be supplied as specified in BPS. Solar PV

Power Plant of PV array Capacity shall be 50kWp for 765kV
Substation, 30kWp for 400kV Substation and 20kWp for 220kV &
below Substation.

3.1 General

Grid Interactive Solar PV Power Plant of PV array shall be provided

over Control Room building. This installation shall be a supplement
source to Substation ACDB bus, to save on conventional energy
supply from the grid during solar energy generation from the plant. The
equipment and materials shall include but not limited to the following:

a) PV Modules (Crystalline)
b) Module Mounting Structure and frames
c) Array Terminal Box
d) Grid Interactive Inverters
e) Solar AC Panel
f) Cable & Wires
g) Earthing system
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 2 of 25
 Section -LIGHTING SYSTEM (Rev.07)

h) Civil works for Foundation of PV Array

All civil works associated with the installation & commissioning of PV

Array shall be done by the Contractor including necessary structural work,
cost of the same shall be deemed included in the erection work.
The Solar PV Module will be installed over the Control Room Building
while the Inverters, Grid interfacing LT Panels etc. will be placed in
Substation ACDB Room of Control Room Building. The Contractor shall
specify and submit detail GA drawing indicating indoor equipment as well
as PV Array. Contractor shall provide necessary supporting documents to
the employer including typical solar PV module electrical characteristics
including current-voltage (I-V) performance curves and temperature
coefficients of power, voltage and current of the proposed PV Module (s).
3.2 Solar PV Modules
Solar PV module shall include but not limited to the following:
• PV Module shall be mono or poly crystalline high power silicon cells.
• The solar cells shall have anti-reflective surface coating to help to
absorb more light in all weather conditions.
• The PV modules shall comply the relevant standards.
• Each module shall have superior light transmission, tampered &
textured glass with antireflective coating. It shall also have tough multi-
layered polymer back sheet for environmental protection against
moisture & to provide high voltage electrical insulation.
• Solar PV module shall be highly reliable, light weight and shall be
designed to have a long service life.
• Major technical parameters for PV module shall be as under:-
Type Mono or Poly Crystalline silicon
Efficiency >= 16%
Fill factor >=70%
Module frame Non-corrosive and electrolytic ally compatible
with the mounting structure material
Array Thermo-plastic, IP 65, UV resistant
Termination box
Module Rated The nominal power of a single PV module shall
power not be less than 300Wp.

The rated output of any supplied module shall

not vary by more than 3% from average power
rating.
Environmental It shall perform satisfactorily in relative humidity
Conditions up to 95% and temperature between 0-85 deg.
C.

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 3 of 25
 Section -LIGHTING SYSTEM (Rev.07)

Applicable IEC 61215

standards IEC 61730 Part 1 and 2
Salt Mist As per IEC 61701
Corrosion Test

3.3 Module Mounting Structure and frames

• Entire system shall be installed by providing necessary steel
structures. The array structure and its legs shall be made of hot dip
galvanized MS angles or galvanized MS tubular frame. The structure
shall be designed for simple mechanical and electrical installation. It
shall support PV modules at a given orientation, absorb and transfer
the mechanical loads to the ground properly. The minimum thickness
of the galvanization shall be as per Section-GTR.
• The array structure shall be so designed that it will occupy minimum
space without sacrificing the output from SPV panels. The structure
shall be designed to allow easy replacement of any module & shall be
in line with the site requirement. Array structure shall also have tilt
arrangement to adjust the plane of the array for optimum tilt during
erection.
• Minimum Ground Clearance of the lowest part of the module structure
should be at least 700mm.
• All fasteners for supporting conduits, Nut & Bolts shall be of stainless
steel (SS-304 Grade).
• The array structure shall be grounded properly.
3.4 Array foundation
Foundation is to be made above the surface and no grouting to be done.
If any grouting is done on the concrete foundation, necessary modification
shall be done to avoid any seepage to the Ceiling. The base plate
arrangement may be made on RCC blocks. Grade of concrete for all RCC
blocks shall be 1:1.5:3 mix.
3.5 Grid Interacting Inverter

The inverter shall be pure sine wave inverter of high efficiency. Inverters
shall have display to show its own parameters along with the parameters
of PV array connected to the Inverter. The inverter shall be compatible as
On Grid Connected Mode (Synchronization with grid). The inverter shall
include but not limited to the following:
• The inverter shall be highly efficient based on Maximum Power Point
Tracking (MPPT) control providing a fixed DC input voltage to inverter.
MPPT must be able to extract maximum energy from Solar array and
produce 415 V, 3-ph, 50Hz AC to synchronize with the grid through
Substation ACDB panel.
• The Inverter shall not produce Electromagnetic interference (EMI)
which may cause malfunctioning of electronic and electrical

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 4 of 25
 Section -LIGHTING SYSTEM (Rev.07)

instruments including communication equipment, which are located

within the facility in which the inverter is housed
• Inverter shall have facility to display basic parameters of the system
through LED/LCD display.

Display
 Voltage & Frequency
 Power
 Energy

Indications
 DC Input Line Status
 Inverter under voltage/ over voltage
 Inverter over load

Protections
 Over voltage both at input & output
 Over current both at input & output
 Over/ under grid frequency
 Reverse Polarity Protection
 Reverse current to PV array protection
 Short circuit
 Protection against lightning
 Protection against Surge voltage induced at output due to
external source

Major Technical Parameters for Inverter shall be as follows:-

Inverter Capacity 50kW/30kW/20kW

Input DC voltage range As required for the
solar grid
Operation AC voltage 3-phase, 415V+10%
Total Harmonic Distortions on AC side THD<3%
Operating Frequency range 50Hz ± 3%
Power factor of the inverter >0.98 at rated power
Operating ambient temperature -20ºC to +60ºC
Humidity 0 – 95% Rh
Inverter efficiency >=96%
Inverter weighted (EURO) efficiency >=95%
Protection degree As per GTR
Communication interface IEC 61850 Protocol or
through IEC 61850
Safety compliance converter
IEC 62103, IEC 62109
Display type LCD / LED
The manufacturer shall facilitate for smooth interfacing of Inverter (Alarm &
Analog measured Values) with Substation SAS.
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 5 of 25
 Section -LIGHTING SYSTEM (Rev.07)

3.6 Solar AC Panel

AC Power output of Inverters shall be fed to the Solar AC Panel through

suitably rated MCCBs. Output of Solar AC panel shall be connected to
Substation ACDB bus through available MCCB in ACDB Panel.

3.7 Provision for Module Cleaning

For cleaning of the PV Modules, necessary plumbing & piping work shall
be done by tapping from the existing pipeline available at the roof top so
that water is easily available near the PV modules.

4 LIGHTING SYSTEM DESCRIPTION

The lighting system shall comprise of the following:

4.1 AC Normal Lighting System

All the Lighting fixtures connected to the AC Normal Lighting system in

different areas will be fed from the 415 V main lighting distribution board
through Lighting Panel & Sub-lighting panels (SLP).

4.2 AC Emergency Lighting System

The lighting panels of this system will be connected to the 415 V

Emergency lighting distribution board (ELDB) which is fed from diesel
generator during the emergency. This system will be provided in Control
Room building, GIS Building, Switchyard Panel Room, Firefighting pump
house, Switchyard Area including DG Set & LT Transformer Area. AC
Emergency lighting load will be connected to this system which will be
normally ‘ON’. Approximate 25 % of lighting fixtures (distributed over all
above areas) shall be connected on AC emergency lighting system.

4.3 D.C. Emergency lighting System

DC emergency LED lighting fixtures of 8W DC Input Down Lighter shall

be operated on the 220/110V DC system (as per available Station DC
Supply) and will be provided in the strategic locations in Control Room
Building, Fire Fighting Pump House and GIS Building .

The supply to the DC lighting panels shall be automatically switched ON

in case of loss of Normal & Emergency AC supply at station or when
under voltage occurs in the AC MLDB. The DC supply will be
automatically switched OFF after about 3 minutes following the
restoration of supply to normal AC or emergency AC lighting system.

Exit Lightings Signage are to be provided in the all rooms of Control

Room Building, Fire Fighting pump house & GIS Building including

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 6 of 25
 Section -LIGHTING SYSTEM (Rev.07)

Corridors & Staircase so that the operating personnel can safely find their
way even during emergency of total AC failure.

5 LIGHTING SYSTEM DESCRIPTION- TOWHSHIP & TRANSIT CAMP

The scope of work comprises of design, engineering, testing, supply,
installation, testing and commissioning of 415V, 400Amp, Main Township
Distribution board/Energy meter Boards/Flat DBs etc. as per single line
diagram (C/ENGG/TS/STD/ILLU/TOWNSHIP/01), Power and Control
cables, various lighting fixtures complete with lamps, supports and
accessories, ceiling fans complete with electronic regulators, exhaust fans
for toilets and pantry & accessories, lighting panels, lighting poles
complete with distribution boxes, galvanized rigid steel/PVC conduits,
lighting wires, G.I. Earthwire, receptacles, tag block & telephone socket,
bells, boxes for telephone/television & Air-conditioners points,
switchboards, switches, junction boxes, pull out boxes complete with
accessories as outlined in electrical drawings enclosed with tender
documents for various type of quarters, parking, pump house, recreation
centre and transit camp associated with township.
The township lighting system shall comprise of the following:
5.1 EXTERNAL ELECTRIFICATION WORKS
The entire External Electrification work including connection to various
quarters, recreation centers & transit camp associated with township
including street lighting of township shall be in the scope of the contractor.
415V, 400A Main Township distribution board shall be fed from 415V,
1000A Main switchboard (being supplied under LT switchgear package)
located in ACDB/DCDB Room of main Switchyard through 2-3 ½ x300
sq.mm XLPE insulated power cable from each source. Supply of Main
Township DB & associated 3 ½ x300 sq.mm XLPE cable along with
its interconnection, installation etc. shall be as per BPS.

Further typical distribution from 415V Main Township DB is indicated in

the drawings. The entire external electrification work comprising of feeder
pillars, Cables and associated glands and lugs, steel tubular poles, street
lights, MS junction boxes, GI pipes for cable protection, danger plates,
Hume pipes, fire extinguishers, cable route markers etc. as required shall
be in the scope of the contractor. The exact location of quarters,
recreation center, transit camp, streets etc. shall be intimated to
successful bidder during detailed engineering.

5.2 INTERNAL ELECTRIFICATION WORKS

The bidder shall quote for each type of quarters, recreation center and
transit camp separately as per BPS, including entire scope pertaining to
lighting system, earthing and lightning protection.

The scope shall broadly consist of entire concealed conduit work, wiring
for lights/power/fans/telephones/cables & air-conditioners, supply and
fixing of metal boxes, plates, switches, sockets, call bells, buzzers,
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 7 of 25
 Section -LIGHTING SYSTEM (Rev.07)

exhaust fans, ceiling fans, MCBs, MCCBs, light fittings, energy meters
boards & flat DBs etc. as per the requirements of various quarters,
recreation centers and transit camps.

In addition to above complete earthing (through separate earth pit) and

lightning protection for each type of quarters, recreation center and transit
camp shall be provided as per standard guidelines given in relevant
Indian standards and code of practices. The complete drawing for
earthing and lightning protection shall be submitted to owner for approval.
The loop earthing inside the buildings shall be carried out with minimum
1Cx1.5 sq.mm PVC stranded Copper wire. All materials required or
earthing and lightning protection of township buildings shall be in the
scope of contractor.

Any item not specifically outlined in the layouts and specifications

enclosed herein shall necessarily be included by the contractor as per
applicable buildings codes, statutory electricity rules and code of practices
for the completion of scope.
6 DESCRIPTION OF ITEMS
The Contractor shall supply and install the following equipment and
accessories in accordance with the specification and applicable
standards:

6.1 LED LUMINAIRES

LED Luminaries shall be used for the lighting of all the indoor and outdoor
areas. In false ceiling area, LED luminaries shall be recessed mounting
type & in non-false ceiling area, the LED luminaries shall be surface
mounting type.

Suitable heat sink with proper thermal management shall be provided in

the luminaries. All LED Luminaries shall be POWERGRID approved
make. The marking on luminaries & safety requirements of luminaries
shall be as per IS standards.
Necessary Care shall be taken so that there is no water stagnation
anywhere in the Luminaries. The entire housing shall be dust and water
proof protection as per IS 12063.

Parameters of outdoor & indoor Lighting fixtures are detailed in

Annexure-II.

6.2 LIGHTING PANELS

6.2.1 CONSTRUCTIONAL FEATURES OF LIGHTINNG PANELS

i) The Lighting panels shall conform to IS-8623.

ii) All Outdoor Lighting Panels shall be Stainless sheet steel of Grade 304
and shall be dust, weather and vermin proof. Panels shall be of
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 8 of 25
 Section -LIGHTING SYSTEM (Rev.07)

thickness not less than 1.5 mm smoothly finished, leveled and free from
flaws. Stiffeners shall be provided wherever necessary.

iii) The panels shall be of front single door hinged construction, suitable for
either floor mounting on channels, sills or on walls/columns by suitable
M.S. brackets. Indoor Lighting panels shall be modular flush mounted
and wall embedded of slim depth.

iv) All panels shall have a dead front assembly provided with hinged
door(s) and with suitable locking arrangement.

v) All Outdoor panel’s removable covers and doors shall be gasketed all
around with neoprene/EPDM gaskets/ puff arrangement.

vi) The outdoor panels shall be suitable for cable/conduit entry from the
bottom. Suitable removable cable gland-plate shall be provided in the
bottom of panels. For indoor lighting panels the provision of
cable/conduit entry shall be from both top and bottom side with suitable
removable gland plate. The thickness of the gland plate shall be 3 mm.
Necessary number of double compression brass type cable gland shall
be supplied, fitted on to these gland plates.

vii) The panels shall be so constructed as to permit free access to

connection of terminals and easy replacement of parts.

viii)Each panel shall have a caution notice fixed on it.

ix) Each panel will be provided with laminated as built circuit diagram
suitably pasted in the panel.

x) Main Bus Bars

Bus bars shall be of Copper/aluminum alloy conforming to IS: 5082

and shall have adequate cross-section to carry the rated continuous
current and withstand short circuit currents. Maximum operating
temperature of the bus bars shall not exceed 85 deg. C. The bus bars
shall be able to withstand a fault level of 9 kA for 1 sec. for AC panels
and 4 kA for 1 sec. for DC panels.

xi) All Outdoor Lighting Panels shall be erected such that a minimum height
of 1000mm is maintained between FGL & bottom of the Lighting Panel.
Size of Outdoor Lighting panels shall be such that cables are properly
terminated and wires are dressed with provision of loops.

6.2.2 CONFIGURATION OF INDOOR AND OUTDOOR LIGHTING PANELS

(AS PER BPS).

Type of Description Detail Of Feeders

Panel
ACP 1 Indoor AC Bus Bars: 415V, 63A, 3 phase 4
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 9 of 25
 Section -LIGHTING SYSTEM (Rev.07)

Lighting wire bus bars with Colored LED

panel indication lamps with fuse for
each phase.

Incomer: One no. 415V, 63A

TPN MCB with 300mA 63A Four
Pole RCCB.

Outgoings: 12 nos. 230V, 16A

Single Pole MCB and 1 no. 5/15A
Switch with Socket.

Mounting: The indoor ACP shall

be of slim depth suitable for
embedding in the wall and will be
flush mounted.
ACP 2 Outdoor- Bus Bars: 415V, 63A, 3 phase 4
Switchyard wire bus bars with Colored LED
AC Lighting indication lamps with fuse for
panel each phase.

Incomer: One no. 415V, 63A

TPN MCB & Contactor with
suitable Photo-sensitive automatic
switching system.

Outgoings: 6 nos., 230V, 20A

Single Pole MCB and 3 Nos.
230V, 32A TPN MCB and 1 no.
5/15A Switch with Socket.

Mounting: Suitable for Outdoor

applications.
ACP 3 Outdoor - Bus Bars: 415V, 63A, 3 phase 4
Street AC wire bus bars with Colored LED
Lighting indication lamps with fuse for
Panel each phase.

Incomer: One no. 415V, 63A

TPN MCB & Contactor with
suitable Photo- sensitive
automatic switching system.

Outgoings: 3 nos. 32A TPN MCB

and 1 no. 5/15A Switch with
Socket.

Mounting: Suitable for Outdoor

applications.

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 10 of 25
 Section -LIGHTING SYSTEM (Rev.07)

DCP Indoor DC Bus Bars: 220/110V DC (as

Lighting applicable) 32A two wire Bus Bar.
panel
Incomers: 220/110V DC (as
applicable) with one 32A DP
Contactor (for AC fail Logic)
backed up by 32A double pole
MCB with DC test push button.

Outgoings: 6 nos.16 A Double

Pole MCB

Mounting: The indoor DCP shall

be of slim depth suitable for
embedding in the wall and will be
flush mounted
SLP Outdoor AC Incomers: 415V, 32A TPN MCB
Sub-lighting
panel Outgoings: 8 nos. terminal
blocks suitable for cable upto 16
sq. mm cable.

Mounting: Suitable for Outdoor

applications with Loop in and
Loop out facility.
Sub-DB Indoor AC Incomers: 415V, 32A TPN
Sub MCB.
Distribution
Box Outgoings: 6 nos. 230V, 16A
Single Phase feeder with Single
Pole MCB.

Mounting: The Sub-Distribution

Box shall be of slim depth suitable
for embedding in the wall and will
be flush mounted/surface
mounted as per site requirement.

6.2.3 AUXLIARY ITEMS FOR LIGHTING PANELS

(i) TERMINAL BLOCKS

Each terminal shall be suitable for termination of suitable size of

Cable/Wire Conductors without any damage to the conductors or any
looseness of connections.

(ii) RESIDUAL CURRENT CIRCUIT BREAKERSS (RCCB)

For indoor panels (ACP 1), 63A, 4pole 300 mA RCCB conforming IS
12640 will be provided along with incomer.
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 11 of 25
 Section -LIGHTING SYSTEM (Rev.07)

(iii) MINIATURE CIRCUIT BREAKER (MCB)

a) The miniature circuit breakers shall be suitable for manual closing,

opening, automatic tripping under overload and short circuit. The
MCBs shall also be trip free. MCB of Type C tripping characteristics as
per IS 8828 will be used for Illumination purposes.

b) The MCBs and MLDB panel MCCBs together shall be rated for full
fault level. In case the MCB rating is less than the specified fault level
the Contactor shall co-ordinate these breaker characteristics with the
backup MCCB in such a way that if fault current is higher than breaker
rating, the MCCB should blow earlier than the MCB. If the fault current
is less than MCB breaking capacity, MCB shall operate first and not
the incomer MCCB.

c) The MCBs shall be suitable for housing in the lighting panels and shall
be suitable for connection with stranded copper/Al wire connection at
both the incoming and outgoing side by copper/Al lugs or for bus bar
connection on the incoming side.

d) The terminals of the MCBs and the ‘open/trip’ and ‘close’ conditions
shall be clearly and indelibly marked.

(iv) CONTACTORS

Contactors shall be of the full voltage, direct-on line air break, single
throw, electro-magnetic type. They shall be provided with at least
2’NC’ and 2’NO’ auxiliary contacts. 3-Phase Contactor shall be
provided with the three elements, positive acting, ambient temperature
compensated time lagged, hand reset type thermal overload relay with
adjustable settings to suit the rated current. Hand reset button shall
be flush with the front of the cabinet and suitable for resetting with
starter compartment door closed. The Contactor shall check the
adequacy of the Contactors rating, wires with respect to lighting load.

(v) PUSH BUTTONS

All push buttons shall be of push to actuate type having 2 ‘NO’ and 2
‘NC’ self-reset contacts. They shall be provided with integral
escutcheon plates engraved with their functions. Push buttons shall
be of reputed make.

(vi) LABELS

a) Designation labels shall be provided on the front of lighting Panels.

The panel designation labels shall be of 3 mm thick plastic plate.
The letter shall be black engraved on white back ground.

b) All incoming and outgoing circuits shall be provided with labels.

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 12 of 25
 Section -LIGHTING SYSTEM (Rev.07)

Labels shall be made of non-rusting metal or 3 ply lamicoid. Labels

shall have white letters on black or dark blue background.

(vii) EARTHING TERMINALS

Outdoor Panels shall be provided with two separate and distinct

earthing terminals suitable to receive the earthing conductors of size
50x6 G.S. Flat.

6.3 EARTHING & LIGHTNING PROTECTION FOR CONTROL ROOM

BUILDING, GIS BUILDING , TRANSIT CAMP & TOWNSHIP

Earthing and lightning protection system installation shall be in strict

accordance with the latest editions of Indian Electricity Rules, relevant
Indian Standards and Codes of practice and Regulations existing in
the locality where the system is installed.

a) Code of practice for Earthing IS: 3043

b) Code of practice for the protection of Building and allied structures
against lightning IS : 2309.
c) Indian Electricity Rules 1956 with latest amendments.

Lighting Fixtures & Miscellaneous Items For Township Lighting:-

Please refer Annexure-I

6.4 POWER AND CONTROL CABLES:-

Power and Control cables required under township lighting shall

conform to standard technical specification, Section-Power and Control
cables.

6.5 RECEPTACLES (AS PER BPS).

All receptacles shall be of heavy duty type, suitable for fixing on

wall/column and complete with individual switch. The outdoor
Receptacles shall have IP 55 protection. The receptacles shall be of
following types:

Type RO : 20A, 240V, 3 pin type (third pin grounded) plug and socket
with body earthing arrangement with Single Pole MCB, metal clad with
gasket having cable gland entry suitable for 2Cx6 sq.mm.
PVC/aluminum armoured cable and a spring loaded cover suitable for
installation in moist outdoor location. Receptacles shall be housed in a
box made out of 1.5 mm thick Stainless Steel of Grade 304 with
hinged doors with suitable locking arrangements. Door shall be lined
with good quality gasketing.

Type RP - 63A, 3ph, 415V AC receptacles shall be provided for

welding purposes in GIS Halls and near major equipments in
switchyard.63A, 415V, 3 phase, 4 pin interlocked plug and socket with
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 13 of 25
 Section -LIGHTING SYSTEM (Rev.07)

body earthing arrangement with TPN MCB. Receptacles shall be

housed in a box made out of 1.5 mm thick Stainless Steel of Grade
304, with hinged door with suitable locking arrangement The recep-
tacle shall be suitable for 3.5C x 35/3.5Cx70 sq.mm and suitable for
installation in moist outdoor location. Aluminum conductor cable entry
and shall also be suitable for loop-in and loop out connection of cables
of similar size. . Door shall be lined with good quality gasketing.

Type RQ-1 (250A)/ Type RQ-2(400A):- 250A/400A Receptacle

shall be provided for oil filtration purpose near alternate
Transformer/Reactor. 250A/400A, 415V, 3 phase, 4 pin, Switch
Box with body earthing arrangement with TPN MCB, suitable for
outdoor application. The enclosure shall be made out of 1.5 mm
thick Stainless Steel of Grade 304, with hinged door with suitable
arrangement and having cable gland entry suitable for 3.5C X 300
sq.mm XLPE armoured cable. The bus bar shall have adequate
cross-section to carry the rated continuous current and withstand
short circuit currents. The receptacle shall be suitable for loop-in
and loop out connection of cables of similar size. Door shall be lined
with good quality gasketing.

6.6 LIGHTING ACCESSORIES

Various accessories mentioned below shall be supplied as per site

requirement and cost of the same shall be deemed to be included in
overall Lighting System cost.

(i) JUNCTION BOXES

a) The Indoor junction boxes shall be provided with 4 way knockouts suit-
able for two numbers 10 sq. mm. wire/ Cable. These junction boxes
shall be concealed type for indoor lighting.

b) The outdoor junction boxes shall be complete with conduit

knockouts/threaded nuts and provided with terminal strips. The
junction boxes shall be suitable for termination of Cable glands of
required size. The junction boxes shall be provided with 4 way
knockouts suitable for street lighting/switchyard lighting terminals
suitable for 2 numbers 4C x 16 Sq.mm Al. cable or as per requirement.
All Outdoor Junction boxes shall be of Stainless Steel of thickness
1.5mm of grade 304. Outdoor Junction Boxes shall be suitable for
mounting on columns, structures etc for Outdoor Lighting. The outdoor
Junction shall have IP 55 protection.

c) The junction boxes shall have the following indelible markings

(i) Circuit Nos. on the top.
(ii) Circuit Nos. with ferrules (inside) as per drawings.
(iii) DANGER sign in case of 415 volt junction box.

(ii) SWITCH AND SWITCHBOARD

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 14 of 25
 Section -LIGHTING SYSTEM (Rev.07)

a) All Switch board/boxes and electronic fan regulators located in

office/building areas shall be modular flush mounted type.

b) Switch boards/boxes shall have conduit knock outs on all the sides.

c) The exact number of Switches including regulator for fans and layout
of the same in the switchboard shall be suitable as per the
requirement during installation.

d) The maximum number of luminaries controlled by one no. 6 Amp

Switch shall be 8 nos. However each Switchboard shall have minimum
2 Nos. of 6A Switches to control the Luminaries. For DC fixtures there
will be no switch and the same shall be directly controlled from DCP.

e) The Luminaries shall be wired in such a fashion that luminaries on

each phase are evenly distributed all over the room.

f) 6/16A, 240V AC modular flush mounted socket with switch outlet

shall be provided in indoor areas like offices, cabins, Security
Room, Control Room, Switchyard Panel Room etc.

g) 25A, 240V AC modular flush mounted socket with switch shall be

provided at strategic locations in GIS Halls, ACDB/Switchgear room
etc.

(iii) CONDUITS & CONDUIT ACCESSORIES

a) The conduits shall be Rigid PVC conduits of 20/25 /32 mm diameter

for Lighting, Telephone wiring & LAN Cabling and shall be ISI marked.

b) Flexible conduits wherever required shall be PVC type.

c) All conduits accessories shall be ISI marked.

d) Galvanized Steel Conduits for Surface Conductor (e.g. GIS Hall).

(iv) PULL OUT BOXES

a) The pull out boxes shall be concealed type for indoor lighting and
suitable for mounting on column, structures etc., for outdoor lighting.

b) The pull out boxes shall be circular of minimum 16 SWG sheet steel
and shall have cover with good quality gasket lining.

c) The pull out boxes shall be completed with conduit knock

outs/threaded hubs and provided at approximately 3 meters intervals
in a conduit run.

(v) CEILING, WALL MOUNTED & EXAUST FANS AND REGULATORS

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 15 of 25
 Section -LIGHTING SYSTEM (Rev.07)

a) The Contactor shall supply and install 1400 mm sweep ceiling fans
complete with electronic regulator and board for mounting switch,
suspension rod, canopy and accessories. The electronic regulator for
Ceiling fans will be housed in common switchboard for lighting and
shall be of similar make and model as that of modular switches. The
wall mounted fans shall be of 400 mm sweep. Exhaust fans shall be of
300mm size.

b) Winding of the fans shall have Class-E insulating material. Winding

shall be of copper wire.

(vi) LIGHTING WIRES

a) Wiring from Lighting/Sub-Lighting Panels to junction boxes /

Switchboards/ fixtures etc. is covered under Lighting Wires. The wiring
used for lighting shall be standard products.

b) The wires shall be of 630V grade (Phase to ground), PVC insulated

products.

c) The conductor sizes for wires used for point wiring shall be 1.5 sq.mm,
2.5 sq.mm, 4 sq.mm and 6 sq.mm stranded copper wire as required.

d) The wires used for connection of a lighting fixture from a nearest

junction box or for loop-in loop-out connection between two fixtures
shall be single core copper stranded conductor, 630V grade (Phase to
ground) flexible PVC insulated cords, unsheathed, conforming to
IS:694 with nominal conductor cross sectional areas of 2.5 sq. mm.

e) The wires shall be colour coded as follows:

Red for R - Phase

Yellow for Y - Phase
Blue for B - Phase
Black for Neutral
White for DC (Positive)
Grey for DC (Negative)
Green for Earth

6.7 LIGHTING POLES (AS PER BPS).

(i) The Contactor shall supply, store and install the following types of
galvanized steel tubular lighting poles required for street lighting and
decorative lighting, as per the attached drawing of poles.

(i) Type L1 Street Lighting Pole of 6 meter - for SL-L1 type fixture
(ii) Type D1 Post top lantern pole of 4 meter - for Sl-D1 type fixture

(ii) “L1” type poles shall be used for street lighting. “D1” type (Decorative
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 16 of 25
 Section -LIGHTING SYSTEM (Rev.07)

post top lantern) poles and Bollards shall be installed In front of control
room building, Fire Fighting Buildings as finalized during detailed
engineering.

(iii) Lighting poles shall be complete with fixing brackets. Cable

termination box will be built inside the pole itself as per drawing
enclosed.

(iv) Poles and its Cable termination box shall be hot dip galvanized and
PU (Polyurethane) coated in Suzuki silver color and inside with
bituminous paint.

(v) Terminal strips provided in street - lighting poles shall be suitable for
terminating up to 2 nos. 4C x 16 sq. mm aluminum cables.

(vi) Wiring from junction box at the bottom of the pole to the fixture at the
top of the pole shall be done through 2.5 sq. mm Copper wire laid
inside the tubular pole.

(vii) Distance of center of pole from street edge should be approximately

1000 to 1200 mm or as per site conditions.

(viii) Earthing of the poles should be connected to the switchyard main

earth mat wherever it is available, else, the same should be earthed
through 3M long, 20 mm dia, earth electrode.

6.8 LADDER(AS PER BPS).

Following ladders shall be supplied as per BPS for maintenance

purpose of illumination system:
(i) A type Aluminum ladder of 3 Mtr vertical height.
(ii) Cartwheel mounted aluminum ladder Vertical Extendable from 5.1m
to 11m.

7 TYPE TEST REQUIREMENT:

a) Lighting Panels, Receptacles, Junction Boxes etc. shall conform to

following degree of protection:

• Installed outdoor: IP- 55

• Installed indoor in air conditioned area: IP-31
• Installed in covered area: IP-52
• Installed indoor in non-air conditioned area where possibility of entry of
water is limited: IP-41.

b) Lighting fixtures LED type shall conform to type test requirements of

LM-79, LM-80 and TTC.

8 LIGHTING SYSTEM INSTALLATION WORKS

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 17 of 25
 Section -LIGHTING SYSTEM (Rev.07)

8.1 General

In accordance with the specified installation instructions as shown on

manufacturer’s drawings or as directed by Employer, Contractor shall
unload, erect, install, test and put into commercial use all the electrical
equipment included in the contract. Equipment shall be installed in a
neat, workmanship manner so that it is level, Plumb Square and
properly aligned and oriented. Tolerances shall be as established in
manufacturers drawing or as stipulated by Purchaser.

All apparatus, connections and cabling shall be designed so as to

minimize risk of fire or any damage which will be caused in the event
of fire. All Lighting accessories mentioned in Clause 6.7 shall be
supplied and erected as a part of Lighting System Installation works.
Cost of Erection, Foundation & Civil Works of the above accessories
and Lighting Poles are to be included in the Cost of the erection of
Lighting system, no extra payment shall be made on account of the
same.

Further, lighting control in GIS Hall has to be done in staggered way

for the minimum basic illumination. Further separate switchboard shall
be provided to have enhanced lighting for each bay.

8.2 Conduit System

(i) Contractor shall supply, store and install conduits required for the
lighting installation as specified. All accessories/fittings required for
making the installation complete, including but not limited to pull out
boxes (as specified in specification ordinary and inspection tees and
elbow, check nuts, male and female bushings (brass or galvanized
steel), caps, square headed make plugs, nipples, gland sealing
fittings, pull boxes, conduits terminal boxes, glands, gaskets and box
covers, saddle terminal boxes, and all steel supporting work shall be
supplied by the Contractor. In case of false ceiling surface conduiting
is permissible however all down run conduits will be concealed in wall
below the false ceiling. The conduit fittings shall be of the same
material as conduits. Separate Conduit should be laid for
Communication purpose .The contractor shall also supply & install 20
mm PVC conduit and accessories for telephone wiring and LAN
Cabling wherever feasible, telephone and LAN cabling can be laid in
the same conduit.

(ii) In case of false Ceiling surface conduiting (GI Pipe) is permissible

under the ceiling.

(iii) All unarmored cables/wires shall run within the conduits from lighting
panels to lighting fixtures, receptacles. etc.

(iv) Size of conduit shall be suitably selected by the contactor.

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 18 of 25
 Section -LIGHTING SYSTEM (Rev.07)

(v) Conduit support shall be provided at an interval of 750 mm for

horizontal runs and 1000 mm for vertical runs.

(vi) Conduit supports shall be clamped-on spacer plates or brackets by

saddles or U-bolts. The spacer plates or brackets in turn, shall be
securely fixed to the building steel by welding and to concrete or brick
work by grouting or by nylon raw plugs. Wooden plug inserted in the
masonry or concrete for conduit support is not acceptable.

(vii) For directly embedding in soil, the conduits shall be coated with an
asphalt-base compound. Concrete pier or anchor shall be provided
wherever necessary to support the conduit rigidly and to hold it in
place.

(viii) For long conduit run, pull boxes shall be provided at suitable intervals
to facilitate wiring.

(ix) Conduit shall be securely fastened to junction boxes or cabinets, each

with a lock nut inside and outside the box.

(x) Conduits joints and connections shall be made through water-tight and
rust proof by application of a thread compound which insulates the
joints. White lead is suitable for application on embedded conduit and
red lead for exposed conduit.

(xi) The entire GI conduit system (if used) shall be embedded, electrically
continuous and thoroughly grounded. Where slip joints are used,
suitable bounding shall be provided around the joint to ensure a
continuous ground circuit.

(xii) Conduits and fittings shall be properly protected during construction

period against mechanical injury. Conduit ends shall be plugged or
capped to prevent entry of foreign material.

8.3 Wiring

i) The scope also includes wiring from nearest Lighting/Sub-Lighting

Panel to the Controlling Switch/MCB/Lighting Fixtures.

ii) Wiring shall be generally carried out by PVC insulated wires in

conduits. All wires in a conduit shall be drawn simultaneously. No
subsequent drawing of wires is permissible.

iii) Wires shall not be pulled through more than two equivalent 90 deg.
bends in a single conduit run. Where required, suitable junction boxes
shall be used.

iv) Wiring shall be spliced only at junction boxes.

v) For lighting fixtures, connection shall be teed off through suitable

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 19 of 25
 Section -LIGHTING SYSTEM (Rev.07)

round conduit or junction box, so that the connection can be attended

without taking down the fixture.

vi) Maximum two wires can be terminated to each way of terminal

connections.

vii) AC and DC wiring should run through the separate conduits. Similarly
Communication & LAN cables shall run in separate conduit than that
of AC & DC Conduits.

8.4 Lighting Panels

i) The lighting panels shall be erected at the locations to be finalized

during detailed engineering.

ii) Suitable foundations/supporting structures for all outdoor type lighting

panels shall be provided by the Contractor.

iii) The Sub lighting Panel shall be provided where independent switch of
fixtures are required.

8.5 General Requirements for Cabling Work

i) Each cable run shall be tagged with number that appears in the cable
schedules. Cables shall be tagged at their entrance and/or exit from
any piece of equipment, junction or pull box, floor opening etc.

ii) The tag shall be made up of aluminum with the number punched on it
and securely attached to the cable by not less than two turns of G.I.
wire. Cable tags shall be rectangular in shape for power cables and
circular shape for control cables.

iii) Location of cables laid directly under ground shall be indicated clearly
by cable marker made of galvanized iron plate embedded in concrete
block.

iv) The location of underground cable joints if any shall be clearly

indicated with cable marker with an additional inscription "cable joint".

v) The marker, which is a concrete block, shall project 150 mm above

ground and shall be spaced at an interval of 30 meters and at every
change of direction. It shall also be located on both sides of the road
or drain crossing.

vi) Road crossing of cables through suitable size of GI pipe/Hume pipe as

required at site.

8.6 Foundation & civil works

i) Foundation for street lighting poles and panels shall be done by the
Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07
Page 20 of 25
 Section -LIGHTING SYSTEM (Rev.07)

Contractor.

ii) All final adjustment of foundation levels, chipping and dressing of

foundation surfaces, setting and grouting of anchor bolts, sills, inserts
and fastening devices shall be carried out by the Contractor including
minor modification of civil works as may be required for erection.

iii) Any Cutting of masonry/concrete work, which is necessary shall be

done by the Contractor at his own cost and shall be made good to
match the original work.

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 21 of 25
 Section -LIGHTING SYSTEM (Rev.07)
ANNEXURE-I
BILL OF QUANTITY
Sr. Locations Type & No of Lighting Fixture With Anti Type of Fans
No Glare Film
over the
Fixture
01. Control Room cum Administrative Building-Single Storey (As applicable)
(i) Control Room RSQ-I: 10 Nos. Yes --
(ii) Station- In Charge Room RSQ-I: 4 Nos. and RC-I : 4 Nos. Yes --
(iii) Administrative Area RSQ-I: 12 Nos. and RC-I : 9 Yes Pedestal Fans
Nos.
(iv) Conference Room RSQ-I: 9 Nos. and RC-I : 4 Nos. Yes Wall Mounted
Fans
(v) Electrical Room/Telecommunication RSQ-I: 4 Nos. and RC-I : 2 Nos. Yes Wall Mounted
Room Fans
(vi) ACDB/DCDB Room SL-I: 16 Nos. Yes Ceiling Fan
(vii) Battery & Battery Charger Room RL-I: 6 Nos. Yes --
(viii) Corridor & Reception SC/RC-I: 8 Nos. and SL/RL-I: Yes Ceiling Fan
2Nos.
(ix) Toilets SC-I: 2 Nos.(in each Toilet) No Exhaust Fans
(x) Pantry SL-I: 2 Nos. and SC-I: 1 No. Yes Exhaust Fans
(xi) Periphery of the Building BL: 10Nos. No --
02. Control Room cum Administrative Building- Double Storey (As applicable)
(i) Control Room RSQ-I: 12 Nos. Yes --
(ii) Station- In Charge Room RSQ-I: 4 Nos. and RC-I : 2 Nos. Yes --
(iii) Administrative Area RSQ-I: 16 Nos. and RC-I : 12 Yes Pedestal Fans
Nos.
(iv) Conference Room RSQ-I: 9 Nos. and RC-I : 5 Nos. Yes Wall Mounted
Fans
(v) Electronic Test Lab/Telecommunication RSQ-I: 4 Nos. Yes Wall Mounted
Room Fans
(vi) ACDB Room SL-I: 16 Nos. Yes Ceiling Fan
(vii) DCDB Room SL-I: 9 Nos. Yes Ceiling Fan
(viii) Battery & Battery Charger Room RL-I: 6 Nos. Yes --
(ix) Store SL-I: 6 Nos. No --
(x) Lobby/ Waiting Area SSQ-I: 5 Nos. and RC-I : 4 Nos. Yes Ceiling Fan
(xi) Toilet SC-I: 2 Nos. ( in each Toilet) No Exhaust Fans
(xii) Pantry SL-I: 2 Nos. and SC-I: 1 No. Yes Exhaust Fans
(xiii) Corridors SC/RC-I: 36 Nos. and SL/RL-I: No --
6 Nos.
(xiv) Periphery of the Building BL: 15 Nos. No --
03. GIS Building
(i) 765kV, 400kV & 220kV GIS Hall IHB: As per BPS No --
(ii) AHU Room SL-1: : As per BPS Yes --
(iii) C&R Room RSQ-I: : As per BPS Yes --
04. Fire Fighting Pump House
(i) FFPH Building SL-1: 9 Nos. Yes Wall Mounted
Fan
(ii) Periphery of the Building BL: 4 Nos. No --
05. Switchyard Panel Room (SPR) (9 SSQ-I: 10 Nos. Yes --
meter)
06. Switchyard Panel Room (SPR) (6 SSQ-I: 8 Nos. Yes --
meter)
07. Switchyard and Outdoor Substation FL-1 & FL-2: As per BPS No --
Area
08. Street lighting roads SL-LI & SL-DI:As per BPS No --
(Sl. No.3), based on actual area, the Quantity of Lighting Fix

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 22 of 25
 Section -LIGHTING SYSTEM (Rev.07)

TOWNSHIP & TRANSIT CAMP ILLUMINATION (As Applicable)

ANNEXURE-I

Sr. Locations Type & No of Lighting Fixture Anti-Glare Type of Fans

No Film
Requirement
01. Township Quarters
(i) Bed Room SL-I :1 Nos. and SC: 2 Nos. Yes Ceiling Fan
(ii) Drawing Room SSQ-I: 2Nos. and SC 2 Nos. Yes Ceiling Fan
(iii) Dining Room SSQ-I: 2 Nos. Yes Ceiling Fan
(iv) Kitchen SL-I: 1 Nos. and SC: 1 Nos. Yes Exhaust Fan
(v) Lobby SSQ-I and SC 2 Nos. Yes --
(vi) Toilet SC-I: 1 Nos. No Exhaust Fan
(vii) Servant Room SL-I: 1 Nos. Yes Ceiling Fan
(viii) Car Parking BL-I: 1 Nos. No --
(ix) Stair SC-I: 4 Nos. No --
(x) Terrace/Balcony BL-I : 1 Nos. No --
02. Transit Camp
(i) VIP Lounge SSQ-I:2 Nos. and SC: 2 Nos. Yes Ceiling Fan
(ii) Dining Room SSQ-I: 2 Nos. and SC: 2 Nos Yes Ceiling Fan
(iii) Drawing Room SSQ-I: 1 Nos. and 2 Nos. Yes Ceiling Fan
(iv) Dormitory SL-I : 4 Nos. Yes Ceiling Fan
(v) Bed Room SL-I :1 Nos. and SC: 2 Nos. Yes Ceiling Fan
(vi) Store SL-1: 2 Nos. No Exhaust Fan
(vii) Corridors SC-I: 2 Nos. No --
(viii) Terrace/Balcony BL-I : 1 Nos. No --
(ix) Care Taker Room SL-I: 1 Nos. Yes Ceiling Fan
(x) Kitchen SL-I: 1 Nos. Yes Exhaust Fan
(xi) Stair SC-I: 4 Nos. No --
(xii) Toilet SC-I: 1 Nos. No Exhaust Fan
(xiii) Other Rooms SC-I: 2 Nos. No --

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 23 of 25
 Section -LIGHTING SYSTEM
ANNEXURE-II
Details of Lighting Fixture
(a) Indoor Application

SL-1 SC-I
RL-I Type RC-I
(Surface (Surface Type SSQ-1 Type RSQ-1
(Recessed (Recessed Type IHB
Sr. Technical Mounted Mounted (Surface (Recessed
Mounted 4 x Mounted Circular (LED Indoor
No Specification Linear LED Circular LED Mounted 2X2 Mounted 2x2
1 Feet LED LED Downlight High Bay)
Tube with Downlight LED Luminaire) LED Luminaire)
Panel) Luminaire)
Box ) Luminaire)
1 System Wattage ≤ 2 X 20 W ≤ 40 W ≤ 15 W ≤ 15 W ≤ 40 W ≤40 W ≤150W

2 System Lumen Output ≥ 3600 ≥ 3600 ≥ 1200 ≥ 1200 ≥ 3400 ≥ 3400 ≥14000

System efficacy
3 ≥ 100 ≥ 100 ≥ 80 ≥ 80 ≥ 85 ≥ 85 ≥ 100
(Lumens/Watt)
Pressure Die
CRCA CRCA Pressure Die Pressure Die Cast
4 Housing CRCA Housing CRCA Housing Cast Aluminum
Housing Housing Cast Housing Housing
Housing
5 Ingress Protection IP20 IP-20 IP20 IP-20 IP-20 IP-20 IP-65
4kV (Internal) &
6 Surge Protector 2kV 2kV 2kV 2kV 2kV 2kV
10kV (External)
Surface Hanging Type
7 Mounting False Ceiling Surface Mounted False Ceiling Surface Mounted False Ceiling
Mounted under Shed

8 THD <10% <10% <10% <10% <10% <10% <10%

9 CRI >80 >80 >80 >80 >80 >80 >70
10 CCT 5700k±300k 5700k±300k 5700k±300k 5700k±300k 5700k±300k 5700k±300k 5700k±300k
11 Power Factor >0.95 >0.95 >0.95 >0.95 >0.95 >0.95 >0.95
12 Ik Protection NA NA NA NA NA NA IK-05
13 Operating Humidity 90% RH 90% RH 90% RH 90% RH 90% RH 90% RH 90% RH
14 Burning Hours 50,000 50,000 50,000 50,000 50,000 50,000 50,000
15 Operating Temperature -5°C to 45°C
16 Lumen Maintenance 70% at the End of Burning Hours

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 24 of 25
 Section -LIGHTING SYSTEM
Details of Lighting Fixture
(b) Outdoor Application

BL Type SL-L1 Type SL-D1 Type FL-1 Type FL-2

Sr.No Technical Specification (Surface Mounted Bulk (LED Street Light (Pole Mounted LED (LED Flood Light (LED Flood Light
Head) Luminaire) Post Top Luminaire) Luminaries) Luminaries)

1 System Wattage ≤ 10W ≤45W ≤ 30W ≤150W ≤250W

2 System Lumen Output ≥ 800 ≥4000 ≥ 2600 ≥ 14000 ≥ 23000

System efficacy
3 ≥ 80 ≥ 100 ≥ 90 ≥ 100 ≥ 100
(Lumens/Watt)

Pressure Die Cast

Pressure Die Cast Pressure Die Cast
4 Housing Housing and with Pressure Die Cast Die Cast Aluminum
Housing Housing
Polycarbonate diffuser
5 Ingress Protection IP-65 IP-65 IP-65 IP-65 IP-65
6 Surge Protector( Internal) 3kV 3kV 3kV 3kV 3kV
7 Surge Protector( External) 10kV 10kV 10kV 10kV 10kV
Pole Mounting for 40mm Suitable for 60mm max
8 Mounting Wall Mounting On Lattice Structure On Lattice Structure
max O.D O.D
9 THD <20% <10% <10% <10% <10%
10 CRI >70 >70 >70 >70 >70
11 CCT 5700k±300k 5700k±300k 5700k±300k 5700k±300k 5700k±300k
12 Power Factor >0.90 >0.95 >0.95 >0.95 >0.95
13 Ik Protection IK-09 IK-05 IK-05 IK-05 IK-05
14 Operating Humidity 90% RH 90% RH 90% RH 90% RH 90% RH
15 Burning Hours 50,000 50,000 50,000 50,000 50,000
16 Operating Temperature -5°C to 45°C
17 Lumen Maintenance 70% at the End of Burning Hours

Technical Specification, Section: LS ENGG / SPEC / LS REV.NO: 07

Page 25 of 25
 TECHNICAL SPECIFICATION FOR

FIRE PROTECTION SYSTEM

TABLE OF CONTENTS

Clause No. Description Page No.

1.00.00 Intent of Specification 1

2.00.00 Design and construction 2
3.00.00 Tests 14
4.00.00 Spare Parts 16
5.00.00 Horizontal Centrifugal Pumps 16
6.00.00 Diesel Engines 22
7.00.00 Piping, Valves & Specialities 26
8.00.00 Air Vessels 34
9.00.00 Heat detectors/Fire detectors and spray nozzles 35
10.00.00 Portable and Wheel/ Trolley mounted Fire Extinguishers 36
11.00.00 Instruments 38
12.00.00 Electric Motors 41
13.00.00 Battery & Battery chargers 47
14.00.00 Control and Annunciation Panels 49
Appendix-I P&I for Hydrant & HVW Spray System for 765kV
and 400kV Substation
Appendix-II Typical Drawings for location of Fire Detectors and
Extinguishers
Appendix-III Typical Drawings of HVW Spray System for transformer
& reactor
Appendix-IV Technical Data Sheets
Appendix-V List of Approved Vendors
Appendix-VI P&I for Hydrant & HVW Spray System for 220kV
and 132kV Substation

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-i

C/ENGG/SPEC/FP Rev-6
 TECHNICAL SPECIFICATION FOR

FIRE PROTECTION SYSTEM

1.00.00 INTENT OF SPECIFICATION

This section covers the design and performance requirements of the

following types of fire protection systems;

a. Hydrant System

b. High Velocity Water (H.V.W) Spray System

c. Fire Detection and alarm System

d. Portable Fire Extinguishers

e. Wheel/ Trolley mounted Fire Extinguishers

1.00.01 It is not the intent to completely specify all details of design and
construction. Nevertheless, the system design and equipment shall
conform in all respects to high standard of engineering, design and
workmanship and shall be capable of performing in continuous
commercial operation in a manner acceptable to the Owner. The system
design shall also conform to TAC/ NFPA norms.

1.00.02 The scope of work include complete earthwork (i.e. excavation,

backfilling etc.) for the entire buried piping for the system, valve pits and
pipe supports for buried, entrenched and overground piping.

1.00.03 The equipment offered shall comply with the relevant Indian Standards
unless specified otherwise. The equipment conforming to any other
approved international standards shall meet the requirement called for in
the latest revision of relevant Indian Standard or shall be superior. The
Deluge valves, HVW spray nozzles & quartzoid bulb detectors shall
have the approval of any of the following agencies;

a. UL of USA.
b. F M of USA
c. LPCB of UK or
d. VDS of Germany,

1.00.04 Ambient temperature for design of all equipment shall be considered as

50°C.

1.00.05 The piping and instruments diagram for Hydrant and HVW spray system
for 765kV/400kV substations and for 220kV&132kV substation is

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-1 of 56

C/ENGG/SPEC/FP Rev-6
 enclosed at Appendix-I and Appendix-VI respectively. The successful
bidder shall prepare detailed layout and piping drawing based on this
drawing and other drawings such as road, drainage, cable trench, switch
yard layout, etc. as furnished by the Employer during detailed
engineering.

` The typical drawings for location of fire detectors and fire extinguishers
in control cum administrative building attached in Appendix-II with this
section shall be followed for execution.

1.00.06 Equipment under the fire protection system should be supplied from the
suppliers approved by POWERGRID (A list of approved vendors is
enclosed at Appendix-V). All equipment shall conform to the data sheets
attached in Appendix–IV and/or relevant subsections/clauses of this
specification. In case of contradiction between data specification sheets
and relevant subsections/clauses, then stipulations of the data sheets
will prevail.

2.00.00 DESIGN AND CONSTRUCTION

2.01.00 Hydrant System

Hydrant system of fire protection essentially consists of a large network

of pipe, both under ground and over ground which feeds pressurised
water to a number of hydrant valves, indoor (if applicable) as well as
outdoor. These hydrant valves are located at strategic locations near
buildings, Transformers and Reactors. Hose pipes of suitable length
and fitted with standard accessories like branch pipes, nozzles etc., are
kept in Hose boxes. In case of emergency, these hoses are coupled to
the respective hydrant valves through instantaneous couplings and jet of
water is directed on the equipment on fire. Hydrant protection shall be
provided for the following in all substations of voltage levels 132kV and
above (This is not applicable for extension of existing 220kV and
132kV substations where Hydrant system is not available). At least
one hydrant post shall be provided for every 60m of external wall
measurement of buildings.

a) Control room building

b) L.T. Transformer area.

c) Fire Fighting pump House.

d) Stores

e) Transformers

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-2 of 56

C/ENGG/SPEC/FP Rev-6
 f) Shunt Reactors/ Bus Reactors.

2.01.01 A warning plate shall be placed near the hydrant points for the
transformers and reactors substations to clearly indicate that water shall
be sprayed only after ensuring that the power to the transformer/ reactor
which is on fire is switched off and there are no live parts within
20metres of distance from the personnel using the hydrant.

2.02.00. HIGH VELOCITY WATER (H.V.W) SPRAY SYSTEM

H.V.W. spray type fire protection essentially consists of a network of

projectors and an array of heat detectors around the
Transformer/Reactor to be protected. On operation of one or more of
heat detectors, Water under pressure is directed to the projector
network through a Deluge valve from the pipe network laid for this
system. This shall be provided for transformers and reactors in all
132kV & above substations (This is not applicable for extension of
existing 220kV and 132kV substations where HVWS system is not
available). Wet detection initiation system shall be employed for
automatic operation.

The system shall be designed in such a way that the same can be
extended to protect additional Transformer/ Reactor to be installed in
future. However, for the purpose of design it shall be assumed that only
one Transformer/ Reactor will be on fire. The main header pipe size in
the yard shall be 250mmNB (for 400kV and above level substations)
and 200mmNB(for 220kV & 132kV substations). Branch to the
equipment (shall not be more than 20metres length) shall be of the
same size as of deluge valve.

2.02.01 The Electrical clearance between the Emulsifier system pipe work and
live parts of the protected equipment shall not be less than the values
given below :

1. 765 kV bushing 4900 mm

2. 420 kV bushing 3500 mm

3. 245 kV bushing 2150 mm

4. 145 kV bushing 1300 mm

5. 52 kV bushing 630 mm

6. 36 kV bushing 320 mm

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-3 of 56

C/ENGG/SPEC/FP Rev-6
2.02.02 System shall be designed in such a way that the Water pressure
available at any spray nozzle shall be between 3.5bar and 5.0bar and
shall be demonstrated through hydraulic calculations. Water shall be
applied at a minimum rate of 10.2 LPM/M2 of the surface area of the
transformer / Reactor including radiator, conservator, oil pipes, bushing
turrets, etc. (including bottom surface for transformer). The nozzle
arrangement shall ensure direct impingement of water on all exterior
surfaces of transformer tank, bushing turrets, conservator and oil pipes,
except underneath the transformer, where horizontal spray may be
provided. Typical drawings of HVW spray system of a transformer and
a reactor is enclosed at Annexure-III for reference.

2.02.03 Deluge Valve

Deluge Valve shall be water pressure operated manual reset type. The
Deluge valve shall be closed water tight when water pressure in the heat
detector pipe work is healthy and the entire pipe work shall be charged
with water under pressure upto the inlet of the Deluge valve. On fall of
water pressure due to opening of one or more heat detectors, the valve
shall open and water shall rush to the spray water network through the
open Deluge valve. The valves shall be manually reset to initial position
after completion of operation. Each Deluge Valve shall be provided with
a water motor gong which shall sound an alarm when water after
passing through the Deluge valve, is tapped through the water motor.

Each Deluge valve shall be provided with a local panel with provision of
opening of Deluge valve from local and remote from control room/
remote centre. In addition to this, each valve shall be provided with local
operation latch.

Deluge valves of 100mmNB size shall be used if the flow requirement is

≤ 200m3/hr and 150mmNB size shall be used for flow requirement
>200m3/hr.

Test valves shall simulate the operation of Deluge valves and shall be of
quick opening type. The general construction shall conform to
requirements under clause no.7.00.00 for piping, valves and specialities.

2.02.04 High Velocity Spray Nozzles (Projectors)

High velocity spray system shall be designed and installed to discharge

water in the form of a conical spray consisting of droplets of water
travelling at high velocity, which shall strike the burning surface with
sufficient impact to ensure the formation of an emulsion. At the same
time the spray shall efficiently cut off oxygen supply and provide
sufficient cooling.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-4 of 56

C/ENGG/SPEC/FP Rev-6
2.02.05 Minimum set point of the heat detectors used in the HVW spray system
shall be 79oC. The optimum rating shall, however, be selected by the
Bidder, keeping in mind the maximum and minimum temperature
attained at site.
`
2.03.00 Fire Detection and alarm System

This system shall be provided for control room building and Switchyard
panel rooms of substations.

2.03.01 Suitable fire detection system using smoke detectors and/or heat
detectors shall be provided for the entire building, including corridor and
toilets. Fire detectors shall be located at strategic locations in various
rooms of the building. Each Switchyard panel room shall be considered
a separate zone. Adequate number of extra zones shall be provided for
Switchyard panel rooms for future bays identified in Single line diagram
of the substation. The operation of any of the fire detectors/ manual call
point should result in the following;

1. A visual signal exhibited in the annunciation panels indicating the

area where the fire is detected.
2. An audible alarm sounded in the panel, and
3. An external audible alarm sounded in the building, location of
which shall be decided during detailed engineering.
4. If the zone comprises of more than one room, a visual signal shall
be exhibited on the outer wall of each room.

2.03.02 Each zone shall be provided with two zone cards in the panel so that
system will remain healthy even if one of the cards becomes defective.

2.03.03 Coverage area of each smoke detector shall not be more than 80 m 2
and that of heat detectors shall not be more than 40 m2. Ionisation type
smoke detectors shall be provided in all areas except pantry room
where heat detectors shall be provided. If a detector is concealed, a
remote visual indication of its operation shall be provided. Manual call
points (Break glass Alarm Stations) shall be provided at strategic
locations in the control room building. All cabling shall be done through
concealed conduits.

2.03.04 Cables used should be exclusively for fire detection and alarm system
and shall be 2Cx1.5sq.mm Cu. cables. Un-armoured PVC insulated FR
cables conforming to IS 1554 (Part 1) shall be used.

2.04.00 Portable and Wheel/ Trolley mounted Fire Extinguishers

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-5 of 56

C/ENGG/SPEC/FP Rev-6
2.04.01 Portable Fire Extinguishers

Adequate number of portable fire extinguishers of pressurised water, dry

chemical powder, and Carbon dioxide type shall be provided in suitable
locations in control room building and FFPH building as indicated in the
drawing. In addition to this one (1) CO2 type fire extinguisher of 4.5kg
capacity shall be provided for each Switchyard panel room. These
extinguishers will be used during the early phases of fire to prevent its
spread and costly damage.

The design, construction & testing of portable fire extinguishers shall

meet the requirements as per clause 10.00.00.

2.04.02 Wheel/ Trolley mounted Fire Extinguishers

Wheel/Trolley mounted Mechanical foam type fire extinguishers of

50litre capacity, conforming to IS:13386, shall be provided for the
protection of the following:

1. Transformers and reactors in 220kV and 132 kV substations where

Hydrant/HVWS system is not available. Two (2) nos. for each
220kV or 132kV transformer and reactor.

2. LT transformers in all substations. One (1) no. for each LT

transformer.

The design, construction & testing of Mechanical foam type 50 litre

capacity shall meet the requirements of relevant IS Codes and clause
10.00.00 of this specification.

2.05.00 Water Supply System

For 400kV and above level substations water for hydrant & HVW system
shall be supplied by one electrical motor driven pump of rated capacity
410m3/hr. at 70MWC head & for 220kV and 132kV substations water
for hydrant & HVWS system shall be supplied by one electrical
motor driven pump of rated capacity 273m3/hr. at 70MWC head,
with another pump of same capacity , driven by diesel engine, shall be
used as standby. Water storage tank with two compartments of
adequate capacity shall be provided. Pumps shall work under positive
suction head. Annunciations of the hydrant & HVW spray systems shall
be provided in fire water pump house and repeated in control room.
Provision for sending data to remote control centre shall also be
available.

The outdoor piping for the system in general shall be laid above ground
on concrete pedestals with proper supporting arrangement. However, at

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-6 of 56

C/ENGG/SPEC/FP Rev-6
 road/rail crossings, in front/access of buildings, places where movement
of cranes/vehicles is expected and at any other place where above
ground piping is not advisable, the pipes shall be laid underground.
Such locations shall be finalised during detailed engineering.

The whole system will be kept pressurised by providing combination of

air vessel and jockey pump of 10.8M3/hr. capacity at 80MWC. The
capacity of air vessel shall not be less than 3m 3. Minor leakage will be
met by Jockey pump. One additional jockey pump shall be provided as
standby. All pumps shall be of horizontal centrifugal type. Pumps and
air vessel with all auxiliary equipment will be located in firewater pump
house. A pressure relief valve of suitable rating shall be provided in
water header to release excess pressure due to atmospheric
temperature variations.

Operation of all the pumps shall be automatic and pumps shall be

brought into operation at preset pressure. Fire pumps shall only be
stopped manually. Manual start/stop provision shall be provided in local
control panel.

2.05.01 The general design of the fire fighting pump sets shall meet the
requirements under clauses no.5.00.00 for Horizontal centrifugal pumps,
no.6.00.00 for Diesel engines and no.12.00.00 for Electrical motors.

2.05.02 Each pump shall be provided with a nameplate indicating suction

lift/delivery head, capacity and number of revolutions per minute.

2.05.03 Design, construction, erection, testing and trial operation of piping,

valves, strainers, hydrant valves, hoses, nozzles, branch pipes, hose
boxes, expansion joints etc. shall conform to the requirements of clause
no. 7.00.00.

2.06.00 Instrumentation and Control System

2.06.01 All instruments like pressure indicators, differential pressure indicators,

pressure switches, level indicators, level switches, temperature
indicators, alarms and all other instruments and panels as indicated in
the specification and drawings and those needed for safe and efficient
operation of the whole system shall be furnished according to the
requirements of clause 11.00.00. Pump running/ fails to start signal shall
be taken from the pressure switch immediately after the discharge of the
pump.

2.06.02 Control Panel

Power feeder for motors will be from switchgear board located in control

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-7 of 56

C/ENGG/SPEC/FP Rev-6
 building but control supply for all local control panels, annunciation
panels, battery charger units, space heaters etc. shall be fed from the
AC and DC distribution boards located in pump house. These AC & DC
distribution boards will be fed from the switchgears and DCDBs located
in control building.

a) Panel for motor driven fire water pump

The panel shall be provided with the following:

1. TPN switch 1 No.

2. Auto/manual selection facility

3. Start/Stop facility 1 Set

with indication lamp

4. DOL starter with 1 Set

thermal O/L relay

5. Indicating lamp showing 1 Set

power ON

6. Indication lamp with drive 1 Set

ON/OF

7. Indication lamp showing 1 No.

Motor Trip

Additional provisions shall be made for controlling the following

from the remote control centre:

1. Auto/manual selection facility

2. Start/Stop facility

Main power cable from breaker feeder of main switchboard shall be

terminated in this panel and another cable shall emanate from this panel
which shall be terminated at motor terminals.

b) Panel for Two nos. Jockey Pump 1No.

The panel shall be provided with the following :

1. Fuse-switch unit for Jockey pumps 1 Set for each pump

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-8 of 56

C/ENGG/SPEC/FP Rev-6
 2. Auto/manual selection facility
for eachpump

3. Selector switch for 1 No.

selecting either jockey pump

4. D.O.L. starter with overload 1 No. each

relay self-resetting type,
for all the drives.

5. Start/stop push button for 1 Set for each pump

Jockey Pump with indication
lamp with pad-locking
arrangements in stop position

6. Indication lamp for trip 1 No. each for pump

indication

Additional provisions shall be made for controlling the following

from the remote control centre:

1. Auto/manual selection facility for each pump.

c) Panel for 2 Nos. battery charger 1 No.

& Diesel Engine driven fire water pump

The panel shall be provided with the following :

1. Auto/Manual selection facility for 1 No.

Diesel Engine driven pump

2. Start/Stop facility 1 Set

with indication lamp

3. Indicating lamp showing 1 Set

drive ON/OFF

4. D.C. Voltmeter/Ammeter in 1 No. each

the battery charger circuit

5. Battery charger will be as 1 Set

per specification described

6. Selector switch for selecting 1 No.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-9 of 56

C/ENGG/SPEC/FP Rev-6
 either of battery chargers
for the battery sets.

7. Selector switch for selecting 1No.

either set of batteries for
Diesel engine starting.

8. Selector switch for boost 1 Set

charging/Trickle charging
of battery set.

Additional provisions shall be made for controlling the following

from the remote control centre:

1. Manual Start/Stop of Diesel Engine

d) Individual local control panel is to be considered for each transformer/

Reactor deluge system wherever these equipment are envisaged. This
panel shall contain push buttons with indicating lamps for spray ON/OFF
operation in the valve operation circuit. Push buttons shall be concealed
behind glass covers, which shall be broken to operate the buttons.
Provision shall be made in the panel for the field signal for the
annunciations such as spray ON and fire in the Transformer/Reactor. A
signal for spray ON shall also be provided in the control room fire alarm
panel for employer’s event logger. Remote operation facility to open the
Deluge valve from control room/ remote centre shall also be provided.

2.06.03 Annunciation Panels

a) Location: Fire Water Pump House

i) Indicating lamps showing power supply "ON".

ii) Annunciation windows complete with buttons. Details are as follows:

_____________________________________________________
Sl.No. Description Number
____________________________________________________

1. Electric motor driven fire water pump running 1

2. Electric motor driven fire water pump fails 1

to start
3. Diesel engine driven fire water pump running. 1

4. Diesel engine driven water pump fails 1

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-10 of 56

C/ENGG/SPEC/FP Rev-6
 to start

5. Jockey pump-1 running 1

6. Jockey pump-1 fails to start 1

7. Jockey pump-2 running 1

8. Jockey pump-2 fails to start 1

9. Fire in Transformer/ Reactor 1 for each

equipment

10. Deluge system operating for 1 for each

Transformer/Reactor equipment

11. Header pressure low 1

12. Fire in smoke detection system zone 1

(Common Fire Signal)

13. Water storage tank water level low 2

14. High speed diesel tank level low 1

15. Spare 10

-----------------------------------------------------------------------------------------

b) Location: Substation Control Room

i) Indication lamp showing power supply 'ON'

ii) Provision shall be made in the panel for a signal for spray ON for each
Transformer/Reactor for owner's use for event logger.

iii) Each Switchyard panel room shall be considered as separate zone for fire
detection and alarm system.

iv) Following annunciations shall be provided.

-----------------------------------------------------------------------------------------
Sl.No. Description Number
-----------------------------------------------------------------------------------------

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-11 of 56

C/ENGG/SPEC/FP Rev-6
1. Fire in Transformer/ Reactor 1 for each equipment

2. Diesel engine driven fire water 1

pump in operation

3. Motor driven fire water pump in operation 1

4. Jockey pump in operation 1

5. Fire fighting Water storage tank level Low 2

6. Fire/Fault (zone alarm module) 1+1(duplicate) For each

zone as applicable

7. Spare windows complete in all 10

respect, with relays

8. Spare zone alarm modules Number of future A/c

Kiosks required for the
bays identified as per SLD
-----------------------------------------------------------------------------------------

c) Each annunciation panel shall be provided with a hooter. A hooter in

parallel to the hooter in fire panel shall be provided in the security
room of substation for alert in case of fire.

d) Indication for fault in respective areas shall also be provided. Each zone
alarm module shall exhibit 'FIRE’ and 'FAULT' conditions separately.

e) Provision for sending data to Remote Control Unit for the following

(i) Fire in Switchyard Panel Room (Switchyard Panel room shall be

considered as separate zone for fire detection and alarm
system).

(ii) Fire in Transformer/Reactor (1 for each equipment)

(iii) Diesel engine driven fire water pump in operation.

(iv) Motor driven fire water pump in operation

(v) Fire/Fault in Control Room.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-12 of 56

C/ENGG/SPEC/FP Rev-6
 (vi) Water Storage tank level (low and very low for each storage tank).

(vii) High Speed Diesel tank level (low & very low)

(viii) AC Mains Supply Healthy/Fail for Main Pump & Jockey Pump

(ix) DC Control Supply Healthy/Fail for Main Pump & Jockey Pump

(x) DC Control Supply Healthy/Fail for Diesel Engine driven pump.

2.06.04 The control and interlock system for the fire protection system shall
meet the following requirements:

1. Electric Motor Driven Fire water Pump

Pump should start automatically when the System header pressure

is low.

Pump should be stopped manually only. Pump should also be

started manually if required from local control panel.

2. Diesel Engine Driven Standby Pump

The pump should automatically start under any of the following

conditions:

a) System Header pressure low.

b) Electric motor operated fire water pump fails to start.

Pump should be stopped manually only. Pump should also be

started manually if required from the local control panel. The
battery set which is connected for starting of Diesel engine shall not
be subjected to boost charge.

3. Jockey Pump

It shall be possible to select any one of the Jockey pumps as main

and the other as standby. Main Jockey pump shall start
automatically when water pressure in header falls below the set
value. If the main jockey pump fails to start then the standby
should start. Jockey pump shall stop automatically when the
pressure is restored to its normal value.

Manual starting/stopping shall be possible from the local control

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-13 of 56

C/ENGG/SPEC/FP Rev-6
 panel.

3.00.00 TESTS

3.01.00 Shop Tests

3.01.01 Shop tests of all major equipment centrifugal pumps, diesel engines,
electrical drive motors, piping, valves and specialties, pressure and
storage vessels, MCC, electrical panels, controls, instrumentation etc.
shall be conducted as specified in various clauses and as per applicable
standards/codes.

3.01.02 Shop tests shall include all tests to be carried out at Contractor's works,
works of his sub-contractor and at works where raw materials supplied
for manufacture of equipment are fabricated. The tests to be carried out
shall include but not be limited to the tests described as follows :

a) Materials analysis and testing.

b) Hydrostatic pressure test of all pressure parts, piping, etc.

c) Dimensional and visual check.

d) Balancing test of rotating components.

e) Response of heat/smoke detectors.

f) Performance characteristics of HVW spray nozzles (projectors).

g) Flow rate and operational test on Flow control valves.

h) Operational test of alarm valve (water-motor gang).

i) Calibration tests on instruments and tests on control panel.

j) Destruction/burst tests on 2% or minimum one (1) no. of hoses

and portable type fire extinguishers for each type as applicable.
Any fraction number shall be counted as next higher integer.

k) Performance test on fire extinguishers as required in the code.

3.01.03 In the absence of any Code/Standard, equipment shall be tested as per

mutually agreed procedure between the supplier and the Employer.

3.01.04 A comprehensive visual and functional check for panels would be

conducted and will include a thorough check up of panel dimensions,

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-14 of 56

C/ENGG/SPEC/FP Rev-6
 material of construction, panel finish, compliance with tubing and wiring
specifications, quality of workmanship, proper tagging & locations of
instruments/accessories. The wiring check shall be complete point to
point ring out and check for agreement with installation drawings and
equipment vendor prints of the complete system and an inspection of all
field connection terminals and levelling.

3.01.05 All test certificates and reports shall be submitted to the Employer for
approval.

3.01.06 The Employer's representative shall be given full access to all tests.
The manufacturer shall inform the Employer allowing adequate time so
that, if the Employer so desires, his representatives can witness the test.

3.02.00 Pre-commissioning Tests

3.02.01 General

a) All piping and valves, after installation will be tested hydraulically at a

pressure of 16kg/cm2 for a period of 30 minutes to check against
leak tightness.

b) All manually operated valves/gates shall be operated throughout

100% of the travel and these should function without any trouble
whatsoever, to the satisfaction of the Employer.

c) All pumps shall be run with the specified fluid from shut off condition
to valve wide open condition. Head developed will be checked from
the discharge pressure gauge reading. During the test, the pumps
and drives shall run smoothly without any undue vibration, leakage
through gland, temperature rise in the bearing parts, noise, flow
pulsation etc.

d) All pressure vessels should be tested hydraulically at the specified

test pressure, singly or in the system.

e) Painting shall be checked by dry type thickness gauges.

f) Visual check on all structural components, welding, painting etc. and

if doubt arises, these will be tested again.

g) All test instruments and equipment shall be furnished by the

Contractor to the satisfaction of the Employer.

h) Automatic starting of all the fire pumps by operating the test valves.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-15 of 56

C/ENGG/SPEC/FP Rev-6
 i) Automatic operation of the Jockey pump

j) Operation of the Deluge valve by breaking a detector as well as

manual and remote operation of the deluge valve.

k) Operation of entire annunciation system.

Replacement of fused/damaged quartzoid bulb detectors during the test

shall be responsibility of contractor.

3.02.02 After erection at site, the complete HVW spray protection and hydrant
system shall be subject to tests to show satisfactory performance for
which detailed procedure shall be submitted for Employer's approval.

Full flow tests with water shall be done for the system piping as a means
of checking the nozzle layout, discharge pattern and coverage, any
obstructions and determination of relation between design criteria and
actual performance, also to ensure against clogging of the smaller
piping and the discharge devices by foreign matter carried by the water.

Rigidity of pipe supports shall also be checked during the water flow.

3.02.03 All the detectors installed shall be tested for actuation by bringing a
suitable source of heat/smoke near the detector and creating a stream
of hot air/ smoke over the detector. The exact procedure of this test
shall be detailed out by the Employer to the successful Bidder.

4.00.00 SPARE PARTS

The Contractor shall indicate in his scope of supply all the mandatory
spares in the relevant schedules. The list of mandatory spares is
indicated in ‘Section - Projects’.

5.00.00 HORIZONTAL CENTRIFUGAL PUMPS

This clause covers the design, performance, manufacturing,

construction features and testing of horizontal centrifugal pumps used
for the purpose of fire fighting.

5.01.00 The materials of the various components shall conform to the applicable
IS/BS/ASTM/DIN Standards.

5.01.01 In case of any contradiction with the aforesaid standards and the
stipulations as per the technical specification as specified hereinafter,
the stipulations of the technical specification shall prevail.

5.02.00 General Performance Requirements

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-16 of 56

C/ENGG/SPEC/FP Rev-6
5.02.01 The pump set shall be suitable for continuous operation at any point
within the "Range of operation".

5.02.02 Pumps shall have a continuously rising head capacity characteristics

from the specified duty point towards shut off point, the maximum being
at shut off.

5.02.03 Pumps shall be capable of furnishing not less than 150% of rated
capacity at a head of not less than 65% of the rated head. The shut off
head shall not exceed 120% of rated head. Range of operation shall be
20% of rated flow to 150% of rated flow.

5.02.04 The pump-motor set shall be designed in such a way that there is no
damage due to the reverse flow through the pump which may occur due
to any mal-operation of the system.

5.02.05 Drive Rating

The drive rating shall not be less than the maximum power requirement
at any point within the "Range of Operation" specified.

During starting under reverse flow condition, the motor shall be capable
of bringing the pump to rated speed at normal direction with 90% rated
voltage at motor terminals.

5.02.06 Pump set along with its drive shall run smooth without undue noise and
vibration. Acceptable peak to peak vibration limits shall generally be
guided by Hydraulic Institute Standards.

5.02.07 The Contractor under this specification shall assume full responsibility in
the operation of the pump and drive as one unit.

5.03.00 Design & Construction

5.03.01 Pump casing may be axially or radially split. The casing shall be
designed to withstand the maximum pressure developed by the pump at
the pumping temperature.

5.03.02 Pump casing shall be provided with adequate number of vent and
priming connections with valves, unless the pump is made self-venting &
priming. Casing drain, as required, shall be provided complete with
drain valves.

5.03.03 Under certain conditions, the pump casing nozzles will be subjected to
reactions from external piping. Pump design must ensure that the
nozzles are capable of withstanding external reactions not less than
those specified in API-610.

5.03.04 Pump shall preferably be of such construction that it is possible to

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-17 of 56

C/ENGG/SPEC/FP Rev-6
 service the internals of the pump without disturbing suction and
discharge piping connections.

5.03.05 Impeller

The impeller shall be secured to the shaft and shall be retained against
circumferential movement by keying, pinning or lock rings. On pumps
with overhung shaft impellers shall be secured to the shaft by an
additional locknut or cap screw. All screwed fasteners shall tighten in
the direction of normal rotation.

5.03.06 Wearing Rings

Replaceable type wearing rings shall be furnished to prevent damage to

impeller and casing. Suitable method of locking the wearing ring shall
be used.

5.03.07 Shaft

Shaft size selected shall take into consideration the critical speed, which
shall be at least 20% away from the operating speed. The critical speed
shall also be atleast 10% away from runaway speed.

5.03.08 Shaft Sleeves

Renewable type fine finished shaft sleeves shall be provided at the

stuffing boxes/mechanical seals. Length of the shaft sleeves must
extend beyond the outer faces of gland packing or seal and plate so as
to distinguish between the leakage between shaft & shaft sleeve and
that past the seals/gland.

5.03.09 Shaft sleeves shall be securely fastened to the shaft to prevent any
leakage or loosening. Shaft and shaft sleeve assembly should ensure
concentric rotation.

5.03.10 Bearings

Bearings of adequate design shall be furnished for taking the entire

pump load arising from all probable conditions of continuous operation
throughout its "Range of Operation" and also at the shut-off condition.
The bearing shall be designed on the basis of 20,000 working hours
minimum for the load corresponding to the duty point.

Bearings shall be easily accessible without disturbing the pump

assembly. A drain plug shall be provided at the bottom of each bearing
housing.

5.03.11 Stuffing Boxes

Stuffing box design shall permit replacement of packing without

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-18 of 56

C/ENGG/SPEC/FP Rev-6
 removing any part other than the gland. Stuffing boxes shall be
sealed/cooled by the fluid being pumped and necessary piping, fittings,
valves, instruments, etc. shall form an integral part of the pump
assembly.

5.03.12 Shaft Couplings

All shafts shall be connected with adequately sized flexible couplings of

suitable design. Necessary guards shall be provided for the couplings.

5.03.13 Base Plates & Sole Plate

A common base plate mounting both for the pump and drive shall be
furnished.

The base plate shall be of rigid construction, suitably ribbed and

reinforced. Base plate and pump supports shall be so constructed and
the pumping unit so mounted as to minimise misalignment caused by
mechanical forces such as normal piping strain, hydraulic piping thrust
etc. Suitable drain taps and drip lip shall be provided.

5.03.14 Material of Construction

All materials used for pump construction shall be of tested quality.

Material of construction of the major parts of the pumps shall be as
given below :

a) Casing Casting Grade FG: 260 of IS 210

b) Impeller Bronze Grade LTB 2 of IS:318

c) Wearing ring Bronze Grade LTB 2 of IS:318

d) Shaft Grade 40C8 of IS 1570

(Part 2, section 1.): 1979.

e) Shaft sleeve Bronze Grade LTB 2 of IS:318 or

Chrome steel 07Cr13 of
IS 1570 (part 5) :1985.

f) Stuffing box 2.5% Nickel CI Grade FG 260 of

IS:210

g) Gland --- do ---

5.03.15 Balancing

All rotating components shall be statically and dynamically balanced at

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-19 of 56

C/ENGG/SPEC/FP Rev-6
 shop.

5.03.16 All the components of pumps of identical parameters supplied under this
specification shall be interchangeable.

5.04.00 Tests and Inspection

5.04.01 The manufacturer shall conduct all routine tests required to ensure that
the equipment furnished conform to the requirements of this
specification and are in compliance with the requirements of applicable
Codes and Standards. The particulars of the proposed tests and the
procedures for the tests shall be submitted to the Employer/Engineer for
approval before conducting the tests.

5.04.02 Where stage inspection is to be witnessed by Employer, in addition to

above, the Bidder shall submit to the Employer/Engineer at the
beginning of the contract, the detailed PERT-Chart showing the
manufacturing programme and indicating the period where Employer or
his authorised inspecting agency are required at the shop.

5.04.03 Material of Construction

All materials used for pump construction shall be of tested quality.

Materials shall be tested as per the relevant standards and test
certificates shall be made available to the Employer/Engineer.

5.04.04 Where stage inspection is to be witnessed by Employer, all material test

certificates shall be correlated and verified with the actual material used
for construction before starting fabrication, by Employer's Inspector who
shall stamp the material. In case mill test certificates for the material are
not available, the Contractor shall carry out physical and chemical tests
at his own cost from a testing agency approved by the Employer, as per
the requirements of specified material standard. The samples for
physical and chemical tests shall be drawn up in presence of Employer's
inspector who shall also witness the tests.

5.04.05 Shaft shall be subjected to 100% ultrasonic test and machined portion of
the impeller shall be subject to 100% DP test. On finished shaft DP test
will also be carried out.

5.04.06 Hydraulic test at shop

All pressure parts shall be subjected to hydraulic testing at a pressure of

150% of maximum pressure generated by the pump at rated speed or
200% of total dynamic head whichever is higher, for a period not less
than one (1) hour.

5.04.07 Performance test at shop

Pumps shall be subjected to routine tests to determine the performance

of the pumps. These tests shall be conducted in presence of

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-20 of 56

C/ENGG/SPEC/FP Rev-6
 Employer/Engineer's representative as per the requirements of the
Hydraulic Institute Standards/ASME Power Test Code PTC 8.2/BS-
599/I.S.S., latest edition. Routine tests shall be done on all the pumps.

5.04.08 Performance tests shall be conducted to cover the entire range of

operation of the pumps. These shall be carried out to span 150% of
rated capacity upto pump shut-off condition. A minimum of five
combinations of head and capacity are to be achieved during testing to
establish the performance curves, including the design capacity point
and the two extremities of the Range of operation specified.

5.04.09 Tests shall preferably be conducted alongwith the actual drives being
supplied.

5.04.10 The Bidders shall submit in his proposal the facilities available at his
works to conduct performance testing. If because of limitations of
available facilities, a reduced speed test or model test has to be resorted
to establish pump performance, the same has to be highlighted in the
offer.

5.04.11 In case of model testing, the stipulations of latest edition of Hydraulic

Institute Standards shall be binding. Prototype or model tests, however,
shall be conducted with the suction condition identical to the field
conditions i.e. sigma values of prototype and model is to be kept same.

5.04.12 Prior to conducting model testing, calculations establishing model

parameters, sizes and test procedure will be submitted to
Employer/Engineer for approval.

5.04.13 All rotating components of the pumps shall be subjected to static and
dynamic balancing tests.

5.04.14 The Employer or his authorised representative shall have full access to
all tests. Prior to performance tests, the Contractor shall intimate the
Employer allowing adequate time so that if the Employer so desires, his
representative can witness the test.

5.04.15 Report and test certificates of the above tests shall be submitted to the
Employer/Engineer for approval.

5.04.16 Pre commissioning tests.

After installation, pumps offered may be subjected to testing at field also

by Employer. If the performances at field are not found to meet the
requirement, then the equipment shall be rectified by the Contractor
without any extra cost. Prior to performance testing, the procedure for
such tests will be mutually agreed between Employer and Contractor.
The Contractor shall furnish all necessary instruments, accessories and
personnel for testing. Prior to testing, the calibration curves of all
instruments and permissible tolerance limit of instruments shall be
mutually agreed upon.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-21 of 56

C/ENGG/SPEC/FP Rev-6
6.00.00 DIESEL ENGINES

This Clause covers the design, performance, manufacturing

construction features and testing of compression ignition diesel engines,
used primarily for driving centrifugal pumps, used for the purpose of fire
fighting.

6.01.00 Design and Construction

General

6.01.01 The diesel engine shall be of multicylinder type four-stroke cycle with
mechanical (airless) injection, cold starting type.

6.01.02 The continuous engine brake horse power rating (after accounting for all
auxiliary power consumption) at the site conditions shall be atleast 20%
greater than the requirement at the duty point of pump at rated RPM and
in no case, less than the maximum power requirement at any condition
of operation of pump.

6.01.03 Reference conditions for rated output of engine shall be as per

IS:10000, part II or ISO:3046, part I.

6.01.04 The engine shall be designed with regard to ease of maintenance,

repair, cleaning and inspection.

6.01.05 All parts subjected to substantial temperature changes shall be

designed and supported to permit free expansion and contraction
without resulting in leakage, harmful distortion or misalignment.

6.01.06 Starting

The engine shall be capable of both automatic and manual start. The
normal mode of starting is automatic but in the event of failure of
automatic start or at the discretion of the operator, the engine can be
started manually from the LCP.

Since the fire pumping unit driven by the diesel engine is not required to
run continuously for long periods and the operation will not be frequent,
special features shall be built into the engine to allow it to start within a
very short period against full load even if it has remained idle for a
considerable period.

6.01.07 If provision for manual start (cranking) is provided, all controls/

mechanisms, which have to be operated during the starting process,
shall be within easy reach of the operator.

6.01.08 Automatic cranking shall be effected by a D.C. motor having high

starting torque to overcome full engine compression. Starting power will

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-22 of 56

C/ENGG/SPEC/FP Rev-6
 be supplied from either of the two (2) sets of storage batteries. The
automatic starting arrangement shall include a 'Repeat Start' feature for
3 attempts. The battery capacity shall be adequate for 3 (three)
consecutive starts without recharging with a cold engine under full
compression.

6.01.09 The batteries shall be used exclusively for starting the diesel engine and
be kept fully charged all the time in position. Arrangement for both
trickle and booster charge shall be provided.

Diesel engine shall be provided with two (2) battery charger units of air-
cooled design. The charger unit shall be capable of charging one (1) set
of battery at a time. Provision shall, however, be made so that any one
of the charger units can be utilised for charging either of the two (2)
batteries.

6.01.10 For detail design of battery and battery charger, sub- section Electrical
may be referred to.

6.01.11 Governing System:

The engine shall be fitted with a speed control device, which will control
the speed under all conditions of load.

6.01.12 The governor shall offer following features:

a) Engine should be provided with an adjustable governor capable

of regulating engine speed within 5% of its rated speed under any
condition of load between shut-off and maximum load conditions
of the pumps. The governor shall be set to maintain rated pump
speed at maximum pump load.

b) Engine shall be provided with an over speed shut- down device.

It shall be arranged to shut-down the engine at a speed
approximately 20% above rated engine speed and for manual
reset, such that the automatic engine controller will continue to
show an over speed signal until the device is manually reset to
normal operating position (Vol.II, NFPA, 1978).

6.01.13 The governor shall be suitable for operation without external power
supply.

6.01.14 Fuel System

The diesel engine will run on High Speed Diesel.

6.01.15 The engine shall be provided with fuel oil tank of 250 litres capacity.
The fuel oil tank shall preferably be mounted near the engine. No fuel
oil tank will be provided by the Employer.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-23 of 56

C/ENGG/SPEC/FP Rev-6
6.01.16 The fuel oil tank shall be of welded steel constructed to relevant
standards for mild steel drums. The outlet of the tank shall be above the
inlet of fuel injection pump of the diesel engine to ensure adequate
pressure at suction of injection pump.

6.01.17 The fuel oil tank shall be designed in such a way that the sludge and
sediment settles down to the tank bottom and is not carried to the
injection pump. A small sump shall be provided and fitted with drain
plug to take out sludge/sediment and to drain oil. Adequate hand holes
(greater than 80 mm size) shall be provided to facilitate maintenance.

6.01.18 Pipeline carrying fuel oil shall be gradually sloped from the tank to the
injection pump. Any valve in the fuel feed pipe between the fuel tank
and the engine shall be placed adjacent to the tank and it shall be
locked in the open position. A filter shall be incorporated in this pipeline,
in addition to other filters in the fuel oil system. Pipe joints shall not be
soldered and plastic tubing shall not be used. Reinforced flexible pipes
may also be used.

6.01.19 The complete fuel oil system shall be designed to avoid any air pocket in
any part of the pipe work, fuel pump, sprayers/injectors, filter system etc.
No air relief cock is permitted. However, where air relief is essential,
plugs may be used.

6.01.20 A manual fuel pump shall be provided for priming and releasing of air
from the fuel pipelines.

6.01.21 Lubricating Oil System

Automatic pressure lubrication shall be provided by a pump driven by

the crank shaft, taking suction from a sump and delivering pressurised
oil through cooler and fine mesh filters to a main supply header fitted in
the bed plate casing. High pressure oil shall be supplied to the main
and big end bearings, cam-shaft bearings, cam-shaft chain and gear
drives, governor, auxiliary drive gears etc. Valve gear shall be
lubricated at reduced pressure through a reducing valve and the cams
by an oil bath.

6.01.22 Cooling Water System

Direct cooling or heat exchanger type cooling system shall be employed

for the diesel engine. Water shall be tapped from the fire pump
discharge. This water shall be led through duplex strainer, pressure
breakdown orifice and then after passing through the engine, the water
at the outlet shall be taken directly to the sump through an elevated
funnel.

6.02.00 Testing & Inspection

6.02.01 The manufacturer shall conduct all tests required, to ensure that the
equipment furnished conforms to the requirement of this sub-section

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-24 of 56

C/ENGG/SPEC/FP Rev-6
 and in compliance with requirements of applicable codes. The
particulars of the proposed tests and the procedure for the tests shall be
submitted to the Employer for approval before conducting the tests.

6.02.02 At manufacturer's works, tests shall be carried out during and after
completion of manufacture of different component/parts and the
assembly as applicable. Following tests shall be conducted.

6.02.03 Material analysis and testing.

6.02.04 Hydrostatic pressure testing of all pressure parts.

6.02.05 Static and dynamic balance tests of rotating parts at applicable over-
speed and determination of vibration level.

6.02.06 MPI/DPT on machined parts of piston and cylinder.

6.02.07 Ultrasonic testing of crankshaft and connecting rod after heat treatment.

6.02.08 Dimensional check of close tolerance components like piston, cylinder

bore etc.

6.02.09 Calibration tests of all fuel pumps, injectors, standard orifices, nozzles,
instruments etc.

6.02.10 Over speed test of the assembly at 120% of rated speed.

6.02.11 Power run test.

6.02.12 Performance test of the diesel engine to determine its torque, power and
specific fuel consumption as function of shaft speed. Performance test
of the engine shall be carried for 12 hours out of which 1 hour at full load
and one hour at 110% overload.

6.02.13 Measurement of vibration & noise.

(i) Measurement of vibration

The vibration shall be measured during full load test as well as during
the overload test and limit shall be 100 microns.

(ii) Measurement of noise level

The equivalent 'A' weighted sound level measured at a distance of 1.5 M

above floor level in elevation and 1.0 M horizontally from the base of the
equipment, expressed in dB to a reference of 0.0002 microbar shall not
exceed 93 dBA.

Above tests for vibration shall be repeated at site as pre-commissioning

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-25 of 56

C/ENGG/SPEC/FP Rev-6
 tests.

6.02.14 Adjustment of speed governor as per BS:5514.

6.02.15 Diesel engine shall be subjected to routine tests as per

IS:10000/BS:5514.

7.00.00 PIPING, VALVES AND SPECIALITIES

This clause covers the design, manufacture, shop testing, erection, test-
ing and commissioning of piping, valves and specialities.

7.02.00 Scope

The piping system which shall include but not be limited to the following:

7.02.01 Plain run of piping, bends, elbows, tees, branches, laterals, crosses,
reducing unions, couplings, caps, expansion joints, flanges, blank
flanges, thrust blocks, anchors, hangers, supports, saddles, shoes,
vibration dampeners, sampling connections, hume pipes etc.

7.02.02 Gaskets, ring joints, backing rings, jointing material etc. as required.
Also all welding electrodes and welding consumables including special
ones, if any.

7.02.03 Instrument tapping connections, stubs etc.

7.02.04 Gate and globe valves to start/stop and regulate flow and swing check
valves for one directional flow.

7.02.05 Basket strainers and Y-type strainers

7.02.06 Bolts, nuts, fasteners as required for interconnecting piping, valves and
fittings as well as for terminal points. For pipe connections into Owner's
R.C.C. works, Bidder will furnish all inserts.

7.02.07 Painting, anti-corrosive coatings etc. of pipes and equipment.

Adequate number of air release valves shall be provided at the highest

points in the piping system to vent any trapped air in the system.

7.03.00 Design

7.03.01 Material of construction of various pipes shall be as follows :

(a) Buried Pipes

Mild steel black pipes as per IS:1239, Part-I medium grade (for
pipes of sizes 150 NB and below) or IS:3589, Fe 410 grade (for
pipes of sizes 200 NB and above) suitably lagged on the outside to

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-26 of 56

C/ENGG/SPEC/FP Rev-6
 prevent soil corrosion, as specified elsewhere.

(b) Overground Pipes normally full of water

Mild steel black pipes as per IS:1239, Part-I medium grade (for
pipes for sizes 150 NB and below) or IS:3589, Fe 410 grade (for
pipes of sizes 200 NB and above).

(c) Overground pipes normally empty, but periodic charge of water and
for detector line for HVW System.

Mild steel galvanised pipes as per IS:1239, Part-I medium grade (for
pipes of sizes 150 NB and below) or IS:3589, Fe 410 grade (for pipes of
sizes 200 NB and above).

7.03.02 All fittings to be used in connection with steel pipe lines upto a size of 80
mm shall be as per IS:1239. Part-II Mild steel tubulars and other
wrought steel pipe fittings, Heavy grade. Fittings with sizes above 80
mm upto 150 mm shall be fabricated from IS:1239 Heavy grade pipes or
steel plates having thickness not less than those of IS:1239 Part-I Heavy
grade pipes. Fittings with sizes above 150 mm shall be fabricated from
IS:3589 Class-2 pipes. All fitting used in GI piping shall be threaded
type. Welding shall not be permitted on GI piping.

7.03.03 Pipe sizes shall not be less than the sizes indicated in the attached
drawings.

7.03.04 For steel pipeline, welded construction should be adopted unless

specified otherwise.

7.03.06 All piping system shall be capable of withstanding the maximum

pressure arising from any condition of operation and testing including
water hammer effects.

7.03.09 Gate/sluice valve shall be used for isolation of flow in pipe lines and
construction shall be as per IS:778 (for size up to 40 mm) and
IS:14846 (for sizes above 40 mm) except for valve spindle movement.
Valves shall be of rising spindle type and of PN 1.6 class

7.03.10 Gate Valves shall be provided with the following :

(a) Hand wheel.

(b) Position indicator.

(c) Locking facility (where necessary).

7.03.11 Gate valves shall be provided with back seating bush to facilitate gland
removal during full open condition.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-27 of 56

C/ENGG/SPEC/FP Rev-6
7.03.12 Globe valves shall be provided with contoured plug to facilitate
regulation and control of flow. All other requirements should generally
follow those of gate valve.

7.03.13 Non-return valves shall be swing check type. Valves will have a
permanent "arrow" inscription on its body to indicate direction of flow of
the fluid. These valves shall generally conform to IS:5312.

7.03.14 Whenever any valve is found to be so located that it cannot be

approached manually from the nearest floor/gallery/platform hand wheel
with floor stand or chain operator shall be provided for the same.

7.03.15 Valves below 50 mm size shall have screwed ends while those of 50
mm and higher sizes shall have flanged connections.

7.03.14 Basket Strainer

a) Basket strainers shall be of 30mesh and have the following

materials of construction :

Body: Fabricated mild steel as per IS:2062 (Tested Quality).

Strainer Wires: stainless steel (AISI : 316), 30 SWG, suitably
reinforced.

b) Inside of basket body shall be protected by two (2) coats of heavy

duty bitumastic paint.

c) Strainers shall be Simplex design. Suitable vent and drain

connections with valves shall be provided.

d) Screen open area shall be at least 4 times pipe cross sectional area
at inlet.

e) Pressure drop across strainer in clean condition shall not exceed

1.5 MWC at 410M3/hr (for 765kV/400kV substations) and 1 MWC
at 273M3/hr flow (for 220kV & 132kV substations). Pressure drop
test report of strainer of same design shall be furnished.

7.03.15 Y-type On-line Strainer

Body shall be constructed of mild steel as per IS:2062 (tested quality).

Strainer wires shall be of stainless steel AISI:316, 30 SWG, 30 mesh.

Blowing arrangement shall be provided with removable plug at the

outlet. Screen open area shall be atleast 4 times pipe cross-sectional
area at inlet.

Pressure drop test report of strainer of same design shall be furnished.

7.03.16 Hydrant Valve (Outdoor) and Indoor Hydrant Valves (Internal

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-28 of 56

C/ENGG/SPEC/FP Rev-6
 Landing Valves).

The general arrangement of outdoor stand post assembly, consisting of

a column pipe and a hydrant valve with a quick coupling end shall be as
per TAC requirement.

Materials of construction shall be as follows :

a) Column pipe M.S. IS:1239 med. grade.

b) Hydrant Valve

i) Body Stainless steel.

ii) Trim Leaded tin bronze as per IS:318,

Grade-LTB 2.

iii) Hand Wheel Cast Iron as per IS:210,

Grade FG:200.

iv) Washer, gasket, etc. Rubber as per IS:638.

v) Quick coupling Leaded tin bronze as per

connection IS:318, Grade-LTB 2.

vi) Spring Phosphor Bronze as per IS:7608.

vii) Cap and chain Leaded tin bronze as per IS:318,

Grade-LTB etc.2.

The general design of hydrant valve shall conform to IS:5290.

7.03.17 Hoses, Nozzles, Branch pipes and Hose boxes

(a) Hose pipes shall be of reinforced rubber-lined canvas construction

as per type A of IS:636 with nominal size of 63 MM (2 1/2") and
lengths of 15 metre or 7.5 metre, as indicated elsewhere. All hoses
shall be ISI marked.

(b) Hosepipes shall be capable of withstanding an internal water

pressure of not less than 35.7 kg/cm2 without bursting. It must also
withstand a working pressure of 8.5 kg/cm 2 without undue leakage
or sweating.

(c) Each hose shall be fitted with instantaneous spring lock type
couplings at both ends. Hose shall be fixed to the coupling ends by
copper rivets and the joint shall be reinforced by 1.5 mm galvanised
mild steel wires and leather bands.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-29 of 56

C/ENGG/SPEC/FP Rev-6
 (d) Branch pipes shall be constructed of copper and have rings of
leaded tin bronze (as per IS:318 Grade-2) at both ends. One end of
the branch pipe will receive the quick coupling while the nozzles will
be fixed to the other end.

(e) Nozzles shall be constructed of leaded tin bronze as per IS:318,

Grade-2.

(f) Suitable spanners of approved design shall be provided in adequate

numbers for easy assembly and dismantling of various components
like branch pipes, nozzles, quick coupling ends etc.

(g) Hose pipes fitted with quick coupling ends, branch pipes, nozzles
spanner etc. will be kept in a hose box, which will be located near
point of use. The furnished design must meet the approval of Tariff
Advisory Committee.

(h) All instantaneous couplings, as mentioned under clause

Nos.3.03.19, 3.03.20 and 3.03.21 above shall be of identical design
(both male and female) so that any one can be interchanged with
another. One male, female combination shall get locked in by mere
pushing of the two halves together but will provide leak tightness at
a pressure of 8 kg/cm2 of water. Designs employing screwing or
turning to have engagement shall not be accepted.

7.04.00 Fabrication & Erection

7.04.01 The contractor shall fabricate all the pipe work strictly in accordance with
the related approved drawings.

7.04.02 End Preparation

(a) For steel pipes, end preparation for butt welding shall be done by
machining.

(b) Socket weld end preparation shall be sawing/machining.

(c) For tees, laterals, mitre bends, and other irregular details cutting
templates shall be used for accurate cut.

7.04.03 Pipe Joints

(a) In general, pipes having sizes over 25 mm shall be joined by butt

welding. Pipes having 25 mm size or less shall be joined by socket
welding/screwed connections. Galvanised pipes of all sizes shall
have screwed joints. No welding shall be permitted on GI pipes.
Screwed joints shall have tapered threads and shall be assured of
leak tightness without using any sealing compound.

(b) Flanged joints shall be used for connections to vessels, equipment,

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-30 of 56

C/ENGG/SPEC/FP Rev-6
 flanged valves and also on suitable straight lengths of pipe line of
strategic points to facilitate erection and subsequent maintenance
work.

7.04.04 Overground Piping

(a) Piping to be laid overground shall be supported on pipe

rack/supports. Rack/supports details shall have to be approved by
Employer/Engineer.

(b) Surface of overground pipes shall be thoroughly cleaned of mill

scale, rust etc. by wire brushing. Thereafter one (1) coat of red
oxide primer shall be applied. Finally two (2) coats of synthetic
enamel paint of approved colour shall be applied.

7.04.05 Buried Pipe Lines

(a) Pipes to be buried underground shall be provided with protection

against soil corrosion by coating and wrapping with two coats of
coal tar hot enamel paint and two wraps of reinforced fibre glass
tissue. The total thickness of coating and wrapping shall not be less
than 3 mm. Alternatively corrosion resistant tapes can also be used
for protection of pipes against corrosion.

(b) Coating and wrapping and holiday testing shall be in line with
IS:10221.

(c) Buried pipelines shall be laid with the top of pipe one meter below
ground level.

(d) At site, during erection, all coated and wrapped pipes shall be
tested with an approved Holiday detector equipment with a positive
signalling device to indicate any fault hole breaks or conductive
particle in the protective coating.

7.05.00 General Instruction for Piping Design and Construction

7.05.01 While erecting field run pipes, the contractor shall check, the
accessibility of valves, instrument tapping points, and maintain minimum
headroom requirement and other necessary clearance from the
adjoining work areas.

7.05.02 Modification of prefabricated pipes, if any, shall have to be carried out by

the contractor at no extra charge to the Employer.

7.05.03 Welding

(i) Welding shall be done by qualified welders only.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-31 of 56

C/ENGG/SPEC/FP Rev-6
 (ii) Before welding, the ends shall be cleaned by wire brushing, filing
or machine grinding. Each weld-run shall be cleaned of slag
before the next run is deposited.

(iii) Welding at any joint shall be completed uninterrupted. If this

cannot be followed for some reason, the weld shall be insulated for
slow and uniform cooling.

(iv) Welding shall be done by manual oxyacetylene or manual shielded

metal arc process. Automatic or semi-automatic welding
processes may be done only with the specific approval of
Employer/ Consultant.

(v) As far as possible welding shall be carried out in flat position. If not
possible, welding shall be done in a position as close to flat
position as possible.

(vi) No backing ring shall be used for circumferential butt welds.

(vii) Welding carried out in ambient temperature of 5°C or below shall

be heat-treated.

(viii) Tack welding for the alignment of pipe joints shall be done only by
qualified welders. Since tack welds form part of final welding, they
shall be executed carefully and shall be free from defects.
Defective welds shall be removed prior to the welding of joints.

Electrodes size for tack welding shall be selected depending upon

the root opening.

(ix) Tacks should be equally spaced as follows :

for 65 NB and smaller pipes : 2 tacks

for 80 NB to 300 NB pipes : 4 tacks

for 350 NB and larger pipes : 6 tacks

(x) Root run shall be made with respective electrodes/filler wires. The
size of the electrodes/filler wires. The size of the electrodes shall
not be greater than 3.25 mm (10 SWG) and should preferably be
2.3 mm (12 SWG). Welding shall be done with direct current
values recommended by the electrode manufacturers.

(xi) Upward technique shall be adopted for welding pipes in

horizontally fixed position. For pipes with wall thickness less than 3
mm, oxyacetylene welding is recommended.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-32 of 56

C/ENGG/SPEC/FP Rev-6
 (xii) The root run of butt joints shall be such as to achieve full
penetration with the complete fusion of root edges. The weld
projection shall not exceed 3 mm inside the pipe.

(xiii) On completion of each run craters, weld irregularities, slag etc.

shall be removed by grinding or chipping.

(xiv) Fillet welds shall be made by shielded metal arc process

regardless of thickness and class of piping. Electrode size shall not
exceed 10 SWG. (3.25 mm). At least two runs shall be made on
socket weld joints.

7.06.00 Tests at Works

7.06.01 Pipes

(i) Mechanical and chemical tests shall be performed as required in

the codes/standards.

(ii) All pipes shall be subjected to hydrostatic tests as required in the

codes/standards.

(iii) 10% spot Radiography test on welds of buried pipes shall be

carried out as per ASME VIII.

7.06.02 Valves

(i) Mechanical and chemical tests shall be conducted on materials of

the valve as required in the codes/standards.

(ii) All valves shall be tested hydrostatically for the seat as well as
required in the code/standards for a period of ten minutes.

(iii) Air test shall be conducted to detect seat leakage.

(iv) Visual check on the valve and simple operational test in which the
valve will be operated thrice from full open to full close condition.

(v) No repair work on CI valve body, bonnet or wedge shall be

allowed.

7.06.03 Strainers

(i) Mechanical and chemical tests shall be conducted on materials of

the strainer.

(ii) Strainers shall be subjected to a hydrostatic test pressure of 1.5

times the design pressure or 10 kg/cm 2g whichever is higher for a
period of one hour.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-33 of 56

C/ENGG/SPEC/FP Rev-6
7.06.04 Hydrant valves and Indoor Hydrant Valves (Internal Landing
Valves)

(i) The stand post assembly along with the hydrant valve (valve being
open and outlet closed) shall be pressure tested at a hydrostatic
pressure of 21 kg/cm2g to detect any leakage through defects of
casting.

(ii) Flow test shall be conducted on the hydrant valves at a pressure of

7 kg/cm2g and the flow through the valve shall not be less than
900 litres/min.

(iii) Leak tightness test of the valve seat shall be conducted at a

hydrostatic test pressure of 14 kg/cm2g.

7.06.05 Hoses, Nozzles, Branch Pipes and Hose Boxes

Reinforced rubber-lined canvas hoses shall be tested hydrostatically.

Following tests shall be included as per IS:636.

a) Hydrostatic proof pressure test at 21.4 kgf/cm2g

b) Internal diameter

The branch pipe, coupling and nozzles shall be subjected to a

hydrostatic test pressure of 21 kg/cm2g for a period of 21/2 minutes and
shall not show any sign of leakage or sweating.

Dimensional checks shall be made on the hose boxes and nozzle

spanners.

8.00.00 AIR VESSELS

8.01.00 Air vessels shall be designed and fabricated of mild steel as class-II
vessels as per IS:2825 for a pressure of 14kg/cm2 and shall be minimum
3 m3 capacity.

8.02.00 Inside surface of the tank shall be protected by anti-corrosive

paints/coatings/linings as required.

8.03.00 Outside surfaces of the vessels shall be provided with one (1) coat of
red lead primer with two (2) coats of synthetic enamel paint of approved
colour and characteristics.

8.04.00 Tests & Inspection

8.04.01 Air vessels shall be hydraulically tested at 21kg/cm2 for a period not
less than one (1) hour.

8.04.02 All materials used for fabrication shall be of tested quality and test

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-34 of 56

C/ENGG/SPEC/FP Rev-6
 certificates shall be made available to the Owner.

8.04.03 Welding procedure and Welder's qualification tests will be carried out as
per relevant IS Standard.

8.04.04 NDE tests, which will include 100% Radiography on longitudinal seams
and spot Radiography for circumferential seams, for pressure vessel will
be carried out.

9.00.00 HEAT DETECTORS/FIRE DETECTORS AND SPRAY NOZZLES

9.00.01 Intent of Specification

This specification lays down the requirements of the smoke detectors,

heat detectors and spray nozzles for use in various sub-systems of the
fire protection system.

9.00.02 Codes and Standards

All equipment supplied shall conform to internationally accepted codes

and standards. All equipment offered by Bidders should be TAC
approved or have been in use in installations which have been approved
by TAC.

9.01.00 Heat Detectors, Quartzoid bulb type. (Used in HVW spray system)

a) Heat detectors shall be of any approved and tested type. Fusible

chemical pellet type heat detectors are however not acceptable.

b) Temperature rating of the heat detector shall be selected by the

Bidder taking into consideration the environment in which the
detectors shall operate. Minimum set point shall, however, be
79oC.

c) Heat detectors shall be guaranteed to function properly without any

maintenance work for a period of not less than twenty five (25)
years.

d) The heat detectors shall be mounted on a pipe network charged

with water at suitable pressure. On receipt of heat from fire, the
heat detector will release the water pressure from the network. This
drop in water pressure will actuate the Deluge valve.

9.02.00 HVW Spray Nozzles (Projectors)

High velocity water spray system shall be designed and installed to

discharge water in the form of a conical spray consisting of droplets of
water travelling at high velocity which shall strike the burning surface
with sufficient impact to ensure the formation of an emulsion. At the
same time the spray shall efficiently cut off oxygen supply and provide

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-35 of 56

C/ENGG/SPEC/FP Rev-6
 sufficient cooling. Integral non-ferrous strainers shall be provided in the
projectors ahead of the orifice to arrest higher size particle, which are
not allowed to pass through the projectors.

9.03.00 Fire Detectors (Used in fire detection and alarm system)

9.03.01 Fire detectors shall be approved by FOC-London or similar international

authorities.

9.03.02 Both smoke and heat type fire detectors shall be used. Bidder shall
clearly indicate the mode of operation of detectors in his proposal.

9.03.03 The set point shall be selected after giving due consideration for
ventilating air velocity and cable insulation.

9.03.04 Fire detectors shall be equipped with an integral L.E.D. so that it shall be
possible to know which of the detectors has been operated. The
detectors, which are to be placed in the space above the false ceiling or
in the floor void shall not have the response indicators on the body but
shall be provided with remote response indicators.

9.03.05 Approval from Department of Atomic Energy (DAE), Government of

India shall be made available for ionisation type smoke detectors. All
accessories required to satisfy DAE shall also be included in the scope
of supply.

9.03.06 Fire detectors shall be guaranteed to function properly without any

maintenance work for a period of not less than ten (10) years.

10.00.00 PORTABLE AND WHEEL/ TROLLEY MOUNTED FIRE

EXTINGUISHERS

10.00.01 This specification lays down the requirement regarding fire extinguishers
of following types :

Portable fire extinguishers.

a) Pressurised water type.

b) Dry chemical powder type

c) Carbon Dioxide type

Wheel/ Trolley mounted fire extinguishers.

a) Mechanical foam type

10.00.02 All the extinguishers offered by the Bidder shall be of reputed make and
shall be ISI marked.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-36 of 56

C/ENGG/SPEC/FP Rev-6
10.01.00 Design and Construction

10.01.01 All the portable extinguishers shall be of freestanding type and shall be
capable of discharging freely and completely in upright position.

10.01.02 Each extinguisher shall have the instructions for operating the
extinguishers on its body itself.

10.01.03 All extinguishers shall be supplied with initial charge and accessories as
required.

10.01.04 Portable type extinguishers shall be provided with suitable clamps for
mounting on walls or columns.

10.01.05 All extinguishers shall be painted with durable enamel paint of fire red
colour conforming to relevant Indian Standards.

10.01.06 Pressurisation of water type fire extinguishers shall either be done by

compressed air or by using gas cartridge. Both constant air pressure
and the gas pressure type shall conform to IS 15683:2006. Both
these extinguishers shall be ISI marked.

10.01.07 Dry chemical powder type portable extinguisher shall conform to IS

15683:2006.

10.01.08 Carbon Dioxide type portable extinguisher shall conform to

IS:15683:2006 and Carbon Dioxide type trolley mounted
extinguisher shall conform to IS:2878.

10.01.09 Wheel/ trolley mounted fire extinguishers of 50 litre capacity Mechanical

foam type shall conform to IS:13386

10.02.00 Tests and Inspection

10.02.01 A performance demonstration test at site of five (5) percent or one (1)
number whichever is higher, of the extinguishers shall be carried out by
the Contractor. All consumable and replaceable items require for this
test would be supplied by the Contractor without any extra cost to
Employer.

10.02.02 Performance testing of extinguisher shall be in line of applicable Indian

Standards. In case where no Indian Standard is applicable for a
particular type of extinguisher, the method of testing shall be mutually
discussed and agreed to before placement of order for the
extinguishers.

10.03.00 Painting

Each fire extinguisher shall be painted with durable enamel paint of fire
red colour conforming to relevant Indian Standards.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-37 of 56

C/ENGG/SPEC/FP Rev-6
11.00.00 INSTRUMENTS

11.00.01 Intent of Specification

The requirements given in the sub-section shall be applicable to all the

instruments being furnished under this specification.

11.00.02 All field mounted instruments shall be weather and dust tight, suitable
for use under ambient conditions prevalent in the subject plant. All field
mounted instruments shall be mounted in suitable locations where
maximum accessibility for maintenance can be achieved.

11.01.00 Local Instruments

Pressure/ Differential Gauges & Switches.

11.01.01 The pressure sensing elements shall be continuous 'C' bourdon type.

11.01.02 The sensing elements for all gauges/switches shall be properly aged
and factory tested to remove all residual stresses. They shall be able to
withstand atleast twice the full scale pressure/vacuum without any
damage or permanent deformation.

11.01.03 For all instruments, connection between the pressure sensing element
and socket shall be braced or hard soldered.

11.01.04 Gauges shall be of 150 mm diameter dial with die-cast aluminium,

stoved enamel black finish case, aluminium screwed ring and clear
plastic crystal cover glass. Upper range pointer limit stop for all gauges
shall be provided.

11.01.05 All gauges shall be with stainless steel bourdon having rotary geared
stainless steel movements.

11.01.06 Weatherproof type construction shall be provided for all gauges. This
type of construction shall be fully dust tight, drip tight, weather resistant
and splash proof with anti-corrosive painting conforming to NEMA- 4.

11.01.07 All gauges shall have micrometer type zero adjuster.

11.01.08 Neoprene safety diaphragm shall be provided on the back of the

instruments casing for pressure gauges of ranges 0-10 Kg/cm2 and
above.

11.01.09 Scales shall be concentric, white with black lettering and shall be in
metric units.

11.01.10 Accuracy shall be + 1.0 percent of full range or better.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-38 of 56

C/ENGG/SPEC/FP Rev-6
11.01.11 Scale range shall be selected so that normal process pressure is
approximately 75 percent of full scale reading. For pressure gauges and
pressure switches, the range shall not be less than 0 -16 Kg/cm2

11.01.12 All gauges shall have 1/2 inch NPT bottom connection.

11.01.13 All instruments shall conform to IS: 3624 - 1966.

11.01.14 All instruments shall be provided with 3 way gauge isolation valve or
cock. Union nut, nipple and tail pipe shall be provided wherever
required.

11.01.15 Switch element contact shall have two (2) NO and two (2) NC contacts
rated for 240 Volts, 10 Amperes A.C. or 220 Volts, 5 Amperes D.C.
Actuation set point shall be adjustable throughout the range. ON-OFF
differential (difference between switch actuation and de-actuation
pressures) shall be adjustable. Adjustable range shall be suitable for
switch application.

11.01.16 Switches shall be sealed diaphragm, piston actuated type with snap
action switch element. Diaphragm shall be of 316 SS.

11.01.18 Necessary accessories shall be furnished.

11.02.00 Timers

11.02.01 The timers shall be electro-mechanical type with adjustable delay on

pick-up or reset as required.

11.02.02 Each timer shall have two pairs of contacts in required combination of
NO and NC.

11.03.00 Level Gauges/Indicator/Switches

11.03.01 Level Gauges

i) Gauge glasses shall be used for local level indication wherever

shown in the flow diagram.

ii) Gauge glasses, in general, shall be flag glass type with bolted
cover. Body and cover material shall be of carbon steel with rubber
lining.

iii) Level coverage shall be in accordance with operating requirements.

Maximum length of a single gauge glass shall not exceed 1.4 M.
Should a larger gauge glass be required, multiple gauges of
preferably equal length shall be used with 50 mm overlap in
visibility.

iv) Reflex type gauge glasses shall be used for colourless liquids and

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-39 of 56

C/ENGG/SPEC/FP Rev-6
 transparent type gauge glasses shall be used for all liquids having
colour.

v) Each gauge glass shall be complete with a pair of offset valves.

Valves shall have union bonnet, female union level connection,
flanged tank connection, and vent and drain plug.

vi) Offset valves shall have corrosion resistant ball-check to prevent

fluid loss in the event of gauge glass breakage. Valve body shall
have a working pressure of 200 percent of the maximum static
pressure at the maximum process fluid temperature. Valve body
materials shall be of carbon steel with rubber lining.

11.03.02 Level Indicators

i) Float type mechanical level gauges with linear scale type indicator
shall be offered for measuring level of tanks wherever shown in the
flow diagram.

ii) AISI-316 stainless steel float, guide rope and tape shall be used.
Housing shall be of mild steel painted with anti-corrosive painting.

iii) The scale indicator shall be provided at a suitable height for ease of
reading.

iv) Accuracy shall be + 1% of scale range or better.

11.03.03 Level Switches

i) Level switches shall be of ball float operated magnetic type

complete with cage.

ii) Materials of construction shall be suitable for process and ambient

conditions. The float material shall be AISI-316 stainless steel.

iii) Actuating switches shall be either hermetically sealed mercury type

or snap acting micro-switches. Actuation set point shall be
adjustable. ON-OFF differential (difference between switch
actuation and de-actuation levels) shall be adjustable. Adjustable
range shall be suitable for switch application. All switches shall be
repeatable within + 1.0 percent of liquid level change required to
activate switch. Contacts shall be rated for 50 watts resistive at 240
V A.C. Number of contacts shall be two NO and two NC for each
level switch.

11.04.00 Solenoid Valves

11.04.01 The body of the valves shall be Forged brass or stainless steel.

11.04.02 The coil shall be continuous duty, epoxy moulded type Class-F, suitable
for high temperature operation.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-40 of 56

C/ENGG/SPEC/FP Rev-6
11.04.03 The enclosure shall be watertight, dust-tight and shall conform to
NEMA-4 Standard.

11.04.04 The valves shall be suitable for mounting in any position.

11.05.00 Switches, Lamps, Meters Etc.

All electrical components on the panel namely push buttons, switches,

lamps, meters etc. shall meet the requirements of sub-section Electrical
enclosed with the specification.

11.06.00 All local instruments shall be inspected by Employer/Consultant as per

the agreed quality plan.

11.07.00 Makes of control panel and local instruments, accessories shall be as

per Employer's approval.

12.00.00 ELECTRIC MOTORS

12.01.00 General

12.01.01 This clause covers the requirements of three phase squirrel cage
induction motors and single-phase induction motors.

12.01.02 The motors to be furnished, erected and commissioned as covered

under this specification shall be engineered, designed, manufactured,
erected, tested as per the requirements specified herein. These
requirements shall however be read along with the requirements of the
respective driven equipment being supplied under the specification of
which this specification forms a part.

12.01.03 The motor supplied under this specification shall conform to the
standards specified in GTR.

12.01.04 Terminal point for all motors supplied under this specification shall be at
the respective terminal boxes.

12.01.05 Materials and components not specifically stated in this specification but
are necessary for satisfactory operation of the motor shall be deemed to
be included in the scope of supply of this specification.

12.01.06 Notwithstanding anything stated in this motor specification, the motor

has to satisfy the requirement of the mechanical system during normal
and abnormal conditions. For this the motor manufacturer has to co-
ordinate with the mechanical equipment supplier and shall ensure that
the motor being offered meets the requirements.

12.02.00 Codes & Standards

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-41 of 56

C/ENGG/SPEC/FP Rev-6
12.02.21 The design, manufacture, installation and performance of motors shall
conform to the provisions of latest Indian Electricity Act and Indian
Electricity Rules. Nothing in these specifications shall be construed to
relieve the Contractor of his responsibility.

12.02.22 In case of contradiction between this specifications and IS or IEC, the

stipulations of this specification shall be treated as applicable.

12.02.23 National Electrical code for hazardous location and relevant NEMA
standard shall also be applicable for motors located in hazardous
location.

12.03.00 Design Features

12.03.01 Rating and type

(i) The induction motors shall be of squirrel cage type unless specified
otherwise.

(ii) The motors shall be suitable for continuous duty in the specified
ambient temperature.

(iii) The MCR KW rating of the motors for 50oC ambient shall not be
less than the power requirement imposed at the motor shaft by the
driven equipment under the most onerous operation conditions as
defined elsewhere, when the supply frequency is 51.5 Hz (and the
motor is running at 103% of its rated speed).

(iv) Motors shall be capable of giving rated output without reduction in

the expected life span when operated continuously in the system
having the following particulars :

a) Rated terminal voltage

From 0.2 to 200 KW 415V (3 Phase, solidly earthed)

Below 0.2 KW 240 V (1 Phase, solidly earthed)

Variation in voltage + 6%.

b) Frequency 50 Hz + 3%.

c) Any combination of (a) & (b)

12.03.02 Enclosure

Motors to be installed outdoor and semi-outdoor shall have hose proof

enclosure equivalent to IP-55 as per IS: 4691. For motors to be
installed indoor, the enclosure shall be dust proof equivalent to IP-54 as

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-42 of 56

C/ENGG/SPEC/FP Rev-6
 per IS: 4691.

12.03.03 Cooling method

Motors shall be TEFC (totally enclosed fan cooled) type.

12.03.04 Starting requirements

(i) Induction motor

a) All induction motors shall be suitable for full voltage direct on-line
starting. These shall be capable of starting and accelerating to
the rated speed alongwith the driven equipment without
exceeding the acceptable winding temperature even when the
supply voltage drops down to 80% of the rated voltage.

b) Motors shall be capable of withstanding the electro-dynamic

stresses and heating imposed if it is started at a voltage of 110%
of the rated value.

c) The starting current of the motor at rated voltage shall not

exceed six (6) times the rated full load current subject to
tolerance as given in IS : 325.

d) Motors when started with the driven equipment imposing full

starting torque under the supply voltage condition specified
under Clause 12.03.01 (iv) (a) shall be capable of withstanding
at least two successive starts with coasting to rest between
starts and motor initially at the rated load operating temperature.
The motors shall also be suitable for three equally spread starts
per hour, the motor initially at a temperature not exceeding the
rated operating temperature.

e) The locked rotor withstand time under hot condition at 110% of

rated voltage shall be more than the starting time with the driven
equipment at minimum permissible voltage (clause 12.03.04 (i)
(a) by at least two seconds or 15% of the accelerating time
whichever is greater. In case it is not possible to meet the above
requirement the Bidder shall offer centrifugal type speed switch
mounted on the motor shaft which shall remain closed for
speeds lower than 20% and open for speeds above 20% of the
rated speed. The speed switch shall be capable of withstanding
120% of the rated speed in either direction of rotation.

12.03.05 Running requirements

(i) When the motors are operating at extreme condition of voltage and
frequency given under clause no.12.03.01 (iv) the maximum
permissible temperature rise over the ambient temperature of 50 oC
shall be within the limits specified in IS : 325 after adjustment due

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-43 of 56

C/ENGG/SPEC/FP Rev-6
 to increase ambient temperature specified herein.

(ii) The double amplitude of motor vibration shall be within the limits
specified in IS: 4729. Vibration shall also be within the limits
specified by the relevant standard for the driven equipment when
measured at the motor bearings.

(iii) All the induction motors shall be capable of running at 80% of rated
voltage for a period of 5 minutes with rated load commencing from
hot condition.

(iv) Induction motors shall be so designed as to be capable of

withstanding the voltage and torque stresses developed due to the
difference between the motor residual voltage and incoming supply
voltage during fast changeover of buses. The necessary feature
incorporated in the design to comply with this requirement shall be
clearly indicated in the proposal.

(v) Motors shall be capable of developing the rated full load torque
even when the supply voltage drops to 70% of rated voltage. Such
operation is envisaged for a period of one second. The pull out
torque of the induction motors to meet this requirement shall not be
less than 205% of full load torque.

(vi) The motors shall be capable of withstanding for 10 seconds without

stalling or abrupt change in speed (under gradual increase of
torque) an excess torque of 60 percent of their rated torque, the
voltage and frequency being maintained at their rated value.

(vii) Guaranteed performance of the motors shall be met with

tolerances specified in respective standards.

12.04.00 Construction Features

12.04.01 Stator

(i) Stator frame

The stator frames and all external parts of the motors shall be rigid
fabricated steel or of casting. They shall be suitably annealed to
eliminate any residual stresses introduced during the process of
fabrication and machining.

(ii) Stator core

The stator laminations shall be made from suitable grade magnetic

sheet steel varnished on both sides. They shall be pressed and
clamped adequately to reduce the core and teeth vibration to minimum.

(iii) Insulation and winding

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-44 of 56

C/ENGG/SPEC/FP Rev-6
 All insulated winding conductor shall be of copper. The overall motor
winding insulation for all 415 volts motors shall be of epoxy thermoset-
ting type i.e., class 'F' but limited to class-B operating from temperature
rise consideration. Other motors may be of conventional class-B type.
The windings shall be suitable for successful operation in hot, humid,
tropical climate with the ambient temperature of 50oC.

12.04.02 Rotor

(i) Rotors shall be so designed as to keep the combined critical

speed with the driven equipment away from the running speed by
atleast 20%.

(ii) Rotors shall also be designed to withstand 120% of the rated

speed for 2 minutes in either direction of rotation.

12.04.03 Terminal box leads

(i) For motors of 415 Volts and below a single terminal box may be
provided for power and accessories leads.

(ii) Terminal boxes shall be of weatherproof construction designed for

outdoor service. To eliminate entry of dust and water, gaskets of
neoprene or approved equivalent shall be provided at cover joints
and between box and motor frame.

(iii) Terminal box shall be suitable for top and bottom entry of cables.

(iv) Unless otherwise approved, the terminal box shall be capable of

being turned through 360o in steps in 90o.

(v) The terminals shall be complete with all accessories for

connecting external cables. They shall be designed for the current
carrying capacity and shall ensure ample phase to phase to
ground clearances.

(vi) Suitable tinned brass compression type cable glands and cable
lugs shall be supplied by the Contractor to match Employer's
cable.

(vii) Terminal box for single core cable shall be of non- magnetic
material.

(viii) Marking of all terminals shall be in accordance with IS : 4728.

12.04.04 Rating Plates

(i) Rating plates shall be provided for all motors giving the details as
called for in IS:325 (for three phase squirrel cage induction

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-45 of 56

C/ENGG/SPEC/FP Rev-6
 motors).

(ii) In addition to above, the rating plate shall indicate the following :

a) Temperature rise in oC under normal working conditions.

b) Phase sequence corresponding to the direction of rotation for the

application.

c) Bearing identification number (in case of ball/ roller bearing) and

recommended lubricants.

12.04.05 Other Constructional Features

(i) Two independent earthing points shall be provided on opposite

sides of the motor for bolted connection of Employer's earthing
conductor to be specified to the successful Bidder.

(ii) Motor weighing more than 25 kg. shall be provided with eyebolts,
lugs or other means to facilitate lifting.

12.05.00 Paint and Finish

12.05.01 Motor external parts shall be finished and painted to produce a neat and
durable surface, which would prevent rusting and corrosion. The
equipment shall be thoroughly degreased, all sharp edges and scales
removed and treated with one coat of primer and two coats of grey
enamel paint.

12.05.02 Motor fans shall also be painted to withstand corrosion.

12.05.03 All fasteners used in the construction of the equipment shall be either of
corrosion resistant material or heavy cadmium plated.

12.05.04 Current carrying fasteners shall be either of stainless steel or high

tensile brass.

12.06.00 Tests at Manufacturers Works

12.06.01 Motors shall be subject to routine tests in accordance with IS : 325 & IS :
4029 standards.

12.06.02 In addition, the following tests shall also be carried out :

a) 20% over speed test for 2 minutes on all rotors.

b) Measurement of vibration.

c) Measurement of noise level.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-46 of 56

C/ENGG/SPEC/FP Rev-6
 d) Phase sequence and polarity checks relative to mechanical
rotation.

12.06.03 Tests after installation at site

(i) After installation and commissioning at site, the motors alongwith

the driven equipment shall be subject to tests to ascertain their
conformity with the requirement of this specification and those of
the driven equipment specification and the performance data
quoted by the Bidder.

(ii) In case of non-conformity of the motor with these specifications and

performance requirement, the Engineer may at his discretion reject
or ask for necessary rectification/replacement as detailed in
general Terms and Conditions of Contract (GCC) Volume-I.

13.00.00 BATTERY & BATTERY CHARGERS

This clause covers the design, performance, manufacturing,

construction features and testing of Battery and Battery charger used
primarily for starting the diesel engine driving the fire water pumps.
Battery Chargers shall be housed in Diesel Engine Panel.

13.01.00 General Information

13.01.01 The equipment specified hereinafter are required for starting the diesel
engines and other operation of the plant as required.

13.01.02 For each diesel engine there shall be two (2) sets of Battery and two (2)
sets of Battery Charger.

13.01.03 The D.C. voltage shall be obtained normally after necessary rectification
by battery charger. The Battery Charging system shall be capable of
meeting the following requirements :

13.01.04 Float charging the Battery.

13.01.05 Boost Charging the Battery.

13.01.06 The battery shall be large enough to crank the engine 3 times without
charging in between and without getting drained to an extent which will
affect its life.

13.01.07 The Bidder shall indicate the battery voltage and battery capacity in
Ampere- Hour at ten (10) hour discharge rate. The battery voltage at
any time during operation shall not be less than the minimum voltage
required for operation of the D.C. loads.

13.02.00 General Design

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-47 of 56

C/ENGG/SPEC/FP Rev-6
 The Battery shall be located indoor

13.02.01 Battery

(i) The cells shall be lead-acid type. The Battery shall be automotive
type.

(ii) The cells shall be sealed in type with anti-splash type vent plug.

(iii) The cell terminal posts shall be provided with connector bolts and
nuts, effectively coated with lead to prevent corrosion. Lead or
lead coated copper connectors shall be furnished to connect up
cells of battery set.

(iv) Positive and Negative terminal posts shall be clearly and indelibly
marked for easy identification.

(v) The electrolyte shall be of battery grade Sulphuric Acid conforming

to IS : 226-2962. Water for storage batteries conforming to IS :
1069 shall be used in the preparation of the electrolyte.

13.02.02 Battery Charger

(i) The Bidder shall furnish the battery charging scheme complete with
all necessary accessories such as transformers, switches, fuses,
starters, contactors, diodes, ammeters, voltmeters and other
devices as required for trouble free operation. All devices and
equipment shall conform to relevant Indian Standard or shall be
Superior to it.

(ii) The scheme of the battery charger shall be such that the battery
can be charged automatically as well as manually.

(iii) The boost charger shall have sufficient capacity to restore a fully
discharged Battery to a state of full charge in eight (8) hours with
some spare margin over maximum charging rate. Suitable
provision shall be kept so that, for a particular engine, any of the
two (2) charger units can be used for charging any of the two (2)
batteries.

(iv) The instruments, switches and lamps shall be flush/semi-flush

mounted on the front panel. Name plate of approved type shall be
provided for each of these equipment.

(v) The panel shall be complete with internal wiring and input-output
terminal block. Terminal blocks shall be clip on type of suitable
rating. All equipment and wire terminals shall be identified by
symbols corresponding to applicable schematic/wiring diagram.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-48 of 56

C/ENGG/SPEC/FP Rev-6
 (vi) Space heaters of adequate capacity shall be provided to prevent
moisture condensation in the panel.

13.03.00 Testing

13.03.01 The Battery Charger shall also be subjected to the following tests at
manufacturer's works as per IS - 4540

13.03.02 Insulation test.

13.03.03 Connection checking.

13.03.04 Measurement of voltage regulation.

13.03.05 Auxiliary of devices.

13.03.06 Alternating current measurement.

13.03.07 Performance test.

13.03.08 Temperature rise test.

13.03.09 Following acceptance tests shall be carried out in batteries as per

IS:1651.

a) Marking and packing

b) Verification of dimensions

c) Test for capacity

d) Test for voltage during discharge

Battery and battery charger shall be checked for auto charging and
providing sufficient power for three consecutive starting kicks to diesel
engine within five minutes with A.C. supply switched off.

14.00.00 CONTROL & ANNUNCIATION PANELS

14.01.00 Intent of Specification

The following requirement shall be applicable to the control and

annunciation panels furnished under these specifications.

14.02.00 General Information

14.02.01 The equipment specified herein are required for controlling, metering,
monitoring and indication of electrical systems of the plant offered.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-49 of 56

C/ENGG/SPEC/FP Rev-6
14.02.02 The selection and design of all the equipment shall be so as to ensure
reliable and safe operation of the plant and shall be subjected to
approval by the Employer.

14.02.03 The reference ambient temperature outside the panel shall be taken as
50oC and relative humidity 100%.

14.03.00 Equipment to be Furnished

Control & annunciation panels shall be furnished complete with all

accessories and wiring for safe and trouble free operation of the plant.
Details are included in sub-section General.

14.04.00 Constructional Details

14.04.01 The panel frames shall be fabricated using suitable mild steel structural
sections or pressed and shaped cold-rolled sheet steel of thickness not
less than 2.5 mm. Frames shall be enclosed in cold-rolled sheet steel of
thickness not less than 1.6 mm. Stiffeners shall be provided wherever
necessary.

14.04.02 Panels shall be of free standing type and shall be provided with hinged
door with locking arrangement. The access doors, cutest and covers
shall be equipped with neoprene/synthetic rubber gaskets (conforming
to IS 11149-1984) all around and the latches sufficiently strong to hold
them in alignment when closed. The panels to be installed outdoor or
semi outdoor shall have a degree of protection of IP:55 and those
installed indoor shall have a degree of protection of IP:52 as per
IS:13947 Part-1.

14.04.03 If a panel consists of a number of panels, each panel should be

mounted side by side and bolted together to form a compact unit, when
two panels meet, the joints shall be smooth, close fittings and un-
obstructive.

14.04.04 Removable eye bolt or lifting lugs shall be provided on all panels to
facilitate easy lifting.

14.04.05 The heights of all operating equipment on the panel shall be between
800 mm to 1600 mm from the finished floor level. The proper supporting
arrangement shall be provided by the Contractor.

14.04.06 Cable entries to the panel may be from bottom or top. The cable entry
required will be intimated to the successful Bidder. A suitable
removable gland plate of 3 mm thick shall be mounted not less than 200
mm above the floor level.

14.04.07 All equipment mounted on the front face of the panels shall be flush or
semi-flush type. All equipment shall be so located that their terminal

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-50 of 56

C/ENGG/SPEC/FP Rev-6
 and adjustment are readily accessible for inspection or maintenance and
their removal and replacement can be done without interruption of
service to other equipment. The contractor shall submit the panel
general arrangement drawings clearly bringing out internal mounting
details, dimensions of equipment, clearance between the equipment and
the edges of the panel, for approval.

14.05.00 Name Plates and Labels

14.05.01 Each panel shall be provided with prominent, engraved identification

plates for all front mounted equipment. Panel identification name plate
shall be provided at front and rear as required.

14.05.02 All name plates shall be of non-rusting metal or 3 ply lamicold, with
white engraved lettering on black background. Inscription and lettering
sizes shall be subjected to Employer's approval.

14.05.03 Suitable plastic sticker labels shall be provided for easy identification of
all equipment located inside the panel. These labels shall be positioned
so as to be clearly visible and shall give the device number, as
mentioned in the wiring drawings.

14.06.00 AC/DC Power Supply

14.06.02 The Employer will provide one feeder each for AC and DC to the panel.
The Contractor shall make for his own arrangements for providing these
power supplies to different panels.

14.06.02 The Contractor shall provide suitable isolating switch fuse unit in the
control panel for receiving the above incoming AC and DC supplies.
Fuse and link shall be provided for isolating of individual circuit without
disturbing other circuits.

14.07.00 Wiring

14.07.01 All inter panel wiring and connections between panels (if there is group
of panels) including all bus wiring for AC & DC supplies shall be
provided by the Contractor.

14.07.02 All internal wiring shall be carried out with 1100 V grade, single core, 1.5
square mm or larger stranded copper wires having colour-coded PVC
insulation. CT circuits shall be wired with 2.5 square mm copper wires,
otherwise similar to the above.

14.07.03 Extra-flexible wire shall be used for wiring to devices mounted on

moving parts such as doors.

14.07.04 Spare contacts of auxiliary relays, timers and switches shall be wired out
to the terminal blocks as required by the Employer/Engineer at the time
of detailed engineering.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-51 of 56

C/ENGG/SPEC/FP Rev-6
14.08.00 Terminal Blocks

14.08.01 Terminal Blocks shall be of 650V grade, rated for 10 Amps and in one-
piece moulding. It shall be complete with insulating barriers, clip-on-
type terminals, and identification strips. Marking on terminal strip shall
correspond to the terminal numbering on wiring diagrams. It shall be
similar to 'Elmex-Standard' type terminals.

14.08.02 Terminal blocks shall be arranged with at least 100 mm clearance

between two sets of terminal block.

14.08.03 The terminal blocks shall have at least 20% spare terminals.

14.09.00 Grounding

A continuous copper bus 25 x 3 mm size shall be provided along the

bottom of the panel structure. It shall run continuously throughout the
length of the panel and shall have provision at both ends for connection
to the station grounding grid (25 x 6 mm MS Flat).

14.10.00 Space Heater and Lighting

14.10.01 Space heaters shall be provided in the panels for preventing harmful
moisture condensation.

14.10.02 The space heaters shall be suitable for continuous operation on 240V
AC, 50 Hz, single phase supply and shall be automatically controlled by
thermostat. Necessary isolating switches and fuses shall also be
provided.

14.10.03 Free standing panel shall have a 240V AC, plug point and a fluorescent
light operated by door switch.

14.11.00 Control and Selector Switches

14.11.01 Control and selector switches shall be of rotary type, with escutcheon
plates clearly marked to show the function and positions.

14.11.02 Control/selector switches shall be spring return or stay put type as per
the requirements. Handles of control/selector switches shall be black in
colour. Shape and type of handles shall be to the approval of the
Employer.

14.11.03 The contact ratings shall be at least the following :

i) Make and carry continuously 10 Amp.

ii) Breaking current at 240V DC 1Amp. (Inductive)

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-52 of 56

C/ENGG/SPEC/FP Rev-6
 iii) Breaking current at 240V DC 5 Amp. at 0.3 p.f. lagging

14.12.00 Push Buttons

14.12.01 Push buttons shall be spring return, push to actuate type and rated to
continuously carry and break 10A at 240V AC and 0.5A (Inductive) at
220V DC. The push buttons shall have at least 1 NO and 1 NC contact.
All contact faces shall be of silver or silver alloy.

14.12.02 All push buttons shall be provided with integral escutcheon plates
marked with its function.

14.12.03 The colour of buttons shall be as follows :

Green For motor START, Breaker CLOSE, Valve/ damper OPEN.

Red For motor TRIP, Breaker OPEN, Valve/ damper CLOSE.

Black For all annunciation functions, overload reset and

miscellaneous.

14.12.04 Red push buttons shall always be located to the left of green push
buttons. In case of clinker grinder etc. the push buttons would be black-
red-green from left to right.

14.13.00 Indicating Lamps

14.13.01 Indicating lamps shall be of the panel mounting, filament type and of
low-watt consumption. Lamps shall be provided with series resistors
preferably built-in- the lamps assembly. The lamps shall have
escutcheon plates marked with its function, wherever necessary.

14.13.02 Lamp shall have translucent lamp covers of the following colours :

Red for motor OFF, Valve/damper OPEN, Breaker CLOSED.

Green for motor ON, Valve/damper CLOSED, Breaker OPEN.

White for motor AUTO-TRIP.

Blue for all healthy conditions (e.g. control supply, lub oil pressure
and also for spring charged).

Amber for all ALARM conditions (e.g. pressure low, over load and also
for 'service' and 'Test' position indication).

14.13.03 Bulbs and lamps covers shall be easily replaceable from the front of the
panel.

14.13.04 Indicating lamps should be located directly above the associated push

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-53 of 56

C/ENGG/SPEC/FP Rev-6
 button/control switches. Red lamps shall variably be located to the right
of the green lamp. In case a white lamp is also provided, it shall be
placed between the red and green lamps. Blue and amber lamps
should normally be located above the red and green lamps.

14.14.00 Fuses

14.14.01 All fuses shall be of HRC cartridge plug-in-type and shall be of suitable
rating, depending upon circuit requirements.

14.14.02 All fuses shall be mounted on fuse carriers, which shall be mounted on
fuse-bases.

14.15.00 Contactors

14.15.01 Contactors shall be of air break, electromagnetic type rated as per

requirement. These shall be of utilisation category AC 3 as per IS:2959.

14.15.02 Operating coils of AC contactors shall be of 240V AC or 220V DC as

required. AC contactors shall operate satisfactorily between 85% to
110% of the rated voltage. The Contactor shall not drop out at 70% of
the rated voltage.

14.15.03 DC contactors shall have a coil voltage of 220V DC and shall be suitable
for satisfactory continuous operation at 80% to 110% of the rated
voltage.

14.16.00 Relays and Timers

14.16.01 All auxiliary relays & timers shall be of proven design and of reputed
make. Contacts of relays and timers shall be of solid silver or silver
cadmium oxide or solid silver faced. Timers shall have the provision to
adjust the delay on pick-up or reset as required.

14.16.02 All relays and timers shall have at least two NO and two NC contacts.

14.16.03 All relays and timers shall be suitable for 240V AC and 220V DC as
required. DC relays shall operate satisfactorily between 70% to 110%
and AC relays shall be suitable for voltage variation between 80% to
110%.

14.17.00 Indication Instruments

14.17.01 All indicating and integrating meters shall be flush mounted on panel
front. The instruments shall be of at least 96 mm square size with 90
degree scales and shall have an accuracy class of 2.0 or better. The
covers and cases of instruments and meters shall provide a dust and
vermin proof construction.

14.17.02 All instruments shall be compensated for temperature errors and factory

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-54 of 56

C/ENGG/SPEC/FP Rev-6
 calibrated to directly read the primary quantities. Means shall be
provided for zero adjustment removing or dismantling the instruments.

14.17.03 All instruments shall have white dials with black numerals and lettering.
Black knife edge pointer with parallax free dials will be preferred.

14.17.04 Ammeters provided on motor feeders shall have a compressed scale at

the upper current region to cover the starting current.

14.18.00 Annunciation System

14.18.01 The annunciation system shall be complete with all necessary relays,
flashers and other accessories required for the proper operation of the
equipment and shall be completely solid state. The control circuit shall
be mounted on plug-in type glass epoxy printed circuit boards. Audible
alarms for the system shall be mounted inside the panel. One set of
acknowledge, test and reset push buttons shall be mounted on the
panel.

14.18.02 Indications shall be engraved on Acrylic inscription plate window and

shall be visible clearly when the indication lamp is lighted (black letters
on white background). Each window shall be provided with two lamps.

14.18.03 Audible hooter shall sound when a trouble contact operates and shall
continue to sound until the acknowledge button is pressed. In addition to
the hooters provided on annunciation panels, a hooter shall be provided
outside FFPH which shall sound in any fire alarm condition.

14.18.04 Indication lamps shall flash when trouble contact operates and shall
continue flashing until acknowledge button is pressed.

14.18.05 After acknowledge button is pressed, the hooter and flashing shall stop
but the indication lamp shall remain lighted.

14.18.06 After trouble is cleared indication lamps shall be ready and shall go off
only when reset.

14.18.07 Silencing the hooter in conjunction with one trouble contact shall not
stop and hooter sounding if another trouble contact operates.

14.18.08 When test button is pressed, all lamps shall flash and hooter shall
sound.

14.18.09 Annunciator systems shall operate on 220V DC Systems.

14.18.10 The annunciation system shall include alarm for AC control system
failure (working on DC supply), DC supply failure (working on AC
supply) and test facilities for these alarms.

14.18.11 List of annunciations required on the panels has been listed elsewhere.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-55 of 56

C/ENGG/SPEC/FP Rev-6
 The Contractor shall also provide additional annunciations if desired by
the Employer/Engineer during Vendor drawing review stage and for
such additional annunciations no extra charges shall be claimed by the
Contractor, if the number of such additions are within 10% of the
number stipulated in this specification.

14.18.12 20% spare windows shall be provided on the panel.

14.19.00 Painting

14.19.01 Painting procedure adopted shall conform to requirements given in

GTR. The paint thickness shall not be less than 60 microns. Finished
parts shall be coated by peelable compound by spraying method to
protect the finished surface from scratches, grease, dirt and oily spots
during testing, transportation handling and erection.

14.20.00 Tests

14.20.01 Following tests/inspection shall be carried out by the Contractor in the

presence of Employer's representative :

(A) Factory Tests

1. Compliance with approved drawings, data and specification.

2. Visual check for workmanship.

3. Wiring continuity and functional checks.

4. Calibration of instruments, relays and metres wherever required by

inspector.

5. HV test

6. Insulation resistance measurement before and after HV test.

(B) Inspection/Testing at site :

1. IR test before and after HV test

2. HV Test

3. Functional Testing.

(C)

1. The Fire detection and annunciation panel shall be subjected to

functional tests.

2. The Annunciation System shall be routine tested

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION PAGE-56 of 56

C/ENGG/SPEC/FP Rev-6
 APPENDIX—II
TO TECHNICAL SPECIFICATION
FOR FIRE PROTECTION SYSTEM REV.-6
5000 5000 5000 5000 5000 5000

IBC IBC y tam

WI
A 0
0 0 0
ACDB/DCDB ROOM
14840 X 9770
- CD
0 0
U.

0
BATTERY ROOM BILL OF QUANTITY FOR FIRE EXTINGUISHERS.
4800 X 6620 SYMBOL TYPE QUANTITY
TROL ROOM
)0 X 4770 A 4.5 KG CO2 08+1•

ELECTRICAL LAB
0 • 9 LITRE WATER 04

4885 X 4840 5 KG DCP 01.4•

• FOR FIRE WATER PUMP HOUSE AND DG Sr,

BILL OF QUANTITY FOR FIRE DETECTORS.
SYMBOL ITEM QUANTITY

0 IONIZATION DETECTORS 24

0 HEAT DETECTOR 01

E REMOTE RESPONSE
011
INDICATOR
[Z3 MANUAL CALL POINT 04

DI HOOTER 02.If
0 FOR FIRE WATER PUMP HOUSE.

NOTES
ALL DIMENSIONS ARE IN MM. UNLESS OTHERWISE SPECIFIED.
ADMINISTRATIVE
OFFICE AREA
14840 X 9720

0 0

GROUND FLOOR PLAN

POWER GRID CORPORATION
OF INDIA LIMITED
(A Government of India Enterprise)

PROJECT
800/400/220 ICV SUB-STATION

STANDARD CONTROL ROOM BUILDING

LOCATION OF DETECTORS AND PORTABLE
EXTINGUISHERS
SC IPTION REVD VD. 0-CC. VD. APPD. DA DDAWINGNO. WARE
CLEARED RE C-ENG/CRB-400/FP-STD-02 1:100 0
 APPENDIX-III (SHEET I OF 4)
TO TECHNICAL SPECIFICATION
I FOR FIRE PROTECTION SYSTEM REV.-IC

OF REDIATOR
PSI 11144 14145 11146
-500 062
trig 575 575
D827
r -111 • -tom
)

18

11143
OF N.G.R.

600 2465
N142
1.---.4=mazzaziabgimc „ 111
14129 PSI 1•24
I • I_.=.= 47)) 4
I (1)
N141 111
MIN
0 dal OF
16326

REACTOR
- -00923
8 PS17
0131 41,
tPS16 I NT39
600 2985H 900
VU
2
1
OF REDIATOR
013
P510 14128 2265 600

1
OF SHUNT REACTOR

N725 /WIM
".1H
111111WilAr
immimo
NT24 1 U 017 D76
D1316? 1)815 .4- N112
PS9 1 1:

• D15
D814
14123 PS00 NT22 N119 1411434"36
8 13- P47 L.100

P LA\ VIEW
TYPICAL SPRAY SYST- V DRAW! F3R REACTC
 APPENDIX-III (SHEET 2 OF 4)
TO TECHNICAL SPEOFICATION
FOR FIRE PROTECTION SYSTEM REV.-if

.111.111111.

O
O
LC)

ILEVAT \
TYR CAL SPRAY SYSTEM DRAW \C FOR REACTOR
 APPENDIX-III (SHEET 3 OF 4)
TO TECHNICAL SPECIFICATION
FOR FIRE PROTECTION SYSTEM REV.-6

.44134

143312:
431 24 4.
72' 42342
*4 3 43
4529411)1

2994 • 4432 42419541 4 431 r412

042
*34
415
9954 41435
*
1416
I*3602.,
t.
• , 164133
V V V
Or • 1•*
.t17.2.7 N'1I
'3517 "G
1: Dr3 2014 1442 NUR
44104 *12 4932 4061
— —0
41 24
c*-54 4444 4 44413
1 '124:4* 4438 4410
Kr75 i____0 q09s L____,1 4175
*176 ') I
' ST44
, 25 4192
4433 2•7
*124 t
— 01313
1907
014939
445125

t .
0134

411251.
44 '13231.
4211 223644
45122

te34 5.'2 .7 9545

-
gt,
i 457 23 419% I 1310 I 4 044441
*721 - 45923 PS32474) 1
4315 i 1324 1 1
I — 44 47 . trI7
4*31 9;4
•w 451:1 42;0 1 4
1 41,....4,_1 __•
_._3 — .2=2 _
239
I
424.3
44 491191
(IL 1D.1,B11202 ' 11-
—4 — 1 5,-- — —• —* ,,tx
—N449
13
4 214 1.272. -*-- 42773
4194)1 3 1'713 7, 424.4
1111 ' I
1*21 4.9:923 77-6-7,2 SW
41Y75 2 1
1. th
41450 N112A1t14 • • 44449 12323 44,8 4442:
I 3'374 *SS 1 l'w3e1 4441
4-42 1 • 33344 OS75
LB• 9 40
* I 4 K2*
14E517
fit,34

14247
101 1 4
PLAN VIEW
4_21 3, 92
4
.11135
• 42390 14199
0437 4t9116 4015 *1 14

TYPICAL SPRAY SYSTEM DRAWING FOR ICT

 APPENDIX-III (SHEET 4 OF 4)
TO TECHNICAL SPECIFICATION
FOR FIRE PROTECTION SYSTEM REV.-6

----- • ..._,..,....--
4e----- "-*
4-

,414 1,

ari

1
1
40'",,6 4:i.,2,
4 4
2,
C. 4+ -41,_ _ —) -----.)

ELEVATION
TYPICAL SPRAY SYSTEM DRAWING FOR ICT
•
 Appendix-IV
Sheet 1 of 13

TECHNICAL DATA SHEETS

DATA SHEET FOR DELUGE VALVE

1.0 Manufacturer POWERGRID Approved make

2.0 Number & size As per approved system
drawings.
3.0 Type Differential Diaphragm type.
4.0 Rating
4.1 Flow in M3/hr.
1. 150 mm ø 170 to 650
2. 100 mm ø 50 to 225
4.2 Pressure Working Pressure – 12.3 kg/cm2
Test Pressure - 25 kg/cm2.
4.3 Pressure drop in equivalent length
1. 150 mm ø 19M
2. 100 mm ø 11M
5.0 Material of construction
5.1 Body CI IS:210 Gr. FG 260
5.2 Valve internal Cast Bronze – IS:318-LTB 2
5.3 Seat Seal Neoprene Rubber
5.4 Diaphragm Neoprene Rubber
6.0 Differential pressure required for Differential Ratio – 50%
operation
7.0 Water Motor Gong provided Yes
7.1 Type Hydraulic type
7.2 Material of Construction:
7.2.1 Housing Al. Alloy-IS:617
7.2.2 Cover/Rotor./Gong Aluminium to IS:737
7.2.3 Manual actuation lever provided? Yes
8.0 Remote actuation with Solenoid Valve Yes
provided?
9.0 Resetting type Manual resetting type
10.0 Deluge valve complete with test and Yes
drain valves, manual operation
arrangement, supporting structures and
all necessary accessories.
11.0 Approval of Deluge Valve. FM of USA, UL of USA, LPCB
of U.K. or VDS of Germany

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 2 of 13

DATASHEET FOR HVW SPRAY NOZZLE

1.0 Make POWERGRID Approved make

2.0 Type High velocity water spray type

3.0 Working pressure 3.5 bar to 5 bar

4.0 Material Brass

5.0 K factor As per approved design &

drawings

6.0 Quantity As per approved design &

drawings

7.0 Integral non-ferrous strainer provide Yes

8.0 Approval of HVW spray Nozzle. FM of USA, UL of USA, LPCB

of U.K. or VDS of Germany

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 3 of 13

DATA SHEET FOR QUARTZOID BULB DETECTORS

1.0 Make POWERGRID Approved make

2.0 Type Quartzoid bulb type
3.0 Rated pressure 12.3 kg/ cm2 (175 PSI).
4.0 Hydrotest pressure 30kg/cm2
5.0 Material of construction
5.1 Frame Bronze
5.2 Bulb Glass
5.3 Deflector Copper
6.0 Temperature rating 79oC
7.0 Quantity As per approved drawings
8.0 Approval of Detector FM of USA, UL of USA, LPCB of
U.K. or VDS of Germany

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 4 of 13

DATA SHEET FOR OPTICAL SMOKE DECTECTOR

1.0 Manufacturer POWERGRID Approved make

2.0 Principle of operation Light scattering by smoke particles.

3.0 Max. recommended spacing 9 m.
4.0 Normal operating temperature -10oC to 60oC
5.0 Guaranteed to function properly Yes. Accumulated dust to be removed
without any maintenance work for periodically by blowing air.
a period of not less than ten (10)
years
6.0 Approval of detector FM of USA, UL of USA, LPCB of U.K.
or VDS of Germany
7.0 Cabling. 2C x 1.5 sq.mm.
Un-armoured PVC insulated FR cables
conforming to IS 1554 (Part 1).

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 5 of 13

DATA SHEET FOR HEAT DECTECTOR

1.0 Manufacturer POWERGRID Approved make
2.0 Principle of operation Rate of rise-cum-fixed temperature
type.
3.0 Set point of operation 5oC per minute / 55oC
4.0 Max. recommended spacing 6 m.
5.0 Normal operating temperature -20 C to 70oC
o

6.0 Guaranteed to function properly without Yes. Accumulated dust to be removed

any maintenance work for a period of not periodically by blowing air.
less than ten (10) years
7.0 Approval of detector FM of USA, UL of USA, LPCB of
U.K. or VDS of Germany
8.0 Cabling. 2C x 1.5 sq.mm.
Un-armoured PVC insulated FR cables
conforming to IS 1554 (Part 1).

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 6 of 13

DATA SHEET FOR IONISATION SMOKE DECTECTOR

1.0 Manufacturer POWERGRID Approved make
3.0 Principle of operation Ionisation of air by Radio-active source.
4.0 Radio-active source Americium - 241
5.0 Max. recommended spacing 9 m.
6.0 Normal operating temperature -10oC to 60oC
8.0 Guaranteed to function properly Yes. Accumulated dust to be removed
without any maintenance work for a periodically by blowing air.
period of not less than ten (10) years
9.0 Approval of detector FM of USA, UL of USA, LPCB of U.K.
or VDS of Germany
10.0 Cabling. 2C x 1.5 sq.mm.
Un-armoured PVC insulated FR cables
conforming to IS 1554 (Part 1).

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 7 of 13

DATA SHEET FOR 2C x 1.5sq.mm Un-armoured cable.

1 Make POWERGRID approved make

2 Type Control Cable

3. Number of cores Two (2)

4. Size 1.5 sq. mm.

5. Voltage Grade 1.1 kV

6. Applicable standard IS:1554 Part 1
7. Conductor Material Plain annealed electrolytic copper
8. Conductor construction Stranded
9 Conductor resistance. 12.1 Ohms/kM at 20o C
10 Insulation material PVC insulation Type A as per IS:5831
11 Insulation thickness 0.8 mm Nominal
12 Identification Red & Black
13 Inner sheath material PVC compound Type ST1 as per IS:5831
14 Inner sheath thickness 0.3 mm Minimum
15 Outer sheath material PVC compound Type ST2 as per IS:5381,FR.
16 Outer sheath thickness 1.8 mm Nominal.
17 outer sheath colour Grey
18 Overall Diameter As per manufacturer design data

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 8 of 13

DATA SHEET FOR MANUAL CALL POINT

1.0 Manufacturer POWERGRID Approved make

2.0 Construction Deep drawn sheet steel

3.0 Type Break glass with push button.

4.0 Operating Voltage 24V DC ± 10%

5.0 Type of control Pole- NO/NC

6.0 Degree of protection IP 52

7.0 Material of housing. M.S. 18 Gauge

8.0 Colour FIRE RED

9.0 Accessories Hammer & Chain assembly

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 9 of 13

DATA SHEET FOR FIRE ALARM SOUNDER (HOOTER)

1.0 Manufacturer POWERGRID Approved make

2.0 Construction Deep drawn sheet steel

3.0 Type Dual tone/ Single tone

4.0 Operating Voltage 24V DC ± 10%

5.0 Output Not less than 80dB(A) but not
more than 120dB(A) at 1.5m
distance.
6.0 Output frequency range 500Hz. to 1000 Hz.

7.0 Operating time 50 minutes (Minimum)

8.0 Material of housing. M.S. 18 Gauge

9.0 Colour FIRE RED

10.0 Marking FIRE ALARM.

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 10 of 13

DATA SHEET FOR GLOBE VALVE.

1.0 Nominal size in mm. 15 TO 40

2.0 Make POWERGRID approved make

3.0 Type Globe

4.0 Number As per approved system drawings.

5.0 Material of construction

5.1 Body Bronze to IS 318 Grade LTB 2

5.2 Hand wheel Grey cast iron, grade FG200 of IS 210.
5.3 Bonnet & Bonnet Wedge Bronze to IS 318 Grade LTB 2
5.4 Trim Bronze to IS 318 Grade LTB 2

6.0 End connection Screwed

7.0 Standard IS:778
8.0 Rating PN 1.6
9.0 Hydrostatic test pressure
9.1 Body 24 kg/cm2
9.2 Seat 16 kg/cm2

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 11 of 13

DATA SHEET FOR GUN METAL GATE/ SLUICE VALVE.

1.0 Nominal size in mm. 15 to 40 50 to 300

2.0 Make POWERGRID Approved make

3.0 Type Gate/Sluice

4.0 Number As per approved system drawings.

5.0 Material of construction

5.1 Body Bronze to IS 318 Grey cast iron, grade

Grade LTB 2 FG200 of IS 210.
5.2 Hand wheel Grey cast iron, grade FG200 of IS 210.
5.3 Bonnet & Wedge Bronze to IS 318 Grey cast iron, grade
Gr.LTB 2 FG200 of IS 210.
5.4 Stem High tensile brass, Stainless steel
grade HT1 or HT2
of IS:320
6.0 End connection Screwed Flanged
7.0 Standard IS:778 IS:14846
8.0 Rating PN 1.6
9.0 Hydrostatic test pressure
9.1 Body 24 kg/cm2
9.2 Seat 16 kg/cm2

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 12 of 13

DATA SHEET FOR FLOAT OPERATED VALVE

1.0 Manufacturer POWERGRID Approved make
2.0 Type Float operated valve
3.0 Size 100 MM
4.0 Quantity 2 nos.
5.0 Material of construction
5.1 Body Cast Iron (IS:210 FG:200)
5.2 Seat Ring Gun Metal (IS:318, LTB-2)
5.3 Disc Ring Gun Metal (IS:318, LTB-2)
5.4. Spindle 13% Cr. Stainless steel
5.5 Piston Cast Iron (IS:210, FG:200)
5.6 Lever Mild Steel (IS:226)
5.7 Float Tin Coated Copper
5.8 Fulcrum Mild Steel (IS:226)
5.9 Pilot Valve Stainless Steel (AISI-304)
5.10 Gland Packing Graphited Asbestos Rope
5.11 Bonnet Cast Iron (IS:210, FG:200)
6.0 Hydrostatic test pressure
6.1 Body 15 kg / cm2
6.2 Seat 10 kg / cm2
7.0 End connection Flanged connection

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 Appendix-IV
Sheet 13 of 13

DATA SHEET FOR CHECK VALVES (NON-RETURN VALVES)

1.0.0 Make POWERGRID Approved make

1.1.0 Type Swing Check Type

1.2.0 Standard followed IS:5312

1.3.0 Rating PN 1.6

1.4.0 Material of construction, Dimensions. As per IS;5312

1.5.0 Inlet Outlet details Flanged

1.6.0 Hydraulic test pressure, kg/cm2

1.6.1 Body 24

1.6.2 Seat 16

TECHNICAL SPECIFICATION, SECTION:FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 APPENDIX -V
Page 1 of 2

VENDOR LIST FOR FIRE PROTECTION PACKAGE

S.No. Equipment/Material Make

1. Pumps KBL/M&P/B&C
(Horizontal Centrifugal)

2. Motors (L.T.) RAJENDRA ELECT.INDIGEC

SIEMENS/ ABB/CROMPTON

3. Diesel Engine Ruston & Hornsby (Greaves)/

KIRLOSKAR OIL ENGINE LTD

4. Air Compressor KGK/ELGI/INGERSOL

RAND

5 Batteries EXIDE/AMCO/AMARA
6. M.S./G.I Pipes JINDAL/PRAKASH/
SAIL/ LLOYD METALS &
ENGINEERS LTD.

7. C. I. Valves H. Sarkar/Venus/Kalpana
(Gate & Check)

8. Gun Metal Valves (Globe) Leader

9. Float operated Gate Valve Levcon/Sigma

10. Deluge Valve ACE Turnkey/H.D. Fire

11. Strainer Grandprix/Jaypee/Multitex/

(Y-Type & Basket Type) Gujarat Otofilt

12. Hume pipe Indian Hume Pipe/Pargate

Concrete Udyog Delhi
13. H. V. Spray Nozzles H.D. Fire/ACE Turnkey

14. Q. B. Detectors H.D Fire/ACE Turnkey

15. Pressure Gauge H. Guru/General Instrument

16. Pressure Switches Indfos/Switzer/Verma Trafag

17. Level Switches Levcon/Sigma

18. Level Indicator Levcon/Sigma

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 APPENDIX -V
Page 2 of 2

S.No. Equipment/Material Make

19. Level Gauge Levcon/Sigma

20. Hydrant Valves & Accessories Sukan/Shah Bhogilal

21. Hoses (Flax Canvas) Jayshree Calcutta/Newage

22. Solenoid Valves AVCON/ROTEX

23. Heat & Smoke Detectors Apollo, U.K. /Pyrotonics /

System Sensor/ Nittan

24. Cables Polycab/PRWE/GEMSCAB/

KEI/PARAMOUNT

25. Fire Extinguishers Nitin/Vijay Fire/Lightex/

Zenith/ Minimax

26. Fire alarm Panels ECD

27. Annunciators Peacon/Piri/Procon

28. Dished Ends Anoop Engg./Motilal/Kanara

29. Local control panels & Suchitra/ Vikas Engg./UNILEC/JASPER/

Annunciation panels. MIKA/ Bose corporation.

30. Response Indicators/Hooters M.C. Engineering Delhi/

Break Glass Units Maths, Bombay/ Mehta &
Associates, Ahmedabad.

TECHNICAL SPECIFICATION, SECTION: FIRE PROTECTION

C/ENGG/SPEC/FP Rev-6
 TECHNICAL SPECIFICATION FOR

AIR CONDITIONING SYSTEM

TABLE OF CONTENTS

Clause No. Description Page No.

1 General 1
2 Air Conditioning System for Control Room Building 1
3 Air conditioning system for switchyard panel rooms. 6

TECHNICAL SPECIFICATION PAGE-0 of 7

SECTION- AIR CONDITIONING
C/ENGG/SPEC/AC R4
 TECHNICAL SPECIFICATION FOR
AIR CONDITIONING SYSTEM

1 GENERAL

1.1 This specification covers supply, installation, testing and

commissioning and handing over to POWERGRID of Air conditioning
system for the control room building and switch-yard panel rooms.

1.2 Air conditioning units for control room building shall be set to
maintain the inside DBT at 24 o C ± 2oC and the air conditioning
system for switch-yard panel rooms shall be set to maintain DBT
inside switch-yard panel rooms below 24oC.

1.3 Controllers shall be provided in Control room and Battery room for
controlling and monitoring the AC units in these rooms as detailed in
clause no.2.3.4.

1.4 Each switch-yard panel room shall be provided with temperature

transducer to monitor the temperature of the panel room. The
Temperature transducer shall have the following specification:

Sensor : Air temperature sensor (indoor use)

Output : 4 to 20mA
Temperature range : -5oC to 60oC
Resolution : 0.1oC
Accuracy : 0.5oC or better.

2 AIR CONDITIONING SYSTEM FOR CONTROL ROOM BUILDING.

2.1 Air conditioning requirement of control room building shall be met

using a combination of following types Air Conditioning units as
required.

a) Ductable Split unit of 8.5TR.

b) Cassette type split AC units of 3TR.
c) High wall type split AC units of 2TR.

2.2 Scope

The scope of the equipment to be furnished and services to be

provided under the contract are outlined hereinafter and the same is
to be read in conjunction with the provision contained in other
sections/ clauses. The scope of the work under the contract shall be

TECHNICAL SPECIFICATION PAGE-1 of 7

SECTION- AIR CONDITIONING
C/ENGG/SPEC/AC R4
 deemed to include all such items, which although are not specifically
mentioned in the bid documents and/or in Bidder's proposal, but are
required to make the equipment/system complete for its safe,
efficient, reliable and trouble free operation.

2.2.1 Required number of Ductable split type AC units of 8.5 TR capacity

with air cooled outdoor condensing unit with semi hermetic/hermetic
compressors including refrigerant pipes, controls, thermostats, filters,
outlet dampers, etc.

2.2.2 Required number of Cassette type split AC units of 3TR capacity

each complete with air cooled outdoor condensing unit having
hermetically sealed compressor unit with cordless remote controller.

2.2.3 Required number of High wall type split AC units of 2TR capacity
each complete with air cooled outdoor condensing unit having
hermetically sealed compressor and high wall type indoor evaporator
unit with cordless remote controller.

2.2.4 Copper refrigerant piping complete with insulation between the

indoor and outdoor units as required.

2.2.5 First charge of refrigerant and oil shall be supplied with the unit.

2.2.6 GSS/Aluminium sheet air distribution ducting for distributing

conditioned dehumidified air along with supply air diffusers and
return air grilles with volume control dampers and necessary splitters
etc., suitable fixtures for grilles/diffusers and supports for ducting
complete with insulation.

2.2.7 Local start/stop facility for local starting/ stopping of all electrical
equipment/ drives.

2.2.8 All instruments and local control panels alongwith controls and
interlock arrangements and accessories as required for safe and
trouble free operation of the units.

2.2.9 PVC drain piping from the indoor units upto the nearest drain point.

2.2.10 Supply and erection of Power and control cable and earthing.

2.2.11 MS Brackets for outdoor condensing units, condensers as required.

2.3 Technical specifications.

2.3.1 Ductable split type AC units.

TECHNICAL SPECIFICATION PAGE-2 of 7

SECTION- AIR CONDITIONING
C/ENGG/SPEC/AC R4
2.3.1.1 Each Split Air conditioner shall have an indoor unit and an outdoor
unit, designed to provide free delivery of conditioned air to the
conditioned space. The indoor unit shall be suitable for mounting on
the ceiling concealed above the false ceiling. Outdoor unit can be
placed on the roof. Each unit shall include a primary source of
refrigeration for cooling and dehumidification, means for circulation
and cleaning air.

2.3.1.2 Cabinet

The cabinets housing the components of indoor units & outdoor units
shall be of heavy gauge sheet steel and suitable for floor
mounting/mounting from ceiling. The access panels shall be of easily
removable type. The entire casing shall be lined with 25mm thick
insulation of totally flame proof type. Suitable drain connection shall
be provided for removal of condensate collected inside a tray under
cooling coil.

2.3.1.3 Compressor

The compressor shall be Semi hermetically/hermetically sealed type

and complete with drive motor. The compressor shall be mounted on
spring inside the lower most section of the unit so that it is easily
accessible for servicing.

2.3.1.4 Condenser

Air cooled condenser of adequate surface area shall be offered. The

air cooled condenser shall be made of copper tubes with external
fins.

2.3.1.5 Air Handling Fan

The air handling fan shall be centrifugal type complete with belt drive
and electric motor.

2.3.1.6 Filter

Pre-filter at the suctions to remove dust particles down to 10 micron

size with 90% efficiency and fine filters to remove dust particles down
to 5 micron size with 99% efficiency at the outlet. All filters shall be of
panel type.

2.3.1.7 Cooling Coil

Cooling coils shall be of direct expansion type and made of heavy

gauge copper with aluminium fins. Rows shall be staggered in the
direction of air flow. Separate tubings from the distributor shall feed
refrigerant uniformly to different sections of the coil.

TECHNICAL SPECIFICATION PAGE-3 of 7

SECTION- AIR CONDITIONING
C/ENGG/SPEC/AC R4
2.3.1.8 Refrigerant Piping

Refrigerant piping shall be of heavy gauge copper to IS:2501 or

IS:1239 heavy class seamless M.S. pipe complete with thermostatic
expansion valve, liquid strainer, dehydrator, liquid line shut off valve,
high and low pressure gauges.

2.3.1.9 Condensate Trays

An adequate method of condensate removal shall be provided.

Condensate tray of adequate size, made of corrosion-resistant
material or suitably treated with corrosion-resistant coating shall be
provided. The tray shall be adequately insulated to avoid
condensation over its external surface.

2.3.1.10 Refrigerant Strainer

A refrigerant strainer shall be provided in the liquid line immediately

before the expansion device.

2.3.1.11 Vibration Isolator

A minimum of six 25 thick neoprene rubber pads shall be supplied for

each unit.

2.3.1.12 Cooling capacity of 8.5TR unit shall not be less than 102000 btu/hr.

2.3.2 Cassette type split AC units.

The Cassette type AC units shall be complete with indoor evaporator

unit, outdoor condensing units and cordless remote control units.

2.3.2.1 Outdoor unit shall comprise of hermetically/ semi hermetically sealed

compressors mounted on vibration isolators, fans and copper tube
aluminium finned coils all assembled in a sheet metal casing. The
casing and the total unit shall be properly treated and shall be
weatherproof type. They shall be compact in size and shall have
horizontal discharge of air.

2.3.2.2 Indoor units shall be of 4-way, ceiling mounted cassette type. The
indoor unit shall be compact and shall have elegant appearance.
They shall have low noise centrifugal blowers driven by suitable
motors and copper tube aluminium finned cooling coils. Removable
and washable polypropylene filters shall be provided. They shall be
complete with multi function cordless remote control unit with special
features like programmable timer, sleep mode etc.

2.3.2.3 Cooling capacity of 3TR AC units shall not be less than 36000btu/hr.

TECHNICAL SPECIFICATION PAGE-4 of 7

SECTION- AIR CONDITIONING
C/ENGG/SPEC/AC R4
 and their EER shall not be less than 2.7.

2.3.3 High wall type split AC units

2.3.3.1 The split AC units shall be complete with indoor evaporator unit,
outdoor condensing units and cordless remote control units.

2.3.3.2 Outdoor unit shall comprise of hermetically/semi hermetically sealed

compressors mounted on vibration isolators, propeller type axial flow
fans and copper tube aluminium finned coils all assembled in a sheet
metal casing. The casing and the total unit shall be properly treated
and shall be weatherproof type. They shall be compact in size and
shall have horizontal discharge of air.

2.3.3.3 The indoor units shall be high wall type. The indoor unit shall be
compact and shall have elegant appearance. They shall have low
noise centrifugal blowers driven by suitable motors and copper tube
aluminium finned cooling coils. Removable and washable
polypropylene filters shall be provided. They shall be complete with
multi function cordless remote control unit with special features like
programmable timer, sleep mode and soft dry mode etc.

2.3.3.4 Cooling capacity of 2TR AC units shall not be less than 22000btu/hr.
and shall have energy efficiency rating of 3star or above.

2.3.4 Controllers shall be provided in Control room and Battery room, one
controller for each room, to control and monitoring of AC units and
shall have the following facilities;

• Standby units shall come in to operation automatically whenthe

running main unit fails
• Main and standby units shall be changed over periodically which
shall be finalised during detailed engineering.
• Following alarms shall be provided:

a. Compressor On/OFF condition of each unit

b. Compressor failure of each unit
c. Power OFF to AC unit
d. High temperature in room.

2.4 The Split AC units shall be of Carrier, Voltas, Blue Star, Hitachi,
Daikin, LG, National, O’General or Samsung make.

2.5 Warranty

All compressors shall have minimum 5 years Warranty from the date

TECHNICAL SPECIFICATION PAGE-5 of 7

SECTION- AIR CONDITIONING
C/ENGG/SPEC/AC R4
 of commissioning.

3 AIR CONDITIONING SYSTEM FOR SWITCHYARD PANEL

ROOMS.

3.1 Air conditioning system shall be provided in the switchyard panel

rooms used for housing control and protection panels. These panel
rooms will be located in the switchyard area and generally
unmanned. Therefore, the air-conditioning system shall be rugged,
reliable, maintenance free and designed for long life.

3.2 Air conditioning system is required for maintaining the temperature

below 24oC for sub-station control and protection panels. This shall
be achieved using Packaged AC units with free cooling arrangement
as per clause 3.4. The system shall be designed for 24 Hours, 365
Days of the year operation to maintain the inside Switchyard panel
rooms temperature for proper operation of the critical equipment.

3.3 Number and rating of the units for each panel room shall be as
follows:

i. For panel room of length not more than 6 metres.: 2 nos. (1

working + 1 standby) AC units of 2TR capacity each.
ii. For panel room of length more than 6 metres.: 2 nos. (1 working
+ 1 standby) AC units of 3TR capacity each.

3.4 Technical specification for Packaged AC units with Free

Cooling.

3.4.1 Each AC unit shall be complete with air cooled condensing unit with
scroll compressor, direct expansion type evapourating unit and
microprocessor controller. AC units shall be provided with free
cooling arrangement. In free cooling mode, the refrigerant cycle of
AC unit shall be switched off and outside air (after filtration) shall be
circulated inside the conditioned space through the operation of
dampers provided with suitable sensors. This mode shall come into
operation in the following conditions;

i. When the ambient temperature is below a preset value, which is to

be decided during detailed engineering.
ii. In case of failure of refrigeration system of both the units.

3.4.2 One of the air-conditioners shall be running at a time and shall

maintain the required temperature. On failure of the running air-
conditioner, the other air-conditioner shall start automatically. To
ensure longer life of the system and to keep the AC units healthy,
change over of the standby unit shall be done periodically through

TECHNICAL SPECIFICATION PAGE-6 of 7

SECTION- AIR CONDITIONING
C/ENGG/SPEC/AC R4
 the controller. Further, if inside temperature of the room reaches
35oC due to any emergency condition, the standby air-conditioner
shall also start running to maintain the temperature less than 24oC
and system shall generate an alarm for such a situation. After
achieving this temperature, the standby unit shall again shut off.
However any hunting situation shall be reported. No heating or
humidification is envisaged for the air conditioning system inside the
Switchyard panel rooms.

3.4.3 Packaged AC units with free cooling shall be designed for high
sensitive cooling with sensible heat factor of 90% or above.

3.4.4 Each air conditioner shall be completely self-contained. All

components of the units shall be enclosed in a powder coated
cabinet. The unit shall be assembled, wired, piped, charged with
refrigerant and fully factory tested as a system to ensure trouble free
installation and start up. Suitable isolation or other by-passing
arrangement shall be provided such that any unit/component could
be maintained/ repaired without affecting the running standby unit.

3.4.5 The AC units shall be mounted on the wall and the maintenance of
unit shall be possible from outside the Switchyard panel room.

3.4.6 Required Features of Various Components

The compressor shall be very reliable, trouble free and long life i.e.
hermetically sealed Scroll type of reputed make suitable for
continuous operation. Compressor should be installed on vibration
isolated mountings or manufacturer’s recommended approved
mounting. Valve shall be provided for charging/topping up of
refrigerant. The bidder shall furnish details of their compressor
indicating the MTBF, life of compressor and continuous run time of
compressor without failure. The contractor shall also furnish details of
all accessories i.e. refrigeration system, evaporator coil, condenser
coil, evaporator blower, filter, cabinet, indoor supply and return grill
etc. during detailed engineering.

3.5 Warranty

All compressors shall have minimum 5 years Warranty from the date
of commissioning

3.6 For owner’s remote monitoring purposes, necessary digital inputs

shall be provided for ‘ON’ and ‘OFF’ condition of each compressor.

TECHNICAL SPECIFICATION PAGE-7 of 7

SECTION- AIR CONDITIONING
C/ENGG/SPEC/AC R4
 TECHNICAL SPECIFICATION
SECTION-SWITCHYARD ERECTION

पावर ग्रिड कापोरे शन आफ इन्डडया लऱलिटे ड

(भारत सरकार का उद्यम)
Power Grid Corporation of India Limited
(A Government of India Enterprises)

Document No.: C/ENGG/SPEC/SE (Rev.10) April 2016

 TECHNICAL SPECIFICATION

SECTION- SWITCHYARD ERECTION

REVISION - 10
 SECTION-(SE)
SWITCHYARD ERECTION

CONTENTS

Clause No Particulars Page No.

1.0 General 1
2.0 String Insulators & Hardware 1
3.0 AAC/ACSR Conductor 12
4.0 Galvanised Steel Earth Wire 15
5.0 Aluminium Tube 17
6.0 Earthing Conductors 18
7.0 Spacers 19
8.0 Bus Post Insulators 20
9.0 Earthing 23
10.0 Bus Bars 28
11.0 Bay Equipment 28
12.0 Lightning Protection 30
13.0 Equipment Erection Details 30
14.0 Storage 31
15.0 Cabling Material 31
16.0 Directly Buried Cables 33
17.0 Installation Of Cables 33
18.0 Junction Box 38
19.0 Testing And Commissioning 38
Annexure-A Testing Procedure for ACSR MOOSE conductor 40
Annexure-B Testing Procedure for Galvanised Steel Earthwire 42
Annexure-C Corona and Radio Interference Voltage (RIV) Test 44
Annexure-D Short Circuit Forces And Spacer Span for Gantry Str. 46
Annexure-E Standard Technical Data Sheets for Conductors, 48
Earthwire and Aluminium pipe
 SECTION-(SE)
SWITCHYARD ERECTION

1.0 GENERAL

This section covers erection of all equipment such as circuit breakers,

isolators, current transformers, voltage transformers, surge arresters etc.
This section also covers design, engineering, manufacture, testing at
works, supply, insurance, handling, storage, erection, testing and
commissioning of supply & erection of following items.

- String insulators and hardware

- AAC / ACSR conductor

- Galvanised Steel Earthwire

- Aluminium Tube

- Spacers

- Bus post insulators

- Earthing & Earthing materials

- Lightning protection materials

- Cabling material

- Other items

2.0 String Insulators & Hardware

The insulators for suspension and tension strings shall conform to IEC-60383
and long rod insulators shall conform to IEC-60433. Insulator hardware shall
conform to IS:2486. Composite long rod polymer insulator shall conform to
IEC:61109. Further, the contractor shall supply insulators as per details
mentioned below:

A. Tension Insulator String

Sl. No. System Voltage Type

1. 765kV, 400kV, 220kV & 132kV (for Composite Long Rod
all substations in coastal, pollution Polymer with 31mm/kV
affected areas as identified in Creepage
Section-Project and for all
substations in Northern Region)
2. 765kV, 400kV, 220kV & 132kV (for Composite Long Rod
substations not covered in 1. above) Polymer/Porcelain/Glass
with 31mm/kV Creepage

B. Suspension Insulator String

Sl. No. System Voltage Type

1. 765kV, 400kV, 220kV & 132kV (for Composite Long Rod
all substations) Polymer with 31mm/kV
Creepage

Technical Specification, Section : SE Page - 1 of 58

C / ENGG / SPEC / ERC REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

2.1 Construction Features (Porcelain & Glass Insulators)

2.1.1 Porcelain insulators

a) Suspension and tension insulators shall be wet process porcelain with ball
and socket connection. Insulators shall be interchangeable and shall be
suitable for forming either suspension or tension strings. Each insulator
shall have rated strength, manufacturer‘s logo, month & year of
manufacturing markings on porcelain printed and applied before firing.

b) Porcelain used in insulator manufacturing shall be homogeneous, free from

laminations, cavities and other flaws or imperfections that might affect the
mechanical or dielectric quality and shall be thoroughly vitrified, tough and
impervious to moisture.

c) Glazing of the porcelain shall be of uniform brown colour, free from blisters,
burrs and other similar defects.

2.1.2 Glass insulators

It shall be made of toughened glass. Glass used for the shells shall be sound,
free from defects, flows bubbles, inclusions, etc and be of uniform toughness
over its entire surface. All exposed glass surfaces shall be smooth.

2.1.2.1 When operating at normal rated voltage, there shall be no electric discharge
between conductor and insulator which would cause corrosion or damage to
conductors or insulators by the formation of substances due to chemical action.

2.1.2.2 The design of the insulator shall be such that stresses due to expansion and
contraction in any part of the insulator shall not lead to deterioration. All ferrous
parts shall be hot dip galvanized in accordance with the latest edition of IS: 2629.
The zinc used for galvanizing shall be of grade Zn-99.95 as per IS-209. The zinc
coating shall be uniform, adherent, smooth, reasonably bright, continuous and
free from imperfections such as flux, ash, rust stains bulky white deposits and
blisters.

2.1.2.3 Contractor shall make available data on all the essential features of design
including the method of assembly of discs and metal parts, number of discs per
insulator string, the manner in which mechanical stresses are transmitted through
discs to adjacent parts, provision for meeting expansion stresses, results of
corona and thermal shock tests, recommended working strength and any special
design or arrangement employed to increase life under service conditions.

2.1.3 Hardware Fittings

2.1.3.1 Clamps for insulator strings and Corona Control rings shall be of aluminium alloy
as stipulated for clamps and connectors.

2.1.3.2 Insulator hardware shall be of forged steel. Malleable cast iron shall not be
accepted except for insulator disc cap. The surface of hardware must be clean,
smooth, without cuts, abrasion or projections. No part shall be subjected to
excessive localized pressure. The metal parts shall not produce any noise
generating corona under operating conditions.

2.1.3.3 The tension Insulator hardware assembly shall be designed for minimum 21000
kg tensile load for 765kV and minimum 12000 kg tensile load for hardware

Technical Specification, Section : SE Page - 2 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

assembly below 765kV. Earth wire tension clamp shall be designed for minimum
1000 kg tensile load with a factor of safety of two (2).

2.1.3.4 The tension string assemblies shall be supplied alongwith suitable turn buckle.
Sag compensation springs if required may also be provided.

2.1.3.5 All hardware shall be bolted type.

2.2 Tests
In accordance with the stipulations of the specification, the suspension and
tension strings, insulator and hardware shall be subjected to the following type
tests, acceptance tests and routine tests:

2.2.1 Type Tests on Insulator Strings: The test reports for following type tests shall
be submitted for approval as per clause 9.0 of Section - GTR.

a) Power frequency voltage withstand test with corona control rings (if
applicable) under wet condition as per IEC- 60383.

b) Switching surge voltage withstand test [400 kV and above class only]
under wet condition as per IEC-60383.

c) Lightning Impulse voltage withstand test with corona control rings under
dry condition as per IEC-60383

d) Voltage distribution test (Dry) [applicable for disc insulator string only]

The voltage across each insulator unit shall be measured by sphere gap
method. The result obtained shall be converted into percentage. The
voltage across any disc shall not exceed 6.5% for 765 kV suspension and
tension insulator strings, 9% and 10% for 400KV suspension string and
tension insulator string respectively, 13% for 220KV suspension and
tension insulator strings, 20% and 22% for 132KV suspension and
tension insulator strings respectively.

e) Corona Extinction Voltage test (Dry) [220kV and above class only]

The sample assembly when subjected to power frequency voltage shall

have a corona extinction voltage as specified at clause 2.3.2. There
shall be no evidence of Corona on any part of the sample. The
atmospheric condition during testing shall be recorded and the test results
shall be accordingly corrected with suitable correction factor as stipulated
in IEC 60383.

f) RIV Test (Dry) [220kV and above class only]

Under the conditions as specified under (e) above the insulator string
alongwith complete hardware fittings shall have a radio interference
voltage as specified in clause 2.3.2 of this section. The test procedure
shall be in accordance with IS 8263/IEC 60437.

g) Mechanical strength test: The test shall be carried out as per following
procedure.

Technical Specification, Section : SE Page - 3 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

The complete insulator string alongwith its hardware fitting excluding

arcing horn, corona control ring, grading ring, tension/suspension clamps
shall be subjected to a load equal to 50% of the specified minimum
ultimate tensile strength (UTS) which shall be increased at a steady rate
to 67% of the minimum UTS specified. The load shall be held for five
minutes and then removed. After removal of the load, the string
components shall not show any visual deformation and it shall be
possible to dismantle them by hand. Hand tools may be used to remove
cotter pins and loosen the nuts initially. The string shall then be
reassembled and loaded to 50% of UTS and the load shall be further
increased at a steady rate till the specified minimum UTS and held for
one minute. No fracture should occur during this period. The applied load
shall then be increased until the failing load is reached and the value
recorded.

2.2.2 Type Tests on String Insulator Units

Type test report for Thermal Mechanical Performance tests (applicable for
porcelain type insulators) as per IEC-60575, Clause 3 shall be submitted for
approval as per clause 9.2 of Section - GTR.

2.2.3 Acceptance Tests for Insulators:

a) Visual examination as per IEC-60383/ IEC-61109 clause no. 7.2 (for

composite long rod insulators).

b) Verification of Dimensions as per IEC- 60383.

c) Temperature cycle test as per IEC- 60383.

d) Puncture Test as per IEC-60383 (Applicable only for porcelain insulators).

e) Galvanizing Test as per IEC- 60383.

f) Mechanical performance test as per IEC-60575 Cl. 4 / IEC-61109 clause

no. 7.2 (for composite long rod insulators).

g) Test on locking device for ball and socket coupling as per IEC-60372(2).

h) Porosity test as per IEC- 60383 (Applicable only for porcelain insulators).

i) Thermal shock test as per IEC-60383 (Applicable only for glass

insulators)

2.2.4 Acceptance Test on Hardware Fitting

a) Visual Examination as per Cl. 5.10 of IS: 2486 (Part-I).

b) Verification of Dimensions as per Cl. 5.8 of IS:2486 (Part-I)

c) Galvanising/Electroplating tests as per Cl. 5.9 of IS:2486 (Part-I).

d) Slip strength test as per Cl 5.4 of IS-2486 (part-I)

e) Shore hardness test by the Elastometer

Technical Specification, Section : SE Page - 4 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

f) Mechanical strength test for each component (including corona control

rings and arcing horns).

The load shall be so applied that the component is stressed in the same
way as it would be in actual service and the procedure as given in
2.2.1.(g) above should be followed.

g) Test on locking devices for ball and socket coupling as per IEC -60372(2).

2.2.5 Routine Test on Insulator

a) Visual Inspection as per IEC-60383

b) Mechanical Routine Test as per IEC-60383

c) Electrical Routine Test as per IEC-60383

2.2.6 Routine Test on hardware Fittings

a) Visual examination as per Cl 5.10 of IS:2486 (Part-I)

b) Mechanical strength Test as per Cl. 5.11 of IS:2486 (Part-I)

2.2.7 Test during manufacture on all Components as applicable on insulator

a) Chemical analysis of zinc used for galvanising: Samples taken from the
zinc ingot shall be chemically analyzed as per IS: 209. The purity of zinc
shall not be less than 99.95%.

b) Chemical Analysis, mechanical hardness tests and magnetic particle

inspection for malleable casting:

The chemical analysis, hardness tests and magnetic particle inspection

for malleable casting will be as per the internationally recognized
procedures for these tests. The sampling will be based on heat number
and heat treatment batch. The details regarding tests will be as discussed
and mutually agreed to by the Contractor and Employer in Quality
Assurance Program.

2.2.8 Test during manufacture on all components as applicable on hardware

fittings:

a) Chemical analysis of zinc used for galvanising:

Samples taken from the zinc ingot shall be chemically analyzed as per
IS:209. The purity of zinc shall not be less than 99.95%

b) Chemical analysis, hardness tests and magnetic particle for Forgings/

fabricated hardware:

The chemical analysis, hardness tests and magnetic particle inspection

for forgings/fabricated hardware will be as per the internationally
recognized procedures for these tests. The sampling will be based on
heat number and heat treatment batch. The details regarding tests will be
as discussed and mutually agreed to by the Contractor and Employer in
Quality Assurance Programme.

Technical Specification, Section : SE Page - 5 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

2.3 Guaranteed technical Particular For

2.3.1 Disc Insulators

Sl. No. Description For 765kV For

400/220/132kV
a) Type of insulators Anti Fog type Anti Fog type
b) Physical Size of insulator units
(i) Diameter of Disc As per IEC As per IEC
(ii) Ball to ball spacing between 170 mm 145 mm
discs
c) Electro mechanical strength 210 kN 120 kN
d) Minimum Creepage distance of 460 mm 430 mm
individual insulator units
e) Markings
i) For Porcelain insulators Markings on Markings on
porcelain porcelain
ii) For toughened glass insulators Markings shall Markings shall
be done on be done on
initial parts initial parts
f) Power frequency puncture 1.3 times the 1.3 times the
withstand voltage actual wet actual wet
flashover flashover
voltage voltage

2.3.2 INSULATOR STRING

Sl. Description 765 kV 400kV 220kV 132kV

No.
a) Power frequency withstand 870 680 460 275
voltage of the complete string
with corona control ring (wet)
– KV rms
b) Lightning impulse withstand ± 2100 ± 1550 ± 1050 ± 650
Voltage of string with corona
control rings (dry) - kVp
c) Switching surge withstand ± 1550 ± 1050 NA NA
voltage of string with corona
control rings (wet) - kVp
d) Minimum corona extinction 508 320 156 NA
voltage level of string with
Corona Control rings (dry) - kV
rms
e) Maximum RIV level in micro 1000 1000 1000 NA
volts of string with Corona (Max) (Max) (Max)
Control rings across 300 Ohms at 320
at 508 at 156
resistor at 1 MHz kV
kV kV
f) Minimum total creepage 24800 13020 7595 4495
distance of the insulator
string (mm)
g) Minimum no. of discs per 54 31 18 11
string (for tension string if
applicable)

Technical Specification, Section : SE Page - 6 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

h) Electromechanical strength of 210 120 120 120

Insulator Unit. ( KN)

For tension application:-

Double insulator strings for 765kV, 400kV, 220kV and single insulator strings for
132 kV systems shall be used.

For suspension application:-

V-type polymer insulator string shall be used for 765kV system and single
suspension polymer insulator string shall be used for 400kV, 220kV & 132 kV
systems.

2.4 COMPOSITE LONG ROD POLYMER INSULATOR

Bidder shall offer composite long rod polymer insulators with suitable hardware
fittings.

2.4.1 Details of Composite Long Rod Insulators

2.4.1.1 Insulators shall have sheds of the ―open aerodynamic profile without any under
ribs‖ with good self-cleaning properties. Insulator shed profile, spacing projection
etc. shall be strictly in accordance with the recommendation of IEC-60815.

2.4.1.2 Ball and socket shall be 20mm designation for 120kN & 24mm designation for
210kN Insulators in accordance with the standard dimensions stated in
IEC:60120/ IS:2486 (Part-II). Insulators shall be interchangeable and shall be
suitable for forming either suspension or tension strings. Each insulator shall
have laser markings on housings for manufacturer‘s name, month & year of
manufacturing, rated strength markings on each composite insulator rod unit. No
negative tolerance shall be applicable to creepage distance of composite
insulators

2.4.1.3 All ferrous parts shall be hot dip galvanized as per Section-GTR with
minimum weight of zinc coating as 610 gm/sq.m for normal area and 900
gm/sq.m for coastal area as specified in Section-Project.

2.4.2 Material

2.4.2.1 Core

It shall be a glass-fiber reinforced (FRP) epoxy resin rod of high strength. The rod
shall be resistant to hydrolysis. The rod shall be of electrical grade corrosion
resistant (ECR), boron free glass and shall exhibit both high electrical integrity
and high resistance to acid corrosion.

2.4.2.2 Housing & Weathersheds

The FRP rod shall be covered by a sheath of a silicone rubber compound of a

thickness of minimum 5mm. The housing & weathersheds should have silicon
content of minimum 30% by weight. It should protect the FRP rod against
environmental influences, external pollution and humidity. It shall be extruded or
directly molded on the core. The interface between the housing and the core
must be uniform and without voids. The strength of the bond shall be greater
than the tearing strength of the polymer. The manufacturer shall follow non-

Technical Specification, Section : SE Page - 7 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

destructive technique (N.D.T.) to check the quality of jointing of the housing

interface with the core.

The weathersheds of the insulators shall be of alternate shed profile. The

weathersheds shall be vulcanized to the sheath (extrusion process) or molded as
part of the sheath (injection moulding process) and free from imperfections. The
vulcanization for extrusion process shall be at high temperature and for injection
moulding shall be at high temperature & high pressure. Any seams/ burrs
protruding axially along the insulator, resulting from the injection moulding
process shall be removed completely without causing any damage to the
housing. The track resistance of housing and shed material shall be class 1A4.5
according to IEC60587. The strength of the weathershed to sheath interface shall
be greater than the tearing strength of the polymer. The composite insulator shall
be capable of high pressure washing.

2.4.2.3 End Fittings

End fittings transmit the mechanical load to the core. They shall be made of
malleable cast iron/ spheroidal graphite or forged steel. They shall be connected
to the rod by means of a controlled compression technique. The manufacturer
shall have in-process Acoustic emission arrangement or some other
arrangement to ensure that there is no damage to the core during crimping. This
verification shall be in-process and done on each insulator. The system of
attachment of end fitting to the rod shall provide superior sealing performance
between housing and metal connection. The gap between fitting and sheath shall
be sealed by a flexible silicone rubber compound. The sealing shall stick to both
housing and metal end fitting. The sealing must be humidity proof and durable
with time.

End fittings shall have suitable provisions for fixing grading rings at the correct
position as per design requirements.

2.4.2.4 Grading Rings

Grading rings shall be used at both ends of each composite insulator unit for
reducing the voltage gradient on and within the insulator and to reduce TV noise
to acceptable levels. The size and placement of the metallic grading rings shall
be designed to eliminate dry band arcing/corona cutting/ exceeding of
permissible electrical stress of material. The insulator supplier shall furnish
design calculations using appropriate electric field software showing electric field
at surface of housing, inside housing & core and at the interface of housing and
metal fittings with the proposed placement and design of corona rings. Grading
rings shall be capable of installation and removal with hot line tools without
disassembling any other part of the insulator assembly.

The design & supply of grading rings shall be in the scope of the composite
insulator supplier.

2.4.3 Tests

2.4.3.1 Type Tests

The test reports for following type tests on long rod units, components, materials
or complete strings shall be submitted for approval as per clause 9.2 of Section -
GTR.

Technical Specification, Section : SE Page - 8 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

2.4.3.1.1 On the complete composite Long Rod Polymer Insulator String with
Hardware Fittings:-

a) Power frequency voltage withstand test with corona control rings/grading ring
and arcing horns (if provided) under wet condition as per IEC:60383-1993.

b) Switching surge voltage withstand test under wet condition as per IEC:60383-
1993.

c) Impulse voltage withstand test under dry condition as per IEC:60383-1993

d) Corona and RIV test under dry condition. [132kV and above class only]

The sample assembly when subjected to power frequency voltage shall have
a corona extinction voltage as specified in clause 2.3.2 of this section There
shall be no evidence of Corona on any part of the sample. The atmospheric
condition during testing shall be recorded and the test results shall be
accordingly corrected with suitable correction factor as stipulated in IEC
60383.

Under the conditions as specified above the insulator string alongwith

complete hardware fittings shall have a radio interference voltage level as
specified at specified in clause 2.3.2 of this section. The test procedure shall
be in accordance with IS 8263/IEC-60437.

e) Mechanical Strength test: The test shall be carried out as per following
procedure.

The complete insulator string alongwith its hardware fitting excluding arcing
horn, corona control ring, grading ring, tension/suspension clamps shall be
subjected to a load equal to 50% of the specified minimum ultimate tensile
strength (UTS) which shall be increased at a steady rate to 67% of the
minimum UTS specified. The load shall be held for five minutes and then
removed. After removal of the load, the string components shall not show any
visual deformation and it shall be possible to dismantle them by hand. Hand
tools may be used to remove cotter pins and loosen the nuts initially. The
string shall then be reassembled and loaded to 50% of UTS and the load
shall be further increased at a steady rate till the specified minimum UTS and
held for one minute. No fracture should occur during this period. The applied
load shall then be increased until the failing load is reached and the value
recorded.

f) Salt-fog pollution withstand test as per IEC: 60507. The salinity level for
composite long rod insulators shall be 160 Kg/m3 NaCl.

2.4.3.1.2 On Composite Polymer Insulator Units

a) Tests on interfaces and connections of metal fittings as per IEC: 61109-2008.

b) Assembled core load time test as per IEC: 61109-2008.

c) Damage limit proof test and test of tightness of interface between end firings
and insulator housing as per IEC: 61109-2008

d) High Pressure washing test

Technical Specification, Section : SE Page - 9 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

The washing of a complete insulator of each E&M rating is to be carried out

at 3800 kPa with nozzles of 6 mm diameter at a distance of 3m from nozzles
to the insulator, the washing shall be carried out for 10minutes. There shall
be no damage to the sheath or metal fitting to housing interface. The
verification shall be done by 1 minute wet power frequency withstand test at
680kV r.m.s for 400KV.

e) Brittle fracture resistance test

The test arrangement shall be according to Damage limit proof test with
simultaneous application of 1N-HNO3 acid directly in contact with naked FRP
rod. The contact length of acid shall not be less than 40mm and thickness
around the core not less than 10mm.The rod shall withstand 80% of SML for
96 hours.

f) Dye penetration test as per IEC: 61109-2008

g) Water diffusion test as per IEC: 61109-2008

h) Tracking and erosion test as per IEC: 61109-2008.

i) Hardness test as per IEC: 61109-2008.

j) Accelerated weathering test as per IEC: 61109-2008.

k) Flammability test as per IEC: 61109-2008.

l) Silicone content test

Minimum content of silicone shall be 30% and the same shall be verified
through FT-IR spectroscopy & TGA analysis or any other approved/
acceptable method.

m) Recovery of Hydrophobicity test

1. The surface of selected samples shall be cleaned with isopropyl alcohol.

Allow the surface to dry and spray with water. Record the HC classification.
Dry the sample surface.

2. Treat the surface with corona discharges to destroy the hydrophobicity.

This can be done utilizing a high frequency corona tester, Holding the
electrode approximately 3mm from the sample surface, slowly move the
electrode over an area approximately 1‖ x 1‖. Continue treating this area
for 2 – 3 minutes, operating the tester at maximum output.

3. Immediately after the corona treatment, spray the surface with water and
record the HC classification. The surface should be hydrophilic, with an HC
value of 6 or 7. If not, dry the surface and repeat the corona treatment for a
longer time until an HC of 6 or 7 is obtained. Dry the sample surface.

4. Allow the sample to recover and repeat the hydrophobicity measurement at

several time intervals. Silicone rubber should recover to HC 1 – HC 2 within
24 to 48 hours, depending on the material and the intensity of the corona
treatment.

n) Torsion test

Technical Specification, Section : SE Page - 10 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

Three complete insulators of each electrical and mechanical rating shall be

subjected to a torsional load of 55Nm. The torsional strength test shall be
made with test specimen adequately secured to the testing machine. The
torsional load shall be applied to the test specimen through a torque member
so constructed that the test specimen is not subjected to any cantilever
stress. The insulator after torsion test must pass the Dye Penetration Test as
per IEC 61109.

o) Accelerated ageing test of 5000hrs as described in appendix-C of IEC 61109

or Test at multiple stresses of 5000 hrs as described in Annex-B of IEC -
62217

2.4.3.2 Acceptance Tests:

For Composite Long Rod Polymer Insulators

a. Verification of dimensions IEC : 61109-2008

b. Galvanizing test IEC : 60383
c. Verification of end fittings IEC : 61109-2008
d. Recovery of Hydrophobicity As per Cl. 2.4.3.1.2.m)
above
e. Verification of tightness of interface IEC : 61109-2008
between end fittings and insulator
housing and of specified mechanical load
f. Silicone content test As per Cl. 2.4.3.1.2.l)
above
g. Brittle fracture resistance test As per Cl. 2.4.3.1.2.e)
above
h. Dye penetration test IEC : 61109-2008
i. Water diffusion test IEC : 61109-2008

In the event of failure of the sample to satisfy the acceptance test(s) specified in
2.4.3.2 above, the re-test procedure shall be as per IEC 61109.

2.4.3.3 Routine Tests

For Composite Long Rod Polymer Insulator Units

a) Visual Examination As per IEC:61109-2008
b) Mechanical routine test As per IEC:61109 -2008

2.4.4 Guaranteed Technical Particulars for Composite Long Rod Polymer

Insulators
The technical parameters for composite long rod polymer insulator string
shall be same of the insulator string specified in clause 2.3.2 of this
section.

Technical Specification, Section : SE Page - 11 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

3.0 AAC / ACSR CONDUCTOR

3.1 Details of AAC Conductor

3.1.1 The Conductor shall conform to IEC: 61089/IS: 398 (Part V) - 1992 except where
otherwise specified herein.

The contractor shall supply the conductor as per the standard guaranteed technical
particulars enclosed in Annexure-E of the technical specification, Section –
Switchyard Erection and separate approval for guaranteed technical particulars is
not required during detailed engineering.

3.2 Details of ACSR Conductor

3.2.1 The Conductor shall conform to IEC: 61089/IS: 398 (Part V) - 1992 except where
otherwise specified herein.

3.2.2 The details of the ACSR Bersimis, ACSR Moose, ACSR Zebra and ACSR Panther
conductors shall be as per the standard guaranteed technical particulars enclosed in
Annexure-E of the technical specification, Section – Switchyard Erection and
separate approval for guaranteed technical particulars is not required during
detailed engineering.

3.3 Workmanship

3.3.1 The finished conductor shall be smooth, compact, uniform and free from all
imperfections including kinks (protrusion of wires), wire cross over, over riding,
looseness (wire being dislocated by finger/hand pressure and/or unusual bangle
noise on tapping), material inclusions, white rust, powder formation or black spot (on
account of reaction with trapped rain water etc.), dirt, grit etc.

3.3.2 All the Aluminium and steel strands shall be smooth, uniform and free from all
imperfections, such as spills and splits, diemarks, scratches, abrasions, etc., after
drawing.

3.3.3 The steel strands shall be hot dip galvanised and shall have a minimum zinc coating
as indicated in the guaranteed technical particulars. The zinc coating shall be
smooth, continuous and of uniform thickness, free from imperfections and shall
withstand minimum three dips in standard Preece test. The steel wire rods shall be of
such quality and purity that, when drawn to the size of the strands specified and
coated with zinc, the finished strands and the individual wires shall be of uniform
quality and have the same properties and characteristics as prescribed in IEC:
60888.

3.3.4 The steel strands shall be preformed and post formed in order to prevent spreading
of strands in the event of cutting of composite core wire. Care shall be taken to
avoid, damages to galvanisation during pre-forming and post-forming operation.

3.4 Joints in Wires

3.4.1 Aluminium Wires

3.4.1.1 During stranding, no aluminium wire welds shall be made for the purpose of
achieving the required conductor length.

Technical Specification, Section : SE Page - 12 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

3.4.1.2 No joints shall be permitted in the individual wires in the outer most layer of the
finished conductor. However joints are permitted in the inner layer of the conductor
unavoidably broken during stranding, provided such breaks are not associated with
either inherently defective wire or with the use of short lengths of aluminium wires.
Such joints shall not be more than four (4) per conductor length and shall not be
closer than 15 meters from joint in the same wire or in any other aluminium wire of
the completed conductor.

3.4.1.3 Joints shall be made by cold pressure butt welding and shall withstand a stress of
not less than the breaking strength of individual strand guaranteed.

3.4.2 Steel Wires

There shall be no joint of any kind in the finished wire used for the manufacturing
of the strand. There shall also be no strand joints or strand splices in any length of
the completed stranded steel core of the conductor.

3.5 Tolerances

The manufacturing tolerances to the extent indicated in the guaranteed technical

particulars shall be permitted in the diameter of individual aluminium and steel
strands and lay-ratio of the conductor.

3.6 Materials

3.6.1 Aluminium

The aluminium strands shall be hard drawn from electrolytic aluminium rods having
purity not less than 99.5% and a copper content not exceeding 0.04%. They shall
have the same properties and characteristics as prescribed in IEC:60889.

3.6.2 Steel

The steel wire strands shall be drawn from high carbon steel wire rods produced by
either the acid or the basic open-hearth process, the electric furnace process, or the
basic oxygen process and shall conform to the chemical composition indicated in the
guaranteed technical particulars.

The Steel wire strands shall have the same properties and characteristics as
prescribed for regular strength steel wire in IEC: 60888.

3.6.3 Zinc

The zinc used for galvanising shall be electrolytic High Grade Zinc of 99.95% purity.
It shall conform to and satisfy all the requirements of IS:209 -1979.

3.7 Standard Length

3.7.1 The conductor shall be supplied as required. No joint shall be allowed within a single
span of stringing, jumpers and equipment interconnection.

3.8 Tests:

3.8.1 The following type, acceptance & routine tests and tests during manufacturing shall
be carried out on the conductor.

Technical Specification, Section : SE Page - 13 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

3.8.1.1 Type Tests

In accordance with the stipulation of specification, the following type tests reports of
the conductor shall be submitted for approval as per clause 9.2 of Section -GTR.

a) UTS test on stranded )

conductor. )
)
b) Corona extinction ) As per Annexure-A
voltage test (dry) )
)
(c) Radio Interference )
voltage test (dry) )
)
(d) DC resistance test )
on stranded conductor )

3.8.1.2 Acceptance Tests

a) Visual check for joints, )

scratches etc. and ) As per Annexure - A
lengths of conductor )

b) Dimensional check on )
steel and aluminium )
strands )
)
c) Check for lay ratios ) -do-
of various layers )
)
d) Galvanising test on steel )
strands )
)
e) Torsion and Elongation )
test on steel strands )

f) Breaking load test on )

steel and aluminium )
strands )
)
g) Wrap test on steel and ) As per IEC:60888 & 60889
aluminium strands )

h) DC resistance test on ) As per IEC:60889

aluminium strands )

i) UTS test on welded ) As per Annexure - A

joint of aluminium )
strands )
NOTE:

All the above tests except test mentioned at (a) shall be carried out on aluminium
and steel strands after stranding only.

Technical Specification, Section : SE Page - 14 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

3.8.1.3 Routine Tests

a) Check to ensure that the joints are as per specification.

b) Check that there are no cuts, fins etc. on the strands.

c) All acceptance tests as mentioned above to be carried out on each

coil/drum (as applicable).

3.8.1.4 Tests During Manufacture

a) Chemical analysis of )
zinc used for galvanising )
)
b) Chemical analysis of )
aluminium used for ) As per Annexure - A
making aluminium strands )
)
c) Chemical analysis of )
steel used for making )
steel strands )

4.0 Galvanised Steel Earth wire

4.1 Details of Earth wire
4.1.1 The galvanised steel earth wire shall generally conform to the specification of ACSR
core wire as mentioned in IEC:60888/IS: 398 (Part-II)-1976 except where otherwise
specified herein.
The contractor shall supply the earthwire as per the standard guaranteed technical
particulars enclosed in Annexure-E of the technical specification, Section –
Switchyard Erection and separate approval for guaranteed technical particulars is
not required during detailed engineering.

4.2 Workmanship
4.2.1 All steel strands shall be smooth, uniform and free from all imperfections, such as
spills and splits, die marks, scratches, abrasions and kinks after drawing and also
after stranding.
4.2.2 The finished material shall have minimum brittleness as it will be subjected to
appreciable vibration while in use.
4.2.3 The steel strands shall be hot dip qalvanised and shall have minimum Zinc coating
after stranding, as stipulated in guaranteed technical particulars attached with. The
zinc coating shall be smooth, continuous, of uniform thickness, free from
imperfections. The steel wire rod shall be of such quality and purity that, when drawn
to the size of the strands specified and coated with zinc, the finished strands shall be
of uniform quality and have the same properties and characteristics as prescribed in
ASTM designation B498-74.
4.2.4 The steel strands shall be preformed and post formed in order to prevent spreading
of strands while cutting of composite earth wire. Care shall be taken to avoid damage
to galvanisation during preforming and postforming operation.
4.2.5 To avoid susceptibility towards wet storage stains (white rust), the finished material
shall be provided with a protective coating of boiled linseed oil.

Technical Specification, Section : SE Page - 15 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

4.3 Joints in Wires

There shall be no joints of any kind in the finished steel wire strand entering into the
manufacture of the earth wire. There shall be no strand joints or strand splices in any
length of the completed stranded earth wire.
4.4 Tolerances
The manufacturing tolerance to the extent of the limits as stipulated in guaranteed
Technical Particulars attached with this specification shall only be permitted in the
diameter of the individual steel strands and lay length of the earth wire.
4.5 Materials
4.5.1 Steel
The steel wire strands shall be drawn from high carbon steel rods and the chemical
composition shall conform to the requirements as stipulated in Guaranteed Technical
Particulars attached with.
4.5.2 Zinc
The zinc used for galvanising shall be electrolytic High Grade Zinc. It shall conform
to and satisfy all the requirements of IS: 209 -1979.
4.6 Standard Length
4.6.1 The standard length of the earth wire shall be as stipulated in Guaranteed Technical
Particulars attached with, with the specified tolerance on standard length.
4.8 TESTS

4.8.1 The following type, routine & acceptance tests and tests during manufacturing shall
be carried out on the earthwire.

4.8.2 TYPE TESTS

In accordance with the stipulation of specification, the following type tests reports
of the earthwire shall be submitted for approval as per clause 9.2 of Section -
GTR.

a) UTS test )
) As per Annexure - B
b) DC resistance test )

4.8.3 ACCEPTANCE TESTS

a) Visual check for joints, )

scratches etc. and )
length of Earthwire )
)
b) Dimensional check ) As per Annexure - B
)
c) Galvanising test )
)
d) Lay length check )
)

Technical Specification, Section : SE Page - 16 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

e) Torsion test )

f) Elongation test )
)
g) Wrap test )

h) DC resistance test )
) IS:398 (Part-III) - 1976
i) Breaking load test )
)
j) Chemical Analysis of )
steel

4.8.4 ROUTINE TESTS

a) Check that there are no cuts, fins etc. on the strands.

b) Check for correctness of stranding.

4.8.5 TESTS DURING MANUFACTURE

a) Chemical analysis of ) As per Annexure - B

zinc used for galvanising )
)
b) Chemical analysis of steel )

5.0 ALUMINIUM TUBE

5.1 General

Aluminium used shall be grade 63401 WP (range 2) conforming to IS:5082.

The contractor shall supply the aluminium tubes as per the standard guaranteed
technical particulars enclosed in Annexure-E of this section and separate
approval for guaranteed technical particulars is not required during detailed
engineering.

5.2 Constructional Features

5.2.1 For outer diameter (OD) & thickness of the tube there shall not be any negative
tolerance, other requirements being as per IS: 2678 and IS: 2673.

5.2.2 The welding of aluminium tube shall be done by the qualified welders duly
approved by the Employer.

5.3 Tests

In accordance with stipulations of the specification, Routine tests shall be

conducted on tubular bus conductors as per IS:5082. Also the wall thickness and
ovality of the tube shall be measured.

5.4 Technical Parameters

Sl. Description 3” AL. 4” AL. 4.5” AL. 5” AL.

No. TUBE TUBE TUBE TUBE
1. Type 3" IPS 4" IPS 4.5" IPS 5" IPS

Technical Specification, Section : SE Page - 17 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

(EH Type) (EH Type) (EH Type) (H Type)

2. Outer diameter 88.9 mm 114.2 mm 120.00 mm 141.30 mm
3. Thickness 7.62 mm 8.51 mm 12.00 mm 9.53 mm
4. Cross-sectional 1945.76 2825.61 4071.50 3945.11
area of sq.mm sq.mm sq.mm sq.mm
aluminium
5. Weight 5.25 kg/m 7.7 kg/m 11.034 kg/m 10.652 kg/m

Sl. Description 6” AL. TUBE 8” AL. TUBE 10” AL. TUBE

No.
1. Type 6‖ IPS 8‖ IPS 10‖ IPS
(H Type) (H Type) (H Type)
2. Outer diameter 150 mm 202 mm 252 mm
3. Thickness 10 mm 16 mm 17 mm
4. Cross-sectional 4398.2 9349.3 12550.6
area of Sq mm sq.mm sq.mm
aluminium
5. Weight 11.875 kg/m 25.243 kg/m 33.887 kg/m

6.0 EARTHING CONDUCTORS

6.1 General

All conductors burried in earth and concrete shall be of mild steel. All conductors
above ground level and earthing leads shall be of galvanised steel, except for
cable trench earthing. The minimum sizes of earthing conductor to be used are
as indicated in clause 9.4 of this Section.

6.2 Constructional Features

6.2.1 Galvanised Steel

a) Steel conductors above ground level shall be galvanised according to

IS:2629.

b) The minimum weight of the zinc coating shall be 610 gm/sq.m for normal
area and 900 gm/sq.m for coastal area as specified in Section-
Project and minimum thickness shall be 85 microns.

c) The galvanised surfaces shall consist of a continuous and uniformly thick

coating of zinc, firmly adhering to the surfaces of steel. The finished
surface shall be clean and smooth and shall be free from defects like
discoloured patches, bare spots, unevenness of coating, spelter which is
loosely attached to the steel globules, spiky deposits, blistered surfaces,
flaking or peeling off etc. The presence of any of these defects noticed
on visual or microscopic inspection shall render the material liable to
rejection.

6.3 Tests

In accordance with stipulations of the specifications galvanised steel shall be

subjected to four one minute dips in copper sulphate solution as per IS : 2633.

Technical Specification, Section : SE Page - 18 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

7.0 SPACERS

7.1 General

Spacers shall conform to IS: 10162. The spacers are to be located at a suitable
spacing to limit the short circuit forces as per IEC -60865. Wherever Employer‘s
765kV, 400 kV, 220kV & 132kV standard gantry structures are being used, the
spacer span(s) for different conductor / span configurations and corresponding
short circuit forces shall be as per Annexure-D. For strung buses, flexible type
spacers shall be used whereas for jumpers and other connections rigid type
spacers shall be used. All quad/twin conductors between equipments/ bus shall
be provided with at least one spacer.

Wherever Employer‘s 765kV, 400 kV, 220kV & 132kV standard gantry structures
are not being used, necessary spacer span calculation shall be provided by the
contractor during detailed engineering for the approval of Employer.

7.2 Constructional Features

7.2.1 No magnetic material shall be used in the fabrication of spacers except for GI
bolts and nuts.

7.2.2 Spacer design shall be made to take care of fixing and removing during
installation and maintenance.

7.2.3 The design of the spacers shall be such that the conductor does not come in
contact with any sharp edge.

7.3 Tests

Each type of spacers shall be subjected to the following type tests, acceptance
tests and routine tests:

7.3.1 Type Tests: Following type test reports shall be submitted for approval as
per clause 9.2 of Section - GTR.

a) Clamp slip tests

The sample shall be installed on test span of twin conductor bundle string
or quadruple conductor bundle string (as applicable) at a tension of 44.2
kN. One of the clamps of the sample when subjected to a longitudinal
pull of 2.5 kN parallel to the axis of the conductor shall not slip on the
conductor. The permanent displacement between the conductor and the
clamp of sample measured after removal of the load shall not exceed 1.0
mm. Similar tests shall be performed on the other clamps of the same
sample.

b) Fault current test as per Cl 5.14.2 of IS: 10162. Alternately, the same can
be carried by simulated short circuit method for which compressive forces
shall be based on IEC-60865.

c) Corona Extinction Voltage Test (Dry).

This test shall be performed on 765 kV, 400 kV and 220 kV spacers as
per procedure mentioned at Annexure - C, Minimum Corona Extinction
voltage shall be as per clause 2.3.2.

Technical Specification, Section : SE Page - 19 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

d) RIV Test (Dry)

This test shall be performed as per procedure mentioned at Annexure - C,

Maximum RIV levels shall be as per clause 2.3.2.

e) Resilience test (if applicable)

f) Tension Test

g) Log decremant test (if applicable)

h) Compression test

i) Galvanising test

7.3.2 Acceptance Test (As per IS:10162)

a) Visual examination

b) Dimensional verification

c) Movement test

d) Clamp slip test

e) Clamp bolt torque test (if applicable)

f) Assembly torque test

g) Compression test

h) Tension test

i) Galvanising test

j) Hardness test for neoprene (if applicable)

The shore hardness of different points on the elastometer surface of

cushion grip clamp shall be measured by shore hardness meter. It shall
be between 65 to 80.

k) Ultimate Tensile Strength Test

The UTS of the retaining rods shall be measured. It shall not be less than
35 kg/Sq. mm.

7.3.3 Routine test

a) Visual examination

b) Dimensional verification

8.0 BUS POST INSULATORS

The post insulators shall conform in general to latest IS: 2544, IEC-60168, IEC
60273 and IEC-60815.

Technical Specification, Section : SE Page - 20 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

8.1 Constructional Features

8.1.1 Bus Post insulators shall consist of a porcelain part permanently secured in a
metal base to be mounted on the supporting structures. They shall be capable of
being mounted upright. They shall be designed to withstand any shocks to which
they may be subjected to by the operation of the associated equipment. Only
solid core insulators will be acceptable.

8.1.2 Porcelain used shall be homogeneous, free from lamination, cavities and other
flaws or imperfections that might affect the mechanical or dielectric quality and
shall be thoroughly vitrified, tough and impervious to moisture.

8.1.3 Glazing of the porcelain shall be of uniform brown in colour, free from blisters,
burrs and other similar defects.

8.1.4 The insulator shall have alternate long and short sheds with aerodynamic profile,
The shed profile shall also meet the requirements of IEC-60815 for the specified
pollution level.

8.1.5 When operating at normal rated voltage there shall be no electric discharge
between conductor and insulators which would cause corrosion or damage to
conductors or insulators by the formation of substance produced by chemical
action.

8.1.6 The design of the insulators shall be such that stresses due to expansion and
contraction in any part of the insulator shall not lead to deterioration.

8.1.7 All ferrous parts shall be hot dip galvanised in accordance with the latest edition
of IS: 2633, & IS: 2629. The zinc used for galvanising shall be grade Zn 99.95 as
per IS: 209. The zinc coating shall be uniform, adherent, smooth, reasonably
bright, continuous and free from imperfections such as flux ash, rust stains, bulky
white deposits and blisters. The metal parts shall not produce any noise
generating corona under the operating conditions.

8.1.8 a) Every bolt shall be provided with a hop dip galvanised steel washer under
the nut so that part of the threaded portion of the bolts is within the
thickness of the parts bolted together.

b) Flat washer shall be circular of a diameter 2.5 times that of bolt and of
suitable thickness. Where bolt heads/nuts bear upon the beveled
surfaces they shall be provided with square tapered washers of suitable
thickness to afford a seating square with the axis of the bolt.

c) All bolts and nuts shall be of steel with well formed hexagonal heads
forged from the solid and shall be hot dip galvanised. The nuts shall be
good fit on the bolts and two clear threads shall show through the nut
when it has been finally tightened up.

8.1.9 Bidder shall furnish drawings for the essential design features of assembly of
shells and metal parts, and number of shells per insulator.

8.2 Tests

In accordance with the stipulations of the specification, the post insulators shall
be subjected to type, acceptance, sample and routine tests as per IEC-60168.

Technical Specification, Section : SE Page - 21 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

8.2.1 In accordance with the stipulation of specification, the following type tests
reports of the post insulators shall be submitted for approval as per clause 9.2 of
Section - GTR.

a) Power frequency withstand test (dry & wet)

b) Lightning impulse test (dry)

c) Switching impulse test (wet) (For 420 kV and above class Insulator only)

d) Measurement of R.I.V (Dry) (As per Annexure – C)

e) Corona extinction voltage test (Dry) (As per Annexure – C)

.
f) Test for deflection under load

g) Test for mechanical strength.

8.2.2 In addition to acceptance/sample/routine tests as per IEC-60168, the following

tests shall also be carried out.

a) Soundness test, metallurgical tests and magnetic particle Inspection

(MPI) test on MCI/SGI caps as acceptance test.

b) All hot dip galvanised components shall be subjected to check for

uniformity of thickness and weight of zinc coating on sample basis as an
acceptance test.

c) The bending test shall be carried out at 50% minimum cantilever strength
load in four directions as a routine test and at 100% minimum cantilever
strength load in four directions as an acceptance test.

d) Acceptance norms for visual defects allowed at site and also at works
shall be agreed in the Quality plan.

8.3 Technical Parameters of Bus Post Insulators.

Sl. Description 800 kV 420 kV 245 kV 145 kV

No.
a) Type Solid Solid Solid Solid
Core Core Core Core
b) Voltage Class (kV) 800 420 245 145
c) Dry and wet one minute 830 680 460 275
power frequency
withstand voltage (kV
rms)
d) Dry lightning impulse ±2100 ±1425 +1050 +650
withstand Voltage (kVp)
e) Wet switching surge ±1550 ±1050 —- —-
withstand voltage (kVp)
f) Max. radio interference 1000 500 500 500
voltage (in microvolts) - at 508 kV at 305 kV at 156 kV at 105 kV
Dry
g) Corona extinction voltage 508 320 156 105
(kV rms) (min.)

Technical Specification, Section : SE Page - 22 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

h) Cantilever Strength
(i) Total minimum cantilever 800 800 800 600
strength (Kg)
i) Minimum torsional As per As per As per As per
moment IEC- IEC- IEC- IEC-
60273 60273 60273 60273
j) Total height of insulator 5700 3650 2300 1500
(mm)
k) P.C.D Top (mm) 225 127 127 127
Bottom (mm) 325 300 254 254
l) No. of bolts
Top 4 4 4 4
Bottom 8 8 8 8
m) Diameter of bolt/holes
(mm)
Top M16 M16 M16 M16
Bottom dia 18 18 18 18
n) Pollution level as per Heavy(III) Heavy(III) Heavy(III) Heavy(III)
IEC-60815
o) Minimum total creepage 20000 10500 6125 3165
distance for Heavy
Pollution (mm)

8.3.1 If corona extinction voltage is to be achieved with the help of corona ring or any
other similar device, the same shall be deemed to be included in the scope of the
Contractor. Aluminium used for corona ring shall be of grade 63401 or 19501
conforming to IS:5082.

9.0 EARTHING

9.1 The earthing shall be done in accordance with requirements given hereunder and
drawing titled ‗Earthing Details‘ enclosed with the specification. The spacing for
the main earthmat shall be provided by the Employer and the earthmat layout
drawings shall be prepared by the contractor based on the spacing provided by
the Employer. The resistivity of the stone for spreading over the ground shall be
considered as 3000 ohm-m under wet condition. The resistivity measurement of
stone (to be used for stone spreading) shall also be done by the Contractor to
confirm the minimum resistivity value of stone considered in earth mat design.
For measurement purpose, one sample of stones from each source (in case
stones are supplied from more than one source) shall be used. The main
earthmat shall be laid in the switchyard area in accordance with the approved
earthmat layout.
9.2 Neutral points of systems of different voltages, metallic enclosures and frame
works associated with all current carrying equipments and extraneous metal
works associated with electric system shall be connected to a single earthing
system unless stipulated otherwise.
9.3 Earthing and lightning protection system installation shall be in strict accordance
with the latest editions of Indian Electricity Rules, relevant Indian Standards and
Codes of practice and Regulations existing in the locality where the system is
installed.

a) Code of practice for Earthing IS: 3043

Technical Specification, Section : SE Page - 23 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

b) Code of practice for the protection of Building and allied structures

against lightning IS: 2309.

c) CEA Safety Regulations 2010 & Indian Electricity Act 2003 with latest
amendments.

d) National Electricity Safety code IEEE-80.

9.4 Details of Earthing System

Sl. Item Size Material

No.
a) Main Earthing Conductor to be 40mm dia Mild Steel rod
buried in ground as per IS:2062/
SAE1018
b) Conductor above ground& 75x12mm G.S. flat Galvanised
earthing leads (for equipment) Steel
c) Conductor above ground& 75x12mm G.S. flat Galvanised
earthing leads(for columns & aux. Steel
structures)
d) Earthing of indoor LT panels, 50x6 mm G.S. flat Galvanised
Control panels and outdoor Steel
marshalling boxes, Junction
boxes& Lighting Panels etc.
e) Rod Earth Electrode 40mm dia, Mild Steel
3000mm long as per IS:2062/
SAE1018
f) Pipe Earth Electrode (in treated 40mm dia, Galvanised
earth pit) as per IS. 3000mm long steel
g) Earthing for motors 25x3mm GS flat Galvanised
steel
h) Earthing conductor along outdoor 50x6mm MS flat Mild steel
cable trenches as per IS:2062/
SAE1018
I) Earthing of Lighting Poles 40 mm dia 3000 Mild steel rod
(for lighting poles outside mm long as per IS:2062/
switchyard) SAE1018
j) Isolator MOM Box 75X12 mm GS flat Galvanised
& Flexible copper steel and
braid copper braid
The sizes of the earthing conductor indicated above are the minimum sizes.
9.5 Earthing Conductor Layout
9.5.1 Earthing conductors in outdoor areas shall be buried at least 600 mm below
finished ground level unless stated otherwise.

9.5.2 Wherever earthing conductor crosses cable trenches, underground service

ducts, pipes, tunnels, railway tracks etc., it shall be laid minimum 300 mm below
them and shall be circumvented in case it fouls with equipment/structure
foundations.

9.5.3 Tap-connections from the earthing grid to the equipment/structure to be earthed

shall be terminated on the earthing terminals of the equipment/structure as per
―Standard Earthing Details – Drg No. C/ENG/STD/EARTHINGS/09‖ enclosed.

Technical Specification, Section : SE Page - 24 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

9.5.4 Earthing conductors or leads along their run on cable trench, ladder, walls etc.
shall be supported by suitable welding/cleating at intervals of 750 mm. Wherever
it passes through walls, floors etc., PVC sleeves shall be provided for the
passage of the conductor and both ends of the sleeve shall be sealed to prevent
the passage of water through the sleeves.

9.5.5 Earthing conductor around the building shall be buried in earth at a minimum
distance of 1500 mm from the outer boundary of the building.

9.5.6 Earthing conductors crossing the road shall be laid 300mm below road or at
greater depth to suit the site conditions.

9.5.7 Earthing conductors embeded in the concrete shall have approximately 50mm
concrete cover.

9.6 ELECTRO-MAGNETIC FIELD CONTROL

The contractor shall provide galvanised steel earth wire at 8m level in the
area where three interconnection levels (equipment interconnection, bus &
jack bus interconnection) are present at 765kV switchyard to limit electric
and magnetic field within permissible limit.

9.7 Equipment and Structure Earthing

9.7.1 Earthing pads shall be provided for the apparatus/equipment at accessible

position. The connection between earthing pads and the earthing grid shall be
made by two short earthing leads (one direct and another through the support
structure) free from kinks and splices. In case earthing pads are not provided on
the item to be earthed, same shall be provided in consultation with Employer.

9.7.2 Whether specifically shown in drawings or not, steel/RCC columns, metallic stairs
etc. shall be connected to the nearby earthing grid conductor by two earthing
leads. Electrical continuity shall be ensured by bonding different sections of
hand-rails and metallic stairs.

9.7.3 Metallic pipes, conduits and cable tray sections for cable installation shall be
bonded to ensure electrical continuity and connected to earthing conductors at
regular interval. Apart from intermediate connections, beginning points shall also
be connected to earthing system.

9.7.4 Metallic conduits shall not be used as earth continuity conductor.

9.7.5 Wherever earthing conductor crosses or runs along metallic structures such as
gas, water, steam conduits, etc. and steel reinforcement in concrete it shall be
bonded to the same.

9.7.6 Light poles, junction boxes on the poles, cable and cable boxes/glands, lockout
switches etc. shall be connected to the earthing conductor running alongwith the
supply cable which in turn shall be connected to earthing grid conductor at a
minimum two points whether specifically shown or not.

9.7.7 Railway tracks within switchyard area shall be earthed at a spacing of 30m and
also at both ends.

9.7.8 Earthing conductor shall be buried 2000 mm outside the switchyard fence. All the
gates and every alternate post of the fence shall be connected to earthing grid.

Technical Specification, Section : SE Page - 25 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

The stone spreading shall also be done 2000 mm outside switchyard fence. The
criterian for stone spreading shall be followed in line with requirement specified
elsewhere in the specification

9.7.9 Flexible earthing connectors shall be provided for the moving parts.

9.7.10 All lighting panels, junction boxes, receptacles fixtures, conduits etc. shall be
grounded in compliance with the provision of I.E. rules

9.7.11 A continuous ground conductor of 16 SWG GI wire shall be run all along each
conduit run. The conductor shall be connected to each panel ground bus. All
junction boxes, receptacles, switches, lighting fixtures etc. shall be connected to
this 16 SWG ground conductor.

9.7.12 50mm x 6mm MS flat shall run on the top tier and all along the cable trenches
and the same shall be welded to each of the racks. Further this flat shall be
earthed at both ends and at an interval of 30 mtrs. The M.S. flat shall be finally
painted with two coats of Red oxide primer and two coats of Zinc riched enamel
paint.

9.7.13 One number 40 mm dia, 3000 mm long MS earth electrode with test link, CI
frame and cover shall be provided to connect each down conductor of surge
arresters, capacitive voltage transformers, lightning masts and towers with peak.

9.8 Jointing

9.8.1 Earthing connections with equipment earthing pads shall be bolted type. Contact
surfaces shall be free from scale, paint, enamel, grease, rust or dirt. Two bolts
shall be provided for making each connection. Equipment bolted connections,
after being checked and tested, shall be painted with anti corrosive
paint/compound.

9.8.2 Connection between equipment earthing lead and main earthing conductors and
between main earthing conductors shall be welded type. For rust protections, the
welds should be treated with red oxide primer and afterwards coated with two
layers bitumen compound to prevent corrosion.

9.8.3 Steel to copper connections shall be brazed type and shall be treated to prevent
moisture ingression.

9.8.4 Resistance of the joint shall not be more than the resistance of the equivalent
length of the conductor.

9.8.5 All ground connections shall be made by electric arc welding. All welded joints
shall be allowed to cool down gradually to atmospheric temperature before put-
ting any load on it. Artificial cooling shall not be allowed.

9.8.6 All arc welding with large dia. conductors shall be done with low hydrogen
content electrodes.

9.8.7 The 75x12mm GS flat shall be clamped with the equipment support structures at
1000mm interval.

Technical Specification, Section : SE Page - 26 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

9.9 Power Cable Earthing

Metallic sheaths and armour of all multi core power cables shall be earthed at
both equipment and switchgear end. Sheath and armour of single core power
cables shall be earthed at switchgear end only.

9.10 Specific Requirement for Earthing Systems

9.10.1 Each earthing lead from the neutral of the power transformer/Reactor shall be
directly connected to two numbers pipe electrodes in treated earth pit (as per IS)
which in turn, shall be buried in Cement Concrete pit with a ISI marked cast iron
cover hinged to a cast iron frame to have an access to the joints. All accessories
associated with transformer/reactor like cooling banks, radiators etc. shall be
connected to the earthing grid at minimum two points.

9.10.2 Earthing terminal of each lightning arrester & capacitor voltage transformer shall
be directly connected to rod earth electrode which in turn, shall be connected to
station earthing grid.

9.10.3 Auxiliary earthing mat comprising of 40mm dia M.S. rods closely spaced (300
mm x 300 mm) conductors shall be provided at depth of 300mm from ground
level below the operating handles of the M.O.M. Box of the isolators. M.O.M.
boxes shall be directly connected to the auxiliary earthing mat. Flexible copper
braid connection to be provided between MOM box and GI flat to take care of soil
sagging. The size of auxiliary earthing mat shall be of 1500mmx1500mm size for
220kV and above voltage class isolators and 900mmx900mm size for 132kV and
below voltage class isolators. Factory welded auxiliary earthmat is preferable.

9.11 Insulating mats

9.11.1 The scope covers supply and laying of insulating mats of ―class A‖ conforming to
IS: 15652-2006.

9.11.2 These insulating mats shall be laid in front of all floor mounted AC and DC
switchboards and control & relay panels located in control room building/
Switchyard panel room.

9.11.3 The insulating mats shall be made of elastomer material free from any insertions
leading to deterioration of insulating properties. It shall be resistant to acid, oil
and low temperature.

9.11.4 Upper surface of the insulating mats shall have small aberration (rough surface
without edges) to avoid slippery effects while the lower surface shall be plain or
could be finished slip resistant without affecting adversely the dielectric property
of the mat.

9.11.5 Insulating mat (wherever applicable) shall be of pastable type, to be fixed

permanently on the front of the panels except for the chequered plate area which
shall not be pasted as per requirement. The insulating mats shall generally be
fixed and joints shall be welded as per recommendations in Annexure-A of IS:
15652.

9.11.6 Width of insulating mats shall generally be of 1.5 meters or as per site
requirements. Length shall be supplied as per site requirements.

9.11.7 The insulating mats offered shall conform to IS: 15652-2006.

Technical Specification, Section : SE Page - 27 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

10.0 Bus Bars

The brief description of the bus switching scheme, bus bar layout and equipment
connection to be adopted are indicated elsewhere in the specification. The bus
bar arrangements are shown in electrical layout drawings enclosed with the bid
documents.

10.1 The Contractor shall furnish supporting calculations where the design is to be
done by the contractor for the bus bars/conductors to show adequacy of design
parameters for:

a) Fibre-stress (applicable for aluminum tube)

b) Cantilever strength of post insulators (applicable for aluminum tube)

c) Aeolain vibrations (applicable for aluminum tube)

d) Vertical deflection of bus bars (applicable for aluminum tube)

e) Short circuit forces in bundle conductor and spacer location for each span
of ACSR conductor stringing as per layout drawings.
10.1.1 The welds in the aluminium tubes shall be kept to the minimum and there shall
not be more than one weld per span. The procedure and details of welding shall
be subject to Employer‘s approval. Material for welding sleeve shall be same as
that of Aluminium tube. Welding sleeve shall be of 600mm length
10.1.2 Corona bells shall be provided wherever the bus extends beyond the clamps and
on free ends, for sealing the ends of the tubular conductor against rain and
moisture and to reduce the electrostatic discharge loss at the end points. There
shall be a small drain hole in the corona bell. The material of Corona bell shall be
Aluminium alloy similar to that of clamps & connectors.
10.1.3 To minimise the vibrations in the aluminium tubes, damping conductor shall be
provided inside the aluminium tubes. For this purpose, the cut pieces of ACSR
conductor which otherwise are considered wastages, shall be used as damping
conductor.
10.1.4 Details of past experience of the persons proposed to be employed for
Aluminium tube welding and the test reports of the welded pieces to prove the
electrical and mechanical characteristics shall also be furnished to Employer.
Welding at site shall be done by adopting a qualified procedure and employing
qualified welders as per ASME-Section IX.

10.1.5 Joints shall be avoided in strung bus to avoid joint failure / hot spots and
hardwares to be designed accordingly.

11.0 BAY EQUIPMENT

11.1 The disposition of various bay equipments shall be as per single line diagrams
and layout drawings.
11.2 Bay Marshalling Kiosk:-
Bay marshalling kiosk shall be fabricated from 304 grade stainless steel of
minimum thickness of 1.6mm. For other constructional details, technical
specification of section-GTR shall be referred. Further, for stainless steel
type bay marshaling kiosk, no painting is envisaged.

Technical Specification, Section : SE Page - 28 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

One no. of bay marshalling kiosk shall be provided for each 765 kV, 400 kV, 220
kV and 132 kV bay under present scope. For one and half breaker scheme, one
number bay marshalling kiosk shall be provided for each controlling feeder (Line/
transformer/ bus reactor etc) of the diameter and no bay marshalling kiosks are
required to be provided for the tie bays. In addition to the requirements specified
elsewhere in the specification, the bay marshalling kiosk shall have two distinct
compartments for the following purpose:-

A. For 765kV , 400 kV & 220 kV Bays

(i) To receive two incoming 415V, 3 phase, 63Amps, AC supply with auto
changeover and MCB unit and distribute minimum nine (9) numbers
outgoing 415V, 3 phase, 16 Amps AC supplies controlled by MCB.

(ii) To distribute minimum two numbers outgoing 415V, 63Amps three phase
supplies to be controlled by MCB to be drawn from above 3 phase
incomers for supply to switchyard panel rooms.

(iii) To distribute minimum ten numbers outgoing 240V, 10 Amps single

phase supplies to be controlled by MCB to be drawn from above 3 phase
incomers.

(iv) Necessary Terminal Blocks for terminating cables from ACDB and
necessary heating circuits.

B. For 132kV & 66 kV Bays

(i) To receive two incoming 415V, 3 phase, 63Amps, AC supply with auto
changeover and MCB unit and distribute minimum four (4) number
outgoing 415V, 3 phase, 16 Amps AC supplies controlled by MCB.

(ii) To distribute minimum six (6) numbers outgoing 240V, 10 Amps single
phase supplies to be controlled by MCB to be drawn from above 3 phase
incomers.

(iii) 100 nos. terminal blocks in vertical formation for interlocking facilities for
substations without automation system.

(iv) Necessary Terminal Blocks for terminating cables from ACDB and
necessary heating circuits.

11.3 Further, all Bay Marshalling Kiosks shall be erected such that a minimum height
of 1000mm is maintained between FGL & bottom of the marshalling box. Size of
Marshalling box shall be such that cables are properly terminated and wires are
dressed with provision of loop.

11.4 BAY AND PHASE IDENTIFICATION

11.4.1 The name plate for the bays shall be provided by the contractor as per standard
drawing (Drawing no. C/ENG/STD/BAY NAME PLATE) enclosed in this technical
specification.

11.4.2 All the phases are to be identified by painting the structures Red, Yellow and
Blue by reflecting colour as per as built condition. Phase identification colour is to
be provided around the top of the structure with colour band of 100 mm width at
a height of approximately 2000mm from the finished ground level.

Technical Specification, Section : SE Page - 29 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

12.0 LIGHTNING PROTECTION

12.1 Direct stroke lightning protection (DSLP) shall be provided in the EHV switchyard
by lightning masts and shield wires. The layout drawings enclosed indicate the
tentative arrangement. The final arrangement shall be decided after approval of
the DSLP calculations.
12.2 The lightning protection system shall not be in direct contact with underground
metallic service ducts and cables.
12.3 Conductors of the lightning protection system shall not be connected with the
conductors of the safety earthing system above ground level.
12.4 Down conductors shall be cleated on the structures at 2000 mm interval.
12.5 Connection between each down conductor and rod electrodes shall be made via
test joint (pad type compression clamp) located approximately 1500 mm above
ground level. The rod electrode shall be further joined with the main earthmat.

12.6 Lightning conductors shall not pass through or run inside G.I. conduits.

12.7 Lightning protection shall also be provided for various buildings like control
building, FFPH, Township buildings as per relevant standard.

13.0 EQUIPMENT ERECTION DETAILS

13.1 All circuit breaker and isolator erection shall be done under the supervision of
equipment manufacturer and erection of all switchyard equipments shall be done
as per POWERGRID approved Field Quality Plan (FQP) and as per provision of
Technical Specification.

13.2 For equipment interconnection, the surfaces of equipment terminal pads,

Aluminium tube, conductor & terminal clamps and connectors shall be properly
cleaned. After cleaning, contact grease shall be applied on the contact surfaces
of equipment terminal pad, Aluminium tube/conductor and terminal clamps to
avoid any air gap in between. Subsequently bolts of the terminal pad/terminal
connectors shall be tightened and the surfaces shall be cleaned properly after
equipment interconnection.

13.3 Muslin or leather cloth shall be used for cleaning the inside and outside of hollow
insulators.

13.4 All support insulators, circuit breaker interrupters and other fragile equipment
shall preferably be handled with cranes having suitable booms and handling
capacity.

13.5 Bending of Aluminium tube and compressed air piping if any should be done by a
bending machine and through cold bending only. Bending shall be such that
inner diameter of pipe is not reduced.

All welding done at site for equipment and structures, shall be painted with zinc
rich paint immediately to avoid corrosion.

13.6 Cutting of the pipes wherever required shall be such as to avoid flaring of the
ends. Hence only a proper pipe cutting tool shall be used. Hack saw shall not be
used.

13.7 Handling of equipment shall be done strictly as per manufacturer‘s/supplier‘s

Technical Specification, Section : SE Page - 30 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

instructions/instruction manual.

13.8 Handling equipment, sling ropes etc. should be tested periodically before
erection for strength.

13.9 The slings shall be of sufficient length to avoid any damage to insulator due to
excessive swing, scratching by sling ropes etc.

14.0 STORAGE

14.1 The Contractor shall provide and construct adequate storage shed as per the
Filed Quality Plan for proper storage of equipments, where sensitive equipments
shall be stored indoors. All equipments during storage shall be protected against
damage due to acts of nature or accidents. The storage instructions of the
equipment manufacturer/Employer shall be strictly adhered to. POWERGRID
approved Field Quality Plan shall be followed alongwith the provision of
Technical Specification for storage.

15.0 CABLING MATERIAL

15.1 CABLE TAGS AND MARKERS

15.1.1 Each cable and conduit run shall be tagged with numbers that appear in the
cable and conduit schedule.

15.1.2 The tag shall be of aluminium with the number punched on it and securely
attached to the cable conduit by not less than two turns of 20 SWG GI wire
conforming to IS:280. Cable tags shall be of rectangular shape for power cables
and of circular shape for control cables.

15.1.3 Location of cables laid directly underground shall be clearly indicated with cable
route marker made of galvanised iron plate.

15.1.4 Location of underground cable joints shall be indicated with cable route marker
with an additional inscription ―Cable joints‖.

15.1.5 The cable route marker shall project 150 mm above ground and shall be spaced
at an interval of 30 meters and at every change in direction. They shall be
located on both sides of road and drain crossings as per relevant standard.

15.1.6 Cable tags shall be provided on all cables at each end (just before entering the
equipment enclosure), on both sides of a wall or floor crossing, on each
duct/conduit entry and at each end & turning point in cable tray/trench runs.
Cable tags shall be provided inside the switchgear, motor control centres, control
and relay panels etc., wherever required for cable identification, where a number
of cables enter together through a gland plate.

15.2 Cable Supports and Cable Tray Mounting Arrangements

15.2.1 The Contractor shall provide embedded steel inserts on concrete floors/walls to
secure supports by welding to these inserts or available building steel structures.

15.2.2 The supports shall be fabricated from standard structural steel members.

15.2.3 Insert plates will be provided at an interval of 750 mm wherever cables are to be
supported without the use of cable trays, such as in trenches, while at all other

Technical Specification, Section : SE Page - 31 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

places these will be at an interval of 2000 mm.

15.2.4 Vertical run of cables on equipment support structure shall be supported on

perforated cable trays of suitable width which shall be suitably bolted/clamped
with the equipment support structure.
.
15.3 Cable Termination and Connections

15.3.1 The termination and connection of cables shall be done strictly in accordance
with cable and termination kit manufacturer‘s instructions, drawing and/or as
directed by the Employer.

15.3.2 The work shall include all clamping, fittings, fixing, plumbing, soldering, drilling,
cutting, taping, heat shrinking (where applicable), connecting to cable terminal,
shorting and grounding as required to complete the job.

15.3.3 Supply of all consumable material shall be in the scope of Contractor.

15.3.4 The equipment will be generally provided with undrilled gland plates for
cables/conduit entry. The Contractor shall be responsible for drilling of gland
plates, painting and touching up. Holes shall not be made by gas cutting.

15.3.5 Control cable inside control panel/switchgear/MCCB/MCC/ miscellaneous panels

shall be neatly bunched, clamped and tied with nylon strap or PVC perforated
strap to keep them in position.

15.3.6 The Contractor shall use printed ferrules for control cable cores at all
terminations, as instructed by the Employer. Each cable wire shall be identified
with a number and detailed cable schedule may be prepared indicating the wire
numbers.

15.3.7 Spare cores shall be similarly encaped & tagged with cable numbers and coiled
up with end cap.

15.3.8 All cable entry points shall be sealed and made vermin and dust proof. Unused
openings shall be effectively closed.

15.3.9 Double compression type nickel plated (coating thickness not less than 10
microns) brass cable glands shall be provided by the Contractor for all power and
control cables to provide dust and weather proof terminations.

15.3.10 The cable glands shall conform to BIS:6121. They shall comprise of heavy duty
brass casting, machine finished and nickel plated, to avoid corrosion and oxida-
tion. Rubber components used in cable glands shall be neoprene and of tested
quality. Cable glands shall be of approved make.

15.3.11 The cable glands shall also be suitable for dust proof and weather proof
termination.

15.3.12 If the cable-end box or terminal enclosure provided on the equipment is found
unsuitable and requires modification, the same shall be carried out by the
Contractor, as directed by the Employer.

15.3.13 Crimping tool used shall be of approved design and make.

15.3.14 Control Cable lugs shall be tinned copper solderless crimping type conforming to

Technical Specification, Section : SE Page - 32 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

IS-8309 & 8394. Aluminium Bimetallic lugs for power cables as required shall be
used depending upon type of cables and terminations.

15.3.15 Solderless crimping of terminals shall be done by using corrosion inhibitory

compound. The cable lugs shall suit the type of terminals provided.

15. 4 Storage and handling of Cable Drums

15.4.1 Cable drums shall be unloaded, handled and stored in an approved manner and
rolling of drums shall be avoided as far as possible. For short distances, the
drums may be rolled provided they are rolled slowly and in proper direction as
marked on the drum.

16.0 DIRECTLY BURIED CABLES

16.1 The Contractor shall construct the cable trenches required for directly buried
cables. The scope of work shall include excavation, preparation of sand bedding,
soil cover, supply and installation of brick or concrete protective covers, back
filling and ramming, supply and installation of route markers and joint markers.

16.2 The cable (power and control) between LT station, DG set location and fire
lighting pump house and control room shall be laid in the burried cable trenches.
In addition to the above, for lighting purpose also, buried cable trench can be
used in outdoor area.

16.3 Power cables from Main Switchboard to colony shall be laid in burried cable
trench. Location of cable termination point at colony shall be as per site condition
and shall be decided in consultation with Employer‘s site-in-charge. Power
Cables for oil filtration plant shall be laid in open cable trench or burried trench
upto transformer/reactor area and can be looped from adjacent receptacles
provided for power supply of oil filtration plant.

16.4 Cable route and joint markers and RCC warning covers shall be provided
wherever required. The voltage grade of cables shall be engraved on the marker.
Cable markers shall be grounded in a concrete base.

17.0 INSTALLATION OF CABLES

17.1 Cabling in the control room shall be done on ladder type cable trays for vertical
runs while cabling in switchyard area shall be done on angles in the trench.

17.2 All cables from bay cable trench to equipments including and all interpole cables
(both power and control) for all equipment, shall be laid in PVC pipes of minimum
50 mm nominal outside diameter of class 4 as per IS 4985 which shall be buried
in the ground at a depth of 250mm below finish formation level. Separate PVC
pipes shall be laid for control and power cables. Cable pull boxes of adequate
size shall be provided if required. For vertical runs on equipments, perforated
cable trays shall be provided for all equipments under scope of the
contract or any equipment to be provided by the owner (including for
owner supplied circuit breakers).

17.3 Cables shall be generally located adjoining the electrical equipment through the
pipe insert embedded in the floor. In the case of equipments located away from
cable trench either pipe inserts shall be embedded in the floor connecting the
cable trench and the equipment or in case the distance is small, notch/opening
on the wall shall be provided. In all these cases necessary bending radius as

Technical Specification, Section : SE Page - 33 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

recommended by the cable manufacturer shall be maintained. Embedded pipes

shall be dressed properly at the equipment termination points.

17.4 Cable racks and supports shall be painted after installation with two coats of
metal primer (comprising of red oxide and zinc chromate in a synthetic medium)
followed by two finishing coats of aluminium paint. The red oxide and zinc
chromate shall conform to IS:2074.

17.5 Suitable arrangement should be used between fixed pipe/cable trays and
equipment terminal boxes, where vibration is anticipated.

17.6 Power and control cables in the cable trench shall be laid in separate tiers. The
order of laying of various cables shall be as follows, for cables other than directly
buried.
a) Power cables preferably on top tiers.
b) Control instrumentation and other service cables in bottom tiers.
c) For cabling from control room to switchyard in main cable trench, cable
shall be laid such that bottom tiers are preferably filled first and top tiers
are kept for filling future cables as per the instructions of Engineer-In-
Charge.
17.7 For Single core cables in trefoil formation shall be laid with a distance of three
times the diameter of cable between trefoil centre lines. Further, for horizontal
cables a minimum centre to centre distance equal to twice the diameter of the
cable of higher size of cables shall be maintained.

17.8 Trefoil clamps for single core cables shall be of pressure die cast aluminium (LM-
6), Nylon-6 or fibre glass and shall include necessary fixing GI nuts, bolts,
washer etc. These are required at every 2 metre of cable runs.

17.9 Power and control cables shall be securely fixed to the trays/supports with self
locking type nylon ties with de-interlocking facility at every 5 metre interval for
horizontal run. Vertical and inclined cable runs shall be secured with 25 mm
wide and 2 mm thick aluminium strip clamps at every 2m.

17.10 Cables shall not be bent below the minimum permissible limit. The permissible
limits are as follows:

Table of Cable and Minimum bending radius

Power cable 12 D
Control cable 10 D
D is overall diameter of cable
17.11 Where cables cross roads, drains and rail tracks, these shall be laid in reinforced
spun concrete or steel pipes buried at not less than one metre depth. The size of
hume/steel pipe shall be such that approximately 70% area is only occupied. For
meeting future requirement, additional hume/steel pipe shall be laid for future bay
provision.

17.12 In each cable run some extra length shall be kept at a suitable point to enable
one (for LT cables)/ two (for H.T. cables) straight through joints to be made in
case the cable develop fault at a later date.

17.13 Selection of cable drums for each run shall be so planned as to avoid using
straight through joints. Cable splices will not be permitted except where called for

Technical Specification, Section : SE Page - 34 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

by the drawings, unavoidable or where permitted by the Employer. If straight

through joints are unavoidable, the Contractor shall use the straight through
joints kit of reputed make.

17.14 Control cable terminations inside equipment enclosures shall have sufficient
lengths so that changing of termination in terminal blocks can be done without
requiring any splicing.

17.15 Metal screen and armour of the cable shall be bonded to the earthing system of
the station, wherever required by the Employer.

17.16 Rollers shall be used at intervals of about two metres while pulling cables to
avoid damage.

17.17 All due care shall be taken during unreeling, laying and termination of cable to
avoid damage due to twist, kinks, sharp bends, etc.

17.18 Cable ends shall be kept sealed to prevent damage. In cable vault, fire resistant
seal shall be provided underneath the panels.

17.19 Inspection on receipt, unloading and handling of cables shall generally be in

accordance with IS:1255 and other Indian Standard Codes of practices.

17.20 Wherever cable pass through floor or through wall openings or other partitions,
GI/PVC wall sleeves with bushes having a smooth curved internal surface so as
not to damage the cable, shall be supplied, installed and properly sealed by the
Contractor at no extra charges.

17.21 In case the outer sheath of a cable is damaged during handling/installation, the
Contractor shall repair it at his own cost to the satisfaction of the Employer. In
case any other part of a cable is damaged, the same shall be replaced by a
healthy cable at no extra cost to the Employer, i.e. the Contractor shall not be
paid for installation and removal of the damaged cable.

17.22 All cable terminations shall be appropriately tightened to ensure secure and
reliable connections. The Contractor shall cover the exposed part of all cable
lugs whether supplied by him or not with insulating tape, sleeve or paint.

17.23 Cable trays

i) The cable trays shall be of G.S Sheet and minimum thickness of sheet
shall be 2mm.

ii) The Contractor shall perform all tests and inspection to ensure that
material and workmanship are according to the relevant standards.
Contractor shall have to demonstrate all tests as per specification and
equipment shall comply with all requirements of the specification.

a) Test for galvanising (Acceptance Test)

The test shall be done as per approved standards.

17.24 Conduits, Pipes and Duct Installation

17.24.1 Contractor shall supply and install all rigid conduits, mild steel pipes, flexible
conduits, hume pipes etc. including all necessary sundry materials such as tees,
elbows, check nuts, bushing, reducers, enlargers, coupling cap, nipples, gland

Technical Specification, Section : SE Page - 35 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

sealing fittings, pull boxes etc as required. The size of the conduit/pipe shall be
selected on the basis of 40% fill criterion.

17.24.2 Contractor shall have his own facility for bending, cutting and threading the
conduits at site. Cold bending should be used. All cuts & threaded ends shall be
made smooth without leaving any sharp edges. Anticorrosive paint shall be
applied at all field threaded portions.

17.24.3 All conduit/pipes shall be extended on both sides of wall/floor openings. The
fabrication and installation of supports and the clamping shall be included in the
scope of work by Contractor.

17.24.4 Installation of optical cables/ special cables:

GI pipe (light grade) of suitable size (minimum 25 mm) along with required
bends, joints etc. shall be used for special cables such as cables for visual
monitoring system (VMS), substation automation system (SAS). Further,
single pipe can be used for laying multiple cables.

17.24.5 All conduits/pipes shall have their ends closed by caps until cables are pulled.
After cables are pulled, the ends of conduits/pipes shall be sealed in an approved
manner to prevent damage to threaded portions and entrance of moisture and
foreign material.

17.24.6 All unarmoured cables shall run within the conduits from lighting panels to
lighting fixtures, receptacles etc.

17.24.7 Size of conduit for lighting shall be selected by the Contractor during detailed
engineering.

17.24.8 Exposed conduits shall be run in straight lines parallel to building columns,
beams and walls. Unnecessary bends and crossings shall be avoided to present
a neat appearance.

17.24.9 Conduit supports shall be provided at an interval of 750mm for horizontal runs
and 1000mm for vertical runs.

17.24.10 Conduit supports shall be clamped on the approved type spacer plates or
brackets by saddles or U- bolts. The spacer plates or brackets in turn, shall be
securely fixed to the building steel by welding and to concrete or brick work by
grouting or by nylon rawl plugs. Wooden plug inserted in the masonary or
concrete for conduit support is not acceptable.

17.24.11 Embedded conduits shall be securely fixed in position to preclude any

movement. In fixing embedded conduit, if welding or brazing is used, extreme
care should be taken to avoid any injury to the inner surface of the conduit.

17.24.12 Spacing of embedded conduits shall be such as to permit flow of concrete

between them.

17.24.13 Where conduits are placed alongwith cable trays, they shall be clamped to
supporting steel at an interval of 600mm.

17.24.14 For directly embedding in soil, the conduits shall be coated with an asphalt-base
compound. Concrete pier or anchor shall be provided wherever necessary to
support the conduit rigidly and to hold it in place.

Technical Specification, Section : SE Page - 36 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

17.24.15 Conduit shall be installed in such a way as to ensure against trouble from
trapped condensation.

17.24.16 Conduits shall be kept, wherever possible, at least 300mm away from hot pipes,
heating devices etc. when it is evident that such proximity may reduce the
service life of cables.

17.24.17 Slip joints shall be provided when conduits cross structural expansion joints or
where long run of exposed conduits are installed, so that temperature change will
cause no distortion due to expansion or contraction of conduit run.

17.24.18 For long conduit run, pull boxes shall be provided at suitable intervals to facilitate
wiring.

17.24.19 Conduit shall be securely fastened to junction boxes or cabinets, each with a lock
nut inside and outside the box.

17.24.20 Conduits joints and connections shall be made thoroughly water-tight and rust
proof by application of a thread compound which insulates the joints. White lead
is suitable for application on embedded conduit and red lead for exposed conduit.

17.24.21 Field bends shall have a minimum radius of four (4) times the conduit diameter.
All bends shall be free of kinks, indentations of flattened surfaces. Heat shall not
be applied in making any conduit bend. Separate bends may be used for this
purpose.

17.24.22 The entire metallic conduit system, whether embedded or exposed, shall be
electrically continuous and thoroughly grounded. Where slip joints are used,
suitable bounding shall be provided around the joint to ensure a continuous
ground circuit.

17.24.23 After installation, the conduits shall be thoroughly cleaned by compressed air
before pulling in the wire.

17.24.24 Lighting fixtures shall not be suspended directly from the junction box in the main
conduit run.

17.25 Cable Sealing System

Modular multi-diameter cable sealing system consisting of frames, blocks and

accessories shall be installed where the underground and over ground cables
enter or leave concrete bay kiosks/switchyard panel room & control rooms in the
substations. Cable sealing system shall consist of multi-diameter type peel-able
or adjustable blocks of different sizes to suit the various cables. It should be
simple, easy and quick to assemble & re-assemble the cable sealing system.
Solid blocks shall not be used on frame. Frames & stay-plate material shall be of
galvanized steel and for compression, single piece wedge with galvanized steel
bolts shall be used. 30% spare blocks on the frame shall be provided for
expansion in future. Cable sealing system should have been tested for
fire/water/smoke tightness.

Cable sealing system having earthing strip can alternately be used in place
of cable gland arrangement for indoor panels such as LCC, C&R, PLCC
panels etc.

Technical Specification, Section : SE Page - 37 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

18.0 LIGHTING JUNCTION BOX

The Contractor shall supply and install ISI marked junction boxes complete with
terminals as required. The brackets, bolts, nuts, screws etc required for erection
are also included in the scope of the Contractor.

19.0 TESTING AND COMMISSIONING

19.1 All pre/commissioning activities and works work for substation equipment
shall be carried out in accordance with Employer's ''Pre- Commissioning
procedures for Switchyard Equipments (Doc. No. D-2-01-03-01-03)" by the
contractor. This document shall be provided to the successful contractor
during detailed engineering stage. Test results in the prescribed formats
shall be duly filled by the contractor and shall be submitted to the Owner in
soft form (CD or Pen Drive)

The Contractor shall arrange all equipments instruments and auxiliaries required
for testing and commissioning of equipments alongwith calibration certificates.

19.2 GENERAL CHECKS

(a) Check for physical damage.

(b) Visual examination of zinc coating/plating.

(c) Check from name plate that all items are as per order/specification.

(d) Check tightness of all bolts, clamps and connecting terminals using
torque wrenches.

(e) For oil filled equipment, check for oil leakage, if any. Also check oil level
and top up wherever necessary.

(f) Check ground connections for quality of weld and application of zinc rich
paint over weld joint of galvanised surfaces.

(g) Check cleanliness of insulator and bushings.

(h) All checks and tests specified by the manufacturers in their drawings and
manuals as well as all tests specified in the relevant code of erection.

(i) Check for surface finish of grading rings (Corona control ring).

19.3 STATION EARTHING

a) Check soil resistivity

b) Check continuity of grid wires

c) Check earth resistance of the entire grid as well as various sections of the
same.

d) Check for weld joint and application of zinc rich paint on galvanised
surfaces.

e) Dip test on earth conductor prior to use.

Technical Specification, Section : SE Page - 38 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

19.4 AAC/ACSR STRINGING WORK, TUBULAR BUS WORK AND POWER

CONNECTORS

a) Physical check for finish

b) Electrical clearance check

c) Testing of torque by torque wrenches on all bus bar power connectors

and other accessories.

d) Millivolt drop test on all power connectors.

e) Sag and tension check on conductors.

19.5 ALUMINIUM TUBE WELDING

a) Physical check

b) Millivolt drop test on all joints.

c) Dye penetration test & Radiography test on 10% sample basis on weld
joints.

c) Test check on 5% sample joints after cutting the weld piece to

observe any voids etc.

19.6 INSULATOR

Visual examination for finish, damage, creepage distance etc.

Technical Specification, Section : SE Page - 39 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

ANNEXURE “A”

(Testing Procedure for ACSR/AAC Conductor)

1.0 UTS Test on Stranded Conductor

Circles perpendicular to the axis of the conductor shall be marked at two places
on a sample of conductor of minimum 5m length suitably compressed with dead
end clamps at either end. The load shall be increased at a steady rate upto 50%
of minimum specified UTS and held for one minute. The circles drawn shall not
be distorted due to Relative movement of strands. Thereafter the load shall be
increased at a steady rate to 100% of minimum specified UTS and held for one
minute. The conductor sample shall not fail during this period. The applied load
shall then be increased until the failing load is reached and the value recorded.

2.0 Corona Extinction Voltage Test

Two samples of conductor of 5m length shall be strung with a spacing of 450 mm

between them at a height not exceeding 8.0 m above ground. This assembly
shall be tested as per Annexure-C, Corona extinction voltage shall not be less
than 510 kV (rms) & 320 KV (RMS) Line to ground for 765 kV & 400 kV
respectively.

3.0 Radio Interference Voltage Test

Under the conditions as specified under (2.0) above, the conductor samples shall
have radio interference voltage as indicated in the guaranteed technical
particulars enclosed with. This test may be carried out with corona control rings
and arcing horns. The test procedure shall be in accordance with IEC-60437.

4.0 D.C Resistance Test on Stranded Conductor

On a conductor sample of minimum 5 m length two contact clamps shall be fixed

with a pre-determined bolt torque. The resistance shall be measured by a Kelvin
double bridge by placing the clamps initially zero metre and subsequently one
metre apart. The test shall be repeated at least five times and the average value
recorded. The value obtained shall be corrected to the value at 20°C as per
clause no. 12.8 of IS:398 (Part V)-1982. The resistance corrected at 20°C shall
conform to the requirements of this specification.

5.0 Chemical Analysis of Zinc

Samples taken from the zinc ingots shall be chemically/spectrographically

analysed. The same shall be in conformity to the requirements stated in this
specification.

6.0 Chemical Analysis of Aluminium and Steel

Samples taken from the Aluminium ingots/coils/strands shall be chemically/

spectrographically analysed. The same shall be in conformity to the require-
ments stated in this specification.

7.0 Visual Check for Joints, Scratches etc.

Conductor drums shall be rewound in the presence of the inspector. The

Technical Specification, Section : SE Page - 40 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

inspector shall visually check for scratches, joints, etc. and that the conductor
generally conform to the requirements of this specification. The length of
conductor wound on the drum shall be measured with the help of counter meter
during rewinding.

8.0 Dimensional Check for Steel and Aluminium Strands.

The individual strands shall be dimensionally checked to ensure that they

conform to the requirements of this specification.

9.0 Check for Lay-ratios of various Layers.

The lay-ratios of various layers shall be checked to ensure that they conform to
the requirements of this Specification.

10.0 Galvanising Test

The test procedure shall be as specified in IEC:60888. The material shall conform
to the requirements of this Specification. The adherence of zinc shall be checked
by wrapping around a mandrel four times the diameter of steel wire.

11.0 Torsion and Elongation Tests on Steel Strands

The test procedures shall be as per clause No. 10.3 of IEC:60888. In torsion test,
the number of complete twists before fracture shall not be less than that indicated
in the GTP. In case test sample length is less or more than 100 times the
stranded diameter of the strand, the minimum number of twists will be
proportioned to the length and if number comes in the fraction then it will be
rounded off to next higher whole number. In elongation test, the elongation of the
strand shall not be less than 4% for a gauge length of 250 mm.

12.0 Procedure Qualification test on welded Aluminium strands

Two Aluminium wires shall be welded as per the approved quality plan and shall
be subjected to tensile load. The breaking strength of the welded joint of the wire
shall not be less than the breaking strength of individual strands.

Technical Specification, Section : SE Page - 41 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

ANNEXURE “B”

(Testing procedure for Galvanised Steel Earthwire)

1. UTS TEST

Circles perpendicular to the axis of the earthwire shall be marked at two places
on a sample of earthwire of minimum 5m length suitably compressed with dead
end clamps at either end. The load shall be increased at steady rate upto 50% of
UTS and held for one minute. The circles drawn shall not be distorted due to
relative movement of strands. Thereafter, the load shall be increased at a steady
rate to 100% of UTS and held for one minute. The earthwire sample shall not fail
during this period. The applied load shall then be increased until the failing load
is reached and value recorded.

2. D.C. RESISTANCE TEST

On an earthwire sample of minimum 5m length, two contact clamps shall be fixed

with a predetermined Bolt torque. The resistance shall be measured by a Kelvin
double-bridge by placing the clamps initially zero meter and subsequently one
meter apart. The test shall be repeated at least five times and the average value
recorded. The value obtained shall be corrected to the value at 20°C shall
conform to the requirements of this specification.

3. Visual check for joints, scratches etc. and length of earthwire

Earthwire drums shall be rewound in the presence of the inspector. The

inspector shall visually check for joints, scratches etc. and see that the earthwire
generally conforms to the requirements of this specification. The length of
earthwire wound on the drum shall be measured with the help of counter meter
during rewinding.

4. TORSION TEST

The minimum number of twists which a single steel strand shall withstand during
torsion test shall be eighteen for a length equal to 100 times the standard
diameter of the strand. In case the test sample length is less or more than 100
times the standard diameter of the strand, the minimum number of twists will be
proportionate to the length and if number comes in the fraction then it will be
rounded off to next higher whole number.

5. DIMENSIONAL CHECK

The individual strands shall be dimensionally checked to ensure that they

conform to the requirements of this specification.

6. LAY LENGTH CHECK

The lay length shall be checked to ensure that they conform to the requirements
of this specification.

7. GALVANISING TEST

The test procedure shall as specified in IS:4826-1968. The material shall

conform to the requirements of this specification. The adherence of zinc shall be

Technical Specification, Section : SE Page - 42 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

checked by wrapping around a mandrel four times the diameter of steel wire.

8. CHEMICAL ANALYSIS OF ZINC USED FOR GALVANIZING

Samples taken from zinc ingots shall be chemically/spectrographically analysed.

The same shall be in conformity to the requirements stated in this specification.

9. CHEMICAL ANALYSIS OF STEEL

Samples taken from steel ingots/coils/strands shall be chemically/

spectrographically analysed. The same shall be in conformity to the requirements
stated in this specification.

Technical Specification, Section : SE Page - 43 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

ANNEXURE-C
CORONA AND RADIO INTERFERENCE VOLTAGE (RIV) TEST

1. General
Unless otherwise stipulated, all equipment together with its associated connectors,
where applicable, shall be tested for external corona both by observing the voltage
level for the extinction of visible corona under falling power frequency voltage and by
measurement of radio interference voltage (RIV).
2. Test Levels:
The test voltage levels for measurement of external RIV and for corona extinction
voltage are listed under the relevant clauses of the specification.
3. Test Methods for RIV:
3.1 RIV tests shall be made according to measuring circuit as per International Special-
Committee on Radio Interference (CISPR) Publication 16-1(1993) Part -1. The
measuring circuit shall preferably be tuned to frequency with 10% of 0.5 Mhz but
other frequencies in the range of 0.5 MHz to 2 MHz may be used, the measuring
frequency being recorded. The results shall be in microvolts.
3.2 Alternatively, RIV tests shall be in accordance with NEMA standard Publication No.
107-1964, except otherwise noted herein.
3.3 In measurement of, RIV, temporary additional external corona shielding may be
provided. In measurements of RIV only standard fittings of identical type supplied
with the equipment and a simulation of the connections as used in the actual
installation will be permitted in the vicinity within 3.5 meters of terminals.
3.4 Ambient noise shall be measured before and after each series of tests to ensure
that there is no variation in ambient noise level. If variation is present, the lowest
ambient noise level will form basis for the measurements. RIV levels shall be
measured at increasing and decreasing voltages of 85%, 100% and 110% of the
specified RIV test voltage for all equipment unless otherwise specified. The
specified RIV test voltage for 765kV, 400kV, 220kV is listed in the detailed
specification together with maximum permissible RIV level in microvolts.
3.5 The metering instruments shall be as per CISPR recommendation or equivalent
device so long as it has been used by other testing authorities.
3.6 The RIV measurement may be made with a noise meter. A calibration procedure of
the frequency to which noise meter shall be tuned shall establish the ratio of voltage
at the high voltage terminal to voltage read by noisel meter.
4. Test Methods for Visible Corona [applicable for 400kV and above]
The purpose of this test is to determine the corona extinction voltage of apparatus,
connectors etc. The test shall be carried out in the same manner as RIV test
described above with the exception that RIV measurements are not required during
test and a search technique shall be used near the onset and extinction voltage,
when the test voltage is raised and lowered to determine their precise values. The
test voltage shall be raised to 110% of RIV test voltage and maintained there for five
minutes. In case corona inception does not take place at 110%, test shall be
stopped, otherwise test shall be continued and the voltage will then be decreased
slowly until all visible corona disappears. The procedure shall be repeated at least 4

Technical Specification, Section : SE Page - 44 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

times with corona inception and extinction voltage recorded each time. The corona
extinction voltage for purposes of determining compliance with the specification shall
be the lowest of the four values at which visible corona (negative or positive polarity)
disappears. Photographs with laboratory in complete darkness shall be taken under
test conditions, at all voltage steps i.e. 85%, 100%, and 110%. Additional
photographs shall be taken at corona inception and extinction voltages. At least two
views shall be photographed in each case using Panchromatic film with an ASA
daylight rating of 400 with an exposure of two minutes at a lens aperture of f/5.6 or
equivalent. The photographic process shall be such that prints are available for
inspection and comparison with conditions as determined from direct observation.
Photographs shall be taken from above and below the level of connector so as to
show corona on bushing, insulators and all parts of energised connectors. The
photographs shall be framed such that test object essentially, fills the frame with no
cut-off.
In case corona inception does not take place at 110%, voltage shall not be
increased further and corona extinction voltage shall be considered adequate.
4.1 The test shall be recorded on each photograph. Additional photograph shall be
taken from each camera position with lights on to show the relative position of test
object to facilitate precise corona location from the photographic evidence.
4.2 In addition to photographs of the test object preferably four photographs shall be
taken of the complete test assembly showing relative positions of all the test
equipment and test objects. These four photographs shall be taken from four points
equally spaced around the test arrangement to show its features from all sides.
Drawings of the laboratory and test set up locations shall be provided to indicate
camera positions and angles. The precise location of camera shall be approved by
Purchaser‘s inspector, after determining the best camera locations by trial
energisation of test object at a voltage which results in corona.
4.3 The test to determine the visible corona extinction voltage need not be carried out
simultaneously with test to determine RIV levels.
4.4 However, both test shall be carried out with the same test set up and as little time
duration between tests as possible. No modification on treatment of the sample
between tests will be allowed. Simultaneous RIV and visible corona extinction
voltage testing may be permitted at the discretion of Purchaser‘s inspector if, in his
opinion, it will not prejudice other test.
5. Test Records:
In addition to the information previously mentioned and the requirements specified
as per CISPR or NEMA 107-1964 the following data shall be included in test report:
a) Background noise before and after test.
b) Detailed procedure of application of test voltage.
c) Measurements of RIV levels expressed in micro volts at each level.
d) Results and observations with regard to location and type of interference
sources detected at each step.
e) Test voltage shall be recorded when measured RIV passes through 100
microvolts in each direction.
f) Onset and extinction of visual corona for each of the four tests required shall
be recorded.

Technical Specification, Section : SE Page - 45 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

ANNEXURE – D

A. SHORT CIRCUIT FORCES AND SPACER SPAN FOR 765kV GANTRY STRUCTURE

Sl. Max. Span Conductor Ph-Ph Normal SCF per Spacer

No. Configuration Spacing Tension Phase span
I. For Fault Level of 40kA/50 kA for 1 sec.

1. 54.0 mtr QUAD AAC BULL 15 mtr 3.96 T 5.98 T 3.5 mtr
2. 56.0 mtr QUAD AAC BULL 15 mtr 4.52 T 6.77 T 4.0 mtr
3. 87.9 mtr QUAD AAC BULL 15 mtr 8.35 T 11.22 T 6.5 mtr
4. 104.0 mtr QUAD AAC BULL 15 mtr 9.00 T 12.72 T 7.5 mtr
5. 108.61 mtr QUAD AAC BULL 15 mtr 9.00 T 12.72 T 8.0 mtr

B. SHORT CIRCUIT FORCES AND SPACER SPAN FOR 400kV GANTRY STRUCTURE

Sl. Max. Span Conductor Ph-Ph Normal SCF per Spacer

No. Configuration Spacing Tension Phase span
I. For Fault Level of 40 kA for 1 sec.

1. 54 mtr QUAD ACSR 7 mtr 4T 5.64 T 6 mtr

2. 70 mtr TWIN ACSR 7 mtr 4T 5.64 T 5 mtr
3. 54 mtr QUAD ACSR 6 mtr 4T 5.10 T 5 mtr
4. 70 mtr TWIN ACSR 6 mtr 4T 5.10 T 5 mtr
5. 48 mtr QUAD ACSR 6 mtr 4T 4.82T 5 mtr
6. 52.5 mtr QUAD ACSR 6 mtr 4T 4.85T 5 mtr
7. 56.5 mtr QUAD ACSR 6 mtr 4T 4.88T 5 mtr
8. 52.5 mtr TWIN ACSR 6 mtr 4T 4.97T 5 mtr
9. 56.5 mtr TWIN ACSR 6 mtr 4T 5.00 T 5 mtr
II. For Fault Level of 50 kA for 1 sec.

1. 48 mtr QUAD AAC BULL 6 mtr 4T 5.10 T 4 mtr

2. 52.5 mtr QUAD ACSR 6 mtr 4T 5.18 T 4 mtr
3. 56.5 mtr QUAD ACSR 6 mtr 4T 5.20 T 4 mtr
III. For Fault Level of 63 kA for 1 sec.

1. 48 mtr QUAD AAC BULL 6 mtr 4T 6.00 T 4 mtr

2. 52.5 mtr QUAD ACSR 6 mtr 4T 6.33 T 4 mtr
3. 56.5 mtr QUAD ACSR 6 mtr 4T 6.37 T 4 mtr

Technical Specification, Section : SE Page - 46 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION

ANNEXURE – D

C. SHORT CIRCUIT FORCES AND SPACER SPAN FOR 220 kV GANTRY STRUCTURE

Sl. Max. Span Conductor Ph-Ph Normal SCF per Spacer

No. Configuration Spacing Tension Phase span
I. For Fault Level of 40 kA for 1 sec.

1. 54 mtr QUAD ACSR 4.5 mtr 4T 5.00 T 2.5 mtr

2. 54 mtr TWIN ACSR 4.5 mtr 2T 3.50 T 2.5 mtr
3. 74 mtr TWIN ACSR 4.5 mtr 4T 5.00 T 2.5 mtr
4. 54 mtr QUAD ACSR 4.0 mtr 4T 5.70 T 2.5 mtr
5. 54 mtr TWIN ACSR 4.0 mtr 2T 3.50 T 2.5 mtr
6. 74 mtr TWIN ACSR 4.0 mtr 4T 5.70 T 2.5 mtr
7. 48 mtr QUAD ACSR 4.0 mtr 4T 5.30 T 2.5 mtr
8. 52 mtr QUAD ACSR 4.0 mtr 4T 5.35 T 2.5 mtr
9. 68 mtr TWIN ACSR 4.0 mtr 4T 5.20 T 2.5 mtr
10. 56 mtr QUAD ACSR 4.0 mtr 4T 5.50 T 2.5 mtr
11. 72 mtr TWIN ACSR 4.0 mtr 4T 5.27 T 2.5 mtr
II. For Fault Level of 50 kA for 1 sec.

1. 48 mtr QUAD ACSR 4.0 mtr 4T 5.41 T 2.0 mtr

2. 52 mtr QUAD ACSR 4.0 mtr 4T 5.50 T 2.0 mtr
3. 36 mtr TWIN ACSR 4.0 mtr 2T 3.50 T 2.0 mtr

NOTE: ACSR conductor as mentioned above indicates that it is suitable for both ACSR
MOOSE as well as ACSR BERSIMIS conductor.

D. SHORT CIRCUIT FORCES AND SPACER SPAN FOR 132 kV GANTRY STRUCTURE

Sl. Max. Span Conductor Ph-Ph Normal SCF per Spacer

No. Configuration Spacing Tension Phase span
I. For Fault Level of 31.5kA for 1 sec.

1. 36 mtr Twin Moose/ 3 mtr 1T 2.15 T 2.5 mtr

Zebra ACSR
2. 31.5 mtr Twin Moose/ 2.7mtr 1T 2.15 T 2.5 mtr
Zebra ACSR
3. 48 mtr Single Moose/ 3 mtr 1T 2.05 T NA
Zebra ACSR
4. 42 mtr Single Moose/ 2.7 mtr 1T 2.03 T NA
Zebra ACSR

Technical Specification, Section : SE Page - 47 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

STANDARD TECHNICAL DATA SHEETS FOR AAC/ACSR CONDUCTORS,

GS EARTHWIRE AND ALUMINIUM TUBE

1.0 GENERAL

Employer has stardardised the guaranteed technical particulars for the following
AAC/ACSR conductors, Galvanised steel earthwire and aluminum tube. The
contractor shall supply the conductors as per the standard GTP mentioned below.
Any deviation to the following GTP shall be clearly brought out by the bidder in
their bid.

1.1 Guaranteed Technical Particulars (GTP) for conductors:

A. GTP of AAC BULL and AAC TARANTULA conductor:
Sl. Description Unit AAC BULL AAC
TARANTULA
1.0 Applicable Standard IS:398
2.0 Raw Materials
2.1 Steel Wire / Rods
2.1.1 Aluminium
a) Minimum purity of % 99.50 99.50
Aluminium
b) Maximum copper % 0.04 0.04
content
3.0 Aluminum strands after stranding
3.1 Diameter
a) Nominal mm 4.25 5.23

b) Maximum mm 4.29 5.28

c) Minimum mm 4.21 5.18
3.2 Minimum breaking load of strand
a) Before stranding KN 2.23 3.44
b) After stranding KN 2.12 3.27
c) Maximum D.C. Ohm 3.651 3.627
resistance of strand at /KM
20 deg. Centigrade
3.3 Maximum resistance of Ohm 0.00203 0.001341
1 m length of strand at
20 deg. C
4.0 AAC Conductor
4.1. a) Stranding Al – 61/4.25 mm Al – 37/ 5.23 mm
b) Number of Strands
i. 1st Aluminium Layer Nos. 1 1
ii. 2nd Aluminium Layer Nos. 6 6

Technical Specification, Section : SE Page - 48 of 58

C / ENGG / SPEC / ERC REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

Sl. Description Unit AAC BULL AAC

TARANTULA
iii. 3rd Aluminium Layer Nos. 12 12
iv. 4th Aluminium Layer Nos. 18 18
v. 5th Aluminium Layer Nos. 24 -
4.2 Sectional Area of Sq. 865.36 794.80
aluminium mm
4.3 Total sectional area Sq. 865.36 794.80
mm
4.4 Approximate Weight Kg/m 2.4 2.191
4.5 Diameter of the mm 38.25 36.60
conductor
4.6 UTS of the conductor kN 139 (Min.) 120 (Min.)
4.7 Lay ratio of the mm Max Min Max Min
conductor
a) 6 wire Aluminium layer mm 16 10 16 10

b) 12 wire Aluminium mm 16 10 16 10
layer
c) 18 wire Aluminium mm 16 10 14 10
layer
d) 24 wire Aluminium mm 14 10 - -
layer
4.8 DC resistance of the ohm/ 0.03340 0.03628
conductor at 20°C km
4.9 Standard length of the m 1000 1000
conductor
4.10 Tolerance on Standard % (+/-) 5 (+/-) 5
length
4.11 Direction of lay of Right Hand Right Hand
outer layer
4.12 Linear mass of the conductor
a) Standard kg/ 2400 2192
km
b) Minimum kg/ 2355 2150
km
c) Maximum kg/ 2445 2234
km
4.13 Modulus of Elasticity Kg/sq 4709 (Initial) 4709 (Initial)
.mm 5869 (Final) 5869 (Final)
4.14 Co-efficient of Linear Per 23.0x10-6 23.0x10-6
Expansion Deg.
C
4.15 Minimum Corona KV 508 320
Extinction Voltage (rms)
4.16 RIV at 1 Mhz Micro Less than 1000 Less than 1000 at
volts at 508 kV (rms) 320 kV (rms)
5.0 Drum Dimensions Generally conforms to IS:1778

Technical Specification, Section : SE Page - 49 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

Sl. Description Unit AAC BULL AAC

TARANTULA
a) Flange Diameter mm 1855 1855
b) Traverse width mm 925 925
c) Barrel Diameter mm 850 850
d) Flange thickness mm 50x50 50x50

B. GTP of ACSR BERSIMIS and ACSR MOOSE conductor:

Sl. Description Unit ACSR ACSR MOOSE
BERSIMIS
1.0 Applicable Standard IS:398 / IEC - 61089
2.0 Raw Materials
2.1 Aluminium
a) Minimum purity of % 99.50 99.50
Aluminium
b) Maximum copper % 0.04 0.04
content
2.2 Steel wires/ rods
a) Carbon % 0.50 to 0.85 0.50 to 0.85
b) Manganese % 0.50 to 1.10 0.50 to 1.10
c) Phosphorous % Not more than Not more than
0.035 0.035
d) Sulphur % Not more than Not more than
0.045 0.045
e) Silicon % 0.10 to 0.35 0.10 to 0.35
(Max.) (Max.)
2.3 Zinc
a) Minimum purity of Zinc % 99.95 99.95
3.0 Aluminum strands after stranding
3.1 Diameter
a) Nominal mm 4.57 3.53

b) Maximum mm 4.61 3.55

c) Minimum mm 4.53 3.51
3.2 Minimum breaking load of strand
a) Before stranding KN 2.64 1.57
b) After stranding KN 2.51 1.49
c) Maximum D.C. Ohm/ 1.738 2.921
resistance of strand at KM
20 deg. Centigrade
3.3 Maximum resistance of Ohm 0.001738 0.002921
1 m length of strand at
20 deg. C

Technical Specification, Section : SE Page - 50 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

Sl. Description Unit ACSR ACSR MOOSE

BERSIMIS
4.0 Steel strand after stranding
4.1 Diameter
a) Nominal mm 2.54 3.53
b) Maximum mm 2.57 3.60
c) Minimum mm 2.51 3.46
4.2 Minimum breaking load of strand
a) Before stranding KN 6.87 12.86
b) After stranding KN 6.53 12.22
4.3 Galvanising
a) Minimum weight of gm 260 260
zinc coating per sq.m.
b) Minimum number of Nos. 2 dips of one 2 dips of one
dips that the minute & 1 dip of minute & 1 dip of
galvanised strand can half minute half minute
withstand in the
standard preece test
c) Min. No. of twists in Nos 16 (After stranding) 16 (After stranding)
guage length equal 18 (Before 18 (Before
100 times the dia. of stranding) stranding)
wire which the strand
can withstand in the
torsion test (after
stranding)
5.0 ACSR Conductor
5.1.a) Stranding Al -42/4.57 mm+ Al -54/3.53 mm+
Steel-7/2.54 mm Steel-7/3.53 mm
b) Number of Strands
i. Steel centre Nos. 1 1
ii. 1st Steel Layer Nos. 6 6
iii. 1st Aluminium Layer Nos. 8 12
iv. 2nd Aluminium Layer Nos. 14 18
v. 3rd Aluminium Layer Nos. 20 24
5.2 Sectional Area of Sq. 689.50 528.50
aluminium mm
5.3 Total sectional area Sq. 725.00 597.00
mm
5.4 Approximate Weight Kg/m 2.181 2.004
5.5 Diameter of the mm 35.05 31.77
conductor
5.6 UTS of the conductor kN 154 (Min.) 161.20 (Min.)
5.7 Lay ratio of the mm Max Min Max Min
conductor

Technical Specification, Section : SE Page - 51 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

Sl. Description Unit ACSR ACSR MOOSE

BERSIMIS
a) Outer Steel layer mm 24 16 18 16

b) 8/12 wire Aluminium mm 17 10 14 12

layer
c) 14/ 18 wire Aluminium mm 16 10 13 11
layer
d) 20/24 wire Aluminium mm 13 10 12 10
layer
5.8 DC resistance of the ohm/ 0.04242 0.05552
conductor at 20°C km
5.9 Standard length of the m 1800 1800
conductor
5.10 Tolerance on Standard % (+/-) 5 (+/-) 5
length
5.11 Direction of lay of - Right Hand Right Hand
outer layer
5.12 Linear mass of the conductor
a) Standard kg/ 2181 2004
km
b) Minimum kg/ 2142 1965
km
c) Maximum kg/ 2221 2045
km
5.13 Modulus of Elasticity Kg/sq 6860
(Final State) .mm
5.14 Co-efficient of Linear Per 21.5x10-6 19.3x10-6
Expansion Deg.
C
5.15 Minimum Corona KV 320 320
Extinction Voltage (rms)
5.16 RIV at 1 Mhz under Micro Max. 1000 at Max. 1000 at 320
dry condition volts 320 kV (rms) kV (rms)
6.0 Drum Dimensions Generally conforms to IS:1778
a) Flange Diameter mm 1800 1800
b) Traverse width mm 950 950
c) Barrel Diameter mm 650 650
d) Flange thickness mm 50x50 50x50

C. B. GTP of ACSR ZEBRA and ACSR PANTHER conductor:

Sl. Description Unit ACSR ZEBRA ACSR PANTHER
1.0 Applicable Standard IS:398 / IEC-61089
2.0 Raw Materials
2.1 Aluminium
a) Minimum purity of % 99.50 99.50
Aluminium

Technical Specification, Section : SE Page - 52 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

Sl. Description Unit ACSR ZEBRA ACSR PANTHER

b) Maximum copper % 0.04 0.04
content
2.2 Steel wires/ rods
a) Carbon % 0.50 to 0.85 0.50 to 0.85
b) Manganese % 0.50 to 1.10 0.50 to 1.10
c) Phosphorous % Not more than Not more than
0.035 0.035
d) Sulphur % Not more than Not more than
0.045 0.045
e) Silicon % 0.10 to 0.35 0.10 to 0.35
(Max.) (Max.)
2.3 Zinc
a) Minimum purity of Zinc % 99.95 99.95
3.0 Aluminum strands after stranding
3.1 Diameter
a) Nominal mm 3.18 3.00

b) Maximum mm 3.21 3.03

c) Minimum mm 3.15 2.97
3.2 Minimum breaking load of strand
a) Before stranding KN 1.29 1.17
b) After stranding KN 1.23 1.11
3.3 Maximum resistance of Ohm 0.003626 0.004107
1 m length of strand at
20 deg. C
4.0 Steel strand after stranding
4.1 Diameter
a) Nominal mm 3.18 3.00
b) Maximum mm 3.24 3.06
c) Minimum mm 3.12 2.94
4.2 Minimum breaking load of strand
a) Before stranding KN 10.43 9.29
b) After stranding KN 9.91 8.85
4.3 Galvanising
a) Minimum weight of gm 260 260
zinc coating per sq.m.
b) Minimum number of Nos. 2 dips of one 2 dips of one
dips that the minute & 1 dip of minute & 1 dip of
galvanised strand can half minute half minute
withstand in the
standard preece test

Technical Specification, Section : SE Page - 53 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

Sl. Description Unit ACSR ZEBRA ACSR PANTHER

c) Min. No. of twists in Nos 16 (After 16 (After stranding)
guage length equal stranding) 18 (Before
100 times the dia. of 18 (Before stranding)
wire which the strand stranding)
can withstand in the
torsion test (after
stranding)
5.0 ACSR Conductor
5.1.a) Stranding Al -54/3.18 mm+ Al -30/3.00 mm+
Steel-7/3.18 mm Steel-7/3.00 mm
b) Number of Strands
i. Steel centre Nos. 1 1
ii. 1st Steel Layer Nos. 6 6
iii. 1st Aluminium Layer Nos. 12 12
iv. 2nd Aluminium Layer Nos. 18 18
v. 3rd Aluminium Layer Nos. 24 NA
5.2 Sectional Area of Sq. 428.9 212.10
aluminium mm
5.3 Total sectional area Sq. 484.5 261.50
mm
5.4 Approximate Weight Kg/m 1.621 0.974
5.5 Diameter of the Mm 28.62 21.00
conductor
5.6 UTS of the conductor kN 130.32 (Min.) 89.67 (Min.)
5.7 Lay ratio of the mm Max Min Max Min
conductor
a) Outer Steel layer mm 28 13 28 16

b) 12 wire Aluminium mm 17 10 16 10
layer
c) 18 wire Aluminium mm 16 10 14 10
layer
d) 24 wire Aluminium mm 14 10 NA
layer NA
5.8 DC resistance of the ohm/ 0.06868 0.140
conductor at 20°C km
5.9 Standard length of the m 1800 1800
conductor
5.10 Tolerance on Standard % (+/-) 5 (+/-) 5
length
5.11 Direction of lay of Right Hand Right Hand
outer layer
5.12 Linear mass of the conductor
a) Standard kg/ 1621 974
km
b) Minimum kg/ 1589 954

Technical Specification, Section : SE Page - 54 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

Sl. Description Unit ACSR ZEBRA ACSR PANTHER

km
c) Maximum kg/ 1653 993
km
5.13 Modulus of Elasticity Kg/sq 8158
.mm
5.14 Co-efficient of Linear Per 19.3x10-6 17.8x10-6
Expansion Deg.
C
5.15 Minimum Corona KV 154 92
Extinction Voltage (rms)
5.16 RIV at 1 Mhz Micro Less than 1000 Less than 500
volts at 154 kV (rms) at 92 kV (rms)
6.0 Drum Dimensions Generally conforms to IS:1778
a) Flange Diameter mm 1850 1850
b) Traverse width mm 925 925
c) Barrel Diameter mm 650 650
d) Flange thickness mm 50x50 50x50

1.2 Guaranteed technical particulars of Galvanised Steel Earthwire

Description Sl. no. Unit Standard Values
1.0 Raw Materials
1.1 Steel wires / rods
a) Carbon % Not more than 0.55
b) Manganese % 0.40 to 0.90
c) Phosphorous % Not more than 0.04
d) Sulphur % Not more than 0.04
e) Silicon % 0.15 to 0.35
1.2 Zinc
a) Minimum purity of Zinc % 99.95
2.0 Steel strands
2.1 Diameter
a) Nominal mm 3.66
b) Maximum mm 3.74
c) Minimum mm 3.58
2.2. Minimum breaking load of strand
a) After stranding KN 10.58
2.3 Galvanising
a) Minimum weight of zinc coating gms. 275
per sq.m. after stranding
b) Minimum number of dips that the Nos. 3 dips of 1 minute and
galvanized strand can withstand

Technical Specification, Section : SE Page - 55 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

in the standard preece test one dip of ½ minute

c) Minimum number of twists in a Nos. 18
gauge length equal to 100 times
diameter of wire which the
strand can withstand in the
torsion test, after stranding
3.0 Stranded Earth wire
3.1 UTS of Earth wire KN 68.4 (min.)
3.2 Lay length of outer steel layer
a) Standard mm 181
b) Maximum mm 198
c) Minimum mm 165
3.3 Maximum DC resistance of Ohm/km 3.375
earth wire at 200 C
3.4 Standard length of earth wire M 2000 or actual quantity
whichever is less.
3.5 Tolerance on standard length % ±5
3.6 Direction of lay for outside Right hand
layer
3.7 Linear mass
a) Standard Kg/km 583
b) Maximum Kg/km 552
c) Minimum Kg/km 600
3.8 Overall diameter mm 10.98

1.3 Guaranteed Technical Parameters of Aluminum Tube

A. GTP for 3” IPS & 4” IPS AL. TUBE

Sl. No. Description 3” AL. TUBE 4” AL. TUBE

1. Size 3" IPS (EH Type) 4" IPS (EH Type)
2. Material Aluminium Alloy 6101 T6 confirms to
63401 WP (range 2) of IS 5082 : 1998
3. Chemical Composition
i) Cu 0.05 Max
ii) Mg 0.4 to 0.9
iii) Si 0.3 to 0.7
iv) Fe 0.5 Max
v) Mn 0.03 Max
Vi) Al Remainder
4. Outer diameter 88.90 mm 114.2 mm
5. Tolerance on outer +2.2 mm, - 0.0 mm +2.2 mm, - 0.0 mm
diameter
6. Thickness 7.62 mm 8.51 mm
7. Tolerance on thickness +2.2 mm, - 0.0 mm +2.2 mm, - 0.0 mm
8. Cross-sectional area 1945.76 sq.mm 2825.61 sq.mm
9. Weight 5.25 kg/m 7.7 kg/m
10. Moment of Inertia 1621589.99 mm4 3972577.97 mm4
11. Section Modulus 36481.21 mm3 69572.29 mm3

Technical Specification, Section : SE Page - 56 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

12. Minimum Ultimate Tensile 20.5 Kg/sq.mm

Strength
13. Temperature co-efficient of 0.00364 per Deg.C
resistance
14. Minimum Electrical 55% of IACS
Conductivity at 20 deg.C
15. Linear Temperature Co- 0.000023
efficient of Expansion (20
Deg.C -200 Deg.C)
16. Modulus of Elasticity 6700 Kg/sq.mm
17. Minimum Elongation on 50 10%
mm
18. Thermal Conductivity at 100 0.43 Calories/sec/sq.mm/cm/deg.C
Deg.C
19. Minimum 0.2% proof stress 17.34 Kg/sq.mm
20 Minimum Yield point 17.50 Kg/sq.mm 17.50 Kg/sq.mm
21 Minimum Breaking Strength 20.42 Kg/sq.mm 20.42 Kg/sq.mm
B. GTP for 4.5” IPS & 5” IPS AL. TUBE

Sl. No. Description 4.5” AL. TUBE 5” AL. TUBE

1. Size 4.5" IPS (EH Type) 5" IPS
2. Material Aluminium Alloy 6101 T6 confirms to
63401 WP (range 2) of IS 5082 : 1998
3. Chemical Composition
i) Cu 0.05 Max
ii) Mg 0.4 to 0.9
iii) Si 0.3 to 0.7
iv) Fe 0.5 Max
v) Mn 0.03 Max
Vi) Al Remainder
4. Outer diameter 120.0 mm 141.3 mm
5. Tolerance on outer +1.5 mm, +2.8 mm,
diameter - 0.0 mm - 0.0 mm
6. Thickness 12.0 mm 9.53 mm
7. Tolerance on thickness +1.0 mm, +0.8 mm,
- 0.0 mm - 0.0 mm
8. Cross-sectional area 4071.50 sq.mm 3945.11 sq.mm
9. Weight 10.993 kg/m 10.652 kg/m
10. Moment of Inertia 6011958.58 mm4 8610787.65 mm4
3
11. Section Modulus 100199.31 mm 121879.51 mm3
12. Minimum Ultimate Tensile 20.5 Kg/sq.mm
Strength
13. Temperature co-efficient of 0.00364 per Deg.C
resistance
14. Minimum Electrical 55% of IACS
Conductivity at 20 deg.C
15. Linear Temperature Co- 0.000023
efficient of Expansion (20
Deg.C -200 Deg.C)
16. Modulus of Elasticity 6700 Kg/sq.mm
17. Minimum Elongation on 50 10%

Technical Specification, Section : SE Page - 57 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 SECTION - (SE)
SWITCHYARD ERECTION
ANNEXURE-E

mm
18. Thermal Conductivity at 100 0.43 Calories/sec/sq.mm/cm/deg.C
Deg.C
19. Minimum 0.2% proof stress 17.34 Kg/sq.mm
20 Minimum Yield point 14.50 Kg/sq.mm 17.50 Kg/sq.mm
21 Minimum Breaking Strength 17.50 Kg/sq.mm 20.42 Kg/sq.mm

Technical Specification, Section : SE Page - 58 of 58

C / ENGG / SPEC / SE REV. NO: 10 (Apr’16)
 800 mm

450 mm

2 mm thick MS Plate
1000 mm

40 mm dia pipe

GROUND LEVEL
600 mm

NOTE : DIMENSIONS ARE INDICATIVE ONLY.

IT MAY VARY AS PER SITE REQUIREMENT.

( A Government of India Enterprise )

18/02/2008 Drawing No.: Rev.

C/ENG/STD/BAY NAME PLATE 00
CKD BY PRPD BY Date
 SECTION: STRUCTURE

Table of contents

Clause No. Description Page No.

1.0 GENERAL 1
2.0 DESIGN REQUIREMENTS FOR STRUCTURES NOT 2
COVERED IN STANDARDISED LIST
3.0 DESIGN DRAWINGS, BILL OF MATETRIALS AND 4
DOCUMENTS
4.0 FABRICATION AND ERECTION 5
5.0 BOLTING 5
6.0 WELDING 5
7.0 FOUNDATION BOLTS 6
8.0 STABILITY OF STRUCTURE 6
9.0 GROUTING 6
10.0 GALVANISING 6
11.0 TOUCH-UP PAINTING 6
12.0 INSPECTION BEFORE DISPATCH 7
13.0 TEST CERTIFICATE 7
14.0 SAFETY PRECAUTIONS 7
 SECTION: STRUCTURES

1.0 GENERAL

The scope of specification covers fabrication, proto-assembly, supply and erection

of galvanised steel structures for towers, beams, lightning masts and equipment
support structures. If specified in section – Project, design of steel structure shall
also be in the scope of contractor. The structures shall be of pipe type or lattice
type as per Bid Proposa Sheet. Lattice structures shall be fabricated from
structural steel conforming to IS: 2062 (latest). All pipe structures shall be
fabricated from GI pipe conforming to YST 22 or of higher grade as per IS 806.

Line diagrams of Towers, beams, Lightning masts, equipment support structures

are enclosed with the tender document. The fabrication drawings along with
BOMs for these structures shall be provided to the successful bidder after the
award. However structure, which are to be designed at detailed engineering stage
by the employer, only line diagram shall be provided by POWERGRID and
fabrication drawing shall be prepared by the Contractor. Support structure for
circuit breaker shall be designed by the Manufacturer. Any other structure
necessary to suit the layout for a particular substation to complete the work in all
respect shall be designed by the employer / contractor at detailed Engineering
stage.

Equipment support structure standardization has been carried out by the employer
with the provision of stool to facilitate interchangeability of equipments at a later
stage. Stools shall be provided by the Contractor between the equipment and its
support structure to match the bus bar height. The top of stool shall be connected
to the equipment and the bottom of the stool shall be connected to the Base
support structure.

The scope shall include supply and erection of all types of structures including
bolts, nuts, washers, step bolts, inserts in concrete, gusset plates, equipment
mounting bolts, structure earthing bolts, foundation bolts, spring washers, fixing
plates and any other items as required to complete the job.

The connection of all structures to their foundations shall be with base plates and
embedded anchor/foundation bolts. All steel structures including
anchor/foundation bolts shall be fully galvanized. The weight of the zinc coating
shall be at least 610 gm/sq.m. Zinc coating for costal areas, if defined in section –
Project shall not be less than 900gm/sq.m

Suitable modification shall be carried out in the drawings of equipment

support structures by the Contractor in order to suit fixation of accessories
such as marshalling boxes, MOM boxes, Control Cabinets, Junction box,

Technical Specification, Section: STR -1-

C/ENGG/SPEC/STR Rev No.: 06
 surge counter, etc. in the standard structure fabrication drawings. Nothing
extra shall be payable or recoverable from the contractor on account of
modification in support structures.

2.0 DESIGN REQUIREMENTS FOR STRUCTURES (To be referred only for

structures to be designed by the Contractor)

2.1 For design of steel structures loads such as dead loads, live loads, wind loads
etc. shall be based on IS:875,Parts I to V.

2.2 For materials and permissible stresses IS: 802, Part-I, Section-2 shall be
followed in general. However, additional requirements given in following
paragraphs shall also be considered.

2.3 Minimum thickness of galvanized tower member shall be as follows:

Members Minimum thickness
(mm)
Leg members, Ground wire
Peak members/Main members 5

Other members 4

Redundant members 4

Size and thickness of gusset plate, pack washer and pack plate shall be as per
requirement.

2.4 Maximum slenderness ratios for leg members, other stressed members and
redundant members for compression force shall be as per IS-802.

2.5 Minimum distance from hole center to edge shall be 1.5 x bolt diameter.
Minimum distance between center to center of holes shall be 2.5 x bolt
diameter.

2.6 All bolts shall be M16 or higher as per design requirement.

2.7 Step Bolts

In order to facilitate inspection and maintenance, the structures shall be

provided with climbing devices. Each tower shall be provided with M16 step
bolts 175mm long spaced not more than 450mm apart, staggered on faces on
one leg extending from about 0.5 meters above plinth level to the top of the
tower. The step bolt shall conform to IS: 10238.

2.8 Design Criteria

Technical Specification, Section: STR -2-

C/ENGG/SPEC/STR Rev No.: 06
 a) All structures shall be designed for the worst combination of dead loads, live
loads, wind loads as per code IS:875, seismic forces as per code IS:1893,
loads due to deviation of conductor, load due to unbalanced tension in
conductor, torsional load due to unbalanced vertical and horizontal forces,
erection loads, short circuit forces including “snatch” in the case of bundled
conductors etc. Short circuit forces shall be calculated considering a fault level
of 40 kA, 50kA, 63kA or as applicable. IEC-60865 may be followed for
evaluation of short circuit forces.

b) Switchyard gantry structures shall be designed for the two conditions i.e.
normal condition and short circuit condition. In both conditions the design of
all structures shall be based on the assumption that stringing is done only on
one side i.e. all the three (phase) conductors broken on the other side.
Factor of safety of 2.0 under normal conditions and 1.5 under short circuit
condition shall be considered for the design of switchyard structures.

c) Vertical load of half the span of conductors/string and the earth wires on
either side of the beam shall be taken into account for the purpose of design.
Weight of man with tools shall be considered as 150 kgs. for the design of
structures.

d) Terminal/line take off gantries shall be designed for a minimum conductor

tension of 9 metric tonnes per phase for 765kV, 4 metric tonnes per phase for
400kV, 2 metric tonnes per phase for 220kV and 1 metric tonne per phase for
132 kV or as per requirements whichever is higher . The distance between
terminal gantry and dead end tower shall be taken as 200 metres for
765/400/220kV and 100m for 132KV. The design of these terminal gantries
shall also be checked considering +/- 30 deg deviation of conductor in both
vertical and horizontal planes. For other gantries the structural layout
requirements shall be adopted in design.

e) The beams shall be connected with towers/ columns by bolted joints.

f) All Pipe support structures used for supporting equipments shall be designed
for the worst combination of dead loads, erection load. Wind load/seismic
forces, short circuit forces and operating forces acting on the equipment and
associated bus bars as per IS:806. The material specification shall be as per IS:
1161 read in conjunction with IS: 806.

g) If luminaries are proposed to be fixed on gantries, then the proper loading for
the same shall be considered while designing. Also holes for fixing the
brackets for luminaries should be provided wherever required.

h) Foundation bolts shall be designed for the loads for which the structures are
designed.

Technical Specification, Section: STR -3-

C/ENGG/SPEC/STR Rev No.: 06
 i) Height of Lightning masts shall be as per approved structure layout and
designed for diagonal wind condition. Lightning masts shall be provided with
plateforms for mounting lighting fixtures and a structural steel ladder within
its base up to the level of plateform. The ladder shall be provided with
protection rings. The platforms shall also have protection railing. The details
of lighting fixtures would be as per the approved drawings.

3.0 DESIGN DRAWINGS, BILL OF MATETRIALS AND DOCUMENTS

3.1 Structures, for which line diagram has already been provided along with
tender documents, fabrication drawings (structure assembly drawing) along
with Bill of Material shall be provided to the successful bidder after award
based on which structures shall be supplied. Fabrication drawings issued to
the contractor for any project shall be valid for other projects also if wind
speed of the area is same. These drawings are also available on the
POWERGRID web site and can be downloaded from the web site. Hard
copies, if needed, can be obtained from employer. These drawings shall be
good for fabrication and inspection of steel structures for any substation.
Release for construction stamp for particular substation is not required.
Replacing MS section with higher section or replacing MS section with HT
section of same size due to non availability of particular section shall not
require employer’s approval and this can be done without any additional
financial implication to the employer.

3.2 STRUCTURES DESIGNED DURING DETAILED ENGINEERING:

3.2.1 In case deisign of structure is to be done by employer, only line diagram of the
structure shall be provided to the contractor and fabrication drawing shall be prepared
by contractor based on line diagram and submitted for approval.

3.2.2 In case design of structure is covered in the scope of contract , the contractor shall
submit design alongwith line diagram for approval and based on approved line
diagram, fabrication drawing shall be prepared and submitted for
employers’approval. The line diagram should indicate not only profile, but
section, numbers and sizes of bolts and details of typical joints.

3.2.3 The fabrication drawings to be prepared and furnished by the Contractor shall
be based on line diagram provided by employer or the design approved by the
employer. These fabrication drawings shall indicate complete details of
fabrication and erection including all erection splicing details and typical
fabrication splicing details, lacing details, weld sizes and lengths. Bolt details
and all customary details in accordance with standard structural engineering
practice whether or not given by the employer. The fabrication drawings and
bill of material based on fabrication drawing shall be submitted to the
employer for approval. Approved bill of material prepared based on
fabrication drawing shall be the basis for payment.

Technical Specification, Section: STR -4-

C/ENGG/SPEC/STR Rev No.: 06
3.3 Such approval shall, however, not relieve the Contractor of his responsibility
for the safety and durability of the structure and good connections and any
loss or damage occurring due to defective fabrication, design or workmanship
shall be borne by the Contractor.

4.0 FABRICATION AND ERECTION

4.1 The fabrication and erection works shall be carried out generally in
accordance with IS 802. A reference however may be made to IS 800 in case
of non-stipulation of some particular provisions in IS 802. All materials shall
be completely shop fabricated and finished with proper connection material
and erection marks for ready assembly in the field.

4.2 The component parts shall be assembled in such a manner that they are neither
twisted nor otherwise damaged and shall be so prepared that the specified
camber, if any, is provided. In order to minimize distortion in member the
component parts shall be positioned by using the clamps, clips, dogs, jigs and
other suitable means and fasteners (bolts and welds) shall be placed in a
balanced pattern. If the individual components are to be bolted, paralleled and
tapered drifts shall be used to align the part so that the bolts can be accurately
positioned.

4.3 Sample towers, beams, lightning masts and equipment support structures may
be trial assembled in fabrication shop in order to ensure fitment of various
members and to avoid problems during erection.

4.4 The Contractor should arrange on his own all plant and equipment, welding
set, tools and tackles, scaffolding, trestles equipments and all other accessories
and ancillaries required for carrying out erection without causing any stresses
in the members which may cause deformation and permanent damage. Minor
modification, if any, required during erection shall be done at site with the
approval of Engineer – in- charge.

5.0 BOLTING

i) Every bolt shall be provided with a washer under the nut so that no part of the
threaded portion of the bolt is within the thickness of the parts bolted together.
ii) In case of fasteners, the galvanizing shall confirm to IS-1367(Part 13). The
spring washer shall be electro galvanized as per Grade IV of IS-1573.

6.0 WELDING

The work shall be done as per approved fabrication drawings which shall
clearly indicate various details of joints to be welded, type of weld, length and
size of weld, Symbols for welding on erection and shop drawings shall be

Technical Specification, Section: STR -5-

C/ENGG/SPEC/STR Rev No.: 06
 according to IS:813. Welding shall be carried out in accordance with IS:816.

7.0 FOUNDATION BOLTS

7.1 Foundation bolts for the towers and equipment supporting structures shall be
embedded in first stage concrete while the foundation is cast. The Contractor
shall ensure the proper alignment of these bolts to match the holes in the base
plate.

7.2 The Contractor shall be responsible for the correct alignment and leveling of
all steel work on site to ensure that the towers/structures are plumb.

7.3 All foundation bolts for lattice structure, pipe structure are to be supplied by
the Contractor.

7.4 All foundation bolts shall be provided with two no. standard nuts of class 5
confirming to IS:1363/1367/6639, one check nut of class 4 confirming to IS:1364,
one anchore plate at the bottom of foundation bolt and one plain washer.

7.5 All foundation bolts shall conform to IS 5624, however, the material, shall be
MS conforming to IS:2062/ SAE:1018.

8.0 STABILITY OF STRUCTURE

The Contractor shall be responsible for the stability of the structure at all
stages of its erection at site and shall take all necessary measures by the
additions of temporary bracings and guying to ensure adequate resistance to
wind and also to loads due to erection equipment and their operations.

9.0 GROUTING

The method of grouting the column bases shall be subject to approval of

employer and shall be such as to ensure a complete uniformity of contact over
the whole area of the steel base plate. No additional payment for grouting
shall be admissible.

10.0 GALVANISING

All structural steel works, equipment support structures and foundation bolts
shall be galvanized after fabrication. The galvanization shall be done as per
requirement of IS 4579. Purity of zinc to be used shall be 99.95% as per
IS:209.

11.0 TOUCH-UP PAINTING

Minor defects in hot dip galvanized members shall be repaired by applying

Technical Specification, Section: STR -6-

C/ENGG/SPEC/STR Rev No.: 06
 zinc rich primer and two coats of enamel paint to the satisfaction the employer
before erection.

12.0 INSPECTION BEFORE DISPATCH

Each part of the fabricated steel work shall be inspected as per approved
quality plans and certified by the employer or his authorized representative as
satisfactory before it is dispatched to the erection site. Such certification shall
not relieve the Contractor of his responsibility regarding adequacy and
completeness of fabrication.

13.0 TEST CERTIFICATE

Copies of all test certificates relating to material procured by the Contractor

for the works shall be submitted during inspection.

14.0 SAFETY PRECAUTIONS

The Contractor shall strictly follow at all stages of fabrication, transportation

and erection of steel structures, raw materials and other tools and tackles, the
stipulations contained in Indian Standard Code for Safety during erection of
structural steel work-IS:7205.

15.0 All tests mentioned in standard field quality plans shall have to be carried out
and conformity of materials and workmanship shall be ascertained.

Technical Specification, Section: STR -7-

C/ENGG/SPEC/STR Rev No.: 06
 STANDARD
TECHNICAL SPECIFICATION
FOR
SUBSTATION- CIVIL WORKS

SUB-STATION CIVIL WORKS – REV 11A

पावर ि ड कारपोरे शन ऑफ़ इं िडया िलिमटेड

(भारत सरकार का उ म)
POWER GRID CORPORATION OF INDIA LIMITED
(A GOVERNMENT OF INDIA ENTERPRISE)

Document Code no.:

TECHNICAL SPECIFICATION: CIVIL WORKS
C/ENGG/SPEC/CIVIL/REV -11A/JUN’18
 CONTENTS: TECHNICAL SPECIFICATION CIVIL WORK – 11A

Description Page No.

Salient changes made over previous TS Rev-11A 4
Salient changes made over previous TS Rev-11 5
1.0 General 6
2.0 Geotechnical Investigation 7
2.1 Scope 7
2.2 Bore Holes 8
2.3 Trial Pits 8
2.4 Electrical Resistivity Test 8
2.5 Plate Load Test 10
2.6 Water Sample 10
2.7 Back Filling Of Bore Holes 11
2.8 Laboratory test 11
2.9 Test results and Reports 11
3.0 Standard drawings 13
3.1 Road, road culverts and rail cum road 14
3.2 Drains 15
3.3 Chain link fencing and switchyard gate 15
3.4 Rain water harvesting 15
3.5 Cable trenches 16
3.6 Boundary wall 16
4.0 Stone spreading and anti-weed treatment 20
5.0 Excavation and backfill of foundation 22
6.0 Cement 23
7.0 Chemical Admixture & Additives 24
8.0 Reinforced Concrete Cement 24
8.1 Design Mix Concrete 24
8.2 Volumetric Mix Concrete 25
9.0 Reinforcement Steel 25
10.0 Drawing and design to be developed by contractor/ employer during engineering 26
10.1 Control room building 26
10.2 GIS building / GIS hall 27
10.3 Building design consideration 29
10.4 Design loads 31
10.5 Design of foundation for building & other switchyard structures 33
10.6 Design of transformer and reactor foundation 34
10.7 Design of fire protection wall 35
10.8 Design of water tanks, channels, sumps, trenches and other underground structures 35
10.9 Internal finish schedule for control room building & GIS hall either RCC/PEB 36
10.10 False ceiling details 41
10.11 Water proofing treatment 42
10.12 Specification for plumbing, sanitation & water supply etc. 43
Technical Specification, Section: Civil Works Page 1 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 11.0 Material specification for all pre-engineered buildings 48
11.1 Structural Steel Members 48
11.2 Purlins and Girts Member 49
11.3 Roof & wall sheeting 49
11.4 Sheeting fasteners 49
11.5 Sealer 49
11.6 Closures 50
11.7 Flashing and trim 50
11.8 Wall lights 50
11.9 Connections 51
11.10 Gutters and down spouts 51
12.0 Vendors & MQP for PEB buildings 51
13.0 General specification for buildings 52
14.0 External water supply from bore-well to fire water tank/Control building and / or 58
Transit Camp
15.0 Submission 58
16.0 Miscellaneous requirements 59
17.0 Interfacing 60
18.0 Statutory rules 60
19.0 Specification for site Levelling 61
20.0 Mode of measurement 71
20.1 Earthwork 71
20.2 Plain cement concrete (PCC) 72
20.3 RCC 73
20.4 Reinforcement steel 73
20.5 Stone filling 73
20.6 Miscellaneous structural steel 73
20.7 Roads 74
20.8 Antiweed treatment 74
20.9 Stone spreading in switchyard 74
20.10 Chain link fencing and gate 75
20.11 Cable trench crossing and road culverts through hume pipe 75
20.12 Buildings 75
20.13 Rain water harvesting 76
20.14 Rail cum road 76
20.15 Septic tank and soak pit 76
20.16 Fire water tank 77
20.17 External water supply from bore well to fire water tank…, 77
20.18 External sewage 77
20.29 Cable trenches 77
20.20 Drains 77
20.21 Soil treatment 78
20.22 Pile foundation 78
20.23 Contractor designed foundation 78
20.24 Billing breakup 78
20.25 Pipe supports and deluge valve housing 78

Technical Specification, Section: Civil Works Page 2 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 20.26 Boundary wall 78
20.27 Site levelling 79

Technical Specification, Section: Civil Works Page 3 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 PREFACE
Salient changes made over previous TS -11
S No. Ref Clause of Brief Description
Rev. 11A
1 1.1 Mention of “Approval of Employer for design/drawings”

Insertion of order of precedence for Technical Specification, BIS code & CPWD
specification

2 2.9.2.5 Signing and stamping of soil report by qualified Geotechnical engineer/ consultant

3 3.2.2, Layouts to be proposed by the contractor and approved by POWERGRID before

3.4.2, execution
3.5.1

4 3.6 Weep holes/ gratings in boundary walls

5 3.6.3.7 “Cage” to be replaced with “design and drawing”

6 5.6 (a) Supervision and safety of existing structures during dismantling works

7 8.0 Mentioning of IS 456-200 (latest) for RCC works.

8 8.1 & 8.2 Description of minor works for volumetric concreting.

Clarity regarding Design mix added.

9 10.2 “Contractor” word added with vendor

10 10.2.6 RCC pedestal to finish at floor level

11 10.2.12 Clarity w.r.t floor finish of GIS hall

12 10.3.18 “working stress method” replaced by “limit state method” for PEB design

13 10.3.16 All design and detailing (including ductile) as per latest BIS standards

14 20.0 Reference of IS 1200 in case of ambiguity.

Technical Specification, Section: Civil Works Page 4 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 PREFACE
Salient changes made over previous TS -10
S No. Ref Clause of Brief Description
Rev. 11

1 2.9.2.4 (iv) Liquefaction related in soil report

2 3.5.1 Provision of pre-cast cable trench

3 3.6 Specification of RCC frame brick masonry wall & stone masonry wall

4 3.6.4 structural steel angle supporting barbed wire/concertina coil over boundary wall shall
be painted with epoxy paint

5 4.1, 4.2 “Sand” replaced with “fine aggregate”

6 5.0 &20.1 Excavation in hard rock as separate item

7 5.6 Dismantling and demolishing works

8 8.2.1 Restriction of volumetric mix concrete

9 9.0 Reinforcement steel grade revised to Fe 500D

10 10.1.1 CRB shall be RCC structure at both AIS and GIS substations.

11 10.2.1 Partition sheet for extension works in GIS hall

12 10.2.2 Reference of BIS standard

13 10.3.9 Plinth level raised to 750 mm above FGL.

14 10.3.24 Air pressure maintaining measures.

15 10.7.1 Provision of pre-cast firewall

16 10.9 Aluminium door windows replaced with uPVC sections

17 10.9.1 PU coating over total area of GIS hall

18 10.11.2 Roof treatment through graded concrete.

19 10.12.7 Provision of “triple layered” polyethylene water storage tank

20 11.3.2 Min. value of Zn-Al coating in roof and wall sheeting changed to 150 gm/sqm

21 13.22 Provision of Seamless galvalume rolling shutter

22 20.12.2 & Payment of miscellaneous structural steel for GIS equipment in GIS hall

20.12.3

Technical Specification, Section: Civil Works Page 5 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 SECTION: CIVIL WORKS

1.0 GENERAL

1.1 All civil works shall be carried out as per design/drawings provided by the Employer/
Contractor and as per these specification provided by the Employer. In case
design/drawings are prepared by the contractor then these shall be approved by the
employer before execution. In case any item is not covered under specification then the
same shall be carried out as per CPWD specification /applicable BIS Standards and Codes.
Any item for which specification is not provided herein and is not covered under CPWD
specification/ BIS Standards, the same shall be executed as per manufacturer guidelines
with the approval of employer. All materials shall be of best quality conforming to relevant
Indian Standards and Codes. In case of any conflict between Standards/ Code and
Technical Specification, the order of precedence shall be as under:
1.1.1 Technical specification,
1.1.2 BIS codes
1.1.3 CPWD specification.
The decision of engineer in charge in this regard shall be final and binding.
1.2 Wherever reference to CPWD/BIS Codes is made, it shall be to the latest edition/revision
of the same, issued up to 7 days prior to the date of opening of this tender.

1.3 The Contractor shall arrange all labour, tools, equipment, materials, temporary works,
constructional plant & machinery, fuel supply, transportation and all other incidental items
not shown or specified but as may be required for complete performance of the Works in
accordance with drawings, specifications and direction of Employer.

1.4 All materials including cement, reinforcement steel, structural steel etc. shall be arranged
by the Contractor.

1.5 The Contractor shall execute the work as per the Field Quality Plan (FQP) which is available
on POWERGRID website. All testing required shall be arranged by the Contractor at his
own cost.

1.6 The bidder shall fully apprise himself of the prevailing conditions at the proposed site,
Climatic conditions including monsoon patterns, local conditions and site specific
parameters, soil parameters, availability of construction material and shall include for all
such conditions and contingent measures in the bid, including those which may not have
been specifically brought out in the specifications.

1.7 Unless leveling is in the scope of the bidder, fairly leveled site with single level/terraces
with different levels/ gradual slope shall be handed over to the Contractor, in a phased

Technical Specification, Section: Civil Works Page 6 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 manner. The finished ground level (FGL) with a tolerance of (+/-) 100mm shall be decided
by the Employer. The layout and levels of all structure etc shall be made by the Contractor
at his own cost from the general grids of the plot and benchmarks set by the Contractor
and approved by the Employer. The Contractor shall provide all assistance in instruments,
materials and personnel to the Employer for checking the detailed layout and shall be
solely responsible for the correctness of the layout and levels.
In case leveling is in the scope of bidder, FGL shall be decided by the employer.

1.8 Employer has standardized its technical specification for various items/ works.
Specification for items which are covered in the scope and as defined in Section project &
BPS shall only be referred.

1.9 The material specification, workmanship and acceptance criteria shall be as per approved
standard Field Quality Plan. In case certain item is not covered in FQP, it shall be
constructed as per CPWD specification/ relevant BIS.

2.0 GEOTECHNICAL INVESTIGATION:

The Contractor shall perform a detailed soil investigation to arrive at sufficiently

accurate conclusion regarding general as well as specific information about the soil
profile and the necessary soil parameters of the site, in order to design and construct the
foundation of the various structures safely and rationally.
A report to the effect shall be submitted by the Contractor for Employer’s specific
approval giving details regarding data proposed to be utilized for the design.

2.1 SCOPE:

This specification covers all the work required for detailed soil investigation and
preparation of a detailed report. The work shall include mobilization of necessary
equipment, providing necessary engineering supervision and technical personnel, skilled
and unskilled labour etc. as required to carry out field investigation as well as,
laboratory investigation, analysis and interpretation of data and results, preparation of
detailed Geo-technical report including specific recommendations for the type of
foundations and the allowable safe bearing capacity for different sizes of foundations at
different founding strata starting from 0.5M from existing ground level for the various
structures of the substation. The Contractor shall make his own arrangement for
locating the co-ordinates and various test positions in field as per the information
supplied to him and also for determining the reduced level of these locations with
respect to the benchmark indicated by the Employer.

2.2 BORE HOLES:

Technical Specification, Section: Civil Works Page 7 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
  Bore holes of 150 mm diameter in accordance with the provisions of IS: 1892 at the
rate of minimum one number bore hole per hectare up to 15meter depth into virgin soil
or to refusal whichever occurs earlier shall be drilled. Total area of substation plot
(including of Switchyard, Township and Future area) shall be considered for arriving at
number of bore holes to be drilled. In any case number of boreholes shall not be less
than five and shall not exceed twenty. By refusal it shall mean that a standard penetration
blow count (N) of 100 is recorded for 30 cm penetration. In case rock is encountered
within five meter from existing ground level, coring in all the boreholes shall be carried out
up to 3 meter in rock.
 The Contractor shall carry out Standard Penetration Tests at approximately 1.5 m interval
in the borehole starting from 0 .5 m below ground level onwards and at every change
of stratum. The disturbed samples from the standard penetrometer shall also be
collected for necessary tests.
 The Contractor shall collect undisturbed samples of 100/75 mm diameter 450 mm long
from the bore holes at intervals of 2.5 m and every change of stratum starting from 0.5 m
below ground level onwards in clayey strata.
 The depth of Water Table, if encountered, shall be recorded in each borehole. In case the
soil investigation is carried out in winter/summer, the water table for rainy season shall
be collected from reliable sources and recorded in the report.
 All samples, both disturbed and undisturbed, shall be identified properly with the
borehole number and depth from which they have been taken.
 The sample shall be sealed at both ends of the sampling tubes with wax immediately after
the sampling and shall be packed properly and transported to the laboratory without
any damage or loss.
 The logging of the boreholes shall be compiled immediately after the boring is
completed and a copy of the bore log shall be handed over to the Engineer-in-charge.

2.3 TRIAL PITS:

Trial pits shall be carried out at minimum one location per hectare as directed by the
Employer. In case hard rock is encountered in trial pit, test need not be carried out. Total
area of substation plot (including of Switchyard, Township and Future area) shall be
considered for arriving at number of Trial Pit to be excavated. Minimum number of trial
pits shall be five and maximum number shall be ten. The trial pits shall be 2 m x 2 m in size
extending to 4 m depths, or as specified by the Employer. Undisturbed samples shall be
taken from the trial pits as per the direction of the Employer.

2.4 ELECTRICAL RESISTIVITY TEST :

The resistivity of earth varies over a wide range depending on its moisture content,
temperature, salt content and compactness. Therefore earth resistivity test shall be
conducted preferably during the dry season in order to get conservative results.

2.4.1 TEST LOCATION

Technical Specification, Section: Civil Works Page 8 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 In the evaluation of earth resistivity for the substations, at least eight test directions shall
be chosen from the centre of the substation to cover the entire area including the future
area. The number of test points shall be as per approved drawing.

2.4.2 PRINCIPLE OF TEST

Wenner’s four electrode method shall be used. In this method, four small electrodes shall
be buried in four small holes in the earth along a straight line at equal intervals. A test
current (I) by earth resistivity tester shall be passed between two outer electrodes and the
voltage difference (V) between the two inner electrodes shall be measured. The test
current (I) thus flowing into the earth, produces an electric field proportional to its density
and to the resistivity of the soil. The voltage (V) measured between the inner electrodes is
proportional to the field. Consequently, the resistivity will be proportional to the ratio of
the voltage to current. Thus the resistivity shall be calculated from the following equation.
4aR
a =
1+ 2a - a
2 2
(a +4b ) (a2+b2)
Where,
a is the apparent resistivity of the soil in -m
R is the measured resistance in 
a is the distance between adjacent electrodes in metres
b is the depth of the electrodes in m

2.4.3 TEST PROCEDURE

In the selected test point and chosen direction, four electrodes with insulated connecting
wires shall be driven into the earth along a straight line of equal intervals (a). The depth of
the electrodes in the earth shall be of the order of 15 cm to 20 cm. The megger shall be
placed on a steady and approximately level base, the link between terminals P1 and C1
shall be opened and the four electrodes connected to the instrument terminals. An
appropriate range on the instrument shall be selected to obtain clear readings avoiding the
two ends of the scale as far as possible.
Resistivity shall be calculated by substituting the value of R in the above equation. The test
shall be repeated in a chosen direction with a number of different electrode spacing,
increasing from 2m to 50m preferably in the steps of 2, 5, 10, 15, 25 and 50m. When the
spacing is increased gradually from low values, at a stage, it may be found that the
resistivity reading is more or less constant irrespective of the increase in the electrode
spacing. The resistivity for this spacing is noted and taken as the resistivity for that
direction. In a similar manner, resistivity for at least eight equally spaced directions from
the centre of the test points shall be measured. These measurements shall be repeated for
all test points.
Technical Specification, Section: Civil Works Page 9 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 NOTES:-
i. Soil resistivity points shall preferably be one number in each 100mx100m grid and
number of test points shall be such that the entire substation including the future area
is covered.
ii. Average resistivity value of all eight directions shall be considered for design of
earthing system.
iii. Soil resistivity measurement may be done in dry season. Small amount of water may
be applied at electrodes for making proper contact between the electrodes and soil.

2.5 PLATE LOAD TEST

Plate load test shall be conducted to determine the bearing capacity, modulus of sub grade
reaction and load/settlement characteristics of soil at shallow depths by loading a plane
and level steel plate kept at the desired depth and measuring the settlement under
different loads, until a desired settlement takes place or failure occurs. The specification
for the equipment and accessories required for conducting the test, the test procedure,
field observations and reporting of results shall conform to IS: 1888. Modulus of sub grade
reaction shall be conducted as per IS: 9214. Plate load test shall be conducted at two
locations to be decided during detailed engineering at the proposed foundation depth
below finished ground level for determining the bearing capacity.

Undisturbed tube samples shall be collected at 0.5 m and 2.5m depths from natural
ground level for carrying out laboratory tests

The size of the pit in plate load test shall not be less than five times the plate size and
shall be taken up to the specified depth. All provisions regarding excavation and visual
examination of pit shall apply here.

Unless otherwise specified the reaction method of loading shall be adopted. Settlement
shall be recorded from dial gauges placed at four diametrically opposite ends of the test
plate.

The load shall be increased in stages. Under each loading stage, record of Time v/s
Settlement shall be kept as specified in IS: 1888.

Backfilling of the pit shall be carried out as per the directions of the Employer. Unless
otherwise specified the excavated soil shall be used for this purpose. In cases of
gravel-boulder or rocky strata, respective relevant codes shall be followed for tests.

2.6 WATER SAMPLE

Technical Specification, Section: Civil Works Page 10 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 Representative samples of ground water shall be taken when ground water is first
encountered before the addition of water to aid drilling of boreholes. The samples shall be
of sufficient quantity for chemical analysis to be carried out and shall be stored in air- tight
containers.

2.7 BACK FILLING OF BORE HOLES

On completion of each hole, the Contractor shall backfill all bore holes as directed by
the Employer. The backfill material can be the excavated material.

2.8 LABORATORY TEST

2.8.1. The laboratory tests shall be carried out progressively during the field work after
sufficient number of samples has reached the laboratory in order that the test results
of the initial bore holes can be made use of in planning the later stages of the field
investigation and quantum of laboratory tests.

2.8.2. All samples brought from field, whether disturbed or undisturbed shall be
extracted/prepared and examined by competent technical personnel, and the test shall
be carried out as per the procedures laid down in the relevant I.S. Codes.

The following laboratory tests shall be carried out

i) Visual and Engineering Classification
ii) Liquid limit, plastic limit and shrinkage limit for C-Ø soils.
iii) Natural moisture content, bulk density and specific gravity.
iv) Grain size distribution.
v) Swell pressure and free swell index determination.
vi) California bearing ratio.
vii) Consolidated drained test with pore pressure measurement.
viii) Chemical tests on soil and water to determine the carbonates, sulphates, nitrates,
chlorides, Ph value, and organic matter and any other chemical harmful to the
concrete foundation.
ix) In case of rock samples following tests shall also be conducted:
• Rock quality designation (RQD), RMR.
• UCC test.
• Point load index test.
2.9 TEST RESULTS AND REPORTS

2.9.1 The Contractor shall submit the detailed report in four (4) copies wherein information
regarding the geological detail of the site, summarised observations and test data, bore
logs, and conclusions and recommendations on the type of foundations with
supporting calculations for the recommendations. Initially the Contractor shall submit

Technical Specification, Section: Civil Works Page 11 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 draft report and after the draft report is approved, the final report in four (4) copies
shall be submitted. The site test data shall bear the si gn atur es of the Investigation
Agency, Vendor and also site representative of Employer.

2.9.2 The report shall include, but not limited to the following:-

2.9.2.1 A plan showing the locations of the exploration work i.e. bore holes, trial pits, Plate load
test etc.

2.9.2.2 Bore Logs: Bore logs of each bore holes clearly identifying the stratification and the type
of soil stratum with depth. The values of Standard Penetration Test (SPT) at the depths
where the tests were conducted on the samples collected at various depths shall be
clearly shown against that particular stratum.

2.9.2.3 Test results of field and laboratory tests shall be summarized strata wise as well a s in
combined tabular form. All relevant graphs, charts tables, diagrams and photographs, if
any, shall be submitted along with report. Sample illustrative reference calculations for
settlement, bearing capacity, pile capacity shall be enclosed.

2.9.2.4 The report should contain specific recommendations for the type of foundation for the
various structures envisaged at site. The Contractor shall acquaint himself about the
type of structures and their functions from the Employer. The observations and
recommendations shall include but not limited to the following:

i) Geological formation of the area, past observations or historical data, if

available, for the area and for the structures in the nearby area, fluctuations of
water table etc.
ii) Recommended type of foundations for various structures. If piles are recommended
the type, size and capacity of pile and groups of piles shall be given after
comparing different types and sizes of piles and pile groups.
iii) Allowable bearing pressure on the soil at various depths for different sizes of the
foundations based on shear strength and settlement characteristics of soil with
supporting calculations. Minimum factor of safety for calculating net safe bearing
capacity shall be taken as 2.5.
iv) Recommendation regarding liquefaction potential/characteristics of soil during
ground shaking and possible remedies shall be provided.
v) Recommendations regarding slope of excavations and dewatering schemes, if
required.
vi) Comments on the Chemical nature of soil and ground water with due regard to
deleterious effects of the same on concrete and steel and recommendations for
protective measures.
vii) If expansive soil is met with, recommendations on removal or detainment of the

Technical Specification, Section: Civil Works Page 12 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 same under the structure, road, d r a i n s , etc. shall be given. In the latter case
detailed specification of any special treatment required including specification or
materials to be used, construction method, equipments to be deployed etc. shall
be furnished. Illustrative diagram of a symbolic foundation showing details shall be
furnished.
viii) Recommendations for additional investigations beyond the scope of the present work,
if considered such investigation as necessary.
ix) In case of foundation in rocky strata, type of foundation and recommendation
regarding rock anchoring etc. should also be given based on RMR value
2.9.2.5 All Geotechnical investigation reports must be signed and stamped by qualified
Geotechnical engineer/ consultant even if they have been prepared by NABL accredited test
labs.

3.0 STANDARD DRAWINGS:

i) Standard drawings have been developed for Control Room Building, Switchyard Panel
Room, Fire Fighting Pump House & Water Tank, Towers & Equipments Foundations,
Transit Camp, Septic Tank & Soak Pit, Roads, Road Culverts & Rail Cum Road, Drains, Chain
Link Fence & Switchyard Gate, Rain Water Harvesting by the Employer and are enclosed
with the tender documents.
ii) These drawings are good for construction and are also available on POWERGRID website.
Additional prints if any required, can be downloaded from the website.
iii) All tender drawings shall be read in conjunction with this specification. Discrepancy if any
shall be brought to the notice of Employer prior to quote.
iv) All foundation drawings including foundations for buildings, towers, equipments etc shall
be released to the Contractor after award in a phased manner, after receiving the
geotechnical investigation report.
v) Drawings for transformer, reactor foundations and fire walls are not enclosed and shall be
made available to the successful bidders by the Employer during detailed engineering.
vi) In case the site conditions warrant any special type of foundations to be used, the same
shall be designed and issued by the Employer to the Contractor during detailed
engineering unless otherwise mentioned in section project.
vii) Drawings for any non-standard tower or equipment and their foundation, if required, shall
be designed by the Employer and made available to the Contractor during detailed
Engineering unless otherwise mentioned in section project.
viii) Drawings that have been mentioned and to be issued by the Employer to the Contractor
during detailed Engineering shall be made available to the Contractor as per the agreed
work schedule finalized after award.
ix) Items/ components of buildings not explicitly covered in the specification but required for
completion of the project shall be deemed to be included in the scope.

Technical Specification, Section: Civil Works Page 13 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
3.1 ROADS, ROAD CULVERTS AND RAIL CUM ROAD:

3.1.1 The construction drawings showing section detail for road, culverts as well as rail cum road
are enclosed with the tender documents. The layout of roads shall be as per approved
general arrangement drawing. Types of the roads in the scope of contract shall be either of
RCC or bituminous road as indicated in the GA drawing or in Bid Price Schedule.

3.1.2 The width of the road shall be either 5.5m wide or 3.75m as indicated in the GA drawing.
Type of pavement either rigid pavement (RCC Road) or flexible pavement(Bituminous
Road) shall be as per tender documents.

3.1.3 The type & location of culverts i.e. the number and diameter of Hume pipes shall be as
decided during detailed engineering. The invert level of Hume pipes of culverts shall match
with the invert level of drain meeting the culvert.

3.1.4 100mm diameter RCC Hume pipe (NP-3) shall be provided across the road at every 100M
interval along the road. In case NP3 pipe is not available, vendor may provide 100 dia
UPVC pipe encased with 75 mm thk. concrete 1:2:4 alround without any financial
implication to POWERGRID.

3.1.5 Road within the switchyard area should have shoulder of 600mm wide on either sides of
road. Shoulder shall be smooth finished with well compacted 75mm thick PCC 1:4:8. The
road leading to control room building and the roads outside switchyard fence area shall be
provided with kerb stone and interlocking tiles on shoulder. Width of shoulder shall be
1.75m in case of 5.5m wide road and 1.3m in case of 3.75m wide road.

3.1.6 The shoulder of the road in case of substation extension shall match with the shoulder of
the existing road in all respect.

3.1.7 Road leading towards the area of Autotransformer/Reactor shall be as short as possible.
Road layouts shall be prepared with adequate turning radius, so that easy movement of
vehicles is possible. Roads which are to be used for carrying transformers / reactors shall
be provided with turning radius preferably 19.5M or more but not less than 16.5M.
Turning radius of other roads may be decided at site depending on layout constraints

3.1.8 Contractor may use WMM instead of WBM with prior approval of employer without any
additional financial implication to POWERGRID. Guidelines of IRC: 109-1997 shall be
followed for Wet Mix Macadam (WMM) only. However, measurement of road shall be
done as specified elsewhere in this specification.

3.1.9 In case of rigid pavements, RCC shall be laid and finished with screed board, vibration,
vacuum dewatering process etc.

Technical Specification, Section: Civil Works Page 14 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
3.2 DRAINS:

3.2.1 The construction drawing for the section of drain is enclosed with the tender documents.

3.2.2 The Contractor shall propose an overall drainage layout for the new sub-station or
extension of substation during detailed engineering considering the site conditions which
is to be approved by POWERGRID before execution. The type of drains used shall be of the
sections standardized and indicated in the drawings enclosed with the tender documents.

3.3 CHAIN LINK FENCING AND SWITCHYARD GATE:

3.3.1 Fencing and Gate shall be constructed as per drawing attached with tender documents
and are also available on POWERGRID website.

3.3.2 Fencing and Gate shall be provided at the locations shown in approved general
arrangement drawing. Separate gate shall be provided for men and equipment. Fence shall
also be provided for the various equipments (if) mounted on ground or a height lower than
2.5m. Necessary gates shall be provided for each area so surrounded.

3.3.3 Chain link of galvanized fence fabric with 3.15mm dia wire and 75mm mesh size
conforming to IS: 2721 shall be used. MS tube used shall be of grade YST210 and conform
to IS: 1161. All other structural steel shall conform to IS: 2062.

3.3.4 The whole assembly of tubular post and frame of panels shall be hot dip galvanized. The
zinc coating shall be minimum 610 gram per square meter. In case the substation is
located within 30km from sea coast, the zinc coating shall be 900gm per square meter. The
purity of zinc shall be 99.95% as per IS: 209.

3.3.5 The gate shall be made of medium duty M.S. pipe of grade YST210 and conform to IS: 1161
with welded joints. The main frame (outer frame) of the gate shall be made of 40mm
nominal bore pipe and vertical pipes of 15mm nominal bore @ 125mm spacing (maximum)
shall be welded with the main frame. Gate shall be painted with one coat of approved
steel primmer and two or more coats of synthetic enamel paint to give an even shade.

3.4 RAIN WATER HARVESTING:

3.4.1 In addition to drainage of rainwater, the Contractor shall make arrangement for rainwater
harvesting also. A drawing showing details of recharge structure for rainwater harvesting is
enclosed with tender document and is also available on POWERGRID website.

Technical Specification, Section: Civil Works Page 15 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
3.4.2 Rainwater harvesting shall be done by providing recharge structures with bore wells. The
contractor shall propose location of recharge structures within the sub-station considering
the site conditions which is to be approved by POWERGRID before execution. Branch drains
from the main drain carrying rainwater from entire switchyard shall be connected to the
recharge structures.

3.5 CABLE TRENCHES:

3.5.1 The construction drawings of cable trenches, cable trench crossing road and sump are
enclosed with tender documents. The construction of cable trenches shall be cast in situ
type or pre cast RCC as per drawings and meeting the technical specification. The
Contractor shall propose an overall cable trench layout for the substation during detailed
engineering which is to be approved by POWERGRID before execution.

3.5.2 The layout should show type of cable trench, longitudinal slope and invert level calculated
considering future extensions also. The types of cable trench shall be of the section
indicated in the drawings enclosed with the tender documents and are also available on
POWERGRID website.

3.6 BOUNDARY WALL

Boundary wall shall be brick masonry wall with RCC frame or Stone masonry wall or Pre
cast RCC wall. The construction drawing of the boundary wall applicable is enclosed with
tender document. All walls shall have adequate weep holes/ gratings as per drawing/ as
per site conditions for the drainage of water. The layout shall be as per approved layout
drawing during detail engineering.
3.6.1 Brick masonry wall with RCC frame:

Boundary wall shall consist of frame of RCC column and foundation at regular intervals
connected through plinth beam and supporting 230 thick brick masonry. Details such as
height, column spacing, structural details, fencing/grating works, plastering/ painting, etc.
shall be as per tender/construction drawing.
3.6.2 Stone masonry wall:

Boundary wall shall be Random Rubble masonry wall and coursed rubble masonry (for
front portion). The wall thickness shall be 350 thk and foundation, height, fencing shall be
as per tender/construction drawing.

3.6.3 Pre cast boundary wall:

3.6.3.1 Pre-cast reinforced concrete units such as columns, posts, wall panels etc. shall be of grade
M-25 Design Mix. Mix design concrete should be well proportioned, mixed, placed and
thoroughly compacted by mechanical/platform/form vibrators to give a dense concrete
free from voids and honey combing. Fly ash conforming to grade-I of IS: 3812 (Part-1) may
be used as part replacement of OPC as per IS: 456. Uniform blending with cement to be
Technical Specification, Section: Civil Works Page 16 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 ensured in accordance with clauses 5.2 and 5.2.1 of IS: 456 -2000. Admixtures may be used
with the approval of the engineer-in-charge. However use of any admixture containing
chlorides in any form is prohibited. No admixtures shall be accepted for use in concrete
unless these are tested in accordance with IS: 9103 and the test results are approved by
the Engineer-in-Charge.

3.6.3.2 The forms/ moulds shall be of fiber glass or of steel sections for better finish. Provision
shall be made in the forms and moulds to accommodate fixing devices such as angle for
concertina coils, hooks and forming of notches and holes.

3.6.3.3 The contractor may pre-cast the units on cement or steel platform which shall be
adequately oiled provided the surface finish is of the same standard as obtained in form.
Each unit shall be cast in one operation.

3.6.3.4 Pre-cast articles shall have a dense surface finish showing no coarse aggregate and shall
not have cracks or crevices likely to assist in disintegration of concrete or rusting of steel
or other defects that would interfere with the proper placing of the units. All angles of the
pre-cast units with the exception of the angles resulting from the splayed or chamfered
faces shall be true right angles. Arises shall be clean and sharp except those specified or
shown to be rounded. Gaps if any noticed during installation shall be finished with
1:3cement Mortar. The wearing surface shall be true to the lines. On being fractured, the
interior of the units should present a clean homogeneous appearance.

3.6.3.5 The pre-cast articles shall be matured for 28 days before erection or being built in so that
the concrete shall have sufficient strength to prevent damage to units when first handled.
Date of casting shall be marked on the surface which should not be visible after
installation.

3.6.3.6 The exposed surfaces of walls & columns shall be painted with water proofing cement
paint of approved shade to give an even shade as per BOQ item.

3.6.3.7 Reinforcement as per approved design drawing shall be placed inside the mould in such a
way as to fulfill the minimum cover requirement or as per the drawing. Concrete shall
then be poured in middle and the sides and compacted with a plate vibrator
(platform/table/surface vibrator).

3.6.3.8 Each Pre-cast unit shall have marking like; date of manufacturing and identification
number. Units without marking shall not be accepted.

3.6.3.9 The mould sizes shall satisfy the following dimensional tolerances:

S.No. DIMENSION TOLERANCE

1 Length ±4 mm

2 Width ±2 mm

Technical Specification, Section: Civil Works Page 17 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 3 Depth ±2 mm

3.6.3.10 Contractor shall make his own arrangement for curing by making suitable size pond for
curing as directed by Engineer-in-charge. After having been cast in the mould or form the
concrete shall be adequately protected during setting in the first stages of hardening
from shocks and from harmful effects of frost, sunshine, drying winds and cold. The
concrete shall be cured at least for 7 days from the date of placing of concrete in case of
OPC and at least 10 days where mineral admixtures or blended cements are used. In hot
& arid regions, the minimum curing period shall be 14 days.

OR

Pre-cast units shall be stacked against a vertical support in nearly vertical position and
cured for at least two weeks by sprinkling water. If necessary, low pressure steam curing
may be employed. It shall further be air cured for another two weeks before it can be used
for construction. During initial stages of hardening, the Pre-cast units shall be adequately
protected from shocks as well as harmful effects of frost, sunshine, drying winds and cold.

3.6.3.11 SAMPLING

 All Pre-cast units (viz. planks and columns) of the same size, manufactured from similar
materials and under similar conditions of production shall be grouped together to
constitute a lot.
 Five units shall be selected at random out of a lot consisting of 300 units or less. For lots
bigger than 300 units, 5 units shall be selected for every additional 300 units or part
thereof.
 The units shall be selected from the lot at random. In order to ensure randomness of
selection, procedure given in IS: 4905-1968 may be followed. The sampling procedure may
be modified, if the Engineer-In-Charge desires so.

3.6.3.13 DIMENSIONAL TOLERANCES

Pre-cast units manufactured in accordance with the drawings/specifications shall be

required to satisfy following dimensional tolerances:

S.No. DIMENSION TOLERANCE

1 Length ±5 mm

2 Width ±3 mm

3 Thickness ±2 mm

4 Bow (Deviation from intended line or plane) ±2 mm

Technical Specification, Section: Civil Works Page 18 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 5 Twist (Distance of any corner from the plane containing 1 mm
other three corners)

If four out of the five samples satisfy the shape (as per the drawing) and dimensional
requirements as tabulated above, the lot represented by the sample shall be deemed to
have passed the dimensional requirements.

3.6.3.14 HANDLING, STORAGE AND DELIVERY

 Pre-cast units shall be stored, transported and placed in position in such as manner that
they will not be overstressed or damaged.
 Pre-cast units shall be transported to the site by suitable means as approved by the
Engineer-In-Charge. Care shall be taken to ensure that no damage occurs during
transportation.
 In case the units are to be transported in trolleys, the overhang of the units from the
trolley shall not be more than one-fifth of length of the Pre-cast unit.
 For lifting/handling the units, rope slings shall be used at locations where lifting hooks have
been provided. The units shall be lifted manually or with the help of chain pulley blocks or
mechanically with a hoist or a crane. The Pre-cast units shall be handled and transported in
nearly vertical position as far as possible and these should be supported only near the
edges.
 Any defect/breakage arising during transportation, due to mishandling or due to faulty
storage practice shall be the sole responsibility of the Manufacturer/Supplier/Agency.

3.6.3.15 ERECTION

 Precast concrete columns and wall panel shall be placed in truly vertical position with the
aid of a compatible light crane/manually/by suitable means.
 For erection, panels are handled by means of lifting devices/manually to set into columns
wedge. Panels may be carefully placed in successive horizontal position by means of
temporary wooden wedges placed at the junction of the two adjacent panels during
construction and which shall be removed after proper placement of panels.
 After placement of wall panels, gaps if any between the wall panels shall be filled with 1:3
cement mortar and shall b finished before taking up of painting. No extra payment shall be
made for filling of joints with cement mortar.
 Pre-cast units shall be erected in such a manner that no part is overstressed or damaged
due to faulty erection.
 Any defect/breakage occurred during erection shall be the sole responsibility of the
Agency/Manufacturer/Supplier and such units shall not be accepted for use in
construction.

3.6.3.16 MISCELLANEOUS

The work to be performed under this specification shall include providing all labour,
supervision, materials, storages, inventories, all enabling works like scaffolding, watch and
ward for the works, power, fuel, construction equipment, water, tools and plants,
transportation, all taxes and duties, all labour welfare and safety measures, complete and
Technical Specification, Section: Civil Works Page 19 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 all other incidental items not shown or specified, but reasonably implied or necessary for
successful completion of the work including Contractor’s supervision and in strict
accordance with the drawings and specifications, inspection and testing standards and
field quality control and testing as given in the tender documents and the complete
execution of the works.

Any technical clarifications required regarding the drawings/specifications during the

progress of works shall be obtained from the Engineer-in-Charge.

Employer reserves the right to inspect all the material before dispatch.

3.6.4 All structural steel angle for supporting barbed wire/concertina coil shall be painted with
epoxy paint of approved brand and colour shade.

4.0 STONE SPREADING AND ANTI-WEED TREATMENT

4.1 The layout of the area, where anti-weed treatment and stone spreading is to be done,
shall be developed by the Contractor during detailed engineering and the same shall be
submitted to the employer for approval. The Contractor shall arrange all labour,
equipment and materials required for complete performance of the work in accordance
with the drawings, specification and direction of the Employer.

4.2 Stone spreading over cement concrete layer shall be done in the areas of the switchyard
under present scope of work. The cement concrete layer shall also be provided in future
areas within the fenced area. However the stone spreading in future areas shall be
provided in case step potential without stone layer is not well within safe limits.

4.3 The material required for site surfacing/stone filling shall be free from all types of organic
materials and shall be of standard quality, and as approved by the Employer.

4.4 The material to be used for stone filling/site surfacing shall be stone aggregate of 40mm
nominal size (ungraded single size) conforming to Table 2 of IS:383 – 1970. Hardness,
flakiness shall be as required for wearing courses are given below:
i) Sieve Analysis limits (Gradation) (IS : 383 – Table – 2)
Sieve Size % passing by weight
63mm 100
40mm 85-100
20mm 0-20
10mm 0-5
ii) Hardness : Abrasion value (IS:2386 Part-IV) – not more than 40% Impact value (IS:
2386 Part-IV) – not more than 30%.

iii) Flakiness Index : As per IS: 2386 Part – I maximum value is 25%.

Technical Specification, Section: Civil Works Page 20 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 iv) Frequency of test shall be conducted for sieve analysis, Hardness & Flakiness index
as per latest SFQP available on POWERGRID website.

4.5 After all the structures/equipments are erected, antiweed treatment shall be applied in
the switchyard where ever cement concrete is to be done and the area shall be thoroughly
de-weeded including removal of roots. The recommendation of local agriculture or
horticulture department may be sought where ever feasible while choosing the type of
chemical to be used.

4.6 The antiweed chemical shall be procured from reputed manufacturers. The doses and
application of chemical shall be strictly done as per manufacturer’s recommendation.
Nevertheless the effectiveness of the chemical shall be demonstrated by the Contractor in
a test area of 10MX10M (appx) and shall be sprinkled with water at least once in the
afternoon every day after forty eight hours of application of chemical. The treated area
shall be monitored over a period of two to three weeks for any growth of weeds by the
Engineer – in- charge. The final approval shall be given by Engineer – in –charge based on
the results.

4.7 Engineer-in-charge shall decide final formation level so as to ensure that the site appears
uniform devoid of undulations. The final formation level shall however be very close to
the formation level indicated in the approved drawing.

4.8 After antiweed treatment is complete, the surface of the switchyard area shall be
maintained, rolled/compacted to the lines and grades as decided by Engineer-in-charge.
The sub grade shall be consolidated by using half ton roller/surface vibrator with suitable
water sprinkling arrangement to form a smooth and compact surface. The roller shall run
over the sub grade till the soil is evenly and densely consolidated and behaves as an elastic
mass.
4.9 In areas that are considered by the Engineer-in-Charge to be too congested with
foundations and structures for proper rolling of the site surfacing material by normal
rolling equipments, the material shall be compacted by hand rammer, if necessary. Due
care shall be exercised so as not to damage any foundation structures or equipment during
rolling / compaction.

4.10 The sub grade shall be in moist condition at the time the cement concrete is placed. If
necessary, it should be saturated with water for not less than 6 hours but not exceeding 20
hours before placing of cement concrete. If it becomes dry prior to the actual placing of
cement concrete, it shall be sprinkled with water and it shall be ensured that no pools of
water or soft patches are formed on the surface.

4.11 Over the prepared sub grade, 75mm thick base layer of cement concrete in 1:5:10 (1
cement: 5 fine aggregate: 10 burnt brick aggregate 40mm nominal size) shall be provided

Technical Specification, Section: Civil Works Page 21 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 in the area excluding roads, drains, cable trenches as per detailed engineering drawing.
The Contractor shall have option to use graded stone aggregate 40mm nominal size in
place of brick aggregate without any extra cost to employer. For easy drainage of water,
the slope of 1:1000 is to be provided from the ridge to the nearest drain.

4.12 The ridge shall be suitably located at the centre of the area between the nearest drains.
The above slope shall be provided at the top of base layer of cement concrete in 1:5:10. A
layer of cement slurry of mix 1:6 (1cement: 6 fine aggregate) shall be laid uniformly over
cement concrete layer. The cement consumption for cement slurry shall not be less than
150 kg for every 100 sq.m.

4.13 A final layer of 100mm thickness of stone aggregate of 40mm nominal size (conforming to
clause 5.2.1) shall be spread uniformly over cement concrete layer after curing is
complete.

5.0 EXCAVATION AND BACKFILL OF FOUNDATIONS:

Excavation for foundations shall be in accordance with CPWD Specification/ the relevant
BIS code. Excavation shall include removal of all materials of whatever nature at all depth
and whether wet or dry necessary for the construction of foundations. The bottom of
excavation shall be leveled both longitudinally and transversely unless otherwise
mentioned in the drawings or as directed by Engineer-in-charge. Excavation shall be
measured as classified under:-
a) Excavation in all kind of soil including soft/ disintegrated rock, PCC, WBM, Brickwork/
stone masonry etc (excluding hard rock).

b) Excavation in hard rock (required blasting)

5.1 If required the sides of excavations should be supported in such a way as is necessary to
secure these from falling in, and the shoring, if required, shall be provided and maintained
in position as long as necessary. No extra payment shall be made for shoring.

5.2 Whenever water table is met during the excavation, it shall be dewatered and water table
shall be maintained below the bottom of the excavation level during excavation, The
excavation shall be kept free from water:-
 When concrete and/or masonry works are in progress and till they come above the
natural water level
 Till the Employer considers that the concrete/ mortar is sufficiently set.

No extra payment shall be made for dewatering.

5.3 Material unsuitable for foundations shall be removed and replaced by suitable fill material
as per specification and to be approved by the Employer.
Technical Specification, Section: Civil Works Page 22 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
5.4 Backfill material around foundations or other works shall be suitable for the purpose for
which it is used and compacted. Requirements regarding density / tests of backfilled earth
shall be as specified in Field Quality Plan. The sub-grade for the roads and embankment
filling shall be compacted to minimum 95% of the Standard Proctor’s density at OMC
(optimum moisture content). Cohesion less material sub-grade shall be compacted to 70%
relative density (minimum).

5.5 If, excavated material is not suitable or not required for backfill, it shall be disposed off in
areas as directed by Employer up to a maximum lead of 2 km from the substation
boundary.

5.6 DISMANTLING & DEMOLISHING WORKS

a. The scope of work includes dismantling of existing R.C.C. works at all levels (in
foundations or super structures) either manually or by mechanical means including
disposal of steel bars and unserviceable material as per direction of Engineer – in-
charge. The work of dismantling of RCC works shall be measured in cu. m. Dismantling
work must be carried out very carefully under strict close supervision to ensure
structural stability of the remaining and/or adjoining/ abutting structure.
b. The scope of work includes Demolishing/dismantling of existing chain link fencing
either manually or by mechanical means including disposal of unserviceable material as
per direction of Engineer – in-charge. The work of dismantling/demolishing of existing
chain link fencing shall be measured in running meter.

5.7 REQUIREMENT FOR FILL MATERIAL UNDER FOUNDATION:

5.7.1 The thickness of fill material under the foundations shall be such that the maximum
pressure from the footing, transferred through the fill material and distributed onto the
original undisturbed soil will not exceed the allowable soil bearing pressure of the original
undisturbed soil.

5.7.2 The filling shall be done in accordance with clause 4.10 of IS: 1080. For expansive soils the
fill materials and other protections etc. to be used under the foundation is to be got
approved by the Employer.

5.7.3 Cohesive Non Swelling (CNS) soil, if required, for filling under / around the foundations,
cable trenches, drains, roads etc shall confirm to IS: 9451: 1994 reaffirmed 2004

6.0 CEMENT:
6.1 The type of cements which can be used are Portland Pozzolana cement (conforming to
IS:1489), Ordinary Portland cement (conforming to IS:269 or IS:8112 or IS:12269), and
Portland Slag cement. (Conforming to IS: 455). Cement shall be arranged by contractor.

Technical Specification, Section: Civil Works Page 23 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
6.2 Generally PPC type shall be used for concrete work. However depending on availability,
OPC may also be used without any additional financial implication to POWERGRID.

6.3 Extra care for curing shall be taken for concrete made with OPC 53 grade & PPC.

6.4 Extra care for removing form work shall be taken, when PPC is used.

6.5 Portland Slag Cement has low heat of hydration and is relatively better resistant to soils
and water containing excessive amount of sulphates of alkali metals, alumina and iron, as
well as to acidic waters. Hence it can be specifically allowed for above conditions with prior
approval of EIC.

7.0 CHEMICAL ADMIXTURES & ADDITIVES

7.1 Use of chemical admixtures shall be permitted in accordance, with the provisions of
IS 456 and IS 9103.

7.2 It shall be the responsibility of the producer to establish compatibility and suitability
of any admixture with the other ingredients of the mix and to determine the dosage
required to give the desired effect. The amount of admixture added to mix shall be
recorded in the production record by the producer.

7.3 Admixtures should be stored in a manner that prevents degradation of the product
and consumed within the time period indicated by the admixture supplier. Any
vessel containing an admixture in the plant or taken to site by the producer shall be
clearly marked as to its content.

7.4 When offering or delivering a mix to a purchaser it should be indicated if such a mix
contains an admixture or combination of admixtures or not. The admixtures may be
identified generically and should be declared on the delivery ticket.

8.0 REINFORCED CONCRETE CEMENT (RCC):

All RCC work including material properties, proportioning, batching, mixing, transporting,
pouring, compacting, finishing, curing, sampling, testing, acceptance criterion etc. shall be
as per IS : 456-2000 (or latest)

8.1 DESIGN MIX CONCRETE

8.1.1 For new substations and extensions except minor works, Reinforced cement concrete shall
be M-25 design mix conforming to IS: 456. IS: 10262 shall be followed for mix

Technical Specification, Section: Civil Works Page 24 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 proportioning. The minor work may be defined as any work involving less than 3.0 cum of
concrete in a single day of concreting at one particular construction site .

8.1.2 Design mix concrete may be procured from approved RMC plant as per latest IS: 4926 or
may be prepared by using a portable/mini/compact weigh batch plant conforming to latest
IS: 4925

8.1.3 As per provisions of IS: 456, fly ash conforming to grade I of IS: 3812 (part-1) may be used
as part replacement of cement, when OPC cement is used for concrete works. Uniform
blending with cement is to be ensured.

8.2 VOLUMETRIC MIX CONCRETE

8.2.1 Use of volumetric mix concrete shall be restricted to minor works only (as per clause 8.1.1)
with approval of engineer incharge. In such cases reinforced cement concrete shall be of
volumetric mix 1:1.5:3 (1 cement: 1.5 coarse sand: 3 well graded stone aggregate 20mm
nominal size) conforming to CPWD specifications. Volumetric mix 1:1.5:3 shall be
considered equivalent to M-20.

8.2.2 In case of volumetric mixes, Standard measuring boxes of 35cmX40cmX25cm (35 liters
capacity as per CPWD) shall be used for measuring fine and coarse aggregates.

8.2.3 However, full 50 kg of OPC/PPC/Slag cement shall be directly unloaded into the mixer
hopper to ensure that cement consumption is 400kg per cum of 1:1.5:3 concrete
irrespective of different types of cements with different densities.

8.2.4 The cement consumption shall be as per DSR (CPWD) for other grades of concretes
provided as volumetric concrete in the BPS.

8.2.5 For volumetric mix concretes, the cement used may be generally PPC type, however
concrete may be prepared with OPC also, without any financial implication to
POWERGRID.

9.0 REINFORCEMENT STEEL:

Reinforcement steel shall be thermo mechanically treated (TMT) or HYSD reinforcement

bars of grade Fe 500D conforming to IS: 1786. Reinforcement shall be arranged by
contractor.

Technical Specification, Section: Civil Works Page 25 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
10.0 DRAWINGS AND DESIGN TO BE DEVOLOPED BY CONTRACTOR / EMPLOYER DURING
DETAILED ENGINEERING:

The following clauses are applicable for the design and drawings which are to be
developed during detailed engineering either by contractor/ vendor or by employer as per
section project.

10.1 CONTROL ROOM BUILDING:

10.1.1 For AIS Substations: Control room building shall be of RCC framed structure & brickwork
(Conventional).
For GIS Substations: Control room building shall be of RCC framed structure with
brickwork; however its alignment shall be in line with GIS hall & may/may not be
attached to GIS hall as per detail engineering.
10.1.2 In case of extension of Control room building, the same shall be matched with existing
building, whether it is PEB or Conventional.

10.1.3 All walls shall be of non-load bearing Minimum wall thickness of full brick with 1:6
cement sand mortar. Partition walls in toilets and pantry can be half brick walls with 1:4
cement sand mortar and two nos. 6mm dia MS bars at every third course. CPWD
specifications shall be followed for brick masonry work.

10.1.4 Partitions, if any required shall be made of powder coated aluminium frame (minimum
thickness of powder coating is 50 micron) provided with minimum 5.5mm thick clear
glass or pre-laminated board depending upon the location of partition.

10.1.5 The details of doors and windows of the control room building shall be as per finish
schedule Table-1.

10.1.6 IS approved or ISI Marked PVC electrical conduits of shall be provided as per the
requirement of electrical installations including its accessories, junction boxes/surfaces
boxes, fan boxes etc. Areas where false ceiling is provided electrical conduit may be laid
on exposed surfaces of walls or ceiling, above false ceiling area. In rest areas conduits &
junction boxes, fan boxes etc. shall be concealed.

10.1.7 Contractor shall develop conduit layout drawing based on electrical illumination &
Electrical installation drawings approved by POWERGRID. For control Room conference
Hall/Admin Hall conduits are also to be provided below floor tiles for extending power
supply/internet cables to Conference table users/ Admin Cubicles.

Technical Specification, Section: Civil Works Page 26 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
10.1.8 The plinth area of Control Room Building either PEB or conventional shall be as per
respective items of BPS. The calculation of plinth area shall be as per IS:3861-2002. It
shall comprise of following, to meet the functional requirement:
 Control room, ACDB & DCDB room, Battery room, Electrical lab, Telecom Room, In-
Charge Room with attached toilet, Administrative area, Pantry, Lobby, Passage,
toilet, shafts etc.
 Portico in case of RCC Building / 3m wide canopy in case of PEB
 One toilet should be disabled friendly.

10.1.9 The area for above provisions shall be suitably decided by bidder during detailed
engineering stage in consultation with employer.

10.1.10 Control room building shall be so designed that most of the area of switchyard is visible
from control room.

10.1.11 Open cable trenches in the building shall be covered with minimum 6mm thick steel
chequered plate with suitable stiffeners. Chequered plate shall be painted with two or
more coats of epoxy paint as per item 13.52 of DSR’ 2014 over a coat of steel primer.

10.1.12 The isometric view of the CRB with local aesthetic and best industry practices shall be
submitted by vendors for approval of POWERGRID. Three alternatives of colored
isometric views with different color shades shall be submitted for approval.

10.1.13 All flooring area other than foundations shall be designed as industrial floor with
minimum 100 mm thick RCC floor slab, laid over well compacted stone soiling of
minimum 200 mm thick using stone of size 150 mm & below with interstices filled with
sand over well compacted earth.

10.2 GIS BUILDING / GIS HALL:

10.2.1 The New GIS building shall be of pre-engineered steel structure. GIS building consist of
GIS hall, Room for control, protection & communication panels and AHU room. Provision
for service bay and future extension of the building shall be made. During extension
works in GIS hall, to keep the existing part of the building dust free, a temporary partition
sheet of suitable material and strength shall be provided without any additional cost to
POWERGRID. The same shall be removed after completion of work and taken back by
contractor. Suitable space shall be provided to facilitate maintenance of GIS equipments.
Panels shall be kept in an air-conditioned enclosure. The building shall be designed for
future expansion also. Building shall be designed in such a manner that the same crane
shall be extended in future expansion. Loads, structural design, fabrication & erection,
material etc. of PEB structure shall be as per BIS standards

Technical Specification, Section: Civil Works Page 27 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
10.2.2 In case of extension of GIS building, the same shall be matched with existing type either
PEB or conventional.

10.2.3 Size of the building shall be as per requirement of GIS modules, panel, O&M needs and
housekeeping considerations. Any clearance required as per Electricity Act or any other
Standard shall also be kept. Separate fire escape doors shall also be provided in the GIS
Building

10.2.4 A Glazed partition made of aluminum extruded sections powder coated frame (min. 50
micron powder coating) and 5.5 mm (min) thick glass shall be provided between GIS hall
and panel room. The total height of glazed partition shall 3000 mm above FFL include sill
level of 900mm. Up to sill level full brick masonry wall to be provided and finished with
Non-VOC acrylic emulsion paint to give an even shade on plastered surface over 2mm
POP putty.

10.2.5 Over all Width of crane walk way shall not be less than 1.0m and shall be provided at
gantry girder level on the two longer side of GIS hall along with climbing arrangement to
facilitate maintenance of crane. Suitable arrangement shall be made on top of the crane,
to facilitate maintenance of lighting fixtures. Structural steel of walkway shall be finished
with priming coat of standard steel primmer followed by one coat of epoxy paint and
final coating of PU (Minimum 100 Micron). The minimum clear height of the building
shall be kept 1800 mm from the top of walk way or 600 mm above the top most point of
crane, whichever is higher.

10.2.6 The base plate of steel columns shall be mounted on the RCC foundation by means of hot
dip galvanized foundation bolts (The zinc coating shall be minimum 610 gram per square
meter. In case the substation is located within 30km from sea coast, the zinc coating
shall be 900gm per square meter. The purity of zinc shall be 99.95% as per IS: 209). The
RCC pedestal shall not protrude above floor level to avoid obstruction in the movement.

10.2.7 PVC electrical conduits of ISI marked or IS approved shall be provided as per the
requirement of electrical installations its accessories, junction boxes/surfaces boxes, fan
boxes etc. Areas where false ceiling is provided and on puff panels, electrical conduit may
be laid on exposed surfaces of walls or ceiling, above false ceiling area. In rest area
conduit & junction boxes, fan boxes etc. shall be concealed wherever brick wall/RCC is
provided.

10.2.8 The walls of GIS building and the attached relay room shall be of full brick and up to a
height of 150mm above false ceiling level of relay room. Rest portion shall be provided
with puff sandwiched panels as mentioned elsewhere in TS.

Technical Specification, Section: Civil Works Page 28 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
10.2.9 Open cable trenches in the GIS hall shall be covered with minimum 6mm thick steel
chequered plate with suitable stiffeners. Chequered plate shall be painted with two or
more coats of epoxy paint as per item 13.52 of DSR’ 2014 over a coat of steel primer.

10.2.10 Colour Scheme matching with local aesthetic and best industry practices shall be
submitted by vendors for approval of POWERGRID. Three alternatives of coloured
isometric views with colour codes shall be submitted for approval. The monotony of
external colour of sheet shall be avoided by providing vertical bands of different coloured
sheet. The colour of roof sheet shall be light coloured to minimize heat absorption.
External and internal masonry walls shall be painted with suitable approved colour in
consultation with Employer.

10.2.11 All external openings for duct entries shall be provided with all round sunshade/chajjas to
ensure that no rain water shall directly splashes on the sealant.
10.2.12 All flooring area other than foundations shall be designed as industrial floor with
minimum 100 mm thick RCC floor slab, laid over well compacted stone soiling of
minimum 200 mm thick using stone of size 150 mm & below with interstices filled with
sand over well compacted earth and with floor finish as per table - 1.

10.3 BUILDING DESIGN CONSIDERARIONS:

THE CONTROL ROOM BUILDING & GIS BUILDING SHALL BE DESIGNED:

10.3.1 To the requirements of the National Building Code of India, and the standards quoted
therein.
10.3.2 For the specified climatic & loading conditions.

10.3.3 To adequately suit the requirements of the equipment and apparatus contained in the
buildings and in all respects to be compatible with the intended use and occupancy.

10.3.4 With a functional and economical space arrangement.

10.3.5 To be aesthetically pleasing. Different buildings shall show a uniformity and consistency
in architectural design.

10.3.6 To allow for easy access to equipment and maintenance of the equipment.

10.3.7 With wherever required, fire retarding materials for walls, ceilings and doors, which
would prevent supporting or spreading of fire.

10.3.8 With materials preventing dust accumulation.

Technical Specification, Section: Civil Works Page 29 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
10.3.9 With the FFL of building shall be minimum 750 mm above finished ground level or as
indicated in the tender drawings. In case of extension of existing buildings, FFL should
match with the existing buildings.

10.3.10 With anti-termite treatment, plinth protection, DPC, peripheral drain, sanitary, water
supply, electrification etc.

10.3.11 With the building lighting, in accordance with the requirements of relevant section.

10.3.12 With the building auxiliary services like air conditioning and ventilation systems, fire
protection and detection systems and all other miscellaneous services, in accordance
with the requirements specified in relevant section or elsewhere in this Specification.

10.3.13 Most critical combinations of dead loads, super- imposed loads, equipment loads, crane
load, wind loads, Snow load, seismic loads, any other load etc whichever is applicable
shall be considered.

10.3.14 The individual members of the buildings frame shall be designed for the worst
combination of forces such as bending moment, axial force, shear force, torsion
deflection etc.

10.3.15 The permissible stresses for different load combinations shall be taken as per relevant
BIS Codes.

10.3.16 All structures and its components must be designed and detailed as per latest BIS
standards incorporating ductile detailing. List of reference codes e.g IS 456-2000 (latest),
IS 875 all parts, IS 1893 all parts, IS 4326, IS 13920,SP34 etc.
10.3.17 RCC columns shall be provided with rigid connection at the base.

10.3.18 The design of steel structures for the Pre-engineered buildings shall be done in
accordance with IS: 800-2007 with limit state method or elsewhere mentioned in section
project.

10.3.19 Limit state method of Concrete design shall be adopted unless specified otherwise in the
specification.

10.3.20 Clear cover to reinforcement shall be as per IS: 456 (latest).

10.3.21 Expansion joints wherever necessary with provision of twin columns shall be as per the
provisions of relevant IS or National building codes.

10.3.22 Any sub-soil water encountered at founding level, same shall be considered in the

Technical Specification, Section: Civil Works Page 30 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 design.
10.3.24 For maintaining adequate air pressure inside GIS Halls following measures need to be
adopted:

1. Elastomeric sealants to be provided at doors/windows junction with walls, duct entry

points, roof joint, etc. to check any air leakages.
2. Cable sealing system shall be provided at the cable entry points.
3. Mats to be provided on cable trenches to reduce air leakage.
4. External doors shall be inward opening.
5. Providing of an air lock lobby for separating the inside area of GIS hall.

10.4 DESIGN LOADS:

The following loads shall be considered in design, in addition to the equipment

manufacturer’s requirements if any. However, all the loads, which are required for design,
are subjected to employer’s approval.

10.4.1 DEAD LOADS

i) Dead loads shall include the self-weight of all structures complete with finishes, fixtures
and partitions.
ii) In addition, RCC beams shall be designed for any incidental point loads to be applied at any
point along the beams if applicable.

10.4.2 IMPOSED LOADS

i) Super-imposed loads in different areas shall include live loads, minor equipment loads,
cable trays, small pipe racks/hangers and erection, operation and maintenance loads
wherever these loads are expected. Equipment loads shall constitute, if applicable, all load
of equipments to be supported on the building frame.
ii) Floors/slabs shall be designed to carry loads imposed by equipment, cables and other
loads associated with building. Cable load shall also be considered additionally for floors
where these loads are expected.
iii) The floor loads shall be subject to Employer’s approval. Floors shall be designed for live
loads as per relevant IS 875 part 2 (latest), however, for Buildings, the following loads may
be considered.

Roof 1.5 kN/m2 for accessible roofs and

0.75 kN/m2 for in-accessible roofs
RCC-Floor i) 5 kN/m2 for offices
ii) 10 kN/m2 (min.) for equipment floors or
actual requirement, if higher than 10kN/m2 on

Technical Specification, Section: Civil Works Page 31 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 equipment component and layout plans
Stairs & balconies 5 kN/m2

Toilets 2 kN/m2
Chequered plate 4 kN/m2
floor
Walkways 3 kN/m2

iv) For crane loads an impact factor of 30% and lateral crane surge of 10% (lifted weight +
trolley) shall be considered in the analysis of frame according to provisions of IS:875. The
horizontal surge shall be 5% of the static wheel load. Crane load shall be applied as per the
requirement of building.

10.4.3 WIND LOAD

i) The wind loads shall be computed as per IS 875 part 3 (latest), the class of structure for
design, k1 factor, shall be considered under the category as ‘important buildings and
structures like hospitals, communication buildings/towers, power plant structures’ for
Control Room building, GIS hall, Towers, Gantries, equipment structure. For other
buildings/structures wind loads shall be computed as per IS 875 part 3 (latest).
ii) Wind and Seismic forces shall not be considered to act simultaneously.

10.4.4 SEISMIC LOAD

i) Seismic Coefficient method/Response Spectrum method shall be used for the seismic
analysis as per IS: 1893: Part 1 with importance factor 1.5.
ii) Wind and Seismic forces shall not be considered to act simultaneously.

10.4.5 SNOW LOAD

i) Snow load shall be computed as per IS:875 part 4 (latest).

ii) When snow load is present in roofs, replace imposed load by snow load in respective load
combinations.

10.4.6 LOAD COMBINATIONS

i) The critical load combinations for design of RCC structures shall be computed or generated
by using IS: 875 Part-5 (latest), IS: 456 (latest), IS: 1893- part 1 (latest).
ii) The critical load combinations for design of Steel structures shall be computed or
generated by using IS: 875 Part-5 (latest), IS: 800, IS: 1893- part 1 (latest).

Technical Specification, Section: Civil Works Page 32 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
10.5 DESIGN OF FOUNDATIONS FOR BUILDINGS & OTHER SWITCH YARD STRUCTURES:

10.5.1 All foundation shall be of reinforced cement concrete. The design and construction of RCC
structures shall be carried out as per IS: 456. Minimum 75mm thick lean concrete (1:4:8)
shall be provided below all underground structures, foundations, trenches etc. to provide
a base for construction

10.5.2 The switchyard foundation’s plinths shall be minimum 300mm and buildings plinth shall be
minimum 600 mm above finished ground level respectively. If the site is sloping, the
foundation height will be adjusted to maintain the exact level of the top of structures to
compensate such slopes.

10.5.3 The tower and equipment foundations shall be checked for a partial factor of safety of 2.2
for normal condition and 1.65 for short circuit condition.

10.5.4 The design and detailing of foundations shall be done based on the approved soil data and
sub-soil conditions as well as for all possible critical loads and the combinations thereof.
The Isolated/ Combined/ Strip footings / Raft or pile foundation as may be required based
on soil/sub-soil conditions and superimposed loads shall be provided

10.5.5 The procedure used for the design of the foundations shall be the most critical loading
combination of the steel structure and or equipment and/or superstructure and other
conditions which produces the maximum stresses in the foundation or the foundation
component and as per the relevant BIS Codes of foundation design. Detailed design
calculations shall be submitted by the bidder showing complete details.

10.5.6 Necessary protection to the foundation work, if required shall be provided to take care of
any special requirements for aggressive alkaline soil, black cotton soil or any other type of
soil which is detrimental/harmful to the concrete foundations.

10.5.7 If pile foundations are adopted, the same shall be cast-in-situ bored or pre-cast or under
reamed type as per relevant parts of IS: 2911. Only RCC piles shall be provided. Necessary
initial load test shall be carried out by the Contractor to establish the pile design capacity.
Only after the design capacity of pile has been established, the Contractor shall take up the
job of piling. Routine tests for the pile shall also be conducted as per IS: 2911/IS :10262. All
the testing work shall be planned in such a way that these shall not cause any delay in
project completion. RCC for pile works shall be Design Mix of minimum grade M-25 and
also minimum cement content shall be 400Kg/ cu.m as per IS:2911 (Latest revision). In
case extra cement is required to meet the provisions of IS: 2911, it will be paid extra.

Technical Specification, Section: Civil Works Page 33 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
10.5.8 The foundations shall be proportioned so that the estimated total and differential
movements of the foundations are not greater than the movements that the structure or
equipment is designed to accommodate.

10.6 DESIGN OF TRANSFORMER AND REACTOR FOUNDATION:

10.6.1 The foundations of Transformer & Reactor shall be of block type foundation. Minimum
reinforcement shall be governed by IS: 2974 and IS: 456. In case of Reactor Plan
dimension of block should not be less than size of base of reactor.

10.6.2 The Contractor shall provide a RCC Rail cum road system integrated with the
Autotransformer / Reactor foundation to enable installation and the replacement of any
failed unit. The transfer track system shall be suitable to permit the movement of any
failed unit fully assembled (including OLTC, bushings) with oil.

10.6.3 This system shall enable the removal of any failed unit from its foundation to the
nearest road. If trench/drain crossings are required then suitable R.C.C. culverts shall be
provided in accordance with I.R.C. standard / relevant IS.

10.6.4 The Contractor shall provide a pylon support system for supporting the firefighting
system.

10.6.5 Each Autotransformer/Reactor including oil conservator tank and cooler banks etc. shall
be placed in a self-sufficient pit surrounded by retaining walls (Pit walls). The clear
distance of the retaining wall of the pit from the Autotransformer/Reactor shall be 20%
of the Autotransformer/Reactor/ cooler bank height or 0.8m whichever is higher. The
oil collection pit thus formed shall have a void volume equal to 200% volume of total oil
in the Autotransformer/Reactor. In case of transformers of 132kV and below, where
hydrant system for firefighting is not provided, volume of pit may be reduced to 130%
of total oil volume. However, in case common oil pit is envisaged during detailed
engineering, the individual oil collection pit thus formed shall have a void volume equal
to 33% volume of total oil in the Autotransformer/Reactor. The common oil collection
pit shall have a void volume equal to 200% volume of maximum total oil of either
Autotransformer or Reactor.

10.6.6 The minimum height of the retaining walls of pit shall be 20 cm above the finished level
of the ground to avoid outside water pouring inside the pit. The bottom of the pit shall
have a uniform slope towards the sump pit. While designing the oil collection pit, the
movement of the autotransformer / reactor must be taken into account.

10.6.7 The grating shall be made of MS flat of size 30mm x 5mm placed at 30mm centre to
centre and 6mm dia MS bar at spacing of 150mm at right angle to each other.

Technical Specification, Section: Civil Works Page 34 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 Maximum length of grating shall be 2000mm and width shall not be more than 500mm.
The gratings, supported on ISMB 150 mm, shall be placed at the formation level and will
be covered with 100mm thick layer of stone aggregate having size 40mm to 60mm. All
steel work used for grating and supports shall be painted with epoxy based zinc
phosphate primer (two packs) confirming to IS: 13238- 1991, thereafter with two or
more coat of bituminous paint of approved quality shall be applied. Contractor shall
have option to provide factory made electro forged MS grating made of specified size
MS flat and round bars without any extra cost to employer.

10.6.8 Each oil collection pit shall be drained towards a sump pit of size 1000X750mm and
500mm deep below the floor level within the collection pit whose role is to drain water
and oil due to leakage within the collection pit so that collection pit remains dry.

10.7 DESIGN OF FIRE PROTECTION WALLS:

10.7.1 The construction of fire walls shall be cast in situ type or pre cast RCC as per drawings and
meeting the technical specification.

10.7.2 The firewall shall have a minimum fire resistance of 4 hours. The walls of the building,
which are to be used as firewalls, shall have also a minimum fire resistance of 4 hours. The
firewall shall be designed to protect against the effect of radiant heat and flying debris
from an adjacent fire.

10.7.3 The firewall shall extend 600 mm on each side of the Autotransformer or Reactors and 600
mm above the conservator tank or safety vent. A minimum of 2.0 meter clearance shall be
provided between the equipment’s e.g. Autotransformer or Reactors and firewalls. In case
of space constraints, these dimensions can be reduced as per the approval of Employer.

10.7.4 The building walls, which act as firewalls, shall extend at least 1 m above the roof or 600
mm above the conservator tank or safety vent, whichever is maximum, in order to protect
it.

10.7.5 The firewall will be made of reinforced cement concrete with smooth surfaces devoid of
honey comb, undulations etc. and shall be finished with water proofing cement paint of
approved colour.

10.8 DESIGN OF WATER TANKS, CHANNELS, SUMPS, TRENCHES AND OTHER UNDER-GROUND
STRUCTURES:

10.8.1 RCC water retaining structures like storage tanks, etc. shall be designed as un-cracked
section in accordance with IS: 3370 (Part I to IV) by working stress method. In case of

Technical Specification, Section: Civil Works Page 35 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 water channels, shall be designed as cracked section with limited steel stresses as per IS:
3370 (Part I to IV) by working stress method.

10.8.2 All sub-structures shall be checked for sliding and overturning stability during both
construction and operating conditions for various combinations of loads. Factors of safety
for these cases shall be taken as mentioned in relevant BIS Codes or as stipulated
elsewhere in the Specifications. For checking against overturning, weight of soil vertically
above footing shall be taken and inverted frustum of pyramid of earth on the foundation
should not be considered.

10.8.3 Earth pressure for all underground RCC structures like cable trenches, underground water
tanks, Oil collection pits, Septic tanks, basements etc. shall be calculated using co-efficient
of earth pressure at rest, co-efficient of active or passive earth pressure (whichever is
applicable). However, for the design of substructures of any underground enclosures,
earth pressure at rest shall be considered.

10.8.4 In addition to earth pressure and ground water pressure etc., a surcharge load of 2T/Sq.m
shall also be considered for the design of all underground structures for the vehicular
traffic in the vicinity of the structure.

10.8.5 Underground tanks shall be checked for full water pressure from inside and no earth
pressure & ground water pressure & surcharge pressure from outside (application only to
structures which are liable to be filled up with water or any other liquid). They shall also be
checked for full earth pressure, surcharge pressure and ground water pressure from
outside and no water pressure from inside.

10.8.6 Design shall also be checked against buoyancy due to the ground water during
construction and maintenance stages. Minimum factor of safety of 1.5 against buoyancy
shall be ensured ignoring the superimposed loadings. Base slab of any underground
enclosure shall also be designed for empty condition during construction and maintenance
stages with maximum ground water table (GWT). Minimum factor of safety of 1.5 against
buoyancy shall be ensured ignoring the super-imposed loadings.

10.8.7 Base slab of any underground enclosure like water storage tank shall also be designed for
the condition of different combination of pump sumps being empty during maintenance
stages with maximum GWT. Intermediate dividing piers of such enclosures shall be
designed considering water in one pump sump only and the other pumps sump being
empty for maintenance.
10.9 INTERNAL FINISH SCHEDULE FOR BUILDING & GIS HALL EITHER RCC/ PEB:

10.9.1 Internal finishing Schedule for control room building and GIS hall is given in Table - 1
below: The Locations, which are not specified in finish schedule, shall be provided with

Technical Specification, Section: Civil Works Page 36 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 vitrified tile flooring and premium acrylic emulsion paint over two mm thick POP putty.
The below mentioned finishing schedule is also applicable for extension of Control room
or GIS hall unless otherwise mentioned else-where in the Tender. Areas where false
ceiling is provided, electrical conduit may be laid on exposed surfaces of walls or ceiling,
above false ceiling area.

Table-1
Sr. FLOORING WALL CEILING DOOR, WINDOWS &
No & SKIRTING (INTERNAL) VENTILATOR
LOCATION
. 150MM
HIGH
1 Control Vitrified Non VOC False ceiling Windows shall be of min.
Room tiles size acrylic painted with 10mm thick laminated
600 x emulsion paint Non VOC acrylic float safety glass
600mm over 2mm POP emulsion paint conforms to IS: 2553
(DSR Item putty upto to give an even (Part-I) by using suitable
11.46) false ceiling shade. powder coated
over approved aluminum extruded
primer coat sections peripheral
frame. The glazed
window shall be provided
between column to
column horizontally and
vertically from sill level of
0.75 m to bottom false
ceiling. In a window 2 to
3 vertical pieces may be
provided depending
upon the availability of
glass and the vertical
joint shall be sealed with
silicon sealant. All doors
shall be glazed powder
coated aluminium doors
with minimum 5.5 mm
thk. glass
2 Confer- Vitrified Non VOC False ceiling All doors, windows,
ence tiles size acrylic painted with ventilators shall be of
Room 600 x emulsion paint Non VOC acrylic uPVC with minimum
600mm over 2mm POP emulsion paint 5.5.mm thk. Glazing.
(DSR Item putty upto to give an even
11.46) false ceiling shade.

Technical Specification, Section: Civil Works Page 37 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 over approved
primer coat

3 (S/S Vitrified Non VOC False ceiling All doors, windows,

In-charge tiles size acrylic painted with ventilators shall be of
Room) 600 x emulsion paint Non VOC acrylic uPVC with minimum
600mm over 2mm POP emulsion paint 5.5.mm thk. Glazing.
(DSR Item putty upto to give an even
11.46) false ceiling shade.
over approved
primer coat
4 Other Vitrified Non VOC False ceiling All doors, windows,
Office tiles size acrylic painted with ventilators shall be of
Rooms 600 x emulsion paint Non VOC acrylic uPVC with minimum
600mm over 2mm POP emulsion paint 5.5.mm thk. Glazing.
(DSR Item putty upto to give an even
11.46) false ceiling shade.
over approved
primer coat.
5 Electronics Vitrified Non VOC False ceiling All doors, windows,
Test tiles size acrylic painted with ventilators shall be of
Lab. 600 x emulsion paint Non VOC acrylic uPVC with minimum
600mm over 2mm POP emulsion paint 5.5.mm thk. Glazing.
(DSR Item putty false to give an even
11.46) ceiling over shade.
approved
primer coat
6 ACDB& 62mm thick Non VOC Non VOC acrylic All doors, windows,
DCDB cement acrylic emulsion paint ventilators shall be of
Room concrete emulsion paint over approved uPVC with minimum
flooring over 2mm POP primer coat for 5.5.mm thk. Glazing.
with putty upto RCC Building /
hardener false ceiling False ceiling
over approved shall be
primer coat provided in-case
of PEB building.
7 Battery Vitrified Non VOC False ceiling All doors
room tiles size acrylic painted with Windows/ventilator shall
600 x emulsion paint Non VOC acrylic be glazed uPVC doors
600mm over 2mm POP emulsion paint with minimum 5.5.mm
(DSR Item putty upto to give an even thk. Glazing.

Technical Specification, Section: Civil Works Page 38 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 11.46) false ceiling shade.
over approved
primer coat

8 Lobby 18mm thick Non VOC False ceiling All doors, windows,
granite acrylic painted with ventilators shall be of
flooring ( emulsion paint Non VOC acrylic uPVC with minimum
DSR Item ove r2mm POP emulsion paint 5.5.mm thk. Glazing.
8.12) putty upto to give an even
false ceiling shade.
over approved
primer coat
9 Corridor Vitrified Non VOC False ceiling All doors, windows,
tiles size acrylic painted with ventilators shall be of
600 x emulsion paint Non VOC acrylic uPVC with minimum
600mm over 2mm POP emulsion paint 5.5.mm thk. Glazing.
(DSR Item putty upto to give an even
11.46) false ceiling shade.
over approved
primer coat
10 Portico for 18mm thick Granite Non VOC acrylic All doors, windows,
RCC granite cladding emulsion paint ventilators shall be of
Building flooring( over approved uPVC with minimum
DSR Item primer coat 5.5.mm thk. Glazing.
8.12)
11 Toilet Ceramic DADO glazed Non VOC acrylic All windows, ventilators
tiles (DSR tile 2100mm emulsion paint shall be of uPVC with
item 11.38) high, above over approved minimum 5.5.mm thk.
that non VOC primer coat for Glazing.
acrylic RCC building / All doors shall be flush
emulsion paint False ceiling door shutters made of
over 2 mm shall be pre-laminated particle
thick POP provided in-case board (DSR 9.131 &
putty along of PEB building. 9.132) with powder
with primer coated aluminum frame.
coat.
12 Janitor Ceramic DADO glazed Non VOC acrylic All windows, ventilators
room tiles (DSR tile 2100mm emulsion paint shall be of uPVC with
item 11.38) high, above over approved minimum 5.5.mm thk.
that non VOC primer coat for Glazing.
acrylic RCC building / All doors shall be flush
emulsion paint False ceiling door shutters made of
Technical Specification, Section: Civil Works Page 39 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 over 2mm thk. shall be pre-laminated particle
POP putty provided in-case board (DSR 9.131 &
along with of PEB building. 9.132) with powder
primer coat. coated aluminium frame.

13 GIS 62mm thick Non VOC In case of RCC All doors, windows,
Hall cement acrylic roof, ceiling ventilators shall be of
concrete emulsion paint shall be finished uPVC with minimum
flooring over 2mm POP with Non VOC 5.5.mm thk. Glazing.
with putty upto acrylic emulsion
hardener. false ceiling paint over
Two coats over approved approved
of PU primer coat primer coat.
coating over plastered
over the surface
floor shall
be
provided.
over the
total area
(Present +
Future).
The final
coat of PU
shall be
applied
after
Installation
of
equipments
. Total
thickness of
PU coats
shall be
minimum
300
microns.

14 Panel/ Vitrified Non VOC False ceiling All doors, windows,

Relay tiles 8mm acrylic painted with ventilators shall be of
Room/ thick size emulsion paint Non VOC acrylic uPVC with minimum

Technical Specification, Section: Civil Works Page 40 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 Communic 600 x over 2mm POP emulsion paint 5.5.mm thk. Glazing.
ation 600mm putty upto to give an even
Room false ceiling shade.
over approved
primer coat
primer coat
over plastered
surface
15 AHU 62mm thick Non VOC RCC ceiling All windows, ventilators
Room cement acrylic finished with shall be of uPVC with
concrete emulsion paint non-VOC acrylic minimum 5.5.mm thk.
flooring over 2mm POP emulsion paint Glazing.
with putty upto over approved All doors shall be flush
hardener false ceiling primer coat. door shutters (35mm thk.
over approved block board with
primer coat commercial veneer on
primer coat both side with lipping)
over plastered with powder coated
surface aluminium frame.

uPVC doors, windows, ventilators shall be sliding or openable or partially openable/partially fixed
or fixed type of factory made uPVC doors, windows (casement/sliding), ventilators, fixed glazing
and partitions as per DSR ’16 item no. 9.147A to 9.147F.

10.10 FALSE CEILING DETAILS:

10.10.1 For the locations of false ceiling refer table -1 above, unless otherwise specified
elsewhere in tender documents.

10.10.2 15mm thick densified tegular edged eco friendly light weight calcium silicate false ceiling
tiles of approved texture spintone/cosmos/ Hexa or equivalent of size 595x595 mm in
true horizontal level, suspended on inter locking metal grid of hot dipped galvanised
steel sections (galvanising @ 120 grams per sqm. Including both side).

Consisting of main ‘T’ runner suitably spaced at joints to get required length and of size
24x38 mm made from 0.33 mm thick (minimum) sheet, spaced 1200 mm centre to
centre, and cross ‘T’ of size 24x28 mm made out of 0,33 mm (minimum) sheet, 1200 mm
long spaced between main ‘T’ at 600 mm centre to centre to form a grid of 1200x600
mm and secondary cross ‘T’ of length 600 mm and size of 24x28 mm made of 0.33 mm
thick (minimum) sheet to be interlocked at middle of the 1200x600 mm panel to form
grid of size 600x600 mm, resting on periphery walls/partitions on a perimeter wall angle
precoated steel of size (24x24x300 mm made of 0.40 mm thick (minimum) sheet with

Technical Specification, Section: Civil Works Page 41 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 the help of rawl plugs at 450 mm centre to centre with 25 mm long drywall screws @230
mm interval and laying 15 mm thick densified edges calcium silicate ceiling tiles of
approved texture (Spintone/ Cosmos/ hexa) in the grid, including, cutting/making
openings for services like diffusers, grills, light fittings, fixtures, smoke detectors etc.,
Wherever required.

Main ‘T’ runners to be suspended from, ceiling using G.I. slotted cleats of size 25x35x1.6
mm fixed to ceiling with 12.5 mm dia and 50 mm long dash fasteners, 4 mm G.I.
adjustable rods with galvanised steel level clips of size 85x30x0.8 mm, spaced at 1200
mm centre to centre along main ‘T’, bottom exposed with 24 mm of all T-section shall be
pre-painted with polyester baked paint, for all heights, as per specifications, drawings
and as directed by engineer- in-charge.

10.11 WATER PROOFING TREATMENT

10.11.1 Integral cement based water proofing treatment including preparation of surface as
required for treatment of roofs, balconies, terraces etc consisting of following operations:

a) Applying a slurry coat of neat cement using 2.75 kg/sqm. of cement admixed with water
proofing compound conforming to IS. 2645 and approved by Engineer-in-charge over the
RCC slab including adjoining walls upto 300mm height including cleaning the surface
before treatment.
b) Laying brick bats with mortar using broken bricks/brick bats 25 mm to 115 mm size with
50% of cement mortar 1:5 (1 cement : 5 coarse sand) admixed with water proofing
compound conforming to IS : 2645 and approved by Engineer-in-charge over 20 mm thick
layer of cement mortar of mix 1:5 (1 cement :5 coarse sand ) admixed with water proofing
compound conforming to IS : 2645 and approved by Engineer-in-charge to required slope
and treating similarly the adjoining walls upto 300 mm height including rounding of
junctions of walls and slabs
c) After two days of proper curing applying a second coat of cement slurry using 2.75 kg/ sqm
of cement admixed with water proofing compound conforming to IS : 2645 and approved
by Engineer-in-charge.

d) Finishing the surface with 20 mm thick joint less cement mortar of mix 1:4 (1 cement :4
coarse sand) admixed with water proofing compound conforming to IS : 2645 and
approved by Engineer-in-charge including laying glass fibre cloth of approved quality in top
layer of plaster and finally finishing the surface with trowel with neat cement slurry and
making pattern of 300x300 mm square 3 mm deep.

e) The whole terrace so finished shall be flooded with water for a minimum period of two
weeks for curing and for final test. All above operations to be done in order and as
directed and specified by the Engineer-in-Charge

Technical Specification, Section: Civil Works Page 42 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 f) With average thickness of 120mm and minimum thickness at khurra as 65 mm.

10.11.2 Alternatively in case of non- availability of good quality of brick bats, the water proofing
treatment can also be done in the following manner:
The water proofing membrane shall be laid on the RCC slab without any break. The grading
concrete (1:2:4) of average thickness of 50 mm with water proofing compound as per
manufacturer’s specification shall be laid over the membrane. Cement concrete flooring of
40mm thick with (1cement: 2 fine aggregate: 4 stone aggregate 20mm graded stone
aggregate) finished with a floating coat of neat cement including cement slurry complete
shall be laid over grading concrete and checkered pattern in the grid of 300mm x 300mm
shall be made .

10.11.3 SUNKEN WATER PROOFING (RCC):

 Water proofing treatment shall be done in sunken portion of WCs, bathroom etc. by
applying cement slurry mixed with water proofing cement compound consisting of:
a) First layer of slurry of cement @ 0.488 kg/sqm mixed with water proofing cement
compound @ 0.253 kg/ sqm. This layer will be allowed to air cure for 4 hours.
b) Second layer of slurry of cement @ 0.242 kg/sqm mixed with water proofing cement
compound @ 0.126 kg/sqm. This layer will be allowed to air cure for 4 hours followed with
water curing for 48 hours.
 Treatment and sealing of joints, corners, junction of pipes and masonary with polymer
mixed slurry shall be carried out as per CPWD specifications.

10.12 SPECIFICATION FOR PLUMBING, SANITATION & WATER SUPPLY ETC:

10.12.1 All plumbing and sanitation shall be executed to comply with the requirements of the
appropriate bye-laws, rules and regulations of the Local Authority having jurisdiction
over such matters. The Contractor shall arrange for all necessary formalities to be met in
regard to inspection, testing, obtaining approval and giving notices etc.

10.12.2 Provision for water cooler shall be provided at suitable location.

10.12.3 Each toilet shall be provided with Water Closet, Wash hand basin, health faucet, Mirror,
Towel Rail, Paper Holder, Liquid soap dispenser, twin coat holder.

10.12.4 In addition to general requirements of each toilets, 2 nos. Sensor based urinals shall be
provided for common Gents toilet.

10.12.5 Pantry shall be provided with stainless steel kitchen sink.

Technical Specification, Section: Civil Works Page 43 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
10.12.6 The platform of kitchen sink and wash hand basin shall be provided with 18 mm thk.
Mirror polished approved granite stone.

10.12.7 The specification of different items, which are to be used for plumbing, sanitation &
water supply etc. in are given below, the same shall be used during detailed engineering,
unless otherwise mentioned else-where in the tender.
S.No. Items Description
1 Wall hung Coloured vitreous china extended wall mounting water closet of
Water Closet approved size and shape including providing & fixing white vitreous
china cistern with dual flush fitting, of flushing capacity 3 litre/6 litre
(adjustable to 4 litre/8 litres), including seat cover, and cistern
fittings, nuts, bolts and gasket etc complete.
2 Squatting Pan (Indian type W.C. pan ) (white vitreous china Orissa pattern W.C. pan
of size 580x440mm with integral type foot rests) shall be with
100mm sand cast iron P or S trap. 10 litre low level white P.V.C
flushing cistern with manually controlled device (handle lever)
conforming to IS:7231, with all fittings and fixtures complete
including cutting and making good the walls and floors wherever
required.
3 Wash Basin Providing and fixing coloured wash basin counter type of
(approximate size 630x450mm size under counter or over counter
type), in case flat bash hand is required the approximate size shall be
550x400mm and shall be provided with C.P. close basin mixer (ISI
approved) with CI. Brackets taps with battery based infrared
sensor, 32mm C.P. brass waste and bottle trap of standard pattern,
including painting of fittings and brackets, cutting and making good
the walls wherever required. Other details shall be as per the
drawings.
4 Urinal White vitreous china battery based infrared sensor operated urinal
of approx. size 610 x 390 x 370 mm having pre & post flushing with
water ( 250 ml & 500 ml consumption), having water inlet from back
side, including fixing to wall with suitable brackets all as per
manufacturers specification and direction of Engineer-in-charge.
5 Urinal 10mm thk toughened glass partition with frosted film to be fixed in
partition position for urinals on appropriate stainless steel patch fittings of
desired shape and size

6 Kitchen sink Stainless steel AISI 304 (18/8) Kitchen sink of 510x1040 mm bowl
with depth of 178mm with drain board shall be provided and fixed
as per IS 13983 with C.I brackets, and stainless steel plug 40mm with
provision of 2 nos. CP brass long body bib cock conforming to IS
Standard and weighing not less than 650 gm for CP bottle trap etc.
Technical Specification, Section: Civil Works Page 44 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 including painting of fittings and brackets, cutting and making good
the wall.

7 Bib cock C.P. brass short body and long body bib cock 15mm nominal bore
shall be of approved quality conforming to IS: 8931.

8 Angle valve C.P. brass angle valve of 15mm nominal bore provided and fixed in
position for basin and cistern points of approved quality conforming
IS :8931.

9 Towel rail C.P. brass towel rail of approved make of 600mm length, 25mm dia
with a pair of brackets or flanges provided and fixed to wall beside
each wash basin/set of wash basin with necessary screws, plugs, etc.

10 Mirror 6mm thick beveled edge mirror approximate size 1000x600mm

made of superior glass of approved make complete with a backing of
6 mm thick water proof hard board fixed to wooden cleats with
25mm dia SS studs, washers etc complete for each wash basin.

11 Hooks Double type coat & hat hooks with flanges, fixed to wall / shutter,
etc. with necessary screws, washers & plugs.

12 Liquid soap C.P. brass liquid soap holder of approved make fixed with each wash
holder basin to the wall with necessary CP brackets, CP screws, washers,
plugs etc.
13 C.P. Brass or Approved C.P. Brass cockroach trap shall be provided in the Kitchen,
S.S. cockroach Toilets and pantry
trap
14 Floor traps PVC floor traps of self cleansing design shall be provided & fixed in
position with 100 mm dia. inlet and 75mm dia. outlet of approved
make, including making connection with PVC soil/waste pipes using
rubber gaskets, embedding the trap in 150 mm thick PCC 1:2:4.
15 Internal Soil, Unplasticised rigid PVC pipes of 75mm for waste & 110mm dia for
waste and soil shall be provided conforming to IS:13592 type B and all its
vent pipe fittings like bends, sockets, door bend, Y-tee etc. as per requirement
with seal ring conforming to IS: 5382 including jointing with cement
solvent conforms to IS:14182. All underground or under floor pipes
shall be encased with 1:3:6 concrete. Minimum concrete cover shall
be 75 mm thk.

Technical Specification, Section: Civil Works Page 45 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 16 Rain Water a) Unplasticised rigid PVC rain water pipes of required dia shall be
Pipe and provided and fixed on the wall face conforming to IS: 13592
fittings type A as per requirement including jointing with seal ring
conforming to IS: 5382 leaving 10mm gap for thermal expansion
single socketed pipes including all fittings like bends, bat clamps
gratings etc.
b) Unplasticised PVC Moulded fittings/accessories including
suitable dia. bend & shoes shall be provided and fixed for
unplasticised rigid PVC rain water pipes conforming to IS:13592
type A including jointing with seal ring conforming to IS: 5382
leaving 10mm gap for thermal expansion.
c) Clips of approved design shall be provided and fixed to
unplasticised PVC rain water pipes by means of 50x50x50mm
hard wood plugs, screwed with MS screws of required length
including cutting brick work and fixing in cement mortar1:4 (1
cement : 4 coarse sand) and making good the wall etc
17 Internal & a) All CPVC pies and fittings shall conform to IS:15778
External water b) All internal CPVC pipe shall be concealed including cutting of
supply chases and making good the wall.
c) Wherever CPVC pipes are buried the same shall be provided and
laid in position including trenching, sand cushion and refilling,
etc. For trenching, sand cushion and refilling refer CPWD
specification applicable for external piping work.
d) All internal CPVC pipe shall be concealed including cutting of
chases and making good the wall.
e) ISI approved CPVC ball valve, non-return valves shall be provided
and fixed in position as per requirement and direction of
Engineer-in-charge.
18 Water storage Triple layered Polyethylene water storage tanks shall be provided of
tanks approved brand and manufacture with cover and suitable locking
arrangement, float valve and making necessary holes for inlet, outlet
and overflow pipes. Capacity of water tank shall be 2x1500 litres for
control room, 2X2000 litres for Transit Camp.
19 Sluice valve Masonry chamber for sluice valve shall be 600x600mm size in plan
chamber and depth 750mm, or matching with the site condition inside with
50 class designation brick work in cement mortar 1:5 (1 cement : 5
fine sand) with CI surface box 100 mm. Top diameter, 160 mm
bottom dia and 180 mm deep (inside) with chained lid and RCC top
slab 1:2:4 mix (1cement : 2 coarse sand: 4 graded stone aggregate
20 mm nominal size) necessary excavation foundation concrete
1:5:10 (1 cement : 5 fine aggregate : 10 graded stone aggregate 40
mm nominal size) and inside plastering with cement mortar 1:3 (1
Technical Specification, Section: Civil Works Page 46 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 cement : 3 coarse sand) 12 mm thick finished with a floating coat of
neat cement complete as per standard design with FPS bricks of
class 75.

20 External Glazed stoneware pipes of 100 & 150mm diameter grade 'A' shall be
Sewerage provided, laid and jointed with stiff mixture of cement mortar in the
proportion of 1:1 (1cement :1 fine sand ) including testing of joints
etc. complete. SW pipes shall be encased with Cement concrete
1:5:10 (1 cement: 5 coarse sand: 10 graded stone aggregate 40 mm
nominal size) including bed concrete as per CPWD standard design
and CPWD specifications. In case of non-availability of SW Pipe,
contractor may use UPVC Pipe of similar dia with the prior approval
of EIC without any financial implication to POWERGRID.
21 Gully trap 100x100 mm or 150x100 mm size P type Square-mouth S.W. gully
trap class SP-1 complete with C.I. grating brick masonry chamber
and water tight C.I. cover frame o f 300 x300 mm size (inside), the
weight of cover to be not less than 4.50 kg and frame to be not less
than 2.70 kg as per standard design. FPS Bricks class designation 75
shall be provided for brick masonry chamber.
22 Manholes FPS brick masonry manhole shall be constructed in cement mortar
1:4 (1 cement :4 coarse sand ) RCC top slab with 1:2:4 mix ( 1
cement : 2 fine aggregate : 4 graded stone aggregate 20 mm
nominal size ) foundation concrete 1:4:8 mix ( 1cement : 4 coarse
sand :8 graded stone aggregate 40 mm nominal size ) inside
plastering 12 mm thick with cement mortar 1:3 (1 cement : 3 coarse
sand ) finished with floating coat of neat cement and making
channels in cement concrete 1:2:4 ( 1 cement: 2 coarse sand :4
graded stone aggregate 20 mm nominal size ) finished with a floating
coat of neat cement complete as per standard design. The size and
depth of manhole shall be suitably decided based on requirement of
layout in line with CPWD specification.
a) Inside size shall be 90 x 80 cm and 60 cm deep including CI
cover with frame (light duty) 455 x 610 mm internal
dimensions total weight of cover and frame shall not be less
than 38 kg (weight of cover 23 kg and weight of frame 15 kg)
and shall be constructed with F.P.S. bricks with class
designation 75.
b) Inside size shall be 120 x 90 cm and 90 cm or more deep
including CI cover with frame (medium duty) 500mm internal
diameter total weight of cover and frame to be not less than
116 kg (weight of cover 58 kg and weight of frame 58 kg) with
FPS Bricks class designation 75.

Technical Specification, Section: Civil Works Page 47 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 23 Foot Rest Orange colour safety foot rest of minimum 6 mm thick plastic
encapsulated as per IS : 10910, on 12 mm dia steel bar conforming
to IS: 1786, having minimum cross section as 23 mmx25 mm and
over all minimum length 263 mm and width as 165 mm with
minimum 112 mm space between protruded legs having 2 mm tread
on top surface by ribbing or chequering besides necessary and
adequate anchoring projections on tail length on 138 mm as per
standard drawing and suitable to with stand the bend test and
chemical resistance test as per specifications and having
manufacture’s permanent identification mark to be visible even
after fixing, fixing in manholes with 30x20x15 cm cement concrete
block 1:3:6 (1 cement : 3 fine aggregate : 6 graded stone aggregate
20 mm nominal size) complete.

24 Road Gully Brick Masonry road gully chamber of 50x45x60cm shall be provided
Chamber with FPS brick with cement mortar 1:4 including 500x450mm pre
cast RCC Horizontal/vertical grating with frame complete.

11.0 MATERIAL SPECIFICATION FOR ALL PRE-ENGINEERED BUILDINGS:

11.1 STRUCTURAL STEEL MEMBERS:

11.1.1 Primary structural framing shall include the transverse rigid frames, columns, corner
columns, end wall wind columns and crane gantry girders and Frames at Door openings.

11.1.2 Primary members are fabricated from plates and sections with minimum yield strength of
340 Mpa to suit design by continuous double side welding.

11.1.3 All miscellaneous structural members, rod bracings, angle bracings, pipe bracings, wind
bracings, sag rods, etc. shall conform to the physical specification of IS: 2062 with a
minimum 245Mpa Yield Strength.

11.1.4 All welded structural steel members shall be provided with suitable treatment of shot
blasting before application of steel primer.

11.1.5 All structural steel members including walk way structural steel members shall be painted
with a steel priming coat followed by one coat of epoxy paint and final coating of PU
(Minimum 100 Micron).

11.1.6 The structural steel members of cage ladder shall be galvanized with 610 gm/sqm.

Technical Specification, Section: Civil Works Page 48 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
11.2 PURLINS AND GIRTS MEMBERS:

11.2.1 Purlins, girts, necessary clips and other cold rolled structural members shall conform to
the physical specification of ASTM A570 (Grade 50) or equivalent IS Standards having a
minimum yield strength of 340 MPa and shall be of Pre galvanised having a total coating
thickness of 275 gm/sqm. inclusive of both sides.

11.2.2 The minimum thickness of secondary members shall be 2.5mm.

11.3 ROOF & WALL SHEETING:

11.3.1 Factory assembled 50mm thick puff (overall average density 40kg/cu.m. +/- 2 Kg/cu m as
per IS: 11239 Part-2) sandwiched panels shall be provided. These panels shall be made of
puff insulation sandwiched between two high tensile steel sheets each of 0.5 mm thickness.
The material of sheets shall confirm to ASTM 792 M with minimum yield strength of 340
Mpa. However, higher grades of steel sheet may be supplied without any further cost
implication.

11.3.2 The steel sheets shall be provided with hot dip coating of Zinc aluminium alloy
(approximately 55% Al, 43.5% Zn and 1.5 % silicon).Total mass of zinc aluminium alloy
coating shall be minimum 150 gm/Sq. m inclusive of both sides. The tolerance of base metal
thickness (BMT) of steel sheet shall be as per IS 16163. After hot dip coating of Zinc
aluminium alloy, the sheet shall be provided with steel primer and silicon modified
polyester (SMP) paint. The total thickness of primer and paint shall be 40 microns inclusive
of both sides (TCT) comprising of 20 microns of SMP paint on top surface and 10 microns of
backer coat (polyester coat) on back surface over 5 microns thick primer each on both
surfaces with inorganic pigments coated free from heavy metals. Painting shall conform to
IS: 15965. In case SMP paint is not available, Super Durable Polyester paint (SDP) can also
be used by the bidder without cost implication to POWERGRID.

11.4 SHEETING FASTENERS:

Standard fasteners shall be self tapping zinc plated metal screws with EPDM bonded zinc
plated washers. All screws shall be colour coated to match roof and wall sheeting.

11.5 SEALER:

This is to be applied at all side laps and end laps of roof panels and around self
flashing windows. Sealer shall be pressure sensitive elastomeric Butyl tapes. The
sealer shall be non-asphaltic, non-shrinking and non toxic and shall be superior
adhesive metals, plastics and painted at temperatures from 51°C to +104°C.

Technical Specification, Section: Civil Works Page 49 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
11.6 CLOSURES:

Solid or closed cell closures matching the profiles of the panel shall be installed
along the eaves, rake and other locations. It should be specifically specified on drawings.
The steel sheets shall be provided with hot dip coating of Zinc aluminium alloy
(approximately 55% Al, 43.5% Zn and 1.5 % silicon).Total mass of zinc aluminium alloy
coating shall be minimum 200 gm/Sq. m inclusive of both sides. The tolerance of base metal
thickness (BMT) of steel sheet shall be as per IS 16163. After hot dip coating of Zinc
aluminium alloy, the sheet shall be provided with steel primer and silicon modified
polyester (SMP) paint. The total thickness of primer and paint shall be 40 microns inclusive
of both sides (TCT) comprising of 20 microns of SMP paint on top surface and 10 microns of
backer coat (polyester coat) on back surface over 5 microns thick primer each on both
surfaces with inorganic pigments coated free from heavy metals. Painting shall conform to
IS: 15965. In case SMP paint is not available, Super Durable Polyester paint (SDP) can also
be used by the bidder without cost implication to POWERGRID.

11.7 FLASHING AND TRIM:

Flashing and / or trim shall be furnished at the rake, corners, eaves, and framed openings
and wherever necessary to provide weather tightness and finished appearance. Colour
shall be matching with the colour of wall. The steel sheets shall be provided with hot dip
coating of Zinc aluminium alloy (approximately 55% Al, 43.5% Zn and 1.5 % silicon).Total
mass of zinc aluminium alloy coating shall be minimum 200 gm/Sq. m inclusive of both
sides. The tolerance of base metal thickness (BMT) of steel sheet shall be as per IS 16163.
After hot dip coating of Zinc aluminium alloy, the sheet shall be provided with steel primer
and silicon modified polyester (SMP) paint. The total thickness of primer and paint shall be
40 microns inclusive of both sides (TCT) comprising of 20 microns of SMP paint on top
surface and 10 microns of backer coat (polyester coat) on back surface over 5 microns thick
primer each on both surfaces with inorganic pigments coated free from heavy metals.
Painting shall conform to IS: 15965. In case SMP paint is not available, Super Durable
Polyester paint (SDP) can also be used by the bidder without cost implication to
POWERGRID.

11.8 WALL LIGHTS:

For day lighting purpose of GIS hall, minimum 2 mm thick approved translucent
polycarbonate sheet shall be provided for wall lighting in addition to windows for at least
10% of wall area on upper portion of both long walls. The polycarbonate sheet shall be
fixed with necessary EPDM/rubber gasket, Silicon Sealant, cold forged fastener, aluminum
profile etc. including MS supporting structural steel (conforming to IS:1161/4923) frame to
ensure water tight arrangement.

Technical Specification, Section: Civil Works Page 50 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
11.9 CONNECTIONS:

11.9.1 SITE CONNECTIONS

i) All primary bolted connections sh a l l be provided with galvanized high strength

bolts, washers, nuts conforming to specifications of grade 8.8 of IS 1367/IS:3357

ii) All secondary bolted connections shall be furnished with bolts, nuts, washers
conforming to the specifications of grade 4.6 of IS 1367 or ASTM-A307.

11.9.2 SHOP CONNECTIONS

All shop connections shall be welded with appropriate arc welding process and welding
shall be in accordance with IS: 816, IS -818 ,IS1024, IS:1261, IS1323, IS-9595, AWSD 1.1.
as appropriate. The Webs should be welded on to the flanges at both the faces at top
and bottom for columns, beams and crane girders. Weld material should have strength
more than the parent metal.

11.10 GUTTERS AND DOWN SPOUTS:

Gutters and downspouts shall be adequately designed to ensure proper roof drainage
system. The steel sheets shall be provided with hot dip coating of Zinc aluminium alloy
(approximately 55% Al, 43.5% Zn and 1.5 % silicon).Total mass of zinc aluminium alloy
coating shall be minimum 200 gm/Sq. m inclusive of both sides. The tolerance of base metal
thickness (BMT) of steel sheet shall be as per IS 16163. After hot dip coating of Zinc
aluminium alloy, the sheet shall be provided with steel primer and silicon modified
polyester (SMP) paint. The total thickness of primer and paint shall be 40 microns inclusive
of both sides (TCT) comprising of 20 microns of SMP paint on top surface and 10 microns of
backer coat (polyester coat) on back surface over 5 microns thick primer each on both
surfaces with inorganic pigments coated free from heavy metals. Painting shall conform to
IS: 15965. In case SMP paint is not available, Super Durable Polyester paint (SDP) can also
be used by the bidder without cost implication to POWERGRID.

12.0 VENDORS & MQP FOR PEB BUILDINGS

12.1 All the material required for Pre-engineered (steel) building shall be procured from
approved vendors as per list of compendium of vendors available on POWERGRID web site
or any other reputed manufacturer for which prior approval shall be obtained from
POWERGRID.

Technical Specification, Section: Civil Works Page 51 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
12.2 Manufacturing of various parts of the building shall start only after approval of
“Manufacturing Quality Plan”. Design and structural drawings shall be approved by
POWERGRID.

12.3 Shop/fabrication showing each and every detail along with bill of material for all members
of structures, joints, nuts & Bolts, welding shall be prepared and approved by venders as
per standard practice of fabrication based on POWERGRID approved design and structural
drawings.

12.4 Complete material shall be offered for inspection by CC (Corporate Centre) QA&I
department before dispatch. Inspection of Material by POWERGRID CC QA &I deptt. shall
be carried out based on Shop/fabrication drawing and BOM as approved by Vendors.
Approval of BOM and shop/fabrication drawings from Employer is not required.

13.0 GENERAL SPECIFICATION FOR BUILDINGS:

These clauses are applicable for Buildings, which are to be constructed as per drawings provided
by employer such as CRB, transit camp, residential buildings, switch yard panel room and fire
water pump house with fire water tank. Architectural drawings of buildings covered in the scope
are enclosed with the tender documents and are also available on website. These drawings are
good for construction except for foundation drawings of the buildings which will be issued to the
successful bidder after award of work and after receipt of soil investigation report depending
upon soil parameters.

This shall also be applicable for vendor designed buildings wherever applicable.

In case of CRB and GIS halls, most of the finishing items are explained in previous clauses, if any of
items are missed or may be required for completion of the same, the below mentioned clauses
may also be referred.

13.1 The material specification, workmanship and acceptance criteria shall be as per approved
standard Field Quality Plan attached with this document which is available on POWERGRID
web site. In case certain item is not covered in FQP, it shall be constructed as per CPWD
specification.

13.2 Post constructional Anti termite treatment shall be carried out for all buildings as per DSR
item no. 2.34 & 2.35. Anti termite chemical treatment shall be given to column pits, wall
trenches, foundations of buildings, filling below the floors etc. as per IS: 6313 and other
relevant Indian Standards.

Technical Specification, Section: Civil Works Page 52 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
13.3 Reinforced cement concrete with controlled water cement ratio as per IS-code shall be
used for all underground concrete structures such as pump-house, tanks, and water
retaining structures for achieving water-tightness.

13.4 FPS or Modular clay/fly ash based Bricks having minimum 75 kg/cm2 compressive strength
can only be used for masonry work. Contractor shall ascertain himself at site regarding the
availability of bricks of minimum 75 kg/cm2 compressive strength before submitting his
offer. However, Contractor can propose to use aerated concrete block or solid concrete
blocks of compressive strength not less than 75kg/cm2 without any cost implication to
POWERGRID.

13.5 Full brickwork shall be provided with cement mortar 1:6 (1cement: 6 coarse sand). Half
brick work masonry shall be provided with cement mortar 1:4 (1cement: 4coarse sand)
and two no 6mm dia ms bar at every third course.

13.6 12mm cement plaster of mix 1:6 (1cement: 6 fine sand) shall be provided on the smooth
side of internal walls. However rough side of walls shall be provided with 15mm cement
plaster of mix 1:6 (1cement: 6 fine sand).

13.7 External plaster in two coats - 18mm Cement plaster in two coats under layer 12mm thick
cement plaster 1:5 (1 cement: 5coarse sand) finished with a top layer 6mm thick cement
plaster (1cement : 6 fine sand). External plastered surface shall be finished with white
cement based putty of average thickness 1 mm, of approved brand and manufacturer to
prepare the surface even and smooth. After putty the walls shall be finished with Premium
Acrylic Smooth exterior paint of approved brand and manufacturer with Silicone additives
of required shade (Two or more coats applied @ 1.43 ltr/ 10 sqm. over and including
priming coat of exterior primer applied @ 2.20 kg/ 10 sqm).

13.8 6 mm thk. Cement plaster of mix 1:3 (1 cement: 3 fine sand) to RCC ceiling shall be done
except areas where false ceiling are provided.

13.9 Internal walls shall be finished with Plaster of Paris putty of average thickness 2 mm, of
approved brand and manufacture, over the plaster surface to prepare the surface even
and smooth complete. In case plastered surface of buildings are covered under wall
paneling, dado work, skirting etc. no putty and painting are required.

13.10 Internal walls shall be painted with minimum two coats of premium acrylic emulsion paint
having VOC (volatile organic compound) content less than 50gm per litre of approved
brand and manufacture including applying additional coats wherever required, to achieve
even shade and colour over priming coat as per manufacturer specification/
recommendation.

Technical Specification, Section: Civil Works Page 53 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
13.11 Non - VOC premium acrylic emulsion paint having volatile organic compound content less
than 50gm per litre of approved brand and manufacture shall be used wherever specified.

13.12 Painting with synthetic enamel paint of approved brand and manufacture of required
colour to give an even shade shall be provided on the steel doors, flush doors and rolling
shutters in various buildings or as specified in the drawings. Two or more coats over an
under coat of suitable shade with primer paint of approved brand and manufacture.

13.13 Two or more coats of French spirit polishing with a coat of wood filler shall be provided on
the wooden doors and frames.

13.14 Polished vitrified tiles in 60x60 cm size (thickness to be specified by the manufacturer) in
flooring and skirting, with water absorption’s less than 0.08% and conforming to IS: 15622
of approved make in all colours and shades, laid on cement mortar 20mm thick min. for
flooring & 12mm thick for skirting 1:4 (1 cement: 4coarse sand) including grouting the
joints with white cement and matching pigments etc., complete.

13.15 Glazed Ceramic floor tiles 300x300mm (thickness to be specified by the manufacturer) of
1st quality conforming to IS:15622 of approved make in colours as approved by Engineer-
in-charge in toilet and pantries area on 20mm thick min. cement mortar 1:4 (1 cement :
4coarsesand) including grouting the joints with white cement and matching pigments etc.,
complete.

13.16 62 mm thick cement concrete flooring with concrete hardener topping, under layer 50 mm
thick cement concrete 1:2:4 (1 cement: 2 fine aggregate : 4 graded stone aggregate 20mm
nominal size) and top layer 12mm thick cement hardener consisting of mix 1:2 (1 cement
hardener mix: 2 graded stone aggregate, 6mm nominal size) by volume, hardening
compound mixed @ 2 litre per 50 kg of cement or as per manufacturer’s specifications.

13.17 Cement plaster skirting (up to 15 cm height) with cement mortar 1:3 (1 cement: 3 coarse
sand) mixed with metallic concrete hardener in same ratio as for floor finished with a
floating coat of neat cement. 21 mm thick in ACDB/DCDB room.

13.18 Granite stone of 18mm thick gang saw cut mirror polished pre-molded and pre-polished,
machine cut for of required size of approved shade, colour and texture laid over 20mm
thick base cement mortar 1:4 (1 Cement: 4 coarse sand) with joints treated with white
cement, mixed with matching pigment, epoxy touch ups, including rubbing, curing molding
and polishing to edge to give high gloss finish etc. complete for staircase.

13.19 Granite stone of flooring with 18mm thick gang saw cut mirror polished premoulded and
prepolished, machine cut for of required size of approved shade, colour and texture laid
over 20mm thick cement mortar 1:4. The joints are filled with jointing compound matching

Technical Specification, Section: Civil Works Page 54 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 to the granite. Wherever granite is specified for the floor, 100mm granite skirting shall be
provided with the walls. The granite outer surface shall be flushed to the plaster finish of
the wall by molding / beveling of granite at top edge.

13.20 Granite counter of approved shade shall be provided and fixed with 18mm thick gang saw
cut, mirror polished, premoulded and pre-polished, machine cut for pantry & kitchen
platform facias and similar locations of required size, approved shade, colour & texture
laid over 20mm thick base cement mortar 1:4 ( 1cement : 4 Coarse sand) joints treated
with white cement, mixed with matching pigment, epoxy touch ups, including rubbing,
curing moulding and polishing to edges to give high gloss finish etc complete at all levels.

13.21 Ceramic glazed wall tiles of 1st quality conforming to IS: 15622 (thickness to be specified
by the manufacture) of approved make in all colours, shades as approved by Engineer-in-
Charge in dados over 12mm thick bed of cement Mortar 1:3 (1 Cement: 3 Coarse sand)
and jointing with grey cement slurry @ 3.3kg per sqm including pointing in white cement
mixed with pigment of matching shade complete. Height of dado shall be 2.1m high in
toilets, kitchen and pantry or elsewhere specified in the drawings or TS.

13.22 Rolling shutters shall be seamless galvalume motorized rolling shutters, with inclusion of
features as under:

Slat material (Shutter min. 1.0 mm steel slate (Galvalume)

curtain):

Slat profiles min. 100mm wide

Side guide GI side guides min. 75mm

Especially design guides with wind locks for high wind

velocity exposed shutters.

Nylofelt seals fitted on the shutter skin for frictionless

movement within the guides.

Bottom profile Aluminium bottom rail is provided with additional

rubber seal for tight closing for prevention of dust
entry.

Roller shaft Roller shaft shall be heavy duty mild steel strong
suspension tubular shaft without springs.

Side brackets M.S. plate 3 mm to 10 mm as per the opening

dimension.

Technical Specification, Section: Civil Works Page 55 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 Surface Finish & Painting Primer and Duco paint (Matt finish)

Operations Electrically operated with motor of suitable capacity

along with manual operation by hand chain or hand
crank for emergency

13.22 Circular/hexagonal M.S. sheet ceiling fan box shall be provided in the ceiling with clamp of
internal dia. 140 mm, 73 mm height, 3 mm thick rim, top and bottom lid of 1.5 mm M.S.
Sheet. Lids shall be screwed in to M. S. box by means of 3 mm round headed screws,
clamps shall be made of 12 mm dia. M. S. bar bent to shape as per standard drawing with
overall length as 80 cm.

13.23 Powder Coated (minimum thickness 50 micron) aluminium work for doors, windows,
ventilators and partitions shall be provided and fixed in building with extruded built up
standard tubular and other sections of approved make conforming to IS:733 and IS : 1285,
fixed with rawl plugs and screws or with fixing clips, or with expansion hold fasteners
including necessary filling up of gaps at junctions at top, bottom and sides with required
PVC/neoprene felt etc and joined mechanically wherever required including cleat angle,
Aluminium snap beading for glazing / panelling, C.P. brass/ stainless steel screws including
glazing and fittings as specified.

13.24 All doors except for toilet shall have 100mm 6 lever CP Brass mortice lock . Anodized
aluminum handles of ISI marked and approved size shall be provided for all doors and
windows as per requirement and instruction of E.I.C.

13.25 Cylindrical keyless lock of 25 mm diameter and 50mm diameter knob on both sides (ISI
marked) shall be provided for toilets.

13.26 Kitchen door shall have 250x16mm C.P. brass sliding door bolt.

13.27 Door shall be provided with anodized aluminum tower bolt (barrel type) 250x10mm
wherever door closers are not provided.

13.28 All windows shall have aluminum tower bolt (barrel type) 150x10mm as per requirement.

13.29 Double action hydraulic floor spring of approved brand and manufacture confirming to IS:
6315 having brand logo embossed on the body/plate with double spring mechanism and
door weight upto 125 kg, for doors shall be provided and fixed at the following door
including cost of cutting floors as required, embedding in floors and cover plates with brass
pivot and single piece MS sheet outer box with slide plate etc. as per the direction of
Engineer-in-charge. With stainless steel cover plate minimum 1.25 mm thickness.

Technical Specification, Section: Civil Works Page 56 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 a. Main Entrance to Control Room Building / Transit Camp
b. Control Room
13.30 Aluminium extruded section body tubular type universal hydraulic door closer (having
brand logo with ISI, IS : 3564, embossed on the body) with double speed adjustment with
necessary accessories and screws etc. complete

b. Substation In charge room.

c. Conference Room
d. bedroom and toilet doors of transit camp
e. Pantry and Kitchen

13.31 Plinth protection 50 mm thick of cement concrete 1:2:4 (1 cement : 2 fine aggregate : 4
graded stone) aggregate 20 mm nominal size) shall be laid over 75 mm bed of dry brick
ballast 40 mm nominal size well rammed and consolidated and shall be grouted with fine
sand including finishing the top smooth. Minimum width of plinth protection shall be 1000
mm.

13.32 G.S. corrugated sheets of 0.80 mm thick with zinc coating not less than 275 gm/m²
roofing shall be provided and fixed with G, I, J or L hooks, bolts and nuts 8mm diameter G, I
plain and bitumen washers complete excluding the cost of purlins, rafters and trusses for
water tank.

13.33 Cement Jali of (1:2:4) ( 1 Cement: 2 fine aggregate : 4 coarse aggregate ) 50mm thick, shall
be reinforced with 1.6mm dia with Mild steel wire including centering and shuttering
cleaning fixing and furnishing with cement mortar 1:3).

13.34 Ward Robes of required height and about 600 mm deep shall be made out of 18 mm. thk
anti termite treated commercial board ISI marked at end verticals, top and bottom,
shutters, partition etc complete. The rear side of the unit shall be made with 6mm thk
commercial ply ISI marked, which shall have French spirit polish on the exterior face. Inner
surface of the storage cabinet shall be finished with 0.8mm thk approved laminate. The
horizontal partition shall be of removable type fixed with necessary SS fittings and
hardware. All external surfaces shall be finished with 4.0 mm thk approved veneer with
melamine including making necessary grooves, teak wood moulding as per approved
drawings. Each shutter shall have piano type stainless steel hinges and C.P. Brass or SS
125mm long handle. The unit shall have necessary fittings such as tower bolts, 4 lever CB
locks etc complete.

13.35 Angles 50x50x6 mm (minimum) with lugs shall be provided for edge protection all round
cut outs/openings in floor slab.

Technical Specification, Section: Civil Works Page 57 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
13.36 Items/ components of buildings not explicitly covered in the specification but required for
completion of the project shall be deemed to be included in the scope.

14.0 EXTERNAL WATER SUPPLY FROM BORE-WELL TO FIRE WATER TANK/CONTROL BUILDING
AND / OR TRANSIT CAMP:

14.1 The drawing for the water supply from bore-well to fire water tank shall be developed by
the Contractor. Water supply will be made available to the Contractor from a bore-well by
the Employer at any one location within the sub-station. 80 mm dia CPVC pipe shall be
provided by the Contractor from the bore-well to the fire water tank. The underground
pipe line shall be laid as per CPWD Specification. The ball valve, NRV etc. shall be provided
as per requirement. From this pipe line a 25 mm dia tap off shall be connected by the
Contractor to the roof water tank provided for the control room building & transit camp.

14.2 The Contractor shall carry out all the external plumbing/erection works required for supply
of water to the control room building, firewater tank and/ or transit camp beyond the
single point as given at 14.1.

14.3 A scheme shall be prepared by the Contractor indicating the layout and details of water
supply which shall be got approved from the Employer before actual start of work
including all other incidental items not shown or specified but as may be required for
complete performance of the works.

14.4 Bore well is not in the scope of Contractor.

15.0 SUBMISSION:

The following information shall be submitted for review and approval to the Employer:

15.1 Editable Soft as well as hard copies of structural design calculations and structural
drawings (including construction/fabrication) for all reinforced concrete and structural
steel structures.

15.2 Fully, dimensioned concept plan including floor plans, cross sections, longitudinal sections,
elevations and perspective view of each building. These drawings shall identify the major
building components. Auto cad drawings shall also be submitted.

15.3 Fully dimensioned drawings showing details and sections drawn to scales of sufficient size
to clearly show sizes and configuration of the building components and the relationship

Technical Specification, Section: Civil Works Page 58 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 between them.

15.4 Product information of building components and materials, including walls partition
flooring ceiling, roofing, door and windows and building finishes to be submitted to EIC.

15.5 A door & window schedule showing door types and locations, door lock sets and latch sets
and other door hardware. Approval of the above information shall be obtained before
ordering materials or starting fabrication or construction as applicable.

16.0 MISCELLANEOUS REQUIREMENTS:

16.1 All joints including construction and expansion joints for the water retaining structures
(RCC tank for Fire Fighting and underground water tank) shall be made water tight by using
PVC ribbed water stops with central bulb. The minimum thickness of PVC water stops shall
be 5 mm and minimum width shall be 230 mm.

16.2 All mild steel parts used in the firefighting water tank and underground water tank shall be
hot-double dip galvanised. The minimum coating of the zinc shall be 750 gm/sq. m. for
galvanised structures and shall comply with IS:2628 and IS:2633. Galvanizing shall be
checked and tested in accordance with IS: 2633. The galvanizing shall be followed by the
application of an etching primer and dipping in black bitumen in accordance with BS: 3416.
The structural steel provided for roofing shall have enamel paint of approved shade two or
more coat to give even shade over steel primer.

16.3 Angles 50x50x6 mm (minimum) with lugs shall be provided for edge protection all round
cut outs/openings in floor slab.

16.4 For sump pit of switch yard Horizontal type submersible type pump as per BOQ rating
having level switch shall be provided.

16.5 The material specification, workmanship and acceptance criteria shall be as per approved
standard Field Quality Plan attached with this document which is available on POWERGRID
web site. In case certain item is not covered in FQP, it shall be constructed as per CPWD
specification.

16.6 Items/ components of buildings not explicitly covered in the specification but required for
completion of the project shall be deemed to be included in the scope.

16.7 CABLE TRANSIT SYSTEM

Modular multi-diameter cable sealing system consisting of frames, blocks and accessories
shall be installed where the underground and over ground cables enter or leave concrete
bay kiosks/switchyard panel room & control rooms in the substations. Cable transit system

Technical Specification, Section: Civil Works Page 59 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 shall consist of multi-diameter type peel-able/adjustable blocks of different sizes to suit
the various cables. It should be simple, easy and quick to assemble & re-assemble the
cable sealing system. Solid blocks shall not be used on frame. Frames & stay-plate material
shall be of galvanized steel and for compression single piece wedge with galvanized steel
bolts shall be used. 30% spare blocks of all sizes on the frame shall be provided for
expansion in future. Cable sealing system should have been tested for fire/water/smoke
tightness.

16.8 For communication Room GI Pipe of 40 mm dia shall be laid below floor to extend
communication cable coming from switchyard via ACDB/DCDB Room.

17.0 INTERFACING:

The proper coordination & execution of all interfacing civil works activities like fixing of
conduits in roofs/walls/floors, fixing of foundation bolts, fixing of lighting fixtures, fixing of
supports/embedment, provision of cut outs etc. shall be the sole responsibility of the
Contractor. He shall plan all such activities in advance and execute in such a manner that
interfacing activities do not become bottlenecks and dismantling, breakage etc. is reduced
to minimum.

18.0 STATUTORY RULES:

18.1 Contractor shall comply with all the applicable statutory rules pertaining to factories act
(as applicable for the State), Fire Safety Rules of Tariff Advisory Committee, Water Act for
pollution control etc.

18.2 Statutory clearance and norms of State Pollution Control Board shall be followed as per
Water Act for effluent quality from plant.

18.3 Requirement of sulphate resistant cement (SRC) for sub structural works shall be decided
in accordance with the Indian Standards based on the findings of the detailed soil
investigation. In case sulphate resistant cement is used as per requirement, differential
cost between sulphate resistant cement and PPC cement shall be payable as an extra item.

18.4 All building/construction materials shall conform to the best quality specified in CPWD
specifications if not otherwise mentioned in this specification.

18.5 All tests as required in the standard field quality plans have to be carried out without any
financial implication to employer.

Technical Specification, Section: Civil Works Page 60 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
19.0 SPECIFICATION FOR SITE LEVELLING WORK

19.1 SCOPE OF WORK AND GENERAL CONDITION

This specification shall apply to site levelling works as are required to be executed under
the Contract or otherwise directed by the Engineer-in-Charge. All testing shall be carried
out as per standard field quality plan of POWERGRID.

Site levelling work shall consist of clearance of site, excavation in all kinds of soils,
soft/disintegrated rock, hard rock, dewatering, transporting of excavated earth, filling,
consolidation of earth, levelling benching, giving slopes and making formations, levelling
operations, removal and satisfactory disposal of unsuitable materials necessary for
achieving desired formation level, if required, in accordance with the requirements of the
specifications and the lines, grades and cross-sections shown in the drawings or indicated
by the Engineer-in-Charge. The work shall include the hauling and stacking of or the
hauling to levelling site, of suitable materials as required, as also the disposal of unsuitable
materials in specified manner; and the trimming and finishing of works.

This work also includes cutting of diversion channel to prevent the area from flooding and
construction of kuchcha surface drains for drainage of the area.

The quality of work and materials shall comply with the requirements set forth in the
succeeding sections. Where the drawings and Specifications describe a portion of the
work only in general terms, and not in complete details, it shall be understood that only
the best general practice is to prevail, materials and workmanship of the best quality are
to be employed and the instructions of the Engineer-in-Charge are to be fully complied
with.
The work to be performed under this specifications consists of providing all labour,
supervision, materials, planking and strutting, power, fuel, construction equipments, tools
and plants, supplies, transportation, blasting materials if required, storage, insurance,
royalty and all incidental items not shown or specified by reasonably implied or necessary
for successful completion of work including contractor's supervision and in strict
accordance with drawing and specifications.

The scope may however vary based on the specific requirement of various works/site,
which shall be specified by the Owner.

The work shall be executed according to "Released for Construction", drawings with
additions, alterations and modifications made from time to time as required or approved
by the Engineer-in-Charge and also according to any other drawings that would be
supplied to the Contractor progressively during the execution of the Contract.

Technical Specification, Section: Civil Works Page 61 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 Construction traffic shall not use the levelled area without prior permission of the
Engineer-in-Charge. Any damage arising out of such use shall be made good by the
Contractor at his own expense.

The words like Contract, Contractor, Engineer-in-Charge, Drawings, Owner, works, site
used in this Specifications shall be considered to have the meaning as understood from the
definition of these terms included in the General Conditions of Contract.

19.2 PRESERVATION OF PROPERTY/AMENITY:

The Contractor shall undertake all reasonable precautions for the protection and
preservation of Trees, shrubs, any other plants, pole lines, fences, signs, monuments,
buildings, pipelines, sewers or other subsurface drains, pipes, conduits and any other
structures under or above ground, which may be affected by construction operations and
which in the opinion of the Engineer-in-Charge shall be continued in use without any
change.

The Contractor shall provide and install at his own expenses, suitable safeguards approved
by the Engineer-in-Charge for this purpose. However, if any of these objects is damaged by
reason of the Contractor's negligence, it shall be replaced or restored to the original
condition without any financial implication to POWERGRID.

19.3 DISPOSAL OF MATERIALS:

All materials arising from jungle clearing, grubbing operation, all type of excavation etc.
shall be the property of Power Grid and shall be disposed of by the Contractor as
hereinafter provided or directed by the Engineer-in-Charge within a lead of 2000 m
beyond the periphery of substation area. Also boulders, stones and other materials usable
shall be neatly stacked.

All products of clearing and grubbing which in the opinion of the Engineer-in-Charge
cannot be used or auctioned shall be cleared away to waste areas and burnt, if so desired,
at locations away to a lead mentioned above in a manner as directed. Care shall be taken
to see that unsuitable waste materials are disposed of in such a manner that there is no
likelihood of these getting mixed up with the materials meant for filling.

Where the excavated material is directed to be used in the filling area, it shall be directly
deposited at the required location complying with the total requirements. All disposed
material other than hard material shall be spread in layers at the places within specified
leads.

Technical Specification, Section: Civil Works Page 62 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 All hard materials, such as hard moorum, rubble, etc., not intended for use in the filling,
shall be stacked neatly on POWERGRID land as directed by the Engineer-in-Charge, for
future use.

Unsuitable and surplus materials not intended for use in any part of the works shall be
disposed off.

19.4 SITE CLEARANCE

The work shall consist of numbering of trees, removing and disposing of all materials such
as trees, bushes, woods, shrubs, grass, stumps, rubbish, rank vegetation, roots, foreign
materials, etc., which in the opinion of the Engineer-in-Charge are unsuitable for
incorporation in the works, from within the limits and areas as may be specified by the
Engineer-in-Charge.

All trees up to a girth (perimeter) of 30 cm measured at one metre above the ground level
shall also be cut and useful portion of the trees so cut shall be stacked at a suitable place
as directed by the Engineer-in-Charge and shall be considered incidental to clearing and
grubbing operations.

The roots of trees shall be dug up to 60 cm below the ground level or 15 cm below
formation level whichever is deeper and after removal of all vegetable and organic matter
from the holes so formed by removal of the roots, holes and hollows shall be filled with
good earth in layer of 20 cm, well rammed, consolidated and levelled.

The serviceable and unserviceable materials obtained from the site clearance shall be
removed from the area and disposed of to a place as per the directions of the Engineer-in-
Charge. All unserviceable and serviceable materials obtained from the site clearance shall
be the property of POWERGRID.

Clearing and grubbing item is not payable and the same shall be deemed to be included in
the earth work in excavation and filling.

Trees having girth above 30 cm are not in the scope of Contractor.

19.5 CLASSIFICATION OF EXCAVATED MATERIALS:

All materials involved in excavation shall be classified in the following groups:

19.5.1 ALL KIND OF SOILS AND SOFT/DISINTEGRATED ROCK

Technical Specification, Section: Civil Works Page 63 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 The material which can be quarried/excavated with pick, shovels, jumpers, scarifiers,
crowbars etc. and other mechanical implements. All materials involved under this
classification are as below:

All kind of soils includes various types of soils, plain concrete, shingle and river or nallah
bed boulders, soling of road, paths and hard core, macadam surface of any description,
stone masonry below the ground level, soft conglomerate and laterite stone which can be
detached from the matrix with picks and shovel.

Soft/disintegrated Rock (Not requiring blasting): Rock and boulders which may be quarried
and split with crow bars and other mechanical implements etc. It includes lime stone, sand
stone, hard conglomerate.

19.5.2 HARD ROCK:

All kind of rocks which can be excavated by machines and requires blasting chiselling in
edging or in another agreed method. This can be classified under the following categories:
a) Hard Rock (Requiring Blasting)-This shall comprise:

i) Any rock for the excavation of which the use of mechanical plant or blasting is
required;
ii) Reinforced cement concrete (reinforcement cut through but not separated from
the concrete) below ground; and
iii) Boulder requiring blasting.

b) Hard Rock (Blasting Prohibited)

Hard rock requiring blasting as described under (a) above but where blasting is prohibited
for any reason and excavation has to be carried out by chiselling, wedging or any other
agreed method.

19.5.3 AUTHORITY FOR CLASSIFICATION EXCAVATION:

The classification of excavation shall be decided by the Engineer-in-Charge and his decision
shall be final and binding on the Contractor. Merely the use of explosives in excavation
will not be considered as a reason for higher classification unless blasting is clearly
necessary in the opinion of the Engineer-in-Charge. All the excavated material shall be the
property of the POWERGRID.

19.6 SITE LEVELLING OPERATIONS:

19.6.1 SETTING OUT AND MARKING PROFILES.

After the site has been cleared, the limits of site levelling shall be set out true to lines,
curves, slopes, grades and sections as shown on the drawings or as directed by the

Technical Specification, Section: Civil Works Page 64 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 Engineer-in-Charge. The Contractor shall provide all labour, survey instruments and
materials such as strings, pegs, nails, bamboos, stones, lime, mortar, concrete, etc.,
required in connection with the setting out of works and establishment of bench marks. A
grid system of co-ordinates shall be established by the Contractor at the site. The
Contractor shall be responsible for the maintenance of permanent reference pillars, bench
marks and other marks and stakes as long as in the opinion of the Engineer-in-Charge they
are required for the work. All such marks/pillars shall be removed by the Contractor at his
own cost as soon as the purpose is over.

Masonry pillars shall be erected at suitable places in the area to serve as bench marks for
the execution of the work. These bench marks shall be connected with G.T.S. of any other
permanent bench mark approved by the Engineer-in-Charge. Necessary profiles with pegs,
bamboos and strings or "Burgeis" shall be made to show the correct formation levels
before the work is started and the same shall be approved by the Engineer-in-Charge. The
contractor shall supply all labour, tools, equipment, materials, safeguards and incidentals
necessary for setting out and making profiles and burgeis & pillars for the work at his own
cost. The profiles and burgeis shall be maintained during the execution of the work.

Marks/pillars shall invariably be diagonal unless otherwise directed, and should be such
that their average height is representative of average depths. Payments will be made on
the basis of volume measurement after with-holding the amount corresponding to 5% of
the volume of earth work on account of non-removal of marks/pillars.

The Contractor shall have to remove the marks/pillars and utilise the earth spoils as per
the directions of the Engineer-in-Charge. The withheld amount as stated in the above
paragraph may be paid after certification of the Engineer-in-Charge; regarding his full
satisfaction and to the effect that the mark/pillars, etc. have been removed and soils/earth
thereof has been utilised as directed by him.
If the contractor fails to remove, partly or fully the marks/pillars in the manner and within
the period as aforesaid double the amount spent by the owner for removal of
marks/pillars will be recovered from dues payable to the contractor.

19.6.2 EXCAVATION AND FILLING

All excavations shall be carried out in conformity with the directions laid herein under and
in a manner approved by the Engineer-in-Charge. The work shall be so done that the
suitable materials available from excavation are satisfactorily utilised as decided upon
before disposal.

While planning or executing excavation, the Contractor shall take all adequate precautions
against soil erosion, water pollution, air pollution etc.

Technical Specification, Section: Civil Works Page 65 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 The excavations shall conform to the lines, grades, side slopes and levels shown on the
drawings or directed with a negative tolerance of 100mm. The Contractor shall not
excavate outside the slopes or below the established grade or loosen any material outside
the limits of excavation. Subject to the permitted tolerances, any excess depth excavated
below the specified levels shall be made good at the cost of the Contractor with suitable
material of similar characteristics and compacted to the required density and to the
satisfaction of the Engineer-in-Charge.

All debris and loose material on the slopes of cuttings shall be removed.

Cutting shall be done from top to bottom. Under no circumstances undermining or

undercutting shall be allowed. Final surface shall be neatly dressed. The earth from
cutting shall be directly used for filling and no extra claim for double handling of earth shall
be admissible to the contractor.

If cutting be taken deeper, it shall be brought to the required level as per the instructions,
by filling it with the earth and duly consolidating at the Contractor's cost.

Filling shall be done in regular horizontal layers not exceeding 20 cm. in depth. The earth
shall be free from all roots, grass, rubbish and humps and clods exceeding 80mm in any
direction shall be broken. Each layer shall be consolidated by breaking clods and
Compacting each layer with wooden /steel rammer or movement of dozers, trucks or 8/10
tonne power road rollers, sheep foot roller and vibratory compactors etc. so that
compaction of 95% of the maximum dry density is achieved at optimum moisture content.
The surface finished shall be neatly dressed to the required formation levels with tolerance
of (±) 100 mm.

Tests for Compaction are to be performed as per the procedures laid down in the relevant
I.S. Codes of practice and Standard Field Quality Plan of POWERGRID. In cases of
compaction below the stipulated percentage, the contractor shall adopt proper techniques
as directed by the Engineer in-Charge and to his satisfaction to ensure the specified degree
of compaction. The cost of tests to be performed shall be borne by the Contractor.

During the execution of work, natural drainage of the area shall be maintained by the
contractor.

19.6.3 HARD ROCK EXCAVATION

Hard Rock, when encountered during excavation, shall be removed up to the finished
ground level or as indicated on the drawings. In all cases, the excavation operations shall
be so carried out that at no point on cut formation the rock protrudes above the specified
levels, provided, however, that a negative tolerance of 150 mm shall be permissible.

Technical Specification, Section: Civil Works Page 66 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 Slopes in rock cutting shall be finished to uniform lines corresponding to slope lines shown
on the drawings or as directed by the Engineer-in-Charge. Notwithstanding the foregoing,
all loose pieces of rock on excavated slope surface which move when prised by a crowbar
shall be removed.

Blasting shall be carried out as per relevant clause mentioned elsewhere in this
specification and all precautions indicated therein to be observed.

19.6.4 DEWATERING

If water is met with in the excavation due to stream flows, springs, seepage, rain or other
causes, it shall be removed by suitable diversions, pumping or bailing out and other
excavation kept dry whenever so required or directed by the Engineer-in-Charge, Care
shall be taken to so discharge the drained water as not to cause damage to the works,
crops or any other property. No extra payment shall be admissible to the contractor on
this account.

19.6.5 FINISHING OPERATIONS

Finishing operations shall include the work of properly shaping and dressing all excavated
surfaces. When completed, no point on the slopes shall vary from the designated slopes by
more than 150 mm measured at right angles to the slope, except where excavation is in
rock where no point shall vary more than 600 mm from the designated slope. In no case
shall any portion of the slope encroach on the road way.
19.7 EARTH FILL MATERIAL:

19.7.1 SUITABLE MATERIAL

The borrowed earth used in filling shall be free from all roots, grass, shrubs, rank
vegetation, brush wood, tree sapling and rubbish.

19.7.2 UNSUITABLE MATERIAL

Unsuitable material shall mean materials unsuitable for placing as fill in the works and shall
comprise:
a) Material from swamps, marshes and bogs;
b) Peat, logs, stumps and perishable materials;
c) Material susceptible to spontaneous combustion;
d) Any natural material or industrial and domestic produce which will adversely affect
other materials in the work;
e) Clay with liquid limit exceeding 80% and/or plasticity index exceeding 55%.

Technical Specification, Section: Civil Works Page 67 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
19.7.3 SPREADING AND COMPACTION OF FILLING

For the earth works contractor shall satisfy the Engineer-in-Charge that the entire specified
requirement regarding compaction can be achieved. Testing shall be carried out as per
standard field quality plan of POWERGRID.

The Final formation shall be correct in level and profile after compaction.

In the case of earth work consolidated under optimum moisture conditions, each layer of
earth shall be carefully moistened to give field moisture content of about + 1% to - 2% of
the optimum moisture content (OMC). The OMC shall be determined according to IS:
2720 (Pt.VII &VIII) Methods of Tests for Soils.

Each layer shall then be compacted by rolling with wooden/ steel rammer or movement
of dozers, trucks, 8/10 tonnes power road roller, sheep foot roller and vibratory
compactors/roller. The required amount of water shall be added during consolidation to
keep the moisture content of the soil at the optimum as per test. The density to be
achieved for each layer of the material shall not be less than 95% of the density obtained
in the laboratory (Proctor Method).

Control on compaction in the field shall be exercised through frequent moisture content
and density determinations. A systematic record of these shall be maintained. At all times
during construction the top of the embankment shall be maintained at such cross fall as
will shed water and prevent pounding.
19.8 BLASTING OPERATIONS.

19.8.1 GENERAL

Blasting shall be carried out only with the written permission of the Engineer-in-Charge.
All the statutory laws, regulations, rules, Indian Standards, etc., pertaining to the
acquisition, transport, storage, handling and use of explosives shall be strictly followed.
The Contractor may adopt any method or methods of blasting consistent with the safety
and job requirements, after approval from the Engineer-in-Charge and shall muffle the
blasting adequately to the satisfaction of the Engineer-in-Charge. Blasting should be
carried out as far as possible with the help of Ammonium Nitrate mixed with proper
proportions of fuel oil which is a safer method. However, in the event of its non-
availability the convenient practice of using gelatine with detonators can be resorted to.
The magazine for the storage of explosives shall be built to the designs and specifications
of the Explosives Department concerned and located at the approved site. No
unauthorised person shall be admitted into the magazine which when not in use shall be
kept securely locked. No matches or inflammable material shall be allowed in the

Technical Specification, Section: Civil Works Page 68 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 magazine. The magazine shall have an effective lightning conductor. The following shall
be hung in the lobby of the magazine.
a) A copy of the relevant rules regarding safe storage both in English and in the language
with which the workers concerned are familiar,
b) A statement of up to date stock in the magazine,
c) A certificate showing the last date of testing of the lightning conductor,
d) A notice that smoking is strictly prohibited.

In addition to these, the Contractor shall also observe the instructions in following clauses
and any further additional instructions which may be given by the Engineer-in-Charge and
shall be responsible for damage to property and any accident which may occur to
workmen or the public or the materials on account of any operations and blasting. The
Engineer-in-Charge shall frequently check the Contractor's compliance with these
precautions.

19.8.2 MATERIALS, TOOLS AND EQUIPMENT.

All the materials, tools and equipment used for blasting operations shall be of approved
type and shall be arranged by the contractor from any authorised dealer of such approved
material. Necessary assistance in the form of approval for procurement of the material
shall be given by the Corporation. The contractor shall be fully responsible for entering
into the agreement with any authorised magazine contractor in respect of rates, regularity
of supply, etc. the Engineer-in-Charge may specify the type of explosives to be allowed in
special cases. The fuse to be used in wet locations shall be sufficiently water-resistant as
to be unaffected when immersed in water for 30 minutes. The rate of burning of the fuse
shall be uniform and definitely known to permit such a safe length being cut as will permit
sufficient time to the firer to reach safety before explosion takes place. Detonators shall
be capable of giving effective blasting of the explosives. The blasting powder, explosives,
detonators fuses, etc., shall be fresh and not damaged due to damp, moisture or any other
cause. They shall be inspected before use and damaged articles shall be discarded totally
and removed immediately.

19.8.3 PERSONNEL

The blasting operation shall remain in the charge of competent and experienced
supervisor and workmen who are thoroughly acquainted with the details of handling
explosives and blasting operations.

19.8.4 BLASTING OPERATIONS.

The blasting shall be carried out during fixed hours of the day preferably during the mid-
day lunch hour or at the close of the work as ordered in writing by the Engineer-in-Charge.
The hours shall be made known to the people in the vicinity. All the charges shall be
Technical Specification, Section: Civil Works Page 69 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 prepared by the man in charge only. Proper precautions for safety of persons and
property shall be taken.

Red danger flags shall be displayed prominently in all directions during the blasting
operations. People, except those who actually light the fuse shall be prohibited from
entering this area. The flags shall be planted 200 metres from the blasting site in all
directions and all persons including workmen shall be excluded from the flagged area at
least 10 minutes before the firing, a warning whistle being sounded for the purpose.
The charge holes shall be drilled to required depths and in suitable places. Blasting should
be as light as possible consistent with thorough breakage of the material necessary for
economic loading and hauling. Any method of blasting which leads to overshooting shall
be discontinued.

When blasting is done with powder, the fuse cut to the required length shall be inserted
into the hole and the powder dropped in. The powder shall be gently tamped with copper
rods with rounded ends. The explosive powder shall then be covered with tamping
material which shall be tamped lightly but firmly.

At a time, not more than 10 such charges will be prepared and fired. The man in charge
shall blow a whistle in a recognised manner for cautioning the people. All the people shall
then be required to move to safe distances. The charges shall be lighted by the man in
charge only. The man in charge shall count the number of explosions. He shall satisfy
himself that all the charges have been exploded before allowing the workmen to go back
to the work site.
When blasting is to be carried out in the proximity of other existing structures, sand/earth
bags, etc. shall be used on the top of the blast holes to prevent the rock fragment from
causing damage to the structures.

However, when blasting is prohibited for any reasons the excavation shall be carried out
by chiselling, wedging or any other agreed method.

19.8.5 MISFIRE

In case of misfire, the following procedure shall be observed:

i) Sufficient time shall be allowed to account for the delayed blast. The man in charge
shall inspect all the charges and determine the missed charges.
ii) If it is the blasting powder charge it shall be completely flooded with water. A new
hole shall be drilled at about 45 cm. from the old hole and fired. This should blast the
old charge. Should it not blast the old, the procedure shall be repeated till the old
charge is blasted.
iii) If a misfire has been found to be due to defective detonator, the whole quantity in the
box from which defective article was taken must be sent to the authority directed by
the Engineer-in-Charge for inspection to ascertain whether all the remaining materials

Technical Specification, Section: Civil Works Page 70 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 in the box are also defective.

19.8.6 ACCOUNT.

A careful and day to day account of the explosives shall be maintained by the Contractor in
an approved register and manner which shall be open to inspection by the Engineer-in-
Charge at all times.

19.9 RECORDING OF MEASUREMENTS

The ground levels shall be taken at every 5 metres distance and at closer distances where
pits, undulations, etc. are met with. The ground level shall be recorded in field book,
plotted on plans and shall be signed by contractor and the Engineer-in-Charge before the
earth work is started.

The levels of the area after excavation shall be recorded in the field book duly signed by
the Engineer-in-Charge and contractor. The labour, materials, tools, equipment,
safeguards and incidentals required for taking levels shall be supplied by the contractor at
his own cost.

All measurements shall be made in the metric system. Different items of work shall be
measured in accordance with the procedures set forth in the relevant sections.

All measurements and computations, unless otherwise indicated, shall be carried nearest
to the following limits:
a) Length and breadth -- 10 mm
b) Height, depth or thickness of work -- 5 mm
c) Area -- two places of decimal
d) Cubical qty. -- two places of decimal

20.0 MODE OF MEASUREMENT

Mode of measurement for different items is given below, however, in case of any ambiguity
relevant part of IS: 1200 (latest) shall be referred.
20.1 EARTHWORK
This shall include excavation in all kinds of soil including rock, all leads and lifts including
back filling, compacting, dewatering (if required) and disposal of surplus earth/ rock to a
suitable location within a lead up to two km. Excavation or dismantling of lean concrete
shall be measured under this item. The quantity of excavation for foundations of towers,
equipment structures, all transformers, firewall, cable trenches, water tank, reactors,
buildings, marshalling kiosks, underground water tanks and covered car parking shall only
be measured. The quantity of excavation for roads, rail cum road, drains, culverts,
rainwater harvesting, septic tank, soak pit, external water supply system, site surfacing,

Technical Specification, Section: Civil Works Page 71 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 chain link fencing (including gate) shall not be measured separately and shall be deemed to
be included in the composite rates quoted by the bidder for the respective works. All
other excavation required for the completion of the work including fixing of lamp posts/
electric poles, plinth protection, flooring, sewerage system, manholes, pipes, earth mat,
pipe support etc. shall also not be paid for. The measurement of excavation for all
concrete works shall be made considering dimension of the pit keeping 150mm gap
around the base pad (lean concrete) or actually excavated pit, whichever is less. For hard
rock excavation, the volume of hard rock shall be computed on the basis of stacks of
excavated rubble after making 50% deduction for voids. The unit of measurement shall be
in cubic meter. The unit rate shall include stacking, disposal of excavated material for leads
up to 2000 meters beyond the levelling boundary.

The quantity shall be measured in cubic meters as per following details:

a) Excavation in all kind of soil including soft/ disintegrated rock, PCC, WBM, Brickwork/
stone masonry etc (excluding hard rock).

b) Excavation in hard rock (required blasting)

20.2 PLAIN CEMENT CONCRETE (PCC)

Providing and laying Plain Cement Concrete of all types and at all locations including all
leads and lifts. The quantity shall be measured in cubic meters as per lines and levels
indicated in the drawings.

20.2.1 PCC 1:2:4 (1 cement : 2 fine aggregate : 4 coarse aggregate 20 mm nominal size) shall be
measured in flooring of buildings, plinth protection, fencing, transformer foundation,
reactor foundation, rail track, drain, culverts, septic tank, chain link fencing, gate etc. as
indicated in the drawings.

20.2.2 PCC 1:3:6 (1 cement : 3 fine aggregate : 6 stone aggregate, 40mm nominal size) shall be
measured below all foundations including buildings, underground water tanks, covered
car parking cable trench, roads, under flooring, rail-cum-road, transformer foundation,
reactor foundation, drain, water tank, culverts, gate, tower/equipment etc. as indicated in
the drawings.

20.2.3 PCC 1:4:8 (1 cement : 4 fine aggregate : 8 stone aggregate, 40mm nominal size) shall be
measured below all foundations including buildings, underground water tanks, covered
car parking cable trench, roads, under flooring, rail-cum-road, transformer foundation,
reactor foundation, drain, water tank, culverts, gate, tower/equipment etc. as indicated in
the drawings.
20.2.4 PCC 1:5:10 (1 cement: 5 fine aggregate: 10 brick aggregate/ stone aggregate 40mm
nominal size) shall be provided for site surfacing in switchyard. This shall include providing
and laying cement slurry in case of site surfacing in switchyard.
Technical Specification, Section: Civil Works Page 72 of 80
C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 All other PCC required for the completion of the work including hold fasts of
doors/windows/rolling shutters, fixing of plumbing pipes, bedding concrete for sewer lines,
embedment of electrical conduits, water proofing of roof etc. shall not be measured and
deemed to be included in the composite rates quoted by the bidder for respective works.
Water proofing compound wherever specified shall be added without any extra cost.

20.3 RCC

Measurement of reinforced cement concrete at all locations shall be made and shall
include all leads, lifts, formwork, grouting of pockets and underpinning. This shall also
include pre-cast RCC work and addition of water proofing compound & admixtures
wherever required for which no additional payment shall be made. The quantity shall be
measured in cubic meters as per lines and levels indicated in the drawings. No deduction
shall be made for volume occupied by reinforcement/inserts/sleeves and for openings
having cross-sectional area up to 0.1 sq.m.

20.4 REINFORCEMENT STEEL

Reinforcement shall be measured in length (actual or theoretical as per drawing whichever

is less) including hooks, if any, separately for different diameters as actually used in work,
excluding overlaps. From the length so measured, the weight of reinforcement shall be
calculated in tons on the basis of sectional weights as adopted by Indian Standards.
Wastage, overlaps, couplings, welded joints, spacer bars, chairs, stays, hangers and
annealed steel wire or other methods for binding and placing shall not be measured and
cost of these items shall be deemed to be included in the rates for reinforcement.

20.5 STONE FILLING

Measurement of stone (40-60mm size) for transformer/ reactor foundations shall be made
as per theoretical volume of the space to be filled in the transformer foundation as per
drawings. This shall be measured in cu.m. no voids shall be deducted.

20.6 MISCELLANEOUS STRUCTURAL STEEL

Measurement for Supply, fabrication, transportation and erection of all miscellaneous
structural steel work for mono rails (RS joists), rails for transformers/ reactors, trusses,
frame work, purlins, gratings including factory made electro forged gratings, steel tubes,
built up sections along with all other steel fittings and fixtures, inserts and embedment in
concrete shall be made as per drawings. The unit rate for this item shall be inclusive of
cutting, grinding, drilling, bolting, welding, pre- heating of the welded joints, applying a
priming coat of steel primer / anti corrosive bitumastic paint/ synthetic enamel paint etc.
wherever specified ( For gratings and its supports epoxy zinc phosphate primmer shall be
used) setting of all types of embedment in concrete, etc. Steel required for foundation

Technical Specification, Section: Civil Works Page 73 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 bolts & fasteners (other than towers and equipment support structures), doors, windows,
ventilators, louvers, rolling shutters, chain link fencing, gratings in drains, soil pipes,
plumbing pipes, floor traps, embedment’s required for rainwater harvesting, septic tank,
soak pit, roof truss and purlins required for fire water tank, steel structures of PEB
buildings, etc. shall not be considered for payment and measurements. Quantity shall be
measured in MT.

20.7 ROADS

20.7.1 The measurement for the concrete road shall be made on the basis of area in square
meter (M2) of top concrete completed surface of the road and shall be deemed to include
all items such as earth work (excavation, disposal etc.), compaction, rolling, watering,
WBM, Kerb stone, grating, shoulder, 100mm dia RCC Hume pipe to be provided at every
100M etc where ever indicated complete as per drawing. Concreting all type and
reinforcement shall be measured and paid separately under relevant items mentioned else
where in this specification. Usage of WMM in place of WBM shall be done with approval of
employer without any additional financial implication.

20.7.2 The measurement of bituminous road shall be made on the basis of area in square meter
(M2), of the top bituminous completed surface of the road and shall include all items such
as earth work (excavation, disposal etc.), compaction, rolling, watering, WBM, Kerb stone,
grating, shoulder, 100mm dia RCC Hume pipe to be provided at every 100M etc where
ever indicated complete as per drawing including premix carpet etc complete .Usage of
WMM in place of WBM shall be done with approval of employer without any additional
financial implication.

20.7.3 Interlocking concrete tiles required to be provided on the shoulders of the road shall be
measured in square meter (M2) and paid separately under relevant item.

20.8 ANTIWEED TREATMENT

The measurement shall be done for the actual area in square metres of antiweed
treatment which will include supplying required chemicals and doing the treatment
complete in all respect as per the specification for the specified area.

20.9 STONE SPREADING IN SWITCHYARD

The measurement shall be done for the actual area in square meters of stone spreading in
the switchyard which will include supplying and laying of 100mm thickness of stone
aggregate as per specification for the specified area.

Technical Specification, Section: Civil Works Page 74 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
20.10 CHAIN LINK FENCING AND GATE
The measurement shall be made in running metres of the fence provided as per drawing.
The rate shall be inclusive of post, wire mesh, MS Flat etc. complete. All concrete shall be
measured and paid under relevant item. The gate shall be measured in numbers.

20.11 CABLE TRENCH CROSSING AND ROAD CULVERTS THROUGH HUME PIPES
Cable trench crossings and road culverts shall be measured by length (in running meters)
of individual Hume pipe which will be laid as per the drawings. The item shall be inclusive
of earth work (excavation, backfilling, disposal etc.), laying, back filling, jointing, brickwork,
plastering etc complete in all respect but excluding concrete (all type)which will be
measured and paid separately under respective items.

20.12 BUILDINGS:

20.12.1 RCC FRAMED STRUCTURE BUILDINGS:

Payment for item shall be made on plinth area basis. However, the quantity of earth work
(excavation, backfilling, disposal etc.), concrete (all type), reinforcement steel shall be
measured and paid as per relevant clauses as described above. The rest of the entire
work (including internal & external finishing), stone soling for flooring, plinth protection,
drain along plinth protection, electrical conduit & junction boxes, fan boxes, cable transit
system etc. required to complete the building in all respect as per the drawings furnished
by the Employer shall be deemed to be included in the plinth area rate. Plinth area shall
be calculated based on IS 3861-2002.

20.12.2 PRE-ENGINEERED STEEL BUILDINGS:

a) GIS HALL
b) AHU & RELAY ROOM

The quantity of earth work (excavation, backfilling, disposal etc.), concrete (all type),
reinforcement steel shall be measured & paid separately as per relevant clauses as
described above. Plinth area shall be calculated based on IS 3861-2002. However,
payment for remaining finishing items a), b) & c) shall be made on plinth area basis for
each building including internal foundations, cable trenches, internal & external finishes,
stone soling for flooring, plinth protection, drain along plinth protection, electrical
conduit & junction boxes, fan boxes, cable transit system, miscellaneous structural steel
required for seating of GIS equipments, cable supports in cable trenches, chequered
plates etc inside GIS building. complete in all respect.

20.12.3 EXTENSION OF RCC /PEB BUILDINGS:

a) CONTROL ROOM BUILDING

Technical Specification, Section: Civil Works Page 75 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 b) GIS HALL
c) AHU & RELAY ROOM

The quantity of earth work (excavation, backfilling, disposal etc.), concrete (all type),
reinforcement shall be measured and paid as per relevant clauses as described above.
Plinth area shall be calculated based on IS 3861-2002. However, payment for above items
a), b) & c) shall be made on plinth area basis for each building including internal
foundations, cable trenches, internal & external finishes, stone soling for flooring, plinth
protection, drain along plinth protection, electrical conduit & junction boxes, fan boxes,
cable transit system wall dismantling works, miscellaneous structural steel required for
seating of GIS equipments, cable supports in cable trenches, chequered plates etc inside
GIS building complete in all respect.

20.12.4 INTERNAL ELECTRIFICATION AND FIRE FIGHTING:

Payment for internal electrification as well as internal firefighting works is not included in
items covered in clauses above and shall be paid as per relevant clauses and BPS.
However, conduit, junction boxes, surface boxes for electrification, cable transit system is
deemed to be included in the building items.

20.13 RAIN WATER HARVESTING

This is a lump sum item. The Contractor shall be required to complete the work in all
respect as per drawings furnished by the Employer. All the items including earth work
(excavation, backfilling, disposal etc.), miscellaneous steel, brick work, fillings of boulders,
gravel, sand, pipes etc. shall be deemed to be included in this lump sum rate. However,
the concrete (all types) and the reinforcement shall be measured and paid under the
relevant clauses as mentioned above.

20.14 RAIL CUM ROAD

The measurement for the rail cum road shall be made in square metres of top concrete
completed surface of the rail cum road and shall include all items such as earth work
(excavation, backfilling, disposal etc.), compaction, rolling, watering, WBM etc. complete
as per drawing but excluding concrete (all type), reinforcement, structural steel and rails.
Usage of WMM in place of WBM shall be done with approval of employer without any
additional financial implication.

20.15 SEPTIC TANK AND SOAK PIT

This is a lump sum item. The Contractor shall be required to complete the work in all
respect as per drawings furnished by the Employer. All the clause including earth work

Technical Specification, Section: Civil Works Page 76 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 (excavation, backfilling, disposal etc.), masonry work, all types of fillings, all types of pipes
including plumbing and vent pipes, all type of fittings etc. shall be deemed to be included
in this lump sum rate. However, the concrete (all types) and the reinforcement shall be
measured and paid under the relevant clauses mentioned above.

20.16 FIRE WATER TANK

This is a lump sum item. The Contractor shall be required to complete the work in all
respect as per drawings furnished by the Employer. All the items including, compaction,
brick work, roof truss, purlins, roofing, all types of miscellaneous steel, internal and
external plastering, painting etc. shall be deemed to be included in this lump sum cost.
However, concrete (all types) and reinforcement shall be measured and paid under the
relevant clauses as mentioned above.

20.17 EXTERNAL WATER SUPPLY FROM BORE-WELL TO FIRE WATER TANK, CONTROL ROOM
BUILDING AND TRANSIT CAMP:

The external water supply from Bore-well shall be measured in running meters of pipe of
various diameters. It shall include all the items such as earth work (excavation,
backfilling, disposal etc.), piping, pipe fittings, painting, brickwork, sand filling, concrete,
valves, chambers cutting chases in walls, openings in RCC and repairs, etc. required to
complete the job.

20.18 EXTERNAL SEWERAGE :

Sewage System of the shall be measured diameter wise in running meters. It shall
include all the items such as earth work (excavation, backfilling, disposal etc.), piping,
pipe fittings, manholes, gully trap, gully chamber, encasing in concrete and repairs etc
required to complete the job. Any modification in the existing sewage system, if required,
shall be done by the Contractor without any financial implication to Employer.

20.19 CABLE TRENCHES:

Various items like earth work (excavation, backfilling, disposal etc.), concrete (all type),
reinforcement steel and miscellaneous steel required for construction of cable trenches
shall be measured and paid under respective clauses mentioned above.

20.20 DRAINS:

The item Concrete (all type) & Reinforcement for drains shall be measured under
relevant clauses as mentioned above. All other items required for completion of drains

Technical Specification, Section: Civil Works Page 77 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 shall be deemed to be included in the rate of items quoted for the drain. The quantity for
each type of drain section shall be measured in meters along the centre line of drain.

20.21 SOIL TREATMENT :

CNS or sand filling or boulder packing with interstices filled with sand under or sides of
the foundations, roads, cable trenches, drains etc shall be measured in cubic meters.

20.22 PILE FOUNDATION:

20.22.1 For payment purpose pile of different diameter shall be measured separately in length
(running meter) from bottom of pile cap to the lowest point of pile. The rate shall include
boring, providing and installation including temporary casing as applicable etc. complete
in all respect except for concrete and reinforcement steel which will be paid separately
under relevant items of BPS. Initial and routine test for vertical load and lateral load shall
be payable under respective items of BPS.

20.22.2 In case pile foundation is not envisaged originally in the LOA then concrete and
reinforcement steel shall be measured and paid as per items mentioned under relevant
clauses as mentioned above. Boring installation including temporary casing, bentonite
treatment, initial and routine tests etc of pile will be paid as an extra item. In case extra
quantity of cement is required to meet the provisions of IS: 2911, it will be paid as an
extra item.

20.23 CONTRACTOR DESIGNED FOUNDATIONS: Contractor designed foundations shall be

measured {quantity of earth work (excavation, backfilling, disposal etc.), PCC, RCC,
reinforcement} and paid as per relevant clauses as mentioned above, unless otherwise
specified.

20.24 Billing break up of Lump sum items for payment purpose shall be decided at site by
Engineer in charge for the work.

20.25 Civil works for Pipe supports and deluge valve housing for firefighting shall be deemed to
be included in the items for firefighting and shall not be paid under civil works.

20.26 BOUNDARY WALL:

The measurements of boundary wall shall be in running meter of finished work. The rate
shall be inclusive of earth work (excavation, backfilling, disposal etc.), concrete (all type),
Reinforcement, MS steel, brick masonry, plastering barbed wire/ concertina coil, painting
etc. complete required for completion of boundary wall. Nothing extra shall be payable
on this account.

Technical Specification, Section: Civil Works Page 78 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
20.27 SITE LEVELLING:

20.27.1 EARTH WORK IN EXCAVATION AND FILLING

The quantity of excavation in all types of soil and soft/disintegrated rock shall be worked
out by using initial and final levels. No void deduction shall be made to calculate net
quantity of earth work. Only Excavation/cutting will be measured for payment purpose.
The unit of measurement shall be in cubic metre.

In case hard rock is encountered during excavation, the level of rock surface before start
and completion of rock excavation shall be recorded for calculating the quantity of
excavation of hard rock. The volume of hard rock shall be computed on the basis of stacks
of excavated rubble after making 50 % deduction for voids. The item of excavation in hard
rock shall be payable separately.
The quantity of earth work in excavation in all kinds of soil & soft/disintegrated rock shall
be arrived by reducing quantity of hard rock from the gross excavated quantity.

The unit rate shall include all lifts and all leads within levelling boundary. It also includes
disposal of surplus earth and stacking of unusable material up the lead of2000 meters
beyond the levelling boundary. Rate of item shall include all operations specified in the
respective clause of technical specification.

20.27.2 EARTH WORKS IN EXCAVATION IN ALL TYPES OF SOILS AND SOFT /DISINTEGRATED
ROCKS, HARD ROCKS AND DISPOSAL.

Quantity of excavation in all type of soils and soft/disintegrated rocks shall be worked out
based on initial level before start of excavation and final levels after excavation. No void
deduction shall be made to calculate net quantity of earth work in excavation. The
excavated soil and soft/disintegrated rock shall be used for filling in lower areas of the
substation. The unit rate shall include disposal of excavated material for leads up to 1000
meters beyond the levelling boundary.
For hard rock excavation, the volume of hard rock shall be computed on the basis of stacks
of excavated rubble after making 50% deduction for voids. The unit of measurement shall
be in cubic meter. The unit rate shall include stacking, disposal of excavated material for
leads up to 2000 meters beyond the levelling boundary.

Where soil, soft/disintegrated rock and hard rock are mixed, the quantity of earth work in
excavation in all kinds of soil & soft/disintegrated rock shall be arrived by reducing
quantity of hard rock from the gross excavated quantity. Rate of item shall include all
operations specified in the respective clause of technical specification.

Technical Specification, Section: Civil Works Page 79 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
20.27.3 FILLING USING EARTH BORROWED FROM OUTSIDE THE SUBSTATION LAND

For borrowed earth, the measurement shall be based on levels of area under filling only.
The quantity of earth shall be worked out based on initial and final levels of levelling area.
No void deduction shall be made to calculate net quantity of earth work. The unit of
measurement shall be in cubic meter. The rate shall include arrangement of borrow area,
payment of royalty, transportation, laying compaction, all leads and lifts etc. Rate of item
shall include all operations specified in the respective clause of technical specification.

Technical Specification, Section: Civil Works Page 80 of 80

C/ENGG/SPEC/CIVIL/ Rev-11A/Jun’18
 SECTION: CONTROL, RELAY & PROTECTION PANELS

1. TYPE OF PANELS
1.1 Simplex Panel
Simplex panel shall consist of a vertical front panel with equipment
mounted thereon and having wiring access from rear for control panels &
front for relay/protection/Interface panels. In case of panel having width
more than 800mm, double leaf-doors shall be provided. Doors shall have
handles with built-in locking facility.
1.2 Duplex Panel
Duplex panel shall be walk-in tunnel type comprising two vertical front and
rear panel sections connected back-on-back by formed sheet steel roof tie
members and a central corridor in between. The corridor shall facilitate
access to internal wiring and external cable connections. In case of
number of duplex panels located in a row side by side, the central corridor
shall be aligned to form a continuous passage. Both ends of the corridor
shall be provided with double leaf doors with lift off hinges. Doors shall
have handles with built-in locking facility. Separate cable entries shall be
provided for the front and rear panels. However, inter-connections
between front and back panels shall be by means of inter panel wiring at
the top of the panel.
2. CONSTRUCTIONAL FEATURES
2.1. Control and Relay Board shall be simplex type unless otherwise
indicated in section-project / bill of quantity as duplex type. It is the
responsibility of the Contractor to ensure that the equipment specified and
such unspecified complementary equipment required for completeness of
the protective/control schemes be properly accommodated in the panels
without congestion and if necessary, either more number of panels or
panels with larger dimensions shall be provided (as per panel layout
requirement). No price increase at a later date on this account shall be
allowed. However, the width of panels that are being offered to be placed
in existing switchyard control rooms, should be in conformity with the
space availability in the control room.
2.2. Panels shall be completely metal enclosed and shall be dust, moisture and
vermin proof. The enclosure shall provide a degree of protection not less
than IP-31 in accordance with IS: 2147.
2.3. Panels shall be free standing, floor mounting type and shall comprise
structural frames completely enclosed with specially selected smooth
finished, cold rolled sheet steel of thickness not less than 3 mm for weight
bearing members of the panels such as base frame, front sheet and door
frames, and 2.0mm for sides, door, top and bottom portions. There shall
be sufficient reinforcement to provide level transportation and installation.
2.4. All doors, removable covers of panels shall be gasketed all around with
synthetic gaskets Neoprene/EPDM generally conforming with provision of

Tech Specification, Section: CRP Page 1 of 49

C/ENGG/SPEC/CRP REV NO: 09
 IS 11149. However, XLPE gaskets can also be used for fixing protective
glass doors. Ventilating louvers, if provided shall have screens and filters.
The screens shall be made of either brass or GI wire mesh.

2.5. Design, materials selection and workmanship shall be such as to result in

neat appearance, inside and outside with no welds, rivets or bolt head
apparent from outside, with all exterior surfaces tune and smooth.
2.6. Panels shall have base frame with smooth bearing surface, which shall be
fixed on the embedded foundation channels/insert plates. Anti vibration
strips made of shock absorbing materials that shall be supplied by the
contractor, which shall be placed between panel & base frame.
2.7. Cable entries to the panels shall be from the bottom. Cable gland plate
fitted on the bottom of the panel shall be connected to earthing of the
panel/station through a flexible braided copper conductor rigidly.
2.8. Relay/protection panels of modern modular construction meeting the
functional requirement would also be acceptable.
3. MOUNTING
3.1. All equipment on and in panels shall be mounted and completely wired to
the terminal blocks ready for external connections. The equipment on
front of panel shall be mounted flush.
3.2. Equipment shall be mounted such that removal and replacement can be
accomplished individually without interruption of service to adjacent
devices and are readily accessible without use of special tools. Terminal
marking on the equipment shall be clearly visible.
3.3. The Contractor shall carry out cut out, mounting and wiring of the free
issue items supplied by others which are to be mounted in his panel in
accordance with the corresponding equipment manufacturer's drawings.
Cut outs if any, provided for future mounting of equipment shall be
properly blanked off with blanking plate.
3.4. The centre lines of switches, push buttons and indicating lamps shall be
preferably not less than 750mm from the bottom of the panel. The centre
lines of relays, meters and recorders shall be preferably not less than
450mm from the bottom of the panel.
3.5. The centre lines of switches, push buttons and indicating lamps shall be
matched to give a neat and uniform appearance. Like wise the top lines of
all meters, relays and recorders etc. shall be matched.
3.6. No equipment shall be mounted on the doors.
3.7. At existing station, panels shall be matched with other panels in the control
room in respect of dimensions, colour, appearance and arrangement of
equipment (centre lines of switches, push buttons and other equipment) on
the front of the panel.

4. PANEL INTERNAL WIRING

Tech Specification, Section: CRP Page 2 of 49

C/ENGG/SPEC/CRP REV NO: 09
4.1. Panels shall be supplied complete with interconnecting wiring provided
between all electrical devices mounted and wired in the panels and
between the devices and terminal blocks for the devices to be connected
to equipment outside the panels. When panels are arranged to be located
adjacent to each other all inter panel wiring and connections between the
panels shall be carried out internally.
4.2. All wiring shall be carried out with 650V grade, single core, stranded
copper conductor wires with PVC insulation. The minimum size of the
multi-stranded copper conductor used for internal wiring shall be as
follows:

All circuits except current transformer circuits and voltage transformer
circuits meant for energy metering - one 1.5mm sq. per lead.

All current transformer circuits - one 2.5 sq.mm per lead.

Voltage transformer circuit (for energy meters): Two 2.5 mm sq. per
lead.
4.3. All internal wiring including FO patch cords shall be securely supported,
neatly arranged, readily accessible and connected to equipment terminals
and terminal blocks. Wiring gutters & troughs shall be used for this
purpose.
4.4. Void
4.5. Wire termination shall be made with solderless crimping type and tinned
copper lugs, which firmly grip the conductor. Insulated sleeves shall be
provided at all the wire terminations. Core identification plastic ferrules
marked to correspond with panel wiring diagram shall be fitted at both
ends of each wire. Ferrules shall fit tightly on the wire and shall not fall off
when the wire is disconnected from terminal blocks. All wires directly
connected to trip circuit breaker or device shall be distinguished by the
addition of red coloured unlettered ferrule.
4.6. Longitudinal troughs extending throughout the full length of the panel shall
be preferred for inter panel wiring. Inter-connections to adjacent panel
shall be brought out to a separate set of terminal blocks located near the
slots of holes meant for taking the inter-connecting wires. Wiring
termination at interface panel end shall be through prefabricated
plug-in type connectors.
4.7. Contractor shall be solely responsible for the completeness and
correctness of the internal wiring and for the proper functioning of the
connected equipments.

5. TERMINAL BLOCKS
5.1. All internal wiring to be connected to external equipment shall terminate on
terminal blocks. Terminal blocks shall be 650 V grade and have 10 Amps.
Continuous rating, moulded piece, complete with insulated barriers, stud
type terminals, washers, nuts and lock nuts. Markings on the terminal
blocks shall correspond to wire number and terminal numbers on the
wiring diagrams. All terminal blocks shall have shrouding with transparent

Tech Specification, Section: CRP Page 3 of 49

C/ENGG/SPEC/CRP REV NO: 09
 unbreakable material.
5.2. Disconnecting type terminal blocks for current transformer and voltage
transformer secondary leads shall be provided. Also current transformer
secondary leads shall be provided with short circuiting and earthing
facilities.
5.3. At least 20% spare terminals shall be provided on each panel and these
spare terminals shall be uniformly distributed on all terminal blocks.
5.4. Unless otherwise specified, terminal blocks shall be suitable for connecting
the following conductors of external cable on each side
• All CT & PT circuits: minimum of two no. of 2.5mm Sq. copper.
• AC/DC Power Supply Circuits: two no. of 16mm Sq. Aluminium.
• All other circuits: minimum of one no. of 2.5mm Sq. Copper.
5.5. There shall be an approximate clearance of 250mm between the first row
of terminal blocks and the associated cable gland plate or panel side wall.
Similarly the clearance between two rows of terminal blocks edges shall
be of 150mm approximate.
5.6. Arrangement of the terminal block assemblies and the wiring channel
within the enclosure shall be such that a row of terminal blocks is run in
parallel and close proximity along each side of the wiring-duct to provide
for convenient attachment of internal panel wiring. The side of the terminal
block opposite the wiring duct shall be reserved for the external cable
connections. All adjacent terminal blocks shall also share this field wiring
corridor. All wiring shall be provided with adequate support inside the
panels to hold them firmly and to enable free and flexible termination
without causing strain on terminals.
5.7. The number and sizes of the Owner's multi core incoming external cables
will be furnished to the Contractor after placement of the order. All
necessary cable terminating accessories such as gland plates, supporting
clamps & brackets, wiring troughs and gutters etc. (except glands & lugs)
for external cables shall be included in the scope of supply. Terminal
blocks provided on Interface panel used for external wiring from
switchyard shall be provided with necessary surge protection device
to safeguard IEDs from transient voltage surges, spikes.

6. PAINTING
The painting shall be carried out as detailed in Section–GTR.
7. MIMIC DIAGRAM (FOR CONTROL PANELS)
7.1. Coloured mimic diagram and symbols showing the exact representation of
the system shall be provided in the front of control panels.
7.2. Mimic diagram shall be made preferably of anodised aluminium or plastic
of approved fast colour material, which shall be screwed on to the panel
and can be easily cleaned. The mimic bus shall be 2mm thick. The width
of the mimic bus shall be 10mm for bus bars and 7mm for other

Tech Specification, Section: CRP Page 4 of 49

C/ENGG/SPEC/CRP REV NO: 09
 connections. Painted overlaid mimic is also acceptable.
7.3. Mimic bus colour will be decided during detailed Engineering by the
EMPLOYER.
7.4. When semaphore indicators are used for equipment position, they shall be
so mounted in the mimic that the equipment in close position shall
complete the continuity of mimic.
7.5. Indicating lamp, one for each phase, for each bus shall be provided on the
mimic to indicate bus charged condition
8. NAME PLATES AND MARKINGS
8.1. All equipment mounted on front and rear side as well as equipment
mounted inside the panels shall be provided with individual name plates
with equipment designation engraved. Also on the top of each panel on
front as well as rear side, large and bold nameplates shall be provided for
circuit/feeder designation.
8.2. All front mounted equipment shall also be provided at the rear with
individual name plates engraved with tag numbers corresponding to the
one shown in the panel internal wiring to facilitate easy tracing of the
wiring.
8.3. Each instrument and meter shall be prominently marked with the quantity
measured e.g. kV, A, MW, etc. All relays and other devices shall be
clearly marked with manufacturer's name, manufacturer's type and
electrical rating data.
8.4. Name Plates shall be made of non-rusting metal or 3 ply lamicoid. Name
plates shall be black with white engraving lettering.
8.5. Each switch shall bear clear inscription identifying its function e.g.
'BREAKER' '52A', "SYNCHRONISING" etc. Similar inscription shall also
be provided on each device whose function is not other-wise identified. If
any switch device does not bear this inscription separate name plate
giving its function shall be provided for it. Switch shall also have clear
inscription for each position indication e.g. "Trip- Neutral-Close", "ON-
OFF", "R-Y-B-OFF" etc
8.6. All the panels shall be provided with name plate mounted inside the panel
bearing LOA No & Date, Name of the Substation & feeder and reference
drawing number.
9. MISCELLANEOUS ACCESSORIES
9.1. Plug Point: 240V, Single phase 50Hz, AC socket with switch suitable to
accept 5 Amps and 15 Amps pin round standard Indian plug, shall be
provided in the interior of each cubicle with ON-OFF switch.
9.2. Interior Lighting: Each panel shall be provided with a LED type lighting
fixture (Min 7 Watt) rated for 240 Volts, single phase, 50 Hz supply for the
interior illumination of the panel controlled by the respective panel door
switch. Adequate lighting shall also be provided for the corridor in Duplex
panels.
9.3. Switches and Fuses: Each panel shall be provided with necessary

Tech Specification, Section: CRP Page 5 of 49

C/ENGG/SPEC/CRP REV NO: 09
 arrangements for receiving, distributing and isolating of DC and AC
supplies for various control, signaling, lighting and space heater circuits.
The incoming and sub-circuits shall be separately provided with Fuses.
Selection of the main and sub-circuit Fuses rating shall be such as to
ensure selective clearance of sub-circuit faults. Voltage transformer
circuits for relaying and metering shall be protected by fuses. All fuses
shall be HRC cartridge type conforming to IS: 13703 mounted on plug-in
type fuse bases. The short time fuse rating of Fuses shall be not less than
9 KA. Fuse carrier base shall have imprints of the fuse 'rating' and
'voltage'.
9.4. Space Heater: Each panel shall be provided with a thermostatically
controlled space heater rated for 240V, single phase, 50 Hz AC supply
for the internal heating of the panel to prevent condensation of moisture.
The fittings shall be complete with switch unit.
10. EARTHING
10.1. All panels shall be equipped with an earth bus securely fixed. Location of
earth bus shall ensure no radiation interference from earth systems under
various switching conditions of isolators and breakers. The material and
the sizes of the bus bar shall be at least 25 X 6 sq.mm copper with
threaded holes at a gap of 50 mm with provision of bolts and nuts for
connection with cable armours and mounted equipment etc for effective
earthing. When several panels are mounted adjoining each other, the
earth bus shall be made continuous and necessary connectors and
clamps for this purpose shall be included in the scope of supply of
Contractor. Provision shall be made for extending the earth bus bars to
future adjoining panels on either side.
10.2. Provision shall be made on each bus bar of the end panels for connecting
Substation earthing grid. Necessary terminal clamps and connectors for
this purpose shall be included in the scope of supply of Contractor.
10.3. All metallic cases of relays, instruments and other panel mounted
equipment including gland plate, shall be connected to the earth bus by
copper wires of size not less than 2.5 sq. mm. The colour code of
earthing wires shall be green.
10.4. Looping of earth connections which would result in loss of earth
connection to other devices when the loop is broken, shall not be
permitted. However, looping of earth connections between equipment to
provide alternative paths to earth bus shall be provided.
10.5. VT and CT secondary neutral or common lead shall be earthed at one
place only at the terminal blocks where they enter the panel. Such
earthing shall be made through links so that earthing may be removed
from one group without disturbing continuity of earthing system for other
groups.
10.6. An electrostatic discharge arrangement shall be provided in each panel
so as to discharge human body before he handles the equipments inside
the panels.
11. INDICATING INSTRUMENTS & TRANSDUCERS FOR CONTROL

Tech Specification, Section: CRP Page 6 of 49

C/ENGG/SPEC/CRP REV NO: 09
 PANEL:
All instruments, meters and transducers shall be enclosed in dust proof,
moisture resistant, black finished cases and shall be suitable for tropical
use. All Megawatt, Megavar, voltage and frequency indicating
instruments shall be provided with individual transducers and these shall
be calibrated along with transducers to read directly the primary
quantities. They shall be accurately adjusted and calibrated at works and
shall have means of calibration check and adjustment at site. The
supplier shall submit calibration certificates at the time of delivery.
However no separate transducers are envisaged for digital bus
voltmeters and digital frequency meters and the indicating meters
provided in the synchronising equipment.
11.1. Indicating Instruments
11.1.1. Unless otherwise specified, all electrical indicating instruments shall be
of digital type suitable for flush mounting.
11.1.2. Instruments shall have 4-digit display; display height being not less than
25 mm.
11.1.3. Instrument shall confirm to relevant IS and shall have an accuracy class
of 1.5 or better. Watt and Var meters shall have an indication of (+) and
(-) to indicate EXPORT and IMPORT respectively.
11.1.4. Digital voltage and frequency meters shall be of class: 0.5 and shall have
digital display of 4 and 4.5 digits respectively, with display size, not less
than 25mm (height).
11.2. Transducers
11.2.1. Transducers (for use with Indicating Instruments and Telemetry/Data
Communication application) shall in general conform to IEC:60688-1.
11.2.2. The transducers shall be suitable for measurement of active power,
reactive power, voltage, current and frequency in three phase four wire
unbalanced system.
11.2.3. The input to the transducers will be from sub-station current & potential
transformers. The output shall be in milli ampere D.C. proportional to the
input & it shall be possible to feed the output current directly to the
telemetry terminal or indicating instruments.
11.2.4. The transducer characteristic shall be linear throughout the measuring
range.
11.2.5. The transducer output shall be load independent.
11.2.6. The input & output of the transducer shall be galvanically isolated.
11.2.7. Each transducer shall be housed in a separate compact case and have
suitable terminals for inputs & outputs.
11.2.8. The transducers shall be suitably protected against transient high peaks
of voltage & current.
11.2.9. The transducer shall withstand indefinitely without damage and work
satisfactorily at 120% of the rated voltage and 120% of the rated input

Tech Specification, Section: CRP Page 7 of 49

C/ENGG/SPEC/CRP REV NO: 09
 current as applicable.
11.2.10. All the transducers shall have an output of 4-20 mA.
11.2.11. The response time of the transducers shall be less than 1 second.
11.2.12. The accuracy class of transducers shall be 1.0 or better for
voltage/current transducer, 0.5 or better for watt/VAR transducer and 0.2
or better for frequency transducer.
11.2.13. The transducers shall have a low AC ripple on output less than 1%.
11.2.14. The transducer shall have dual output.
12. ANNUNCIATION SYSTEM for Control Panel
12.1. Alarm annunciation system shall be provided in the control board by
means of visual and audible alarm in order to draw the attention of the
operator to the abnormal operating conditions or the operation of some
protective devices. The annunciation equipment shall be suitable for
operation on the voltages specified in this specification.
12.2. The visual annunciation shall be provided by annunciation facia,
mounted flush on the top of the control panels.
12.3. The annunciation facia shall be provided with translucent plastic window
for alarm point with approximate size of 35mm x 50mm. The facia plates
shall be engraved in black lettering with respective inscriptions. Alarm
inscriptions shall be engraved on each window in not more than three
lines and size of the lettering shall not be less than 5 mm.
12.4. Each annunciation window shall be provided with two white lamps in
parallel to provide safety against lamp failure. Long life lamps shall be
used. The transparency of cover plates and wattage of the lamps
provided in the facia windows shall be adequate to ensure clear visibility
of the inscriptions in the control room having high illumination intensity
(350 Lux), from the location of the operator's desk.
12.5. All Trip facia shall have red colour and all Non-trip facia shall have white
colour.
12.6. The audible alarm shall be provided by Buzzer/ Hooter /Bell having
different sounds and shall be used as follows.
Hooter Alarm Annunciation
Bell Annunciation DC failure
Buzzer AC supply failure
12.7. Sequence of operation of the annunciator shall be as follows :

Sl. Alarm Condition Fault Visual Audible

NO. Contact Annunciation Annunciation
1. Normal Open OFF OFF
2. Abnormal Close Flashing ON
3. Accept Push Close Steady On OFF

Tech Specification, Section: CRP Page 8 of 49

C/ENGG/SPEC/CRP REV NO: 09
 Button Pressed
Open Steady On OFF
4. Reset Push Button Close On OFF
Pressed
Open Off OFF
5. Lamp Test Push Open Steady On OFF
Button Pressed
12.8. Audible annunciation for the failure of DC supply to the annunciation
system shall be provided and this annunciation shall operate on 240
Volts AC supply. On failure of the DC to the annunciation system for
more than 2 or 3 seconds (adjustable setting), a bell shall sound. A
separate push button shall be provided for the cancellation of this audible
alarm alone but the facia window shall remain steadily lighted till the
supply to annunciation system is restored.
12.9. A separate voltage check relay shall be provided to monitor the failure of
supply (240V AC) to the scheme mentioned in Clause above. If the
failure of supply exists for more than 2 to 3 seconds, this relay shall
initiate visual and audible annunciation. Visual and audible annunciation
for the failure of AC supply to the annunciation system shall be provided
and this annunciation shall operate on Annunciation DC and buzzer shall
sound.
12.10. The annunciation system described above shall meet the following
additional requirements :
a) The annunciation system shall be capable of catering to at least 20
simultaneous signals at a time.
b) One set of the following push buttons shall be provided on each
control panel:
• Reset push button for annunciation system
• Accept push button for annunciation system
• Lamp test push button for testing the facia windows
c) One set of the following items shall be provided common for all the
control panel (not applicable for extension of substation) :
• Flasher relay for annunciation system
• Push button for Flasher test
• Three Push buttons for test of all audible alarm systems
d) These testing circuits shall be so connected that while testing is being
done, it shall not prevent the registering of any new annunciation that
may land during the test.
e) The annunciation shall be repetitive type and shall be capable of
registering the fleeting signal. Minimum duration of the fleeting signal
registered by the system shall be 15 milli seconds.
f) In case of static annunciator scheme, special precaution shall be
taken to ensure that spurious alarm condition does not appear due to

Tech Specification, Section: CRP Page 9 of 49

C/ENGG/SPEC/CRP REV NO: 09
 influence of external electromagnetic/ electrostatic interference on the
annunciator wiring and switching disturbances from the neighbouring
circuits within the panels and the static annunciator shall meet the
high voltage susceptibility test , impulse voltage with stand test , high
frequency disturbance test– class III and fast transient disturbance
test –level III as per IEC 60255.
12.11. The annunciation system to be supplied for existing sub-stations shall be
engineered as an extension to the existing scheme.
12.12. For the Control panel with BCU (if envisaged in section-Project),
only common alarm lamp shall be provided for each Control panel.
Each BCU of the control panel shall energize this common alarm
lamp on occurrence of alarms/Trips. All alarms shall be available in
the BCU mimic/HMI.

13. SWITCHES
13.1. Control and instrument switches shall be rotary operated type with
escutcheon plates clearly marked to show operating position and circuit
designation plates and suitable for flush mounting with only switch front
plate and operating handle projecting out.
13.2. The selection of operating handles for the different types of switches
shall be as follows :

Breaker, Isolator control : Pistol grip, black

switches
Synchronising switches : Oval, Black, Keyed handle (one
common removable handle for a
group of switches or locking facility
having common key)
synchronising Selector switches : Oval or knob, black
Instrument switches : Round, knurled, black
Protection Transfer switch, : Pistol grip, lockable and black.
Local / remote selector
switch
13.3. The control switch of breaker and isolator shall be of spring return to
neutral type. The switch shall have spring return from close and trip
positions to "after close" and "after trip" positions respectively.
13.4. Protection Transfer switch / BCU will energise a bi-stable relay for
protection transfer function from local/ remote HMI.
13.5. Instrument selection switches shall be of maintained contact (stay put)
type. Ammeter selection switches shall have make-before-break type
contacts so as to prevent open circuiting of CT secondary when
changing the position of the switch. Voltmeter transfer switches for AC
shall be suitable for reading all line- to-line and line-to-neutral voltages
for non- effectively earthed systems and for reading all line to line
Tech Specification, Section: CRP Page 10 of 49
C/ENGG/SPEC/CRP REV NO: 09
 voltages for effectively earthed systems.
13.6. Synchronising switches shall be of maintained contact (stay put) type
having a common removable handle for a group of switches. The handle
shall be removable only in the OFF position and it shall be co-ordinated
to fit in to all the synchronising switches. These switches shall be
arranged to connect the synchronising equipment when turned to the
'ON' position. One contact of each switch shall be connected in the
closing circuit of the respective breaker so that the breaker cannot be
closed until the switch is turned to the 'ON' position.
13.7. Lockable type of switches which can be locked in particular positions
shall be provided when specified. The key locks shall be fitted on the
operating handles.
13.8. The contacts of all switches shall preferably open and close with snap
action to minimise arcing. Contacts of switches shall be spring assisted
and contact faces shall be with rivets of pure silver or silver alloy.
Springs shall not be used as current carrying parts
13.9. The contact combination and their operation shall be such as to give
completeness to the interlock and function of the scheme.
13.10. The contact rating of the switches shall be as follows :

Description Contact Rating in Amps

220V DC 50V DC 240V AC

Make and carry continuously 10 10 10

Make and carry for 0.5 sec. 30 30 30

Break for Resistive load 3 20 7

Break for Inductive load 0.2 - -

with L/R = 40m sec.

14. INDICATING LAMPS

14.1. Indicating lamps shall be of cluster LED type suitable for panel mounting
with rear terminal connections. Lamps shall be provided with series
connected resistors preferably built in the lamp assembly. Lamps shall
have translucent lamp covers to diffuse lights coloured red, green,
amber, clear white or blue as specified. The lamp cover shall be
preferably of screwed type, unbreakable and moulded from heat resisting
material.

Tech Specification, Section: CRP Page 11 of 49

C/ENGG/SPEC/CRP REV NO: 09
14.2. The lamps shall be provided with suitable resistors.
14.3. Lamps and lenses shall be interchangeable and easily replaceable from
the front of the panel. Tools, if required for replacing the bulbs and
lenses shall also be included in the scope of the supply.
14.4. The indicating lamps with resistors shall withstand 120% of rated voltage
on a continuous basis.

15. POSITION INDICATORS (if Applicable)

15.1. Position indicators of "SEMAPHORE" type shall be provided when
specified as part of the mimic diagrams on panels for indicating the
position of circuit breakers, isolating/earthing switches etc. The indicator
shall be suitable for semi-flush mounting with only the front disc
projecting out and with terminal connection from the rear.
15.2. Position indicator shall be suitable for DC Voltage as specified. When the
supervised object is in the closed position, the pointer of the indicator
shall take up a position in line with the mimic bus bars, and at right
angles to them when the object is in the open position. When the supply
failure to the indicator occurs, the pointer shall take up an intermediate
position to indicate the supply failure.
15.3. The rating of the indicator shall not exceed 2.5 W.
15.4. The position indicators shall withstand 120% of rated voltage on a
continuous basis.

16. SYNCHRONISING EQUIPMENT

16.1. For sub-station equipped with sub-station Automation system, the
requirement of synchronisation is specified in section Sub-station
Automation System and the same shall prevail. For other sub-station
which is not equipped with sub-station automation system following shall
be applicable as per requirement.
16.2. The synchronising instruments shall be mounted either on a syn-
chronising trolley or on a synchronising panel. The panel/ trolley shall be
equipped with double analog voltmeters and double analog frequency
meters, synchroscope and lamps fully wired. The size of voltmeters and
frequency meters provided in the synchronising panel shall not be less
than 144 X 144 sq. mm. Suitable auxiliary voltage transformers wherever
necessary shall also be provided for synchronising condition. In case the
synchroscope is not continuously rated, a synchroscope cut-off switch
shall be provided and an indicating lamp to indicate that the
synchroscope is energised, shall also be provided.
16.3. Synchronising check relay with necessary ancillary equipment’s shall be
provided which shall permit breakers to close after checking the
requirements of synchronising of incoming and running supply. The
phase angle setting shall not exceed 35 degree and have voltage
difference setting not exceeding 10%. This relay shall have a response

Tech Specification, Section: CRP Page 12 of 49

C/ENGG/SPEC/CRP REV NO: 09
 time of less than 200 milliseconds when the two system conditions are
met within present limits and with the timer disconnected. The relay shall
have a frequency difference setting not exceeding 0.45% at rated value
and at the minimum time setting. A guard relay shall be provided to
prevent the closing attempt by means of synchronising check relay when
control switch is kept in closed position long before the two systems are
in synchronism
16.4. The synchronising panel shall be draw out and swing type which can be
swivelled in left and right direction. The synchronising panel shall be
placed along with control panels and the number of synchronising panel
shall be as indicated in BPS. The incoming and running bus wires of VT
secondary shall be connected and run as bus wires in the control panels
and will be extended to synchronising panel for synchronisation of circuit
breakers. The selector switch provided for each circuit breaker in
respective control panels shall be lockable type with a common key so
that only one selector switch is kept in synchronising mode at a time.
16.5. Alternatively, the trolley shall be of mobile type with four rubber-padding
wheels capable of rotating in 360 degree around the vertical axis.
Suitable bumpers with rubber padding shall be provided all around the
trolley to prevent any accidental damage to any panel in the control room
while the trolley is in movement. The trolley shall have two meter long
flexible cord fully wired to the instruments and terminated in a plug in
order to facilitate connecting the trolley to any of the panels. The
receptacle to accept the plug shall be provided on the panel.
16.6. At existing sub-stations, the synchronising scheme shall be engineered
to be compatible with the existing synchronising scheme and
synchronising socket/switch on the panel. In substations, where
synchronising panels are available, the bidder shall carry out the shifting
of the above panels, if required, to facilitate the extension of control
panel placement.

17. RELAYS
17.1. All relays shall conform to the requirements of IS: 3231/IEC-60255/IEC
61000 or other applicable standards. Relays shall be suitable for flush or
semi-flush mounting on the front with connections from the rear.
17.2. All protective relays shall be of numerical type and communication
protocol shall be as per IEC 61850. Protective relays shall also fulfil
the requirements specified for Protection IEDs in Section-
Substation automation system
17.3. All protective relays shall be in draw out or plug-in type/modular cases
with proper testing facilities. Necessary test plugs/test handles shall be
supplied loose and shall be included in contractor's scope of supply.
17.4. All AC operated relays shall be suitable for operation at 50 Hz. AC
Voltage operated relays shall be suitable for 110 Volts VT secondary and
current operated relays for 1 amp CT secondary. All DC operated relays
and timers shall be designed for the DC voltage specified, and shall
operate satisfactorily between 80% and 110% of rated voltage. Voltage

Tech Specification, Section: CRP Page 13 of 49

C/ENGG/SPEC/CRP REV NO: 09
 operated relays shall have adequate thermal capacity for continuous
operation.
17.5. The protective relays shall be suitable for efficient and reliable operation
of the protection scheme described in the specification. Necessary
auxiliary relays and timers required for interlocking schemes for
multiplying of contacts suiting contact duties of protective relays and
monitoring of control supplies and circuits, lockout relay monitoring
circuits etc. also required for the complete protection schemes described
in the specification shall be provided. All protective relays shall be
provided with at least two pairs of potential free isolated output contacts.
Auxiliary relays and timers shall have pairs of contacts as required to
complete the scheme; contacts shall be silver faced with spring action.
Relay case shall have adequate number of terminals for making potential
free external connections to the relay coils and contacts, including spare
contacts.
17.6. Timers shall be of solid state/numerical type. Time delay in terms of
milliseconds obtained by the external capacitor resistor combination is
not preferred and shall be avoided.
17.7. No control relay, which shall trip the power circuit breaker when the relay
is de-energised, shall be employed in the circuits.
17.8. Provision shall be made for easy isolation of trip circuits of each relay for
the purpose of testing and maintenance.
17.9. Auxiliary seal-in-units provided on the protective relays shall preferably
be of shunt reinforcement type. If series relays are used the following
shall be strictly ensured:
(a) The operating time of the series seal-in-unit shall be sufficiently shorter
than that of the trip coil or trip relay in series with which it operates to
ensure definite operation of the flag indicator of the relay.
(b) Seal-in-unit shall obtain adequate current for operation when one or
more relays operate simultaneously.
(c) Impedance of the seal-in-unit shall be small enough to permit
satisfactory operation of the trip coil on trip relays when the D.C.
Supply Voltage is minimum.
(d) Trip-circuit seal-in is required for all trip outputs, irrespective of the
magnitude of the interrupted current. The trip-circuit seal-in logic shall
not only seal-in the trip output(s),but also the relevant initiation signals
to other scheme functions, (e.g. initiate signals to the circuit-breaker
failure function, reclosing function etc.), and the alarm output signals.
(e) Two methods of seal-in are required, one based on the measurement
of AC current, catering for those circumstances for which the
interrupted current is above a set threshold, and one based on a fixed
time duration, catering for those circumstances for which the
interrupted current is small (below the set threshold).
(f) For the current seal-in method, the seal-in shall be maintained until the
circuit-breaker opens, at which time the seal-in shall reset and the seal-

Tech Specification, Section: CRP Page 14 of 49

C/ENGG/SPEC/CRP REV NO: 09
 in method shall not now revert to the fixed time duration method. For
this seal-in method, the seal-in shall be maintained for the set time
duration. For the line protection schemes, this time duration shall be
independently settable for single- and three-pole tripping.
(g) Seal-in by way of current or by way of the fixed duration timer shall
occur irrespective of whether the trip command originates from within
the main protection device itself (from any of the internal protection
functions), or from an external device with its trip output routed through
the main protection device for tripping. Trip-circuit seal-in shall not take
place under sub-harmonic conditions (e.g. reactor ring down).
17.10. The setting ranges of the relays offered, if different from the ones
specified shall also be acceptable if they meet the functional
requirements.
17.11. Any alternative/additional protections or relays considered necessary for
providing complete effective and reliable protection shall also be offered
separately. The acceptance of this alternative/ additional equipment shall
lie with the POWERGRID/Employer.
17.12. All relays and their drawings shall have phase indications as R-Red, Y-
yellow, B-blue
17.13. For numerical relays, the scope shall include the following:
a) Necessary software and hardware to up/down load the data to/from the
relay from/to the personal computer installed in the substation.
However, the supply of PC is not covered under this clause.
b) The relay shall have suitable communication facility for future
connectivity to SCADA. The relay shall be capable of supporting IEC
61850 protocol.
c) In case of line protection and transformer/reactor protection, the
features like fault recorder and event logging function as available
including available as optional feature in these relays shall be supplied
and activated at no extra cost to the owner. Also necessary software/
hardware for automatic uploading to station HMI/DR work station (as
applicable) shall be supplied. It is to be clearly understood that these
shall be in addition to Fault recorder function as specified at clause no.
28.
18. TRANSMISSION LINE PROTECTION
18.1. All relays shall be suitable for series compensated line.
18.2. The line protection relays are required to protect the line and clear the
faults on line within shortest possible time with reliability, selectivity and
full sensitivity to all type of faults on lines. The general concept is to
have two main protections having equal performance requirement
specially in respect of time as called Main-I and Main-II for 765kV,
400KV and 220KV transmission lines and Main and back up protection
for 132 KV transmission lines.
18.3. The Transmission system for which the protection equipment are
required is indicated in Section – Project.

Tech Specification, Section: CRP Page 15 of 49

C/ENGG/SPEC/CRP REV NO: 09
18.4. The maximum fault current could be as high as 63kA but the minimum
fault current could be as low as 20% of rated current of CT secondary.
The starting & measuring relays characteristics should be satisfactory
under these extremely varying conditions.
18.5. The protective relays shall be suitable for use with capacitor voltage
transformers having non-electronic damping and transient response as
per IEC.
18.6. Fault Recorder, Distance to fault Locator and Over voltage relay (stage -
1/2) functions if offered as an integral part of line protection relays, shall
be acceptable provided these meet the technical requirements as
specified in the respective clauses.
18.7. Auto reclose relay function if offered as an integral part of line distance
protection relay, shall be acceptable for 132kV & below lines only
provided the auto reclose relay feature meets the technical requirements
as specified in the respective clause.
18.8. The following protections shall be provided for each of the Transmission
lines:
For 765kV, 400kV & 220kV Lines
Main-I: Distance protection scheme.
Main-II: Distance protection scheme

If specified in Section-Project, Main-I and / or Main-II relay

shall be provided as Line differential protection relay with
built in distance function. Further, matching Line differential
protection relays for remote ends shall be provided as per
Bid Price Schedule (BPS).

Main-I & Main-II relay shall be of different make & model.
Same make relay shall be acceptable only if they are of
different hardware & manufacturing platform.

If specified in the “Section- Project, “back up Over current and
Earth fault protection shall be provided instead of Main -II
protection scheme for 220KV lines to match with requirements
at the remote ends.

For 132KV
Main: Distance protection scheme
Back up: Directional Over Current and Earth fault Protection
The detailed description of line protections is given here under.

18.9. Main-I and Main-II Distance Protection scheme:

(a) shall have continuous self monitoring and diagnostic feature

Tech Specification, Section: CRP Page 16 of 49

C/ENGG/SPEC/CRP REV NO: 09
 (b) shall be non-switched type with separate measurements for all phase
to phase and phase to ground faults
(c) shall have stepped time-distance characteristics and independent
three forward zones and one reverse/offset zone
(d) shall have mho or quadrilateral or other suitably shaped characteristics
for all zones.
(e) shall have following maximum operating time (including trip relay time,
if any) under given set of conditions and with CVT being used on line
(with all filters included)

(i) for 765 KV, 400 KV & 220 KV lines:

For Source to Impedance
ratio:
4 15
Relay setting (Ohms) (10 or 20) and 2 2
Fault Locations 50 50
(as % of relay setting)
Fault resistance (Ohms) 0 0
Maximum operating time 40 for all faults 45 for 3 ph. Faults
(Milliseconds ) & 60 for all other
faults
(ii) for 132 KV lines:
A relaxation of 5 ms in above timings is allowed for 132 KV lines.
(f) The relay shall have an adjustable characteristics angle setting range
of 30-85 degree or shall have independent resistance(R) and
reactance (X) setting.
(g) shall have two independent continuously variable time setting range of
0-3 seconds for zone-2 and 0-5 seconds for zone-3/reverse zone.
(h) shall have resetting time of less than 55 milli-seconds (including the
resetting time of trip relays)
(i) shall have variable residual compensation for each zone
(j) shall have memory techniques with defined characteristics in all three
phases to ensure correct operation during close-up 3 phase faults and
other adverse conditions and shall operate instantaneously when cir-
cuit breaker is closed to zero-volt 3 phase fault
(k) shall have weak end in-feed feature
(l) shall be suitable for single & three phase tripping
(m) shall have a continuous current rating of two times of rated current.
The voltage circuit shall be capable of operation at 1.2 times rated
voltage. The relay shall also be capable of carrying a high short time
current of 70 times rated current without damage for a period of 1 sec.
(n) shall be provided with necessary self reset type trip duty contacts for

Tech Specification, Section: CRP Page 17 of 49

C/ENGG/SPEC/CRP REV NO: 09
 completion of the scheme (Minimum number of these trip duty
contacts shall be four per phase) either through built in or through
separate high speed trip relays. Making capacity of these trip contacts
shall be 30 amp for 0.2 seconds with an inductive load of L/R > 10 milli
seconds. If separate high speed trip relays are used , the operating
time of the same shall not be more than 10 milliseconds
(o) shall be suitable for use in permissive under reach/ over reach/
blocking communication mode
(p) shall have suitable number of potential free contacts for Carrier aided
Tripping, Auto reclosing, CB failure, Disturbance/Fault recorder & Data
acquisition system
(q) include power swing blocking and out-of-step protection which shall
• have suitable setting range to encircle the distance
protection described above
• block tripping of distance function zones during power
swing conditions
• release blocking in the event of actual fault
• release tripping on detection of out-of-step power
swing condition
Alternatively standalone relay for out of step protection shall
also be acceptable, if the same is not part of main protection
relays.
(r) include fuse failure protection which shall monitor all the three fuses of
C.V.T. and associated cable against open circuit
• inhibit trip circuits on operation and initiate annunciation
• have an operating time less than 7 milliseconds
• remain inoperative for system earth faults
(s) include a directional back up Inverse Definite Minimum Time (IDMT)
earth fault relay with normal inverse characteristics as per IEC 60255-3
as a built in feature or as a separate unit for 765kV, 400 KV and 220KV
transmission lines
(t) Must have a current reversal guard feature.
(u) Shall have Stub protection function with current setting minimum
range of 1 to 3 pu with definite time delay setting minimum range
of 0 to 100msec.
(v) have feature of load encroachment blinder to safeguard the
protection trip during heavy line loading condition.
18.10. Line Differential Relay protection scheme (If applicable)
The line current differential relay with built-in distance protection function
shall be capable of being selected to differential function with back up
distance function or shall activate back up distance automatically when
the differential relay is out of service. The relay shall fulfil the requirement

Tech Specification, Section: CRP Page 18 of 49

C/ENGG/SPEC/CRP REV NO: 09
 specified above at clause 18.9 for distance relay function.
Further, the line current differential function shall conform to the following
main requirements:
i. The current differential shall be a unit system of protection.
ii. The line Current differential Protection shall comprise a well-
proven high-speed phase segregated numerical current
differential protection scheme, which shall be designed for the
selective protection of the EHV network.
iii. The High speed numerical current differential protection shall be
suitable to work through directly connected fiber optics and the
relay shall have the requisite teleprotection communication
capability.
iv. Shall have built-in signalling modules for communication with the
remote end relay via direct optical fiber cables.
v. The contractor shall coordinate the requirements of the current
differential relay with the communication system in order to
ensure compatibility between the two.
vi. The relay shall incorporate inter-tripping, VT Supervision
functions and heavy duty contacts for tripping of the feeder
circuit breaker as well as provide all flagging, alarms etc.
vii. Shall have high-speed fault detection capability with typical relay
operation time of less than 30 ms for 765kV/400kV/220kV line
faults and less than 40 ms for 132kV & below.
viii. Shall have high sensitivity for all types of faults.
ix. Shall detect and clear faults along the whole length of the feeder
within the specified operating time when the remote end breaker
is open or there is a weak in feed.
x. Shall remain stable for fault on a parallel feeder under
subsequent current reversal in the healthy feeder due to slow
opening of one of the faulty feeder's circuit breakers.
xi. Shall not be affected by heavy load transfer, power swings, CT
saturation, distorted primary currents and voltages, VT fuse
failure, line charging currents external switching, arc or tower
footing resistance, sudden power reversal, zero sequence
mutual coupling, fault resistance and out of phase source at the
two line terminals producing misleading apparent fault
reactance, power frequency variations, collapse of voltage on
the faulted phase(s), etc.
xii. Shall have features to clear close in faults at high speed in the
event of failure of signalling channel.
xiii. Shall have features to test at one end all the functions
associated with the protection, without the presence of
personnel at the remote end.
xiv. Shall have features to block relay in case of signalling channel
Tech Specification, Section: CRP Page 19 of 49
C/ENGG/SPEC/CRP REV NO: 09
 failure or remote relay out of service / block or setting mismatch
or dc failure etc., to avoid inadvertent tripping and shall produce
alarm during blocking.
xv. Shall have inter-tripping compliant with IEC60834-1 and
IEC60834–2 respectively for signalling as appropriate.
xvi. The line differential device address shall be settable and shall be
suitable to set for no. of feeders shown in SLD.
xvii. CT supervision / VT Supervision shall be configured to initiate
alarm locally and to sub-station automation system or event
recorder as per requirement.
xviii. Shall have single pole/three pole tripping feature.
xix. Shall have built-in SOTF logic feature.
xx. Shall have features to block auto-reclose internally or externally
at local end and facility to send blocking signals to remote end
relay internally (through FO communication channels) during
SOTF trips.
xxi. Shall have facility to configure signal transferred between local
and remote end relays in the internal event recorder and
disturbance recorder.
xxii. Shall have configurable time delayed thermal protection element
and back up earth fault protection element.
xxiii. Shall have following features:
• Satisfactory Performance of relay under CT saturation during
through faults.
• Satisfactory Performance of relay under conditions of CT
saturation for in zone faults.
• Satisfactory Performance of relay during transient (jitter) and
permanent changes in signalling propagation delays.
xxiv. Shall include necessary Optical fibre cable & associated
accessories for connection between the current differential relay
panel and existing Fibre optic distribution panel (FODP).
18.11. Back-up Directional Over Current and Earth fault protection
scheme
(a) shall have three over current and one earth fault element(s) which shall
be either independent or composite unit(s)
(b) shall include necessary VT fuse failure relays for alarm purposes
(c) over current elements shall
• have IDMT characteristic (normal inverse as per IEC)
• have a variable setting range of 50-200% of rated current
• have a characteristic angle of 30/45 degree lead
• include hand reset flag indicators or LEDs

Tech Specification, Section: CRP Page 20 of 49

C/ENGG/SPEC/CRP REV NO: 09
 (d) earth fault element shall
• have IDMT characteristic (normal inverse as per IEC)
• have a variable setting range of 20-80% of rated current
• have a characteristic angle of 45/60 degree lag
• include hand reset flag indicators or LEDs
• include necessary separate interposing voltage transformers or
have internal feature in the relay for open delta voltage to the
relay
18.12. LINE OVER VOLTAGE PROTECTION RELAY shall
(a) monitor all three phases
(b) have two independent stages
(c) be either a standalone relay for both stage-I & II or as built in
function of Main-I & Main-II distance relay for both stage-I & II.
(d) have an adjustable setting range of 100-170% of rated voltage with a
setting least count of 0.1V (Secondary volts) and an adjustable time
delay range of 1 to 60 seconds for the first stage.
(e) have an adjustable setting range of 100-170% of rated voltage with a
time delay of 100-200 mill seconds for the second stage.
(f) be tuned to power frequency
(g) provided with separate operation indicators (flag target) and signal for
each stage relays with phase indication for event logging.
(h) have a drop-off to pick-up ratio greater than 97%
18.13. All trip relays used in transmission line protection scheme shall be of
self/electrical reset type depending on application requirement.
19. CIRCUIT BREAKER PROTECTION:
This shall include following functions:
19.1. Numerical AUTO RECLOSING function shall
(a) have single phase reclosing facilities
(b) have a continuously variable single phase dead time range of 0.1-2
seconds
(c) have a continuously variable reclaim time range of 5-300 seconds
(d) Incorporate a two position selector switch, from which single phase
auto-reclosure and non-auto reclosure mode can be selected.
Alternatively, the mode of auto reclosing can be selected through HMI
of the relay or BCU & SAS.
(e) be of single shot type
(f) have priority circuit for closing of both circuit breakers in case of one
and half breaker arrangements to allow sequential closing of breakers
(g) However, Auto-reclose as in built function of bay controller unit (BCU)

Tech Specification, Section: CRP Page 21 of 49

C/ENGG/SPEC/CRP REV NO: 09
 (if supplied) is also acceptable provided the signal exchange for
auto-reclose function from BCU to main Relays & vice-versa is
achieved through hardwiring.
19.2. LOCAL BREAKER BACK-UP (LBB) PROTECTION SCHEME shall
(a) be triple pole type
(b) have an operating time of less than 15 milli seconds
(c) have a resetting time of less than 15 milli seconds
(d) have three over current elements
(e) be arranged to get individual initiation from the corresponding
phase of main protections of line for each over current element.
However, common three phase initiation is acceptable for other
protections and transformer /reactor equipment protections
(f) have a setting range of 10-80% of rated current
(g) have a continuous thermal withstand two times rated current
irrespective of the setting
(h) have a timer with continuously adjustable setting range of 0.1-
1 seconds
(i) have necessary auxiliary relays to make a comprehensive
scheme
(j) Shall have re-trip feature for tripping its own CB after
initiation with a set time delay.
(k) be acceptable as Built-in protection function of distributed
bus bar protection scheme only; however in that case
separate LBB relay shall be provided for tie bays.
(l) be similar relays for complete scope of work as per specification
(if provided as standalone relay unit).

20. REACTOR PROTECTION

20.1. Differential Protection Relay shall
(a) be triple pole type
(b) have operation time less than 25 milli-seconds at 5 times setting
(c) be tuned to system frequency
(d) have current setting range of 10 to 40% of 1 Amp. or a suitable
voltage setting range
(e) be high impedance / biased differential type
(f) be stable for all external faults, CT saturation.
20.2. Restricted Earth Fault Protection Relay shall
(a) be single pole type
(b) be of current/voltage operated high impedance type

Tech Specification, Section: CRP Page 22 of 49

C/ENGG/SPEC/CRP REV NO: 09
 (c) have a current setting of 05-40% of 1 Amp./have a suitable
voltage setting range
(d) be tuned to system frequency
(e) have a suitable non-linear resistor to limit the peak voltage to
1000 Volts
(f) Separate relay shall be provided for 1-phase spare reactor
unit (if envisaged).
20.3. Back up impedance protection Relay shall
(a) be triple pole type, with faulty phase identification/ indication
(b) be single step polarised 'mho' distance/ impedance relay suitable
for measuring phase to ground and phase to phase faults
(c) have adequate ohmic setting range to cover at least 60% of the
impedance of the reactor and shall be continuously variable
(d) have an adjustable characteristic angle of 30-80 degree
(e) have a definite time delay relay with a continuously adjustable
setting range of 0.2-2.0 seconds
(f) include VT failure relay which shall block the tripping during VT
fuse failure condition
(g) have Back-up over current and earth fault protection as built
in function
20.4. Further, Reactor auxiliary protections contacts (Buchholz, PRV, Oil
Temperature, Winding Temperature etc.) can be wired suitably in above
protections or provide separate Flag relays/Auxiliary relays as per
scheme requirements. Further reactor protections shall be grouped
such that Differential protection, Buchholz-I trip and Winding
temperature trip are on DC-A while REF protection, Back-up
Impedance protection, PRD-I and Oil temperature trip are on DC-B.
In case multiple trip contacts for Buchholz relay / PRD relays are
available, then their contacts shall be wired to both Group of
Protection.
21. TRANSFORMER PROTECTION
21.1. Transformer differential protection scheme shall
(a) be triple pole type, with faulty phase identification/ indication
(b) have an operating time not greater than 30 milli seconds at 5
times the rated current
(c) have three instantaneous high set over-current units
(d) be bias differential type having an adjustable bias setting
range of 10-50%
(e) be suitable for 04 nos. of 3-ph CT input with rated CT
secondary current of 1 Amp.
(f) have second harmonic or other inrush proof features and also

Tech Specification, Section: CRP Page 23 of 49

C/ENGG/SPEC/CRP REV NO: 09
 should be stable under normal over fluxing conditions.
Magnetising inrush proof feature shall not be achieved through
any intentional time delay e.g. use of timers to block relay
operation or using disc operated relays
(g) have an operating current setting of 15% or less
(h) include necessary separate interposing current transformers for
angle and ratio correction or have internal feature in the relay to
take care of the angle & ratio correction
(i) have a fault recording feature to record graphic form of
instantaneous values of following analogue channels during
faults and disturbances for the pre fault and post fault period:
Current in all three windings in nine / twelve analogue channels
in case of 400kV class / 765kV class respectively or 6 analogue
channels for lower voltage transformers and Voltage in one
channel
The disturbance recorder function built in the Differential protection
IED shall have the facility to record the following external digital
channel signals associated with transformer which shall be wired to
differential relay apart from the digital signals pertaining to differential
relay:
1. REF protection operated
2. HV Breaker status (Main & tie/transfer both separately)
3. IV Breaker status (Main & tie/transfer both separately)
4. Bucholz / OLTC/ WTI/ OTI alarm
5. Bucholz / PRD / SPR/ Trip
6. Group-A, Group-B lock-out relay trip
Necessary hardware and software, for automatic up-loading the data
captured by disturbance recorder to the personal computer (DR Work
Station) available in the substation, shall be included in the scope.
21.2. Over Fluxing Protection Relays shall
(a) operate on the principle of Voltage to frequency ratio and shall be
phase to phase connected
(b) have inverse time characteristics, matching with transformer over
fluxing withstand capability curve
(c) provide an independent 'alarm' with the time delay continuously
adjustable between 0.1 to 6.0 seconds at values of 'v/f' between
100% to 130% of rated values
(d) tripping time shall be governed by 'v/f' Versus time characteristics
of the relay
(e) have a set of characteristics for Various time multiplier settings.
The maximum operating time of the relay shall not exceed 3
seconds and 1.5 seconds at 'v/f' values of 1.4 and 1.5 times, the

Tech Specification, Section: CRP Page 24 of 49

C/ENGG/SPEC/CRP REV NO: 09
 rated values, respectively.
(f) have an accuracy of operating time, better than ±10%
(g) have a resetting ratio of 97 % or better.

21.3. Restricted Earth Fault Protection shall

(a) be single pole type
(b) be of current/voltage operated type
(c) have a current setting range of 5-40% of 1 Amp./ have a suitable
voltage setting range
(d) be tuned to the system frequency
(e) be phase segregated type for 1-ph transformer units
(f) Separate relay shall be provided for 1-phase spare
transformer unit (if envisaged).

21.4. Back-up Over Current and Earth fault protection scheme with high
set feature
(a) Shall have three over current and one earth fault element(s)
which shall be either independent or composite unit(s).
(b) The scheme shall include necessary VT fuse failure relays for
alarm purposes
(c) Over current relay shall
• have directional IDMT characteristic with a definite
minimum time of 3.0 seconds at 10 times setting and have
a variable setting range of 50-200% of rated current
• have low transient, over reach high set instantaneous unit
of continuously variable setting range 500-2000 % of rated
current
• have a characteristic angle of 30/45 degree lead
• include hand reset flag indicators or LEDs.
(d) Earth fault relay shall
• have directional IDMT characteristic with a definite
minimum time of 3.0 seconds at 10 times setting and have
a variable setting range of 20-80% of rated current
• have low transient, over reach high set instantaneous unit
of continuously variable setting range 200-800 % of rated
current
• have a characteristic angle of 45/60 degree lag
• include hand reset flag indicators or LEDs
• include necessary separate interposing voltage
Tech Specification, Section: CRP Page 25 of 49
C/ENGG/SPEC/CRP REV NO: 09
 transformers or have internal feature in the relay for open
delta voltage to the relay
21.5. Transformer Overload Protection Relay shall
(a) be of single pole type
(b) be of definite time over-current type
(c) have one set of over-current relay element, with continuously
adjustable setting range of 50-200% of rated current
(d) have one adjustable time delay relay for alarm having setting
range of 1 to 10.0 seconds, continuously.
(e) have a drop-off/pick-up ratio greater than 95%.

21.6. Transformer Neutral Current Protection relay (for 1-Phase

transformer bank neutral) shall
(a) have directional IDMT characteristic with a definite minimum time
of 3.0 seconds at 10 times setting and have a variable setting
range of 20-80% of rated current.
21.7. Further, Transformer auxiliary protections contacts (Buchholz, PRD,
SPRD, Oil Temperature, Winding Temperature, OLTC Buchholz etc.
can be wired suitably in above protections or provide separate Flag
relays/Auxiliary relays as per scheme requirements. Further,
transformer protections shall be grouped such that Differential
trip, Buchholz-I trip, Oil temperature alarm and Winding
temperature trip are on DC source-A while REF trip, Buchholz
alarm, PRD-I trip, winding temperature alarm and Oil temperature
trip are on DC source-B. In case multiple trip contacts for Buchholz
relay / PRD relays are available, then their contacts shall be wired
to both Group of Protection.

22. TEE DIFFERENTIAL PROTECTION RELAYS (If Applicable)

22.1. TEE-1 Differential (Bias) protection relay shall

(a) be triple pole type
(b) have an operating time less than 30 milliseconds at 5 times the
rated current
(c) have three instantaneous high set over current units
(d) have an adjustable bias setting range of 20-50%
(e) have an operating current setting of 15% of 1 Amp or less
22.2. TEE-2 Differential (High Impedance) Protection relay shall
(a) be triple pole type
(b) have operating time less than 25 milliseconds at 5 times setting

Tech Specification, Section: CRP Page 26 of 49

C/ENGG/SPEC/CRP REV NO: 09
 (c) be tuned to system frequency
(d) have current setting range of 20 to 80% of 1 Amp
(e) be voltage operated, high impedance type
(f) be stable for all external faults
(g) be provided with suitable non linear resistors across the relay to
limit the peak voltage to 1000 volts
23. TRIP CIRCUIT SUPERVISION RELAY
(a) The relay shall be capable of monitoring the healthiness of each
'phase' trip-coil and associated circuit of circuit breaker during
'ON' and 'OFF' conditions.
(b) The relay shall have adequate contacts for providing connection
to alarm and event logging.
(c) The relay shall have time delay on drop-off of not less than 200
milli seconds and be provided with operation indications for each
phase
24. TRIPPING RELAY
High Speed Tripping Relay shall
(a) be instantaneous (operating time not to exceed 10 milli-seconds).
(b) reset within 20 milli seconds
(c) be D.C. operated
(d) have adequate contacts to meet the requirement of scheme,
other functions like auto-reclose relay, LBB relay as well as cater
to associated equipment like event logger (SAS), Disturbance
recorder, fault Locator, etc.
(e) be provided with operation indicators for each element/coil.
25. DC SUPPLY SUPERIVISION RELAY
(a) The relay shall be capable of monitoring the failure of D.C. supply
to which, it is connected.
(b) It shall have adequate potential free contacts to meet the scheme
requirement.
(c) The relay shall have a 'time delay on drop-off' of not less than
100 milli seconds and be provided with operation indicator/flag.
26. BUS BAR PROTECTION
26.1. Redundant (1+1) numerical low impedance biased differential Bus
Bar protection scheme for each Main bus (Bus1 / Bus2) & Transfer Bus
(as applicable) for 400kV and 765kV shall be provided. The scheme
shall be engineered so as to ensure that operation of any one out of two
schemes connected to faulty bus shall result in tripping of the same.
26.2. Single bus bar protection scheme shall be provided for each main bus
and transfer bus (as applicable) for 220KV and 132 KV voltage levels.

Tech Specification, Section: CRP Page 27 of 49

C/ENGG/SPEC/CRP REV NO: 09
26.3. Each Bus Bar protection scheme shall
(a) have maximum operating time up to trip impulse to trip relay of
25 milli seconds at 5 times setting value for all types of faults.
(b) operate selectively for each bus bar
(c) give hundred percent security up to 63 KA fault level for 400KV
and 220KV and 31.5 KA for 132 KV system.
(d) incorporate continuous supervision for CT secondary against any
possible open circuit and if it occurs, shall render the relevant
zone of protection inoperative and initiate an alarm.
(e) not give false operation during normal load flow in bus bars
(f) not cause tripping for the differential current below the load
current of heaviest loaded feeder. Contractor shall submit
application check for the same.
(g) be of phase segregated and triple pole type
(h) incorporate clear zone indication
(i) provide independent zones of protection (including transfer bus if
any). If the bus section is provided then each side of bus section
shall have separate set of bus bar protection schemes
(j) include protection 'IN/OUT' switch for each zone
(k) include individual high speed electrically reset tripping relays for
each feeder. However, in case of distributed Bus bar protection,
individual trip relay shall not be required if bay unit is having trip
duty contacts for breaker tripping.
(l) be transient free in operation
(m) include continuous D.C. supplies supervision
(n) shall include necessary C.T. switching relays wherever C.T.
switching is involved and have 'CT' selection incomplete alarm
(o) shall include trip relays, CT switching relays (if applicable),
auxiliary CTs (if applicable) as well as additional power supply
modules, input modules etc. as may be required to provide a
Bus-bar protection scheme for the complete bus arrangement i.e.
for all the bays or breakers including future bays as per the
Single line diagram for new substations. However for extension
of bus bar protection scheme in existing substations, scope shall
be limited to the bay or breakers covered in the scope of work.
Suitable panels (if required) to mount these are also included in
the scope of the work.
(p) In case of distributed Bus bar Protection, the bay units for future
bays may be installed in a separate panel and the same shall be
located in switchyard panel room where bus bar protection panel
shall be installed.
26.4. At existing substations, Bus-bar protection scheme with independent
zones for each bus, will be available. All necessary co-ordination for
Tech Specification, Section: CRP Page 28 of 49
C/ENGG/SPEC/CRP REV NO: 09
 'AC' and 'DC' interconnections between existing schemes (Panels) and
the bays proposed under the scope of this contract shall be fully
covered by the bidder. Any auxiliary relay, trip relay, flag relay and multi
tap auxiliary CTs (in case of biased differential protection) required to
facilitate the operation of the bays covered under this contract shall be
fully covered in the scope of the bidder.. .
26.5. The test terminal blocks (TTB) to be provided shall be fully enclosed
with removable covers and made of moulded, non-inflammable plastic
material with boxes and barriers moulded integrally. All terminals shall
be clearly marked with identification numbers or letters to facilitate
connection to external wiring. Terminal block shall have shorting,
disconnecting and testing facilities for CT circuits.

27. WEATHER PROOF RELAY PANELS (For CT switching, If Applicable)

(a) This panel shall include necessary number of electrically reset
relays each with at least eight contacts for isolator auxiliary
contacts multiplication and for changing the CT and DC circuits
to relevant zones of bus bar protection.
(b) The panel shall be sheet steel enclosed and shall be dust,
weather and vermin proof. Sheet steel used shall be at least 2.0
mm thick and properly braced to prevent wobbling.
(c) The enclosures of the panel shall provide a degree of protection
of not less than IP-55 (as per IS: 2147).
(d) The panel shall be of free standing floor mounting type or
pedestal mounting type as per requirement.
(e) The panel shall be provided with double hinged doors with
padlocking arrangement.
(f) All doors, removable covers and panels shall be gasketed all
around with synthetic Neoprene/EPDM gaskets generally
conforming with provision of IS 11149. However, XLPE gaskets
can also be used for fixing protective glass doors. Ventilating
louvers, if provided shall have screens and filters. The screens
shall be made of either brass or GI wire mesh.
(g) Cable entries shall be from bottom. Suitable removable cable
gland plate shall be provided on the cabinet for this purpose.
(h) All sheet steel work shall be degreased, pickled, phosphated
and then applied with two coats of zinc chromates primer and
two coats of finishing synthetic enamel paint, both inside and
outside. The colour of the finishing paint shall be light grey in
accordance with shade no.697 of IS: 5.
(i) Suitable heaters shall be mounted in the panel to prevent
condensation. Heaters shall be controlled by thermostats so
that the cubicle temperature does not exceed 30oC. On-off

Tech Specification, Section: CRP Page 29 of 49

C/ENGG/SPEC/CRP REV NO: 09
 switch and fuse shall be provided. Heater shall be suitable for
240V AC supply Voltage.
(j) The test terminal blocks (TTB) to be provided shall be fully
enclosed with removable covers and made of moulded, non-
inflammable plastic material with boxes and barriers moulded
integrally. All terminals shall be clearly marked with identification
numbers or letters to facilitate connection to external wiring.
Terminal block shall have shorting, disconnecting and testing
facilities for CT circuits.
28. FAULT RECORDER
28.1. The fault recorder shall be provided for transmission lines. The fault
recorder as in-built feature of line distance relay is also acceptable
provided the requirements of following clauses are met.
28.2. Fault recorder shall be microprocessor based and shall be used to
record the graphic form of instantaneous values of voltage and current
in all three phases, open delta voltage & neutral current, open or closed
position of relay contacts and breakers during the system disturbances.
28.3. The Fault recorder shall consist of individual acquisition units, one for
each feeder and an Evaluation unit which is common for the entire
Substation. Whenever, more than one acquisition units are connected to
an Evaluation unit, necessary hardware and software shall also be
supplied for on line transfer of data from all acquisition units to
Evaluation unit.
28.4. The acquisition unit is connected with evaluation unit being supplied as
described in section sub-station automation through bus conforming to
IEC 61850. In case of extension sub-station which is equipped with
Sub-station Automation System based on IEC 61850, one set of
evaluation software shall be supplied and loaded in existing fault
recorder evaluation unit. Automatic uploading of disturbance files from
acquisition unit to evaluation unit shall be done through existing station
bus only conforming to IEC 61850. Necessary configuration/updation
including hardware if any shall be in the scope of the contractor.
28.5. In case of extension of existing substation(s) which are without sub-
station automation system, one set of Evaluation unit shall be supplied
for each substation where ever disturbance recorders are required (as
per section-Project) to be supplied along with necessary evaluation
software as specified above. The Evaluation unit shall consist of a
desktop personal computer (including at least 17” TFT colour monitor,
mouse and keyboard) and A4 size colour printer. The desktop PC shall
have I5 processor or better and having a clock speed 2.0 GHz or better.
The hard disk capacity of PC shall not be less than 1000 GB and RAM
capacity shall not be less than 4 GB.
28.6. The evaluation unit hardware, for substations having SAS, shall be as
described in section sub-station automation system.
28.7. Fault recorder shall have atleast 8 analogue and 16 digital channels for
each feeder.

Tech Specification, Section: CRP Page 30 of 49

C/ENGG/SPEC/CRP REV NO: 09
28.8. Acquisition units shall acquire the Disturbance data for the pre fault and
post fault period and transfer them to Evaluation unit automatically to
store in the hard disk. The acquisition units shall be located in the
protection panels of the respective feeders.
28.9. The acquisition unit shall be suitable for inputs from current
transformers with 1A rated secondary and capacitive voltage
transformers with 63.5V (phase to neutral voltage) rated secondary.
Any device required for processing of input signals in order to make the
signals compatible to the Fault recorder equipment shall form an
integral part of it. However, such processing of input signals shall in no
way distort its waveform.
28.10. The equipment shall be carefully screened, shielded, earthed and
protected as may be required for its safe functioning. Also, the Fault
recorder shall have stable software, reliable hardware, simplicity of
maintenance and immunity from the effects of the hostile environment of
EHV switchyard which are prone to various interference signals typically
from large switching transients.
28.11. Void
28.12. Evaluation software shall be provided for the analysis and evaluation of
the recorded data made available in the PC under WINDOWS
environment. The Software features shall include repositioning of
analog and digital signals, selection and amplification of time and
amplitude scales of each analogue and digital channel, calculation of
MAX/MIN frequency, phase difference values, recording of MAX/MIN
values etc. of analogue channel, group of signal to be drawn on the
same axis etc, listing and numbering of all analogue and digital
channels and current, voltage, frequency and phase difference values at
the time of fault/tripping. Also, the software should be capable of
carrying out Fourier /Harmonic analysis of the current and voltage wave
forms. The Disturbance records shall also be available in COMTRADE
format (IEEE standard- Common Format for Transient data Exchange
for Power System)
28.13. The Evaluation unit shall be connected to the color printer to obtain the
graphic form of disturbances whenever desired by the operator.
28.14. Fault recorder acquisition units shall be suitable to operate from 220V
DC or 110V DC as available at sub-station. Evaluation unit along with
the printer shall normally be connected to 230V, single phase AC
supply. In case of failure of AC supply, Evaluation unit and printer shall
be switched automatically to the station DC through Inverter of
adequate capacity which shall form a part of Fault recorder system. The
inverter of adequate capacity shall be provided to cater the requirement
specified in section - sub-station automation and DR evaluation unit.
28.15. The acquisition unit shall have the following features
(a) Facility shall exist to alarm operator in case of any internal faults
in the acquisition units such as power supply fail, processor /
memory fail etc and same shall be wired to annunciation system
/SAS.
Tech Specification, Section: CRP Page 31 of 49
C/ENGG/SPEC/CRP REV NO: 09
 (b) The frequency response shall be 5 Hz on lower side and 250 Hz
or better on upper side.
(c) Scan rate shall be 1000 Hz/channel or better.
(d) Pre-fault time shall not be less than 500 milliseconds and the
post fault time shall not be less than 2 seconds (adjustable). If
another system fault occurs during one post-fault run time, the
recorder shall also be able to record the same. However, the
total memory of acquisition unit shall not be less than 5.0
seconds.
(e) The open delta voltage and neutral current shall be derived either
through software or externally by providing necessary auxiliary
transformers.
(f) The acquisition unit for line fault recorder shall be typically used
to record at least the following digital channels :
1 Main CB R phase open
2 Main CB Y phase open
3 Main CB B phase open
4 Tie/TBC CB R phase open
5 Tie/TBC CB Y phase open
6 Tie/TBC CB B phase open
7 Main-1 carrier received
8 Main-1 protection operated
9 Main/Tie /TBC Auto reclosed operated
10 Over Voltage -Stage-1 /2 operated
11 Reactor / Stub/TEE-1/2/UF protection operated
12 Direct Trip received
13 Main-2 carrier received
14 Main- 2/ Back Up protection operated
15 Bus bar protection operated
16 LBB operated of main /tie/TBC circuit breaker
(g) In case the Fault recorder is in-built part of line distance protection,
above digital channels may be interfaced either externally or
internally.
(h) The sequence of digital channels shall be as per above list and
which shall be ensured by the contractor. Digital channels shall
be named suitably for easy identification of signals in the fault
recordings.
(i) Any digital signal can be programmed to act as trigger for the
acquisition unit. Analog channels should have programmable
threshold levels for triggers and selection for over or under levels

Tech Specification, Section: CRP Page 32 of 49

C/ENGG/SPEC/CRP REV NO: 09
 should be possible.
28.16. The colour laser printer (A4 size) shall be provided which shall be
compatible with the desktop PC and shall use Plain paper. The print out
shall contain the Feeder identity, Date and time (in hour, minute and
second up to 100th of a second), identity of trigger source and Graphic
form of analogue and digital signals of all the channels.
28.17. Each Fault recorder shall have its own time generator and the clock of the
time generator shall be such that the drift is limited to +0.5 seconds/day, if
allowed to run without synchronisation. Further, Fault recorder shall have
facility to synchronise its time generator from Time Synchronisation
Equipment having output of following types :
• Voltage signal : (0-5V continuously settable, with 50m Sec.
minimum pulse duration)
• Potential free contact (Minimum pulse duration of 50 m Sec.)
• IRIG-B
• RS232C
• SNTP
The recorder shall give annunciation in case of absence of synchronising
within a specified time.
28.18. Substations where Time Synchronisation Equipment is not available, time
generator of any one of the Fault recorders can be taken as master and
time generators of other Fault recorders and Event loggers in that station
shall be synchronised to follow the master.
29. STANDALONE DISTURBANCE RECORDER ( for 765 KV Feeders only)
A separate numerical disturbance recording function shall be provided for
each 765kV lines. The following requirements shall be met:
29.1. The disturbance recorder shall record the analogue values form of the
instantaneous values of voltage and current in all three phases, the open
delta voltage and the neutral current. The open or closed position of relay
contacts and circuit breakers during system disturbances shall also be
recorded.
29.2. The disturbance recorder shall comprise distributed individual acquisition
units, one for each feeder and an evaluation unit which is common for the
entire substation. The acquisition units shall acquire the disturbance data
for the pre-fault, fault and post-fault periods and transfer them to the
evaluation unit automatically for storage on a mass storage device. The
acquisition unit shall be suitable for inputs from current transformers with 1
A rated secondaries and capacitive voltage transformers with 63.5 V
(phase-to-neutral voltage) rated secondaries.
29.3. The acquisition units shall have the following features:
(a) A facility to alert the operator in the case of any internal faults (such
as power supply fail, processor/memory fail etc.) in any of the
acquisition units and this alarm shall be wired to the station

Tech Specification, Section: CRP Page 33 of 49

C/ENGG/SPEC/CRP REV NO: 09
 annunciation system.
(b) The pre-fault time shall not be less than 200 milliseconds and the
post fault time shall not be less than 2 seconds (adjustable). If
another system disturbance occurs during a post-fault run time, the
recorder shall also be able to record this subsequent disturbance.
The scan rate should be selectable in the range from 1000 Hz to
5000 Hz.
(c) The open delta voltage and neutral current shall be derived either
through software or externally by providing necessary auxiliary
transformers.
(d) The acquisition unit shall be typically used to record at least the
following digital channels:
1. Main circuit-breaker R-phase open
2. Main circuit-breaker Y-phase open
3. Main circuit-breaker B-phase open
4. Main 1 carrier received
5. Main 1 protection operated
6. Main/Tie auto-reclose operated
7. Overvoltage stage 1/2 operated
8. Reactor/Stub-1/2 protection operated
9. Direct trip received
10. Main 2 carrier received
11. Main 2 protection operated
12. Busbar protection operated
13. Breaker failure protection of main/tie circuit-breaker operated
14. Tie circuit-breaker R-phase open
15. Tie circuit-breaker Y-phase open
16. Tie circuit-breaker B-phase open
The sequence of digital channels shall be as per above list and
which shall be ensured by the contractor. Digital channels shall be
named suitably for easy identification of signals in the fault
recordings.
29.4. The necessary hardware and software shall also be supplied for the on-
line transfer of data from all acquisition units to the evaluation unit. The
disturbance recording system shall be capable of handling the full
complement of feeders in the substation.
In case of extension of existing substation(s), one set of
Evaluation unit shall be supplied for each substation wherever
required (as per section-Project) along with necessary evaluation
software as specified above.

Tech Specification, Section: CRP Page 34 of 49

C/ENGG/SPEC/CRP REV NO: 09
29.5. The disturbance recording equipment shall be screened, shielded,
earthed and protected as may be required for its safe and proper
functioning. Also, the disturbance recorder shall have stable software,
reliable hardware, simplicity of maintenance and immunity from the
effects of the hostile environment of a 765 kV EHV switchyard which is
prone to numerous interference signals such as large switching
transients.
29.6. The evaluation unit shall comprise all the necessary hardware and
software for the proper evaluation of disturbances. The hardware would
typically consist of a desktop personal computer (including a large high
resolution colour monitor, mouse and keyboard) and a high-speed
colour printer (A4 size). The desktop PC shall have I5 processor or
better and shall have a clock speed of 2.0 GHz or better. The mass
storage capacity of PC shall not be less than 1000GB and the RAM
capacity shall not be less than 4 GB. The evaluation software required
for the analysis and evaluation of the recorded data shall run on the PC
under Microsoft Windows environment. The software features shall
provide:
• clear and unambiguous display of all channels;
• the ability to reposition the analog and digital traces;
• recording of maximum/minimum values etc. of the analog
channels;
• calculation of maximum/minimum frequency and phase
difference values;
• grouping of signals for drawing on the same axis;
• listing and identification of all analog and digital channels as well
as and current, voltage, frequency and phase difference values
at the time of fault/tripping;
• the capability of carrying out Fourier/Harmonic analysis of the
current and voltage waveforms; and,
• the availability of the disturbance records in COMTRADE format
29.7. The evaluation unit shall be permanently connected to the printer so as
to obtain the graphic display of disturbances whenever desired by the
operator. The printer shall be compatible with the desktop PC and shall
use plain paper. The print out shall contain the feeder identity, date and
time (in hour, minute and second up to 100th of a second), identity of
the trigger source and graphic representation of the analog and digital
signals of all the channels.
29.8. The disturbance recorder acquisition units shall be suitable to operate
from the station DC. The evaluation unit along and the printer shall
normally be connected to the 230 V, single phase AC supply. In the
case of a failure of the AC supply, the evaluation unit and printer shall
be automatically switched to the station DC through an inverter of
adequate capacity and which shall form part of disturbance recording
system.

Tech Specification, Section: CRP Page 35 of 49

C/ENGG/SPEC/CRP REV NO: 09
29.9. The disturbance recorder shall be capable of being triggered by the
following user-specified quantities:
(a) external start, both software and hardware
(b) cross triggering of groups of channels, either software or
hardware or both
(c) binary channel (NO and NC contacts)
(d) over voltage and under voltage
(e) over current
(f) negative sequence voltage
(g) zero sequence voltage
(h) rate of change, voltage or current
(i) over frequency or under frequency
(j) logical or Boolean expressions, programmable
(k) power swing
(l) rate of change of active or reactive power
29.10. The disturbance recorder shall have its own time generator and the
clock of the time generator shall be such that the drift is limited to less
than ± 0.5 seconds per day, if allowed to run without synchronisation.
Further, the disturbance recorder shall have the facility to synchronise
its time generator from the station Time Synchronisation Equipment
using IRIG-B. The recorder shall give an alarm in the case of the
absence of the synchronising pulse for a pre-determined time.
30. DISTANCE TO FAULT LOCATOR shall
a. be electronic or microprocessor based type
b. be 'On-line' type
c. be suitable for breaker operating time of 2 cycles
d. have built-in display unit
e. the display shall be directly in percent of line length or kilometres
without requiring any further calculations
f. have an accuracy of 3% or better for the typical conditions defined
for operating timings measurement of distance relays
g. The above accuracy should not be impaired under the following
conditions:
• presence of remote end infeed
• predominant D.C. component in fault current
• high fault arc resistance
• severe CVT transients
h. shall have mutual zero sequence compensation unit if fault locator is
to be used on double circuit transmission line

Tech Specification, Section: CRP Page 36 of 49

C/ENGG/SPEC/CRP REV NO: 09
 i. built in feature of line distance relay is acceptable provided the
requirements of above clauses are met.

31. DISTANCE TO FAULT LOCATOR-Travelling Wave type (TWFL):

Distance to Fault locator, based on Traveling wave detection method, shall
a. be microprocessor based, On-line type
b. have programmable triggering thresholds
c. be suitable for breaker operating time of minimum 2 cycles
d. consist of acquisition unit and one central unit
e. provide fault location reading directly in kilo-meter without requiring any
further calculations
f. have fault location accuracy of + 150 Meter or better with a least count
of atleast 50 meter for fault locator readings
g. The above accuracy should not be affected by followings:
• Line length
• Presence of remote end in-feed
• Series compensation
• Non-uniform line (having Cable & Over head line both)
• Mutual coupling
• Transposition of line
• Fault resistance
• Severe CVT transients
h. Acquisition units shall:
i. be either standalone for each line
or
with the capability to cater to a number of lines emanating from a
substation. Incase more than one lines are to be accommodated in
one acquisition unit then suitable coupler unit/measuring unit shall
be provided in individual line bay C&R panels and only secondary
wiring shall be brought to common acquisition unit. While offering
this option, bidders are advised to take care of maximum distance
between Acquisition unit & line bays C&R panels. In the BPS, total
no. of line bays envisaged for Travelling Wave type Fault Locators
is mentioned for further assessment by the bidder for no. of
Acquisition units required for total functional requirements based on
equipment design.

ii. include all required accessories (like couplers, cables, connectors

etc) to connect to the secondary wiring of the Instrument
transformers (in C&R panels) for detection of traveling wave

iii. have built-in backlit display unit and keypad

Tech Specification, Section: CRP Page 37 of 49

C/ENGG/SPEC/CRP REV NO: 09
 iv. have the facility to locally download the data in case of
communication failure

v. have minimum 02 nos. binary input per line for line protection trip
input. Binary input shall be rated for 220V DC and it shall be
possible to set the de-bounce time of the binary input.

vi. have minimum 1GB of storage space

vii. have facility to transmit the fault record to the Central unit by dialing
mode, IEC60870-5-103 or IEC60870-5-104 or TCP/IP net protocol
etc. Scope shall include dialup modem, if required with each
Acquisition unit.

i. include required GPS time synchronizing units for each substation

(internal or external to Acquisition unit)

j. Central data processing unit shall:

i. Consist of a desktop personal computer (including at least 17” TFT

color monitor, mouse and keyboard), colour laser jet multi-function
printer (A4 size), LAN switches (as required), all special cables
and other required accessories. The desktop PC shall have Intel
Dual core processor or better. The hard disk capacity of PC shall
not be less than 1000 GB and RAM capacity shall not be less than
4 GB.

ii. have all necessary hardware & software for data download from
Acquisition units, storage, processing, device (acquisition unit)
creation and configuration, and comprehensive viewer for manual
analysis of waveform. It will also have diagnostic feature to check
the healthiness of connected devices & communication link.

iii. calculate & report the fault location based on the traveling wave
data acquired from acquisition units of both end of the line.
However, Central data processing unit shall have the facility to
calculate the fault location even with only one end acquisition unit
data of the line.

iv. be able to communicate to the Master station (Control centre)

through IEC60870-5-104 net protocol. Alternate Standard protocol
shall also be acceptable subject to fulfilling the functional
requirements.

v. be located at local or any remote end based on the availability of

communication link. End to end communication link shall be

Tech Specification, Section: CRP Page 38 of 49

C/ENGG/SPEC/CRP REV NO: 09
 provided by POWERGRID. However Scope shall also include a
dialup modem with central data processing unit.

k. In cases, Central data processing unit of Travelling wave fault locator is

existing at a location the Acquisition units under present scope can be
integrated with the existing Central data processing unit (Make & Model
of existing unit should be mentioned in section-Project) by required
augmentation (configuration and up gradation of data base including
supply of any additional hardware / software etc.). Alternatively, bidder
may offer separate Central data processing unit & associated hardware
& software as may be required under the head of augmentation of
Central data processing unit.
l. Include required no. of panels to house the offered equipments at
various substations & central location. Acquisition units can also
be mounted in respective line protection panels.
m. TWFL as built-in feature of Standalone fault recorder or Line
Protection IED shall also be acceptable subject to meeting the
functional requirement specified.
n. Type test (EMI/EMC) and additional functional test for accuracy
shall be submitted for TWFL for review and approval.

32. TIME SYNCHRONISATION EQUPMENT

32.1. The Time synchronisation equipment shall receive the co-ordinated
Universal Time (UTC) transmitted through Geo Positioning Satellite
System (GPS) and synchronise equipments to the Indian Standard
Time in a substation.
32.2. Time synchronisation equipment shall include antenna, all special
cables and processing equipment etc.
32.3. It shall be compatible for synchronisation of Event Loggers, Disturbance
recorders and SCADA at a substation through individual port or through
Ethernet realised through optic fibre bus.
32.4. Equipment shall operate up to the ambient temperature of 50 degree
centigrade and 80% humidity.
32.5. The synchronisation equipment shall have 2 micro-second accuracy.
Equipment shall give real time corresponding to IST (taking into
consideration all factors like voltage, & temperature variations,
propagation & processing delays etc).
32.6. Equipment shall meet the requirement of IEC 60255 for storage &
operation.
32.7. The system shall be able to track the satellites to ensure no interruption
of synchronisation signal.
32.8. The output signal from each port shall be programmable at site for
either one hour, half hour, minute or second pulse, as per requirement.
32.9. The equipment offered shall have six (6) output ports. Various
Tech Specification, Section: CRP Page 39 of 49
C/ENGG/SPEC/CRP REV NO: 09
 combinations of output ports shall be selected by the customer, during
detailed engineering, from the following :
• Potential free contact (Minimum pulse duration of 50 milli
Seconds.)
• IRIG-B
• RS232C
• SNTP Port
• IEEE 1588 PTP (Applicable only for Process bus automation
station)
32.10. The equipment shall have a periodic time correction facility of one
second periodicity.
32.11. Time synchronisation equipment shall be suitable to operate from 220V
DC or 110V DC as available at Substation.
32.12. Equipment shall have real time digital display in hour, minute, second
(24 hour mode) & have a separate time display unit to be mounted on
the top of control panels/SAS panel having display size of approx. 100
mm height.
33. Bay Control Unit (BCU): BCU supplied shall meet the requirements
mentioned under technical specification Section- Substation
automation.
34. INTERFACE PANEL ( If specified in BPS)
a) Interface panel is envisaged to minimize cabling/termination time during
erection stage at site, minimize hindrance in protection panel and also
ease of trouble shooting. This panel shall be installed in Switchyard panel
room and one no. interface panel shall be provided for each feeder. Tie
bay can be accommodated in the Interface unit of any one of the
associated feeder.
b) All control wiring from switchyard except CTs & CVTs shall be terminated
in the interface panel. CTs and CVTs wiring shall be directly connected to
the relay panel as per scheme requirements.
c) All wiring from Interface panel to relay panels or other panels (Inter-panel
wiring) in the switchyard panel room shall be factory fitted / terminated
through Plug-in type termination arrangement. Plug-in type termination
shall be heavy duty industrial grade with double locking latch or screw
locking arrangement with IP65 protection.
d) Minimum one number spare Plug-in type connector duly terminated
on each side per inter-panel wiring circuit shall be provided for
future use.
35. MONITORING, CONTROL & PROTECTION FOR AUXILIARY
TRANSFORMER
Suitable monitoring, control (operation of associated circuit breaker & isolator)
and protection for LT auxiliary transformer, connected to tertiary winding of
auto transformer for the purpose of auxiliary supply shall be provided by the

Tech Specification, Section: CRP Page 40 of 49

C/ENGG/SPEC/CRP REV NO: 09
 contractor. Over current and open delta protection is required to be provided
for the auxiliary transformer. These protection and control shall be also be
acceptable as built in feature either in the bay controller to be provided for the
auxiliary system or in the control & protection IEDs to be provided for
autotransformer.
36. RELAY Test KIT
36.1. One relay test kit shall comprise of the following equipment as detailed here
under
3 sets Relay tools kits
2 nos. Test plugs for each type of TTB
2 nos. Test plugs for using with modular type relays (if
applicable)
37. CONFIGURATION OF RELAY AND PROTECTION PANELS
The following is the general criteria for the selection of the equipments to be
provided in each type of panel. However, contractor can optimise the
requirement of panels by suitably clubbing the feeder protection and CB relay
panels. It may be noted that Main-I and Main-II protections for line can not be
provided in single panel. Similarly, Group-I & Group-II protections for
transformer can not be provided in single panel.
I) LINE PROTECTION PANEL: The Line Protection panel for transmission
lines shall consist of following protection features/schemes

Sl. No. Description 765kV 400kV 220kV 132kV

1. Main-1 protection scheme 1 Set 1 Set 1 Set 1 Set
2. Main-2 protection scheme 1 Set 1 Set 1 Set NIL*
3. Over Voltage Protection 1 Set 1 Set NIL NIL
Scheme
4. Fault Recorder 1 Set 1 Set 1 Set NIL
5. Standalone Disturbance 1 Set NIL NIL NIL
Recorder
6. Distance to fault Locator 1 Set 1 Set 1 Set 1 Set
7. Cut out for mounting of 1 Set# 1 Set# NIL NIL
Distance to fault Locator
(TWFL)
8. 3 Phase Trip Relays 2 Nos. 2 Nos. 2 Nos. 2 Nos.
9. Flag relays, carrier receive As As As As
relays, aux. Relays, timers etc required required required required
as per scheme requirements
10. Under Voltage protection relay 2 Nos 2 Nos 2 Nos 2 Nos
for isolator/earth switch
Interlock

Tech Specification, Section: CRP Page 41 of 49

C/ENGG/SPEC/CRP REV NO: 09
 Sl. No. Description 765kV 400kV 220kV 132kV
11. . Cut-out and wiring with TTB for 1 Set 1 Set 1 Set 1 Set
Employer supplied energy
meter
12. Directional Back up Over NIL NIL NIL 1 Set
current and E/F protection
scheme
Note- 1) *Back up –directional O/c & E/F protection is specified for 132kV
system in place of Main-II
Note- 2) In a substation where 765kV, 400kV and 220 KV lines are under the
scope of the contract, bidder is required to give identical Main-1 and
Main-2 distance protection schemes for all voltage levels.
Note- 3) Cut out & mounting arrangement provided for POWERGRID supplied
energy meter shall be suitable for mounting of energy meter unit of 4”
thickness
Note-IV # Cut out for mounting of Distance to Fault locator (Travelling
wave type) shall be provided.

II) TRANSFORMER PROTECTION PANEL: The protection panel for Auto

transformer/Transformer shall consists of the following features/schemes:

Sl. No. Description HV side MV/LV

side
1. Transformer Differential Protection scheme 1 Nos. Nil
2. Restricted Earth fault protection scheme 1 no. 1 no@
@ Not applicable for auto-transformer
3. Directional back up O/C and E/F relay with 1 set 1 set
non-directional high set feature
4. Over Fluxing Protection scheme 1 no. 1 no.$
$ Applicable only for 400/220kV Transformer & 765/400kV
Transformer

Tech Specification, Section: CRP Page 42 of 49

C/ENGG/SPEC/CRP REV NO: 09
 5. Overload protection scheme 1 nos. NIL
6. Three phase trip relays 2 nos. 2 nos.
7. CVT selection relays as per scheme Lot Lot
requirement
8. Cut-out and wiring with TTB for POWERGRID 1 set 1 set
supplied energy meter
9. Transformer Neutral Current relay for 1- 1 Set
Phase transformer bank
10. Tertiary side O/C and Open delta Voltage 1 Set
protection
11. Flag Relays/Aux. Relays for wiring As required
Transformer auxiliary protection contacts
such as Buchholz, Oil Temperature, Winding
Temperature, PRV, SPRD, OLTC Buchholz
etc. as per scheme requirements
Note- 1) Tertiary side protections, over fluxing protection and overload
protection can be clubbed in other transformer protection relay,
however, over fluxing protection of HV and MV/LV side cannot
be clubbed together. Further, tertiary side protection, if provided
in auxiliary BCU, shall be excluded from this panel.
This protection shall be applicable only for the transformer
whose tertiary side is connected to LT transformer for station
auxiliary supply.
Note- 2) Cut out & mounting arrangement provided for POWERGRID supplied
energy meter shall be suitable for mounting of energy meter unit of 4”
thickness

III) REACTOR PROTECTION PANEL: The protection panel for Reactor shall
consist of the following features/schemes:

Sl. No. Description Qty.

1. Reactor Differential Protection scheme 1 no.
2. Restricted Earth fault Protection scheme 1 no.
3. Reactor back up impedance protection scheme 1 set
4. Three phase trip relays 2 nos.
5. CVT selection relay as per scheme requirement Lot
6. Flag Relays/Aux. Relays for wiring Reactor auxiliary As
protection contacts such as Buchholz, Oil Temperature, required
Winding Temperature, PRV, SPRD etc. as per scheme
requirements

Tech Specification, Section: CRP Page 43 of 49

C/ENGG/SPEC/CRP REV NO: 09
 IV) BREAKER RELAY PANEL: The breaker relay panel shall consist of the
following:

Sl. No. Description With A/R Without A/R

1. Breaker failure Protection Scheme * 1 No. 1 No.
2. DC supply Supervision relay 2 Nos. 2 Nos.
3. Trip Circuit supervision relays# 6 Nos. 6 Nos.
4. Auto-reclose scheme (if standalone) 1 Nos. NIL
5. Flag relays, aux relays, timers, trip As required As required
relays as per scheme requirements
Note- 1) # Trip supervision relays shall be 2 or 6 numbers as per no. of trip
coils for each 132KV Circuit breaker
Note- 2) Equipment/relays to be provided under CB Relay Panel may be
accommodated in the Protection Panels to be provided for
Transmission Line/Transformer/Reactor as applicable.
Note- 3) * In case of bay extension in existing half diameter, breaker failure relay
for main CB / Tie CB shall be supplied only if BFR built-in Bus Bar
protection bay unit is not available or Tie CB standalone BFR relay is
not available in the existing protection scheme.

V) CONTROL PANEL: Various types of control panels shall consist of the

following:

a. Ammeter 3 set for each Line, BC, TBC Bus

section, Bus Reactor and
Transformer
b. Ammeter with Selector 1 set for each line reactor
switch
c. Wattmeter with transducer 1 set for each line, transformer
d. Varmeter with transducer 1 set for each line, transformer, Bus
reactor
e. Varmeter with transducer 1 set for each Line Reactor
f. CB Control switch 1 no. for each Circuit breaker
g. Isolator Control switch 1 no. for each isolator
h. Semaphore 1 no. for each earth switch
i. Red indicating lamp 1 no. for each Circuit breaker
j. Red indicating lamp 1 no. for each isolator
k. Green indicating lamp 1 no. for each Circuit breaker
l. Green indicating lamp 1 no. for each isolator

Tech Specification, Section: CRP Page 44 of 49

C/ENGG/SPEC/CRP REV NO: 09
 m. White indicating lamp 2 nos. for each feeder
(DC healthy lamp)
n. Annunciation windows with 18 for each feeder
associated annunciation nos.
relays
o. Push button for alarm 3 nos. for each control panel
Accept/reset/lamp test
p. Synchronising Socket 1 no. for each Circuit Breaker,
if required
q. Synchronising selector 1 no. for each Circuit Breaker
Switch switch,
if required
r. Protection Transfer Switch 1 no. for each breaker in case of
DMT /DM with bypass isolator
/ SMT schemes (Except TBC
and BC breaker)
s. Mimic to represent SLD Lot in all control panels
t. Voltmeter with selector 1 no. for each line, transformer, bus
Switch reactor
u. Cut out, mounting and wiring Lot for transformers/reactors
for RWTI and selector switch
Notes:
1 For transformer feeders, all equipments of control panel shall be provided
separately for HV and MV sides.
2. In case of incomplete diameter (D and I type layouts), control panel shall
be equipped fully as if the diameter is complete, unless otherwise
specified. Annunciation relays shall also be provided for the same and if
required, necessary panel shall be supplied to accommodate the same.
3. The above list of equipments mentioned for control panel is generally
applicable unless it is defined elsewhere and in case of bay extension in
existing substations, necessary equipments for matching the existing
control panel shall be supplied.
4. Each line /HV side of transformer/MV/LV side of transformer /Bus reactor
/TBC /Tie / BC/ Bus Section shall be considered as one feeder for above
purpose.

VI) CONTROL PANEL WITH BAY CONTROL UNIT (BCU): Various types of
control panels shall consist of the following:

a. Bay Control Unit (BCU) 1 set for each Circuit Breaker

Tech Specification, Section: CRP Page 45 of 49

C/ENGG/SPEC/CRP REV NO: 09
 b. Ethernet switch complying 1 no. for each control panel
IEC61850
c. Selector switch for 1 no. for each Circuit Breaker
Local/Remote bay control
d. Ammeter with transducer & 1 set for each Line, BC, TBC, Bus
Selector switch section, Bus reactor,
Transformer and line reactor
e. CB Control switch 1 no. for each Circuit breaker
f. Red indicating lamp 1 no. for each Circuit breaker
g. Green indicating lamp 1 no. for each Circuit breaker
h. White indicating lamp 2 nos for each feeder
(DC healthy lamp)
i. Common Annunciation lamp 1 no. for each control panel
j. Common hooter 1 no. for each control panel
k. Synchronising Socket 1 no. for each Circuit Breaker if
required
l. Synchronising selector Switch 1 no. for each Circuit Breaker
switch if required
m. Protection Transfer Switch 1 no. for each breaker in case of
DMT /DM with bypass
isolator/ SMT schemes
(Except TBC and BC
breaker)
n. Mimic to represent SLD Lot in all control panels
o. Voltmeter with selector Switch 1 no. for each line, transformer,
bus reactor
Notes:
1 For transformer feeders, all equipments of control panel shall be
provided separately for HV and MV sides.
2. In case of incomplete diameter (D and I type layouts), control panel
shall be equipped fully as if the diameter is complete, unless otherwise
specified. Annunciation relays shall also be provided for the same and
if required, necessary panel shall be supplied to accommodate the
same.
3. The above list of equipments mentioned for control panel is generally
applicable unless it is defined elsewhere and in case of bay extension
in existing substations, necessary equipments for matching the existing
control panel, if applicable, shall be supplied.
4. Each line /HV side of transformer/MV/LV side of transformer /Bus
reactor /TBC /BC/ Bus Section shall be considered as one feeder for
above purpose.

Tech Specification, Section: CRP Page 46 of 49

C/ENGG/SPEC/CRP REV NO: 09
 6. Control panel with BCU can be combined in the CB relay panels
being supplied under present scope.
7. The Bay Control unit and the numerical relays supplied under present
scope shall be connected to the Ethernet switch. The ethernet switch
shall comply with IEC 61850-3 requirements. It shall have sufficient
number of ports to accommodate all the IEDs of the new bays and at
least 6 spare ports for integrating the numerical Relays/BCUs with
NTAMC system i.e. redundant Gateways/RTU and redundant SDC and
two spare ports. The IP addressing scheme for the devices shall be
provided by POWERGRID.
9. Selector switch for Local/Remote bay control shall be provided to
transfer the control between the BCU and the Control panel. The
control shall be available to either the BCU or from the Control panel
however data monitoring shall be available at both the devices
10. The Bay control unit shall be flush mounted in the panel with their
mimic displays accessible from the front of the panel. The Bay control
unit mimic shall dynamically represent the current value of the
measurements, state of the devices and control of devices. The Bay
control unit shall provide telemetry and tele-control for remote
operation from control centres (NTAMC). The Bay control unit shall
acquire all the analog measurements, Status of Circuit breakers,
Isolators and Earth switches, status of alarms, and provide Control of
devices (Circuit breaker/Isolators/Reset of Relays/position selection for
Auto reclose etc). The Bay control unit shall also provide
synchronization check facility for the circuit breakers suitable for the
bus bar scheme.
11. For Protection transfer switch function in Transfer bus schemes- The
High Speed Bi-stable relays for protection transfer from ‘Normal’ to
‘Transfer’ and vice versa, whose position can be controlled locally as
well as from remote via BCU shall be provided. The position once
selected should not change in case of Power cycling.
12. In case the control panel is being provided in switchyard panel room,
its common alarm signal shall also initiate an alarm facia in any of the
existing control panel in control room building.

38. ERECTION AND MAINTENANCE TOOL EQUIPMENTS

All special testing equipment required for the installation and maintenance
of the apparatus, instruments devices shall be furnished in relevant
schedule.
39. TROPICALISATION
Control room/ Panel room will be normally air-cooled/air- conditioned. All
equipments shall however be suitable for installation in a tropical monsoon
area having hot, humid climate and dry and dusty seasons with ambient
conditions specified in the specification. All control wiring, equipment and
accessories shall be protected against fungus growth, condensation,
vermin and other harmful effects due to tropical environment.

Tech Specification, Section: CRP Page 47 of 49

C/ENGG/SPEC/CRP REV NO: 09
40. TYPE TESTS
40.1. The reports for following type tests shall be submitted during detailed
engineering for the Protective relays, Fault Recorder, Fault locator and
Disturbance recorder:
a) Insulation tests as per IEC 60255-5
b) DC Voltage dips and interruptions/Variation as per IEC 61000-4-29
or IEC 60255-11
c) High frequency (1MHz burst) disturbance test as per IEC 60255-
22-1 (Not applicable for electromechanical relays)
d) Electrostatic discharges as per IEC 61000-4-2, level; 4 or IEC
60255-22-2 with severity Class III (not applicable for
Electromechanical relays)
e) Fast transient test as per IEC 61000, Level IV or IEC 60255-22-4
with severity level IV (Not applicable for electromechanical relays)
f) Relay characteristics, performance and accuracy test as per IEC
60255
• Steady state Characteristics and operating time
• Dynamic Characteristics and operating time for distance
protection relays and current differential protection relays
• Conformance test as per IEC 61850-10.
For Fault recorder, Disturbance recorder; only performance tests
are intended under this item.
g) Tests for thermal requirements as per IEC 60255-6
h) Tests for rated burden as per IEC 60255-6
i) Contact performance test as per IEC 60255-0-20 or IEC61810-2
(not applicable for Distance to fault locator and Disturbance
recorder)
j) Tests for mechanical requirements ( Vibration, shock & bumps
and seismic) as per IEC 60255-21-1, 2 & 3 with severity class-I
k) Test for Radiated Electromagnetic Field Disturbance as per IEC
60255-22-3 with severity class III (not applicable for
electromechanical relays)
In case there is a change either in version or in model (Except firmware) of
the relay, the contractor shall submit the type test reports for the offered
revision/model.
40.2. Steady state & Dynamic characteristics test reports on the distance
protection relays, as type test, shall be based on test programme specified
in Appendix A on simulator/network analyser/PTL. Alternatively, the files
generated using Electromagnetic transient Programme (EMTP) can also be
used for carrying out the above tests. Single source dynamic tests on
transformer differential relay shall be/ should have been conducted based
on general guidelines specified in CIGRE committee 34 report on

Tech Specification, Section: CRP Page 48 of 49

C/ENGG/SPEC/CRP REV NO: 09
 Evaluation of characteristics and performance of Power system protection
relays and protective systems.

41. Other general requirement for Protection IEDs:

a. Relay setting template (in editable document format) shall be provided
by the contractor for each typical protection IEDs for relay setting
purpose.
b. POWERGRID has standardised binary input/output details, indication
details, DR signals texts etc. of protection IEDs & Protection Panels
CT/VT circuit termination detail and same shall be provided to
contractor during detail engineering for preparation of schematics.
Panel nomenclature, terminal blocks identification, as applicable, shall
be according to typical detail given at APPENDIX-B.
42. Requirement for GIS substations:
GIS Gas zone trip signals, if provided, for each gas tight compartments
(gas zone) in the GIS LCC shall be integrated in the protection
schematics to provide electrical isolation of faulty Gas zone by tripping/
inter-tripping its adjacent circuit breakers. The scheme shall be
implemented through protection IEDs and auxiliary relay as required.

Tech Specification, Section: CRP Page 49 of 49

C/ENGG/SPEC/CRP REV NO: 09
 APPENDIX-A

Test programme for distance relays

General Comments:
1. These test cases are evolved from the report of working group 04 of study committee 34
(Protection) on evaluation of characteristics and performance of power system protection
relays and protective systems. For any further guidelines required for carrying out the tests,
reference may be made to the above document.
2. The test shall be carried out using network configuration and system parameters as shown
in the figure-1
3. All denotations regarding fault location, breakers etc are referred in figure –1
4. The fault inception angles are referred to R- N voltage for all types of faults
5. The fault inception angle is zero degree unless otherwise specified
6. Where not stated specifically, the fault resistance (Rf) shall be zero or minimum as possible
in simulator
7. Single pole circuit breakers are to be used
8. The power flow in double source test is 500 MW
System parameters
System voltage =400KV
CTR= 1000/1
PTR = 400000/110 (with CVT, the parameters of CVT model are shown in figure –2)

RELAY

C1 CVT C3

CT CT
XSA
XSB
C2 C4
SOURCE 1
BUS 1 S OURCE 2
BUS 2

FIGURE 1

Line parameters/km
Positive Sequence Resistance, (r1) = 0. 02897 Ω
Positive Sequence Reactance (x1) = 0.3072 Ω
Zero Sequence Resistance (r0) = 0.2597 Ω
Zero Sequence Reactance (x1) = 1.0223 Ω
Zero Sequence Mutual Resistance (rm) = 0.2281 Ω
Zero Sequence Mutual Reactance (xm) = 0.6221 Ω
Zero Sequence succeptance (bo) = 2.347 µ mho
Positive Sequence succeptance (b1) =3.630 µ mho

Tech Specification, Section: Control and Relay Panels Page 1 of 1

C/ENGG/SPEC/CRP REV NO: 09
 APPENDIX-A

Type of line Short Long

Secondary line impedance 2Ω 20 Ω*
Length of line in Kms 23.57 235.7
SIR 4 15 4
Source impedance (pry) (at a 29.09 Ω 109.09 Ω 290.9 Ω
time constant of 50 ms)
(5500 (1467 MVA) (550 MVA)
MVA)

* Alternatively, the tests can be done with 10 Ω secondary impedance and source impedance
may accordingly be modified

CVT Model

C1
TUNING CIRCUIT ( Rl , Ll) DAMPING CIRCUIT (Ra ,La)

C2

LOAD(Rc)
CAPACITIVE DIVIDER
INTERMEDIATE TRANSFORMER

Figure-2

XC1 1.455 µ mho

XC2 27.646 µ mho
Rl 320 Ω
XLl 34243 Ω
Ra 4.200 Ω
Xla 197.92 Ω
Rc 14.00 Ω
Transformation ratio of 181.8
Intermediate transformer

Tech Specification, Section: Control and Relay Panels Page 2 of 1

C/ENGG/SPEC/CRP REV NO: 09
 APPENDIX-A

Details of fault cases to be done

Sl Description Single source with short line Single Double Double

n source long source with source with
(2 Ω )
o line (20 Ω) short double long single
line (2 Ω) line (20 Ω)
CLOSE C1, OPEN C2,C3,C4 CLOSE C1, CLOSE C1, CLOSE C1,C3
OPEN C2,C3,C4
OPEN C2,C4
C2,C3,C4
SIR=4 SIR=15 SIR =4 SIR = 4 SIR=4
1 Dynamic Tests to be Tests to be Tests to be Tests to be
accuracy for done at 2 done at 2 done at 2 done at 2
zone 1 locations ( 84 locations ( 84 locations ( 84 locations (84%
% and 76 % % and 76 % % and 76 % and 76% of
of line length ) of line length ) of line length line length) X
X 4 faults X 4 faults ) X 4 faults 4 faults (RN ,
(RN , YB, (RN , YB, (RN , YB, YB, YBN,
YBN, RYB) YBN, RYB) YBN, RYB) RYB) X 2
X 2 fault X 2 fault X 2 fault fault inception
inception inception inception angle
angle angle angle
(0°, 90°)= 16
(0°,90°)= 16 (0°,90°)= 16
(0°, 90°)= 16 cases
cases cases
cases
2 Operating Tests to be Tests to be Tests to be Tests to be Tests to be
time for done at 3 done at 3 done at 3 done at 1 done at 1
zone 1 at locations (0% locations (0 % locations ( 0 location (40 % location (40 %
SIR =4 , 40% and , 40 % and % , 40 % of line length) of line length )
64% of line 64 % of line and 64 % of X 4 faults X 4 faults
length ) X 4 length ) X 4 line length ) (RN, YB, (RN, YB, YBN,
faults (RN, faults (RN , X 4 faults YBN, RYB) X RYB) X 4
YB, YBN, YB, YBN, (RN , YB, 4 fault fault inception
RYB) X 4 RYB) X 4 YBN, RYB) inception angle
fault inception fault inception X 4 fault angle (0°,30°,60°
angle angle inception and 90°)=
(0°,30°,60°
angle 16cases
(0°, 30°,60° (0°,30°,60°an and 90 °)= 16
and 90°) = 48 d 90°)= 48 (0°, 30°,60° cases
cases cases and 90°)= 48
cases

3 Operating Tests to be Tests to be Tests to be

time for done at 1 done at 1 done at 1
zone II and location ( 100 location (100 location (100
Zone III % of line % of line % of line
length ) X 1 length) X 1 length ) X 1
faults (RN, faults (RN , faults (RN ,
YB, YBN, YB, YBN, YB, YBN,
RYB) X 2 RYB) X 2 RYB) X 2
zones (II and zones (II and Zones (II and
III) = 2 cases III) = 2 cases III) = 2 cases

Tech Specification, Section: Control and Relay Panels Page 3 of 1

C/ENGG/SPEC/CRP REV NO: 09
 APPENDIX-A

Sl Description Single source with short line Single Double Double

n source long source with source with
(2 Ω )
o line (20 Ω) short double long single
line (2 Ω) line (20 Ω)
4 Switch on to Tests to be
fault feature done at 2
location ( 0
% and 32
%) X 1 faults
(RYB) Any
fault
inception
angle = 2
cases
5 Operation Tests to be
during done at 2
current location (0 %
reversal and 80 % of
line length ) X
1 faults ( RN)
X 1 fault
inception
angle (0
degrees) = 2
cases
CLOSE C1, OPEN C2,C3,C4 CLOSE C1, CLOSE C1, CLOSE C1,C3
OPEN C2,C3,C4
OPEN C2,C4
C2,C3,C4
SIR=4 SIR=15 SIR =4 SIR = 4 SIR=4
6 Operation at Tests to be
simultaneou done at 2
s faults location (8 %
and 64 % of
line length ) X
2 faults ( RN
in circuit 1 to
BN in circuit 2
and RN in
circuit 1 to
RYN in circuit
2 in 10 ms)
X 1 fault
inception
angle ( 0 °) =
4 cases (*1)
7 Directional Tests to be
sensitivity done at 1
location (0%
reverse) X 6
faults ( RN

Tech Specification, Section: Control and Relay Panels Page 4 of 1

C/ENGG/SPEC/CRP REV NO: 09
 APPENDIX-A

Sl Description Single source with short line Single Double Double

n source long source with source with
(2 Ω )
o line (20 Ω) short double long single
line (2 Ω) line (20 Ω)
,YB, YBN ,
RYB,RN with
Rf=13.75
ohm(sec) and
RYN with Rf=
13.75 Ohm
(sec) X 2
fault inception
angle (0° ,90°
) = 12cases
8 Limit for Tests to be
fault done at 2
resistance location ( 0%
and 68 % of
line length) X
1 fault ( RN
with Rf=13.75
ohm(sec) X
2 fault
inception
angle (0°,90° )
= 4 cases
9 Operation at Tests to be
evolving done at 2
faults location (32 %
and 0% of line
length) X 2
faults (RN to
RYN) x in 2
timings (10 ms
and 30 ms) X
2 load
direction (from
A to B and
from B to A) =
16 cases
9 Fault locator Measure fault Measure Measure Measure Measure fault
function , in location for all fault location fault location fault location location for all
case the cases under 1 for all cases for all cases for all cases cases under 2,
same is and 2 under 1 and under 1 and under 2 and 6 7 and 9
offered as 2 2
built in
feature

Tech Specification, Section: Control and Relay Panels Page 5 of 1

C/ENGG/SPEC/CRP REV NO: 09
 APPENDIX-B

Terminal Block (TB) Nomenclature for Relay & interface panels

TB for external TB for Interpanel

Circuit type connections connections
CT X:CT XI:CT
PT X:VT XI:VT
AC Auxiliary X:AC XI:AC
DC Auxiliary X:DC XI:DC
Trip Circuit 1 X:TC1 XI:TC1
Trip Circuit 2 X:TC2 XI:TC2
LBB & BB X:LBB XI:LBB
CB X:CB/X:CBT XI:X
ISOLATOR X:ISA/ISB/ISL/ISR XI:X
EARTH SWITCH X:ES XI:X
PROTECTION COUPLER X:PC XI:PC
ENERGY METER X:EM ---
Reactor X:SR XI:SR
Transformer X:AT XI:AT
Others Control & status signals X:X XI:X

Feeder relay Panels designation:

Typical Bay / Busbar Panel Ref.
765kV Bay no. 1 (701) 7R1A, 7R1B and so on
400kV Bay no. 1 (401) 4R1A, 4R1B and so on
220kV Bay no. 1 (201) 2R1A, 2R1B and so on
132kV Bay no. 1 (101) 1R1A, 1R1B and so on
Bus 765kV 7BB1, 7BB2 and so on
Bus 400kV 4BB1, 4BB2 and so on
Bus220kV 2BB1, 2BB2 and so on
Bus132kV 1BB1, 1BB2 and so on

Tech Specification, Section: Control and Relay Panels Page 1 of 1

C/ENGG/SPEC/CRP REV NO: 09
 SECTION: PLCC

1. GENERAL

1.1 All the PLCC equipment covered under the package shall conform to the
requirements of the latest edition of the relevant IEC/IS Specifications or
equivalent National Standards,

2. Standard And Drawing

2.1 The IEC/IS Specifications and international publication relevant to the

equipment covered under this specification shall include but not be limited to the
list given at Annexure - 'C' of Section - GTR:

3. Location of Equipment

3.1 The PLCC Equipment and Line traps as specified shall be installed at the respec-
tive ends of the transmission lines. The Contractor shall be responsible for
coordinating the equipment supplied by him with the already existing carrier
equipment at the respective sub-stations. Contractor shall also be responsible for
collecting all the necessary information/data from the respective sub-
stations/concerned State Electricity Boards for the installation of the equipment.

4. Frequency Planning

4.1 For planning frequency and output power of carrier terminals Bidders may plan
for a minimum receive signal to noise ratio of 25 dB for the speech channels
without companders. The noise power in 2.1 kHz band (300-2400 Hz) may be
taken as -13 dBm referred to the coupling point of the H.T. line. An additional
minus two and a half dB may be assumed for psophometric factor. As far as
coupling loss (phase to phase) is concerned the Bidders may assume the same as
6dB at one coupling end for evaluating SNR. For protection channels the
minimum SNR shall not be less than 15 dB under adverse weather. A safety
margin of 9 dB shall be taken over and above these SNR values in order to cater
for variations in line attenuation from the computed value as inhand reserve.
Frequency and output power of PLC terminals for protection shall be planned
such that the protection signal is received with full reliability even when one of
the phase is earthed or is on open circuit on the line side causing an additional
minimum loss of 6 dB.

The Bidder shall indicate the noise power in the bandwidth used for protection
signaling and shall submit the SNR calculations for speech as well as protection
channels on all the line section given in at the proposed frequencies. Sample
calculations for SNR requirement and power allocation over different channels

Tech Specification, Section : PLCC Page 1 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 must be furnished alongwith the bid. Maximum permissible line attenuation shall
be clearly brought out in these calculations. Further, Bidder shall submit details of
frequency planning done (including computer studies carried out and facilities
available) for PLCC links on EHV lines in the past in the relevant schedule of
DRS. Bidder must enclose one copy of computer study result done in the past
along with the Bid.

4.2 Successful Bidder shall be fully responsible for the coordination required with
concerned State Electricity Boards for finalising the frequency plan.

4.3 The frequency plan will be referred to wireless Adviser/DOP Department for
clearance and in case any change in the Contractor’s recommended carrier
frequency and power output is proposed by these authorities, the Contractor shall
have to modify his proposal accordingly. Change of power output shall, however,
not involve repeater stations.

5. Proposed Arrangement

5.1 The power line carrier communication equipment required by the OWNER is to
provide primarily efficient, secure and reliable information link for carrier aided
distance protection and direct tripping of remote-end breaker and also for speech
communication between 765/400/220 kV sub-stations. It shall include separate
carrier terminals of multipurpose type for speech and protection purposes. All
carrier terminals including those for protection shall be suitable for point to point
speech communication also.

5.2 For security reasons each 765/400/220kV transmission line shall be protected by
Main-I and Main-II protections as given below :

Main-I Numerical Distance protection with permissive inter-tripping.

Main-II Distance protection of a different measuring technique than that

of relay under Main I.

132kV transmission lines shall have Main I protection same as above alongwith
backup overcurrent and earth fault protections.

5.3 The requirement of carrier information on each link covered under this
specification is as below :

a) One protection channel for Main-I and another for Main-II distance
protection schemes. Further these channels will also be used as main and
back-up channel for direct circuit breaker inter-tripping for 765kV/ 400kV
lines.

Tech Specification, Section : PLCC Page 2 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 In case of 400KV/220 KV/132 KV lines ,speech and data channel can also
be used for protection wherever possible.
b) One speech channel with a facility to superimpose data signals upto
1200Baud.
However, the number of channels for protection signaling , speech and
data communication for SAS and Load dispatch centre shall be as per the
BOQ given in price schedule.

5.4 The equipment for protection signals shall have high degree of reliability and
speed. It shall be guaranteed to function reliably in the presence of noise impulse
caused by isolator or breaker operation. The equipment shall be suitable for direct
tripping of remote end breaker for fault in unswitched 765kV/400 kV Shunt
Reactor & Operation of Buchholz relays of reactor etc. It shall also be possible to
effect direct tripping of breaker at one end when the other end breaker opens out
either manually or by relays such as Bus fault relay etc.

5.5 The time intervals between receipt of a trip command on the transmit side, its
transmission over the carrier link, reception at the far end and giving command to
the trip relays at the distant end shall not exceed 20 mS. for permissive inter-
tripping and 30 m sec. for direct inter-tripping even for the longest line section.
The above timings are inclusive of operating time for auxiliary relays and
interposing relays, if any, included in the PLCC equipment.

5.6 The requirement of protection signaling channel is such that security against
incorrect signals being received shall be at least two to three orders higher than
reliability against a signal not being received.

5.7 For reasons of security and reliability, phase to phase coupling for 765kV/400 kV
S/C , D/C & 220kV S/C lines shall be employed. Inter-circuit coupling shall be
used for 220/132kV D/C lines and phase to ground coupling shall be used for
132 KV S/C lines. Double differential coupling shall also be considered for
double circuit lines. Bidders must furnish detailed write-up on methods of
coupling and recommend suitable coupling mode for double-circuit lines along-
with the bids. Coupling mode shall, however, be fully confirmed by Contractor
after conducting detailed computer study taking into account the transpositions of
765kV/400 kV lines for optimum coupling mode over these line sections. The
coupling arrangement shall be fully optimized by the Contractor after conducting
detailed study of every line section individually, taking into account the
temperature variations, transpositions, earth resistivity, conductor configuration,
carrier channels requirements, security and reliability criteria and other relevant
details. The line attenuation shall be calculated for complete range of frequencies.
The earth resistivity data, existing frequency networks and other relevant details
of each line will be furnished to the Contractor for carrying out the computer
studies and frequency planning. The Contractor shall complete the computer
Tech Specification, Section : PLCC Page 3 of 23
C/ENGG/SPEC/ PLCC REV NO:05
 studies wherever required and submit the frequency plan and optimum coupling
details within a period of one month from the date of receipt of above data.

5.8 The 765kV/400 kV transmission lines may be transposed.

The transmission tower configuration and conductor details shall be forwarded

after the award to enable the contractor to make his own computer study
assessment of the carrier path based on wave propagation over transposed lines
with each transposition point acting as “Modal Converter”.

5.9 The parameters of the equipment quoted shall be such that the mode of wave
propagation on 765kV/400 kV power line (with transpositions indicated) shall not
impose any limitation on the efficient and reliable performance of information
link from protection or communication point of view.

5.10 The Contractor shall have to check and prove through the results of his computer
studies that attenuation due to transpositions in the EHV lines is within limits
and the offered equipment will perform satisfactorily.

5.11 The Bidder shall submit curves illustrating ‘incorrect tripping’ and “Failure to
trip” probability plotted against corona noise level, in the presence of impulse
noise due to switching of isolator and circuit breaker etc. Details of field tests and
laboratory tests for successful operation of his equipment, under such adverse
conditions shall be furnished by the Bidder. These are to be related to end-to-end
signaling and shall take into account the type of communication link e.g. account
shall be taken of transpositions in the phase to phase coupled H.T. line. Details of
field tests and laboratory tests for successful operation of the equipment under the
above circumstances shall be submitted by the Bidder illustrating the above
parameters.

6. LINE TRAP

6.1 Line trap shall be broad band tuned for its entire carrier frequency range.
Resistive component of impedance of the line trap within its carrier frequency
blocking range shall not be less than 450 ohms for 765kV/400 kV system and 570
ohms for 220kV and 132 kV systems..

6.2 Line trap shall be provided with a protective device in the form of surge arrestors
which shall be designed and arranged such that neither significant alteration in its
protective function nor physical damage shall result from either temperature rise
or the magnetic field of the main coil at continuous rated current or rated short
time current. The protective device shall neither enter into operation nor remain in
operation, following transient actuation by the power frequency voltage
developed across the line trap by the rated short time current.

Tech Specification, Section : PLCC Page 4 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 The lightning arrestor shall be station class current limiting active gap type. Its
rated discharge current shall be 10 kA. Coordination, however, shall be done by
taking 20 kA at 8/20 micro-sec. discharge current into account. Bidder has to
furnish full justification in case the use of gap-less metal oxide arrestor is
recommended by them.

6.3 The lightning arrestor provided with the line trap of each rating shall fully comply
with the requirements of IS:3070 Part-I/IEC-60099-I Part-I. It shall conform to
type tests as applicable and type test certificate for the same shall be submitted by
the Bidder.

6.4 The lightning arrestor provided with the line trap shall be subject to routine and
acceptance tests as per IEC-60099-1 (Part-I).

6.5 The line trap on 765kV & 400 kV lines shall show no visual corona discharge at a
voltage of 508kV(rms) and 320 KV (rms) power frequency falling voltage.
Suitable corona rings may be incorporated in the line trap. Radio interference
voltage for 420/245/132 kV shall not exceed 500 micro volts at 280/163/97 kV
(rms) respectively. For 765kV, RIV shall not exceed 1000 micro volts at
508kV(rms).

6.6 Line trap shall be equipped with the bird barriers.

6.7 Line trap shall conform to IEC 60353 (latest) fulfilling all the technical
requirements. The rated short time current for 1 Second shall be 31.5/40/50/63 kA
as per requirement. The mH. rating shall be 0.25/0.5/1.0 mH depending on
frequency plan.

6.8 The Bidder shall indicate continuous current rating of the line trap at 65 deg. C
ambient.

6.9 Reports for the following type tests on each type of line trap shall be submitted
as per clause 9.2 of GTR .

1. Measurement of Inductance of the main coil.

2. Measurement of temperature rise.
3. Insulation test.
4. Short time current test.
5. Corona Extinction Voltage test (procedure for this shall be mutually
agreed ).
6. Radio Interference Voltage measurement test (procedure for this shall be
mutually agreed ).

Tech Specification, Section : PLCC Page 5 of 23

C/ENGG/SPEC/ PLCC REV NO:05
6.10 The Bidder must enclose with his bid the reports of type and routine tests
conducted on similar equipment earlier as per IEC-60353.

6.11 Welding

All the welding included in the manufacture of line traps shall be performed by
personnel and procedure qualified in accordance with ASME-IX and all the
critical welds shall be subject to NDT as applicable.

6.12 Line Trap Mounting

6.12.1 The Line Trap shall be suitable for outdoor pedestal or suspension mounting and
shall be mechanically strong enough to withstand the stresses due to maximum
wind pressure of 260 kg/square meter.

6.12.2 For pedestal mounting, each line trap shall be mounted on a tripod structure
formed by three insulator stacks arranged in a triangular form. All the accessories
and hardware, mounting stool including bolts for fixing the line trap on insulators
shall be of non-magnetic material and shall be supplied by the Contractor.

6.12.3 For suspension mounting, Contractor shall be required to coordinate the mounting
arrangement with the existing arrangement. Non-magnetic suspension hook/link
of adequate length and tensile strength to provide necessary magnetic clearance
between the line trap and suspension hardware shall be supplied by the
Contractor.

6.13 Terminal Connectors

6.13.1 The line traps shall be suitable for connecting to 4" IPS Aluminium tube or 3"
IPS Al. tube or ACSR single/twin/Quad bundle conductor with horizontal or
vertical take off. Necessary connector shall be supplied by the Contractor.

6.13.2 Terminal Connectors shall conform to IS:5561.

6.13.3 No part of clamp or connector (including hardware) shall be of magnetic material.

6.13.4 Clamps and connectors shall be designed corona controlled. Visual Corona
extinction voltage shall not be less than 508kV(rms) & 320kV(rms) for 765kV
and 420kV respectively. All nuts and bolts shall be suitably shrouded.

6.13.5 Radio interference Voltage for 420/245/132 kV shall not exceed 500 microvolts
at 280/163/97 kV (rms) respectively. For 765kV, RIV shall not exceed 1000
micro volts at 508kV(rms).

Tech Specification, Section : PLCC Page 6 of 23

C/ENGG/SPEC/ PLCC REV NO:05
6.13.6 Clamps/connectors shall be designed for the same current ratings as line trap and
temperature rise shall not exceed 35 deg. C over 50 deg. C ambient. No current
carrying part shall be less than 10 mm thick.

6.13.7 Clamps/connectors shall conform to type test as per IS:5561. Type Test reports
shall also be submitted for following additional type tests :

a) Visual Corona Extinction Test

b) Radio Interference Voltage Measurement

6.13.8 Bidders are required to submit alongwith their bid typical drawings clearly
indicating the above mentioned features of the line traps, line trap mounting
arrangement and terminal connectors. For suspension mounted line traps, Bidder
shall submit drawings showing single point as well as multipoint (normally 3
point) suspension arrangements.

7. COUPLING DEVICE

7.1 The coupling devices shall be interposed between the capacitor voltage
transformer and coaxial line to the PLC transmitter/receiver, and in conjunction
with the capacitor voltage transformer shall ensure :

a) Efficient transmission of carrier frequency signals between the carrier

frequency connection and the power line.

b) Safety of personnel and protection of the low voltage parts and

installation, against the effects of power frequency voltage and transient
over voltages.

7.2 The coupling device, in conjunction with the CVT shall from an electric filter of
band pass type :

a) It shall match characteristic impedance of H.T. line to impedance of the

carrier frequency connection.

b) Galvanic isolation between primary and secondary terminals of the

coupling device shall be performed by the above mentioned transformer.

c) Power frequency currents derived by the CVT may be drained to the earth
by a separate inductance termed drain coil of suitable rating.

d) Voltage surges coming from the power line at the terminals of the
coupling device shall be limited by a non-linear surge arrestor of suitable
rating in the primary side. Requirement of a gas type voltage arrestor in
secondary side of the coupling device shall have to be fully justified, but

Tech Specification, Section : PLCC Page 7 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 in any case the input circuit of PLC. equipment shall have protective
devices in the form of zener diodes and surge suppressers.
The surge arrester shall have power frequency spark over voltage
coordinated with the equipment ahead of it.
e) For direct and efficient earthing of its primary terminals, the coupling
device shall be equipped with an earthing switch. The Earth Switch shall
be available for earthing of CVT-HT terminals, when the coupling filter
units are removed from circuit for maintenance/ replacement. The design
shall take due regard of requirements for safety in accordance with the
Indian Electricity Rules.

7.3 Two numbers ‘phase to earth’ type coupling filters shall be used to achieve
‘phase to phase’/ ‘inter-circuit coupling’. Connection between secondaries of the
two phase to earth type coupling device shall be through a balancing
transformer/hybrid such that reliable communication shall be ensured even when
one of the coupled phase is earthed or open circuited on the line side.

7.4 Coupling device shall conform to IEC-60481 and shall have the following carrier
frequency characteristics as applicable to a phase to earth type coupling device:

a) Nominal line side i) 240 ohms for 765kV and 400 kV Quad/triple
impedance bundle conductor line.
ii) 320 ohms for 400kV twin bundle conductor line.
iii) 400 ohms for 220/132 kV line
b) Nominal equipment 75 ohms (unbalanced)
side impedance
c) Composite loss Not more than 2 dB

d) Return Loss Not less than 12 dB

e) Bandwidth Shall suit the frequency plan between 36 and

500 kHz

f) Nominal peak Not less than 650 Watt.

envelope power
(for Inter-modulation product 80 dB down)

7.5 The coupling device shall be suitable for outdoor mounting. Temperature of
metallic equipment mounted outdoor is expected to rise upto 65 deg. C during the
maximum ambient temperature of 50 deg. C specified. The equipment offered by
the Bidder shall operate satisfactorily under these conditions.

Tech Specification, Section : PLCC Page 8 of 23

C/ENGG/SPEC/ PLCC REV NO:05
7.6 The H.T. Terminal of coupling device shall be connected to H.F. Terminal of the
CVT by means of 6 mm sq. copper wire with suitable lugs & taped with 11 kV
insulation by the contractor.

7.7 Coupling device shall have at least two terminals for carrier equipment
connection. Bidder shall confirm that such a parallel connection to coupling
device directly will not result in any additional attenuation.

7.8 The coupling device including the drainage coil, surge arrester and earthing
switch shall conform to type tests and shall be subject to routine tests as per IEC-
60481/IS:8998.

Routine tests shall include but not be limited to the following :

i) Composite loss and return loss tests on coupling device.

ii) Turns ratio test and insulation tests on the balancing transformer.

iii) Milli volt drop test, power frequency voltage test and mechanical
operation test on earthing switch.

iv) Power frequency spark over test for lightning arrester as per relevant
IS/IEC.

7.9 Reports for the following type tests on coupling device shall be submitted as per
clause 9.2 of GTR .

1.)Return loss test.

2.)Composite loss test.

3. )Distortion and inter modulation test .

4.)Impulse voltage test.

5)Tests on Arrestors

Bidder shall furnish, alongwith his bid copies of all type and routine test
conducted earlier on similar coupling device in accordance with relevant
standards.

8. High Frequency Cable

8.1 High frequency cable shall connect the coupling device installed in the switchyard
to the PLC terminal installed indoor.

Tech Specification, Section : PLCC Page 9 of 23

C/ENGG/SPEC/ PLCC REV NO:05
8.2 The cable shall be steel armoured and its outer covering shall be protected against
attack by termites. Bidder shall offer his comments on method employed by him
for earthing of screen and submit full justification for the same with due regard to
safety requirements.

Bidder must enclose in his bid a detailed construction drawing of the cable being
offered, with mechanical and electrical parameters.

8.3 Impedance of the cable shall be such as to match the impedance of the PLC
terminal on one side and to that of the coupling device on the other side over the
entire carrier frequency range of 40-500 kHz.

8.4 Conductor resistance of cable shall not exceed 16 ohms per Km at 20°C.

8.5 The cable shall be designed to withstand test voltage of 4 kV between conductor
and outer sheath for one minute.

8.6 Bidder shall specify attenuation per Km of the cable at various carrier frequencies
in the range of 40 to 500 kHz. The typical attenuation figures for H.F. cable shall
be in the range of 1 to 5 dB/km in the frequency range of 40-500 kHz.

8.7 The H.F. cable shall conform to type tests and be subjected to routine tests as per
IS 11967(Part 2/Sec 1): 1989/IS 5026:1987.

8.8 All HF cables within the scope of this specification shall be laid and termination
shall be carried out by the Contractor.

8.9 The cables shall be supplied wound on drums containing nominal length of 500
meters each. However, exact requirement of drum lengths shall be finalised
during detailed engineering to avoid joint in HF cable and its wastage.

9. Power Line Carrier Terminal

9.1 As already indicated the information link shall be provided for speech, protection,
telex and data services.

9.2 PLC terminal shall use Amplitude Modulation and shall have single side band
transmission mode. These shall be equipped for fixed frequency duplex working.

Characteristic input and output parameters of the SSB PLC terminals shall be as
per IEC-60495, unless otherwise specified.

9.3 The salient features are detailed out below :

Tech Specification, Section : PLCC Page 10 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 a) Mode of transmission Amplitude Modulation single side band with
suppressed carrier or reduced carrier.

b) Carrier frequency 40 to 500 kHz range

c) Nominal carrier frequency 4.0 kHz

band in either direction of
transmission

d) Power output (PEP) 20/40/80 Watt

at HF terminal

e) Frequency difference Frequency difference between VF

between a pair of signal at the transmitting and rece-
PLC terminals iving ends will not exceed 2 Hz with
suppressed carrier. With reduced carrier
frequency difference shall be zero. This
shall include permissible ambient
temperature variation and supply frequency
and voltage variation of (+) 15% and (-)
10%.

f) Automatic gain For 40 dB change in carrier frequ-

control ency signal level within the regulation
range, change in VF receive levels of both
speech and other signals shall be less than
1dB.

g) Supply voltage 48 V DC + 15%, - 10%. (Positive pole

earthed)

9.4 All the PLC terminals shall be of multipurpose type. The Bidder shall confirm
that the total transmission time for teleprotection shall not exceed 20 ms for
permissive and 30 ms for direct tripping signals. Speech and teleprotection
channels shall independently fulfill the SNR requirements out of the power
allocated to its channel from the total power of the PLC terminals.

Detailed calculation for SNR requirement and power allocation over different
channels should be furnished alongwith the bid.

9.5 In the input circuit of the PLC terminal protective devices shall be provided in the
form of zener diodes or surge suppressers in order to eliminate any surge transfer
through the coupling device or the surge induced in the connecting path of H.F.
cable.

Tech Specification, Section : PLCC Page 11 of 23

C/ENGG/SPEC/ PLCC REV NO:05
9.6 To improve voice transmission characteristics for the system, compressors and
expanders shall be provided. The companders shall have at least 2:1 compression
ratio with a corresponding expansion ratio of 1:2. The operating range of
compander shall be compatible with the audio power levels specified for 4 wire
operation. The improvement gained by companders shall however not be taken
into account for power allocation and shall be in-hand reserve.

9.7 Sudden changes in input level to the receiver shall not cause false tripping. The
Bidder shall clearly indicate in his offer the methods adopted to ensure above
phenomenon. The receiver design shall also provide protection against false
tripping from random noise.

9.8 Fail-safe devices shall be provided, so that a malfunction in one unit or

subassembly cannot cause damage elsewhere in the system. All plug-in
equipment shall be fitted with features to prevent improper insertion. The
electrical cables shall not be routed across sharp edges or near sources of high
temperature. The adjustments, which are susceptible to misadjustment from
accidental contact/vibration, shall be equipped with suitable locking devices.

9.9 The PLC set shall be designed to give guaranteed performance from 0 deg. C to
50 deg. C ambient temperature. The thermal capability of the equipment shall be
so designed that the equipment remains operational successfully upto 60 deg. C
ambient temperature. Any ventilation fans provided for circulation of air inside
the cabinets shall conform to relevant Indian Standards.

9.10 The terminals shall be provided with built-in indicating instrument to facilitate
checking of important voltages and current values and signal levels in different
parts of the PLC Terminals. Protection fuses shall be provided in all important
circuits and fuses shall be so mounted as allow their easy inspection and
replacement. All test points shall be easily accessible.

The carrier set shall be provided with suitable supervision and alarm facilities.
Individual parts of the carrier set should be accessible from front, making it
possible to place the carrier cabinets side-by-side. All components and parts of the
carrier set shall be suitably tropicalised.

9.11 PLC terminals shall be housed in floor mounting sheet metal cabinets, suitable for
mounting on concrete plinth as well as channel frame by means of nuts and bolts
or welding. All the panels shall be properly earthed to the OWNER’s earthing
grid by the Contractor. Contractor shall submit detailed drawings for earthing
connections.

9.12 All the panels shall be protected against moisture ingress and corrosion during
storage. Panels shall be properly dried before they are installed and energized.

Tech Specification, Section : PLCC Page 12 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 Bidder shall indicate measures adopted to prevent ingress of moisture during
operation.

9.13 All cabinets having PLC terminals shall be provided with lamps of sufficient
wattage for interior illumination with switch. Each panel shall be provided with
240 V AC single phase socket with switch to accept 5 & 15A standard Indian
plugs.

9.14 A name plate shall be provided on the front door of each cabinet indicating
channel function, transmitter frequency and direction etc.

9.15 Reports for the following type tests for PLC Terminals shall be submitted as per
clause 9.2 of GTR .
Tests to determine various characteristics of PLC terminals as per IEC –60495.

a)Voltage variation

b)Carrier frequency range band.

c)Frequency accuracy

d)Transmit/Receive frequency difference.

e)Automatic gain control

f)Harmonic distortion

g) Selectivity

h)Output impedence, Return loss&Tapping loss

i)Return loss, Afinputs/Outputs

j)Balance to ground

k)Limiter action

l)Spurious emission

m)Carrier frequency levels and levels

n)Attenuation distortion

o)Noise generated within terminal

Tech Specification, Section : PLCC Page 13 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 p)Near and far end cross talk

q)Group delay distortion

r)Conducted noise

s)Telephone signaling channel

t)Speech levels

u)Voltage withstand test

v)Insulation test

9.16 Heat Soaking of panels

All the solid state equipment/system panels shall be subjected to the Heat Soaking
as per the following procedure :

All solid state equipment shall be burn-in for minimum of 120 hours
continuously under operation condition. During the last 48 hours of testing, the
ambient temperature of the test chamber shall be 50°C. Each PLC panel shall be
complete with all associated sub-systems and the same shall be in operation
during the above test. During the last 48 hours of the above test, the temperature
inside the panel shall be monitored with all the doors closed. The temperature of
the panel interior shall not exceed 65°C.

10. SPEECH COMMUNICATION

10.1 PLC equipment offered shall provide telephone communication between the
stations where the transmission lines are terminating. The equipment shall be
suitable for providing the following facilities :

a) It shall be possible for subscriber at any of the stations to contact the

subscriber at all other stations connected in the system as shown in the
specification drawing by dialing his call number. To achieve this a 24
lines EPAX with 4 wire interface & remote subscriber units shall be
provided/available at different stations.

b) The equipment shall contain all normal facilities like ring back tone, dial
tone, engage tone & priority tone, and suitable pulses to establish and
disconnect communication between subscribers.

c) The equipment shall be provided with necessary alarm circuits and fuses
etc.

Tech Specification, Section : PLCC Page 14 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 d) The equipment shall be of 4 kHz bandwidth on either direction and be
suitable for providing superimposed data and teleprinter facilities at a later
date without major modifications and high cost. The Bidder shall clearly
indicate in his bid the provision made in his proposal for future
development and the extent to which such additional facilities can be
added at a later date.

e) The system shall be completely automatic with definite number allocated

for each telephone. The numbering scheme for telephones, exchange and
tie lines shall be developed by the Bidder and indicated in the bid. Final
numbering scheme shall be fully coordinated with the existing/ proposed
future systems by the Contractor.
f) Arrangement for over-riding facilities shall be provided by means of
priority keys wherever specified. The over-riding facility shall enable
cutting-in ongoing calls with the priority key and ask the concerned parties
to finish their conversation. The wanted number should then get
automatically connected without having to redial the number.

g) All the carrier telephone conversations shall be secret and it should not be
possible for anybody to over hear the conversation going on between any
two parties excepting those provided with over-riding facilities.

h) The necessary cables for connecting all the telephone instruments ordered
for at each sub-station (including wiring and termination) shall be
provided by the Contractor. These telephone instruments shall be located
within control room building at respective sub-station.

i) The cabinets housing the equipment for EPAX, four wire E/M interface &
remote subscriber units (four wire) shall have mounting arrangement
similar to that for PLC terminals.

j) All the terminals for speech shall be with Transit Band Pass Filter suitable
for tuning at site and shall be wired for addition of VFTs in future.

k) Equipment for speech communication must be fully compatible with

OWNER’s existing equipment. Any interfaces required for proper
matching and connection with the OWNER’s existing equipment shall be
provided by the Contractor.

l) Terminals for protection shall be suitable for speech between two ends of
each transmission line or on tandem operation basis with back to back
connection at the intermediate stations.

n) Each PLC terminal for speech as well as protection purposes shall be

provided with a plug-in type service telephone and buzzer. Further, 4 wire

Tech Specification, Section : PLCC Page 15 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 remote telephone instruments (parallel to service telephone) shall also be
provided on one PLC terminal for protection for each link. These
instruments shall be located in respective Switchyard control room to
enable the operator to make emergency calls on point-to-point basis. Each
such instrument shall be equipped with a buzzer and ‘press-to-call’ key
and shall not require any additional power supply units.

10.2 Electronic Private Automatic Exchange (EPAX)

10.2.1 The 24 line Electronic Private Automatic Exchange (EPAX) wherever specified
shall be connected to minimum six trunk routes thorough PLCC channels (speech
panel) with Four-wire E/M’ interface unit. This 4-wire interface unit either shall
form an integral part of the ‘EPAX’ system or be suitable for mounting/housing in
the carrier panel. The exchange will have its own ringing current and tone
generator etc. The exchange shall be suitable for working on 48 V DC Power
Supply (positive pole earthed).
The exchange shall be fully automatic, solid state, and of modular construction
and shall have multiple switching routes (minimum 4-routes).

10.2.2 ‘EPAX’ shall also be provided with two (2) additional interface units and operate
exclusively with OWNER’s leased subscriber lines, of Department of
Telecommunication (DOT) and compatible with 2 wire full duplex, voice grade
mode of operation.

The details of communication protocol, for interfacing of the ‘DOT’ leased lines,
shall be coordinated by the Contractor, with the licensing authority (DOT).

10.3 Remote End Four Wire ‘E/M’ Interface & Subscriber Unit or Equivalent
EPAX (4x4)

10.3.1 The remote end four wire ‘E/M’ interface & subscriber units, wherever specified,
shall be of electronic type and be suitable for working on fixed frequency power
line carrier systems with E & M signaling. This shall be housed in the carrier set
and be fully wired to the power line carrier terminal equipment.

10.3.2 This unit shall receive and register various signals, on PLCC Channels, from
remote end exchanges or other remote end subscriber units and associated four
wire interface unit.

10.3.3 The four wire interface unit shall be equipped for routing transit calls and shall be
supplied pre-wired to handle calls for minimum eight directions, in a form
suitable for transmission over PLCC.

10.3.4 The bidder shall also indicate the total number of trunk-line capacity, available
with each four-wire interface unit.

Tech Specification, Section : PLCC Page 16 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 The unit shall be suitable for connecting two-wire telephone sets. Further, the
associated telephone cables for locating two subscriber lines, within the control
room is in the scope of this specification.

10.4 Network Protection Equipment (Protection Coupler)

10.4.1 The Bidder shall offer voice frequency transmission equipment which shall work
on frequency shift or coded signal principle for transmission/reception of
protection signals as single purpose channel. The equipment shall be suitable for
connection to the power line carrier terminal.

10.4.2 The voice frequency transmission equipment shall not only be insensitive to
corona noise but shall also remain unaffected by impulse type noise which are
generated by electrical discharge and by the opening and closing of circuit
breakers, isolators, earthing switches etc. The equipment shall also be made
immune to a field strength of 10V/m expected to be caused by portable radio
transmitters in the range of 20-1000 MHz. In his offer, bidder shall clearly explain
as to what measures have been taken to make the equipment insensitive to corona
noise, white noise and to impulse noise of an amplitude larger than the wanted
signal and submit full field test and laboratory test reports. The guarantee on
design data shall not be acceptable.

10.4.3 The equipment shall be unaffected by spurious tripping signals. The Bidder shall
submit proof as to how this is achieved satisfactorily.

10.4.4 The equipment shall be suitable for transmission of direct and permissive trip
signal as well as blocking signals for protective gear of power system. The
equipment shall be operated in the audio frequency range in speech band or
above speech band as superimposed channel in 4 kHz band of SSB carrier. The
equipment shall operate with full duplex frequency shift mode of operation or by
switching between two frequencies in case of coded signals . The protection
signaling equipment shall be of solid state design, modular in construction and
have a proven operating record in similar application over EHV systems. Details
regarding application of the equipment over 765kV/400kV/220kV systems shall
be submitted along with the bid. Each protection signaling equipment shall
provide:

i) Transmission facilities for minimum three protection signals.

ii) Reception facilities for minimum three protection signals.

10.4.5 The equipment shall be designed for remote tripping/ blocking on permissive
basis and direct tripping for reactor fault and others. The overall time of PLC,

Tech Specification, Section : PLCC Page 17 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 VFT and transmission path for permissive trip/blocking shall be 20 m. Sec. or less
and for direct tripping 30 m. Sec. or less even for the longest line section.

Operating time lower than specified above may be preferred provided they fulfill
the requirements of security and reliability as mentioned below :
False - trip probability 10-5
(Noise burst of any amplitude)

Fail to trip probability 10-2

for S/N 6 dB in 3.1 kHz Band
(white Noise Measurement)

10.4.6 It may be emphasized that specified time, as mentioned above is composed of the
following :

a) Back-to-back signal delay in frequency shift or coded signals protection

equipment.

b) Back-to-back delay in PLC terminal.

c) Delay in transmission line.

d) Operation time of interposing relay, if any, in frequency shift or coding

equipment.

Reference is invited in this regard to the guide lines expressed in CIGRE

Publication “Teleprotection” report by Committee 34 and 35.

10.4.7 The following transfer criteria shall be provided by the equipment:

a) Transmit side

One number potential free NO (normally open) contact of protective

relays (To be supplied by the OWNER) of under noted rating for each of
the following functions:

i) Permissive trip command

ii) Direct trip command

Contact Rating:

Maximum voltage : 660 Volts

Maximum current rating : 5 amps
Maximum power rating : 1250 W/VA
Tech Specification, Section : PLCC Page 18 of 23
C/ENGG/SPEC/ PLCC REV NO:05
 b) Receive Side

Voice frequency transmission equipment for network protection shall be

provided with one potential free NO (normally open) contact of the under
noted rating for each of the following functions:

i) Permissive trip command

ii) Direct trip command

Contact Rating:

Rated voltage : 250 Volts DC

Rated current : 0.1 A DC
Other Parameters : As per IEC-60255-25

c) Alarm

In addition, the voice frequency protection terminal shall provide at least

one number potential free change over contact of the following rating for
alarm purposes.

Rated voltage : 250 volts DC

Rated current : 0.1 A DC
Other Parameters : As per IEC-60255-25

10.4.8 The Contractor shall submit drawings showing inter-connection between PLCC
and protection panels for approval by the OWNER.

10.4.9 It has to be ensured that under no circumstances protection channel should share
the power. Each protection channel shall be able to transmit power for which
system is designed. For example, a 40 W PLC terminal shall transmit 40 Watt
(max.) for protection channel alone in the event of fault. Speech and super-
imposed data channels, in the same protection terminal must get disconnected
momentarily during the operation of protection channels.

10.4.10 The equipment shall be constructed such that in permissive line protection system,
operational reliability of the protection channel may be checked over the carrier
link by means of a loop test. It shall be possible to carry out the above test from
either end of the carrier link. During healthy condition of the transmission line,
the loop test shall not initiate a tripping command. In the event of a system fault,
while loop test is in progress, protection signal shall over-ride the test signal.

Tech Specification, Section : PLCC Page 19 of 23

C/ENGG/SPEC/ PLCC REV NO:05
10.4.11 The equipment shall be complete with built in counters for counting the number
of trip commands sent and number of trip commands received.

10.4.12 Reports for the following tests as per clause 9.2 of GTR shall be submitted for
approval for protection coupler and the relays associated with PLCC equipment
for network protection signaling equipment and interface unit with protective
relay units if any :

1)Protection coupler ( As per IEC 60834 -1)

a)Power supply variation

b)Power supply interruption

c)Reflected noise

d)Reverse polarity

e)Interference by discrete frequency

f)Transmission time

g) Interference by frequency deviation. ( Wherever applicable)

h)Alarm function

g)Security

h)Dependability

i)Voltage withstand test

j)Insulation test.

j) Electrical fast transient test (along with carrier terminal)

k)HF disturbance test (along with carrier terminal)

l )Electro static discharge test (along with carrier terminal)

m)Radiated electromagnetic field susceptibility test (along with carrier terminal)

n)Environment test (as per IS 9000 )

:

Tech Specification, Section : PLCC Page 20 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 2. Relays.

a) Impulse voltage withstand test as per Clause 5.1 of IS:8686 (for a

test voltage appropriate to Class III as per Clause 3.2 of IS:8686).

b) High Frequency Disturbance test as per Clause 5.2 of IS:8686 (for

a test voltage appropriate to Class III as per Clause 3.2 of IS:8686).

11. Mandatory Testing & Maintenance Equipment

Print testing kit for PLCC terminal, E/M interface & subscriber unit, Protection
coupler & EPAX —

comprising of following items of reputed make in addition to any other special

items required for testing and maintenance of this equipment packed in a carrying
brief case:

1. Screw driver set with multi up fixing feature

2. Nose pliers

3. Cutting pliers

4. Ordinary Pliers

5. Adjustable wrench

6. Soldering iron with tip earthed

a) 150 watts - 1 No.

b) 35 Watts - 1 No

c) 10 watts - 1 No.

operated with isolated (step down) transformer having provision for

interchangeable taps.
7. Desoldering pump

8. Print extender

9. Print puller

10. Large selection of test leads

Tech Specification, Section : PLCC Page 21 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 11. Solder wire

12. Large selection of plugs, jacks & pistol probes compatible with equipment
supplied

13. Dummy load

14. Interface card/print for Tx to Rx loop-back

15. Test oscillator/tone generator with indicating meters - either built in or

separate

16. ESD wrist band

17. ESD conducting mat

12. LIST OF COMMISSIONING TESTS

The following tests shall be carried out on complete system/subsystem during

commissioning:

1. Composite loss and return loss on coupling device using dummy load.

2. Composite loss (Attenuation) for HF Cable coupling device.

3. End to end attenuation measurement for verification of optimum coupling

mode. Test shall be done for all combinations.

4. End to end return loss for optimum coupling mode.

a. open behind line trap.

b. grounded behind line trap.

5. If end to end return loss for optimum coupling mode is not satisfactory,
same shall be measured for other coupling modes also.

6. Adjustment of Tx/Rx levels on PLCC equipment as per test schedule.

7. AF frequency response (end to end) for the entire 4 kHz Bandwidth for
speech and teleoperation channels.

8. Measurement of noise in 2 kHZ bandwidth with and without line

energised.

Tech Specification, Section : PLCC Page 22 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 9. SNR (test-one) with line energised noting down weather conditions.

10. Transmission time for teleprotection and other data channels.

11. Observation of Tx/Rx levels (test-tone) for each channel at both ends by
sequential switching on/off parallel channels using dummy load and also
with the transmission line.

12. Observation of end to end and trunk dialing performance.

13. Observation of end-to-end protection signaling (command sent &

received) in conjunction with protective relays, noting down
transmission/receipt of unwanted commands under switching operations in
the switchyard during protective relay testing.

Notes

1. All measurements for link attenuation, composite loss and return loss shall
be carried out for the entire range of carrier frequencies with specific
attention to the frequencies.

i. within coupling device bandwidth.

ii. within line trap bandwidth, and

iii. operating frequencies.

2 Following tests shall be carried out independently at each and

i. Composite loss & return loss for coupling device.

ii. Attenuation test for HF cable + coupling device.

iii. Levels and other local adjustments (on dummy load).

Final adjustment shall be on end to end basis.

iv. Test for loading by parallel channels with dummy load.

This test can be done alongwith tests for coupling device.

v. Protection signaling under local loop test (dummy load).

3. Necessary test instruments required for all the above tests shall be brought
by commissioning engineers of the contractor.

Tech Specification, Section : PLCC Page 23 of 23

C/ENGG/SPEC/ PLCC REV NO:05
 MODEL TECHNICAL SPECIFICATION

SECTION: LT SWITCHGEAR

Technical Specification, Section: LT Switchgear .

C/ENGG/SPEC/LTSWGR Rev. No: 5
 SECTION: LTSWITCHGEAR
Table of contents

Clause No. Description Page No.

1.1 CONSTRUCTIONAL DETAILS OF SWITCHBOARDS 1

AND DISTRIBUTION BOARDS
1.2 DERATING OF EQUIPMENTS 4
1.3 POWER BUS BARS AND INSULATORS 4
1.4 EARTH BUS 4
1.5 AIR CIRCUIT BREAKERS 4
1.6 MOULDED CASE CIRCUIT BREAKER (MCCB) and 7
MCB
1.7 RELAYS 7
1.8 CONTACTORS 8
1.9 INSTRUMENT TRANSFORMERS 8
1.10 INDICATING INSTRUMENTS 9
1.11 CONTROL & SELECTOR SWITCHES 9
1.12 AIR BREAK SWITCHES 10
1.13 PUSH BUTTONS 10
1.14 INDICATING LAMPS 10
1.15 FUSES 11
1.16 TERMINAL BLOCKS 11
1.17 NAME PLATES AND LABELS 12
1.18 SPACE HEATER 12
1.19 CONTROL AND SECONDARY WIRING 12
1.20 POWER CABLES TERMINATION 13
1.21 TYPE TESTS 13
1.22 ERECTION, TESTING AND COMMISSIONING 13
1.23 COMMISSIONING CHECK TESTS 14
1.24 SPECIAL TOOLS AND TACKLES 16
1.25 EQUIPMENT TO BE FURNISHED 16
1.26 PARAMETERS 21
1.27 AUTOMATIC CONTROL OF OUTDOOR LIGHTING 25
1.28 AUTOMATIC SUPPLY CHANGEOVER 25
1.29 ANALOGUE INPUTS 26
1.30 DIGITAL (POTENTIAL FREE INPUTS) 26

Technical Specification, Section: LT Switchgear .

C/ENGG/SPEC/LTSWGR Rev. No: 5
 SECTION: LT SWITCHGEAR

1.1. CONSTRUCTIONAL DETAILS OF SWITCHBOARDS AND

DISTRIBUTION BOARDS
1.1.1. All boards shall be of metal enclosed, indoor floor mounted, compartmentalised double
front construction and freestanding type.

1.1.2. All board frames, shall be fabricated using suitable mild steel structural sections or
pressed and shaped cold-rolled sheet steel of thickness not less than 2.0 mm. Frames
shall be enclosed in cold-rolled sheet steel of thickness not less than 1.6 mm. Doors and
covers shall also be of cold rolled sheet steel of thickness not less than 1.6 mm.
Stiffeners shall be provided wherever necessary. Gland plate shall be cold rolled sheet
steel having thickness not less than 3 mm in all cases. However, in case of termination
of single core power cables, gland plate shall be of non-magnetic material of at least
4mm thickness.
1.1.3. All panel edges and cover/door edges shall be reinforced against distortion by rolling,
bending or by the addition of welded reinforcement members.

1.1.4. The complete structures shall be rigid, self-supporting, and free from flaws, twists and
bends. All cut-outs shall be true in shape and devoid of sharp edges.

1.1.5. All boards shall be of dust and vermin proof construction and shall be provided with a
degree of protection of IP: 52, for category I enclosure as per IS 13947 (Part-1).
However, the busbar chambers having a degree of protection of IP: 42, in accordance
with IS 13947 (Part-1), are also acceptable where continuous busbar rating exceeds 1000
Amp. Provision shall be made in all draw out Air Circuit Breaker compartments for
providing IP: 52 degree of protection, when Circuit breaker trolley, has been removed.
Panels with lighting transformers shall have IP 31 degree of protection in accordance
with IS 13947 (Part-1). Door frame of panels, meters, relays, Breaker cut-outs shall be
provided with neoprene rubber gaskets generally conforming to Type-II, Class 2A as
per IS: 11149.

1.1.6. Provision of louvers on boards would not be preferred. However, louvers backed with
metal screen are acceptable on the busbar chambers where continuous busbar rating
exceeds 1000 Amps. Panels with lighting transformers in lighting distribution boards
shall have louvers.

1.1.7. All boards shall be of uniform height not exceeding 2450 mm.

1.1.8. Boards shall be easily extendible on both sides, by the addition of the vertical sections
after removing the end covers of bus bar chambers.

Technical Specification, Section: LT Switchgear . Page:1 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.1.9. Boards shall be supplied with base frames made of structural steel sections, alongwith all
necessary mounting hardware required for welding the base frames to the insert plates.

1.1.10. a) All boards shall be of double front construction and shall have :
(i) A completely enclosed busbar compartment for running horizontal busbars and
vertical busbars. Busbar chambers shall be completely enclosed with metallic
portions. Bolted covers shall be provided for access to horizontal and Vertical
busbars for repair and maintenance, which shall be feasible without disturbing
feeder compartment. Vertical bus bar chambers shall be accessible from front as
well as back side of the panel and shall be of at least 350 mm width. One set of
vertical busbars shall be used in between two adjacent sections for switchgear
connections. In case of ACB feeders, the panel shall have single front without
any vertical busbar chamber, however vertical busbars associated with ACBs
shall be located in rear side and shall be additionally covered with metallic
perforated/ transparent acrylic or polyvinyl bolted sheets to avoid direct access
after opening rear door of chamber.

(ii) Completely enclosed switchgear compartment(s) one for each circuit for housing
circuit breaker or MCCB or motor starter.

(iii) A distinct compartment or alley for power and control cables on each side of
panel. Cable alley compartment shall have a through metallic partition for
segregating cables on both sides. Cable alley door shall preferably be hinged.
Cable alley shall have no exposed live parts. Any live terminals shall be fully
shrouded/insulated from safety aspects. However, it shall be of atleast 350mm
width.

(iv) A compartment for relays and other control devices associated with a circuit
breaker.

b) Lighting transformers shall be supplied in separate and distinct panel completely

assembled for incoming cable connection from bottom and outgoing connection
through busbar with adjacent associated lighting distribution board. Lighting
transformers shall have provision of base channel with rollers for taking in and out
from the panel in case of maintenance after disconnecting incoming and outgoing
connections. Provision of single phase fans at least two (2) numbers of suitable
ratings shall be made in the panel for ventilation. These fans shall run in
sequential mode at suitable time interval to be controlled by thermostat and timer.
The offered design of panel should be such that in no case, temperature rise of
lighting transformers shall exceed the permissible limits for the class of insulation
of lighting transformer.

1.1.11. Sheet steel barriers shall be provided between two adjacent vertical panels running to the
full height of the switchboard, except for the horizontal busbar compartment. Each
shipping section shall have full metal sheets at both ends for transport and storage.

1.1.12. All equipments associated with a single circuit except MCB circuits shall be housed in a
separate compartment of the vertical section. The Compartment shall be sheet steel
enclosed on all sides with the withdrawal units in position or removed. The front of the
compartment shall be provided with the hinged single leaf door, with locking facilities.
In case of circuits controlled by MCBs, group of MCB feeders can be offered in common
compartment. In such case number of MCB feeder to be used in a common compartment
shall not exceed 4 (four) and front of MCB compartment, shall have a viewing port of

Technical Specification, Section: LT Switchgear . Page:2 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
 toughen glass sheet for viewing and sheet steel door of module shall be lockable with
star knob/panel key.

1.1.13. After isolation of power and control circuit connections it shall be possible to safely
carryout maintenance in a compartment with the busbar and adjacent circuit live. Neces-
sary shrouding arrangement shall be provided for this purpose over the cable terminations
located in cable alley.

1.1.14. The minimum clearance in air between phases and between phase and earth for the entire
run of horizontal and vertical busbars, shall be 25 mm. For all other components, the
clearance between "two live parts", " A live part and an earthed part" and isolating
distance shall be atleast ten (10) mm throughout. Wherever it is not possible to maintain
these clearances, insulation shall be provided by sleeving or barriers. However, for
horizontal run of busbar minimum clearance of 25 mm should be maintained even if they
are sleeved.

1.1.15. The temperature rise of horizontal & vertical busbars when carrying rated current along
its full run shall in no case exceed 55°C, with silver plated joints and 40°C with all other
type of joints over an outside ambient temperature of 50°C.

1.1.16. All busbar chambers shall be provided with removable bolted covers . The covers shall
be provided with danger labels.

1.1.17. All identical circuit breakers and module chassis of same test size shall be fully
interchangeable without having to carryout modifications.

1.1.18. All Circuit breaker boards shall be of Single Front type, with fully drawout circuit
breakers, which can be drawn out without having to unscrew any connections. The circuit
breakers shall be mounted on rollers and guides for smooth movement between
SERVICE, TEST and ISOLATED positions and for withdrawal from the Switchboard.
Testing of the breaker shall be possible in the TEST position.

1.1.19. Wherever two breaker compartments are provided in the same vertical section, insulating
barriers and shrouds shall be provided in the rear cable compartment to avoid accidental
touch with the live parts of one circuit when working on the other circuit.

1.1.20. All disconnecting contacts for power circuits shall be of robust design and fully self
aligning. Fixed and moving contacts of the power drawout contact system shall be silver
plated. Both fixed and moving contacts shall be replaceable.

1.1.21. All AC & DC boards shall be of double Front type.

1.1.22. All module shall be fixed type except air circuit breaker module, which shall be drawout
type.

1.1.23. The connections from busbars to the main switch shall be fully insulated/shrouded, and
securely bolted. The partition between the feeder compartment and cable alley may be
non-metallic and shall be of such construction as to allow cable cores with lugs to be
easily inserted in the feeder compartment for termination.

1.1.24. All equipment and components shall be neatly arranged and shall be easily accessible for
operation and maintenance. The internal layout of all modules shall be subject to
PURCHASER approval. Bidder shall submit dimensional drawings showing complete
internal details of Busbars and module components, for each type and rating for approval.
Technical Specification, Section: LT Switchgear . Page:3 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
1.1.25. The tentative power and control cable entries shall be from bottom. However, Purchaser
reserves the right to alter the cable entries, if required, during detailed engineering,
without any additional commercial implication.

1.1.26. Adopter panels and dummy panels required to meet the various busbar arrangements and
layouts required shall be included in Bidder's scope of work.

1.2. DERATING OF EQUIPMENTS

1.2.1. The current ratings of all equipments as specified in the Single Line Diagram For AC &
DC System are the minimum standards current ratings at a reference ambient temperature
as per relevant Indian Standards.

1.3. POWER BUS BARS AND INSULATORS

1.3.1. All AC Distribution Boards shall be provided with three phase buses and a neutral bus
bars and the DC Distribution Boards shall be provided with two busbars.

1.3.2. All busbars and jumper connections shall be of high conductivity aluminium/copper of
adequate size.

1.3.3. The Cross-Section of the busbars shall be uniform through out the length of Switchgear
and shall be adequately supported and braced to withstand the stresses due to the
specified short circuit currents.

1.3.4. All busbars shall be adequately supported by adequate numbers of high strength type
Polyester fibre glass Moulded Insulators to withstand short circuit withstand capability
of panel. Separate supports shall be provided for each phase and neutral busbar. If a
common support is provided anti-tracking barriers shall be provided between the
supports.

1.3.5. All busbars joints shall be provided with high tensile steel bolts. Belleville/spring
washers and nuts, so as to ensure good contacts at the joints. Non-silver plated Busbars
joints shall be thoroughly cleaned at the joint locations and a suitable contact grease shall
be applied just before making a joint.

1.3.6. All busbars shall be colour coded as per IS: 11353-1985: Guide for Uniform System of
Marking and Identification of Conductors and Apparatus Terminals.

1.3.7. The Bidder shall furnish calculations, establishing the adequacy of busbar sizes for
specified current ratings, On the basis of short circuit current and temperature rise
consideration at specified ambient temp.

1.4. EARTH BUS

1.4.1. A galvanised steel earthing shall be provided at the bottom of each panel and shall extend
throughout the length of each switchboard. It shall be welded/bolted to the frame work
of each panel and breaker earthing contact bar vertical bus shall be provided in each
vertical section which shall in turn be bolted/welded to main horizontal ground bus.

1.4.2. The earth bus shall have sufficient cross-section to carry the momentary short circuit and
short time fault currents to earth without exceeding the allowable temperature rise.
Technical Specification, Section: LT Switchgear . Page:4 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
1.4.3. Suitable arrangements shall be provided at each end of the horizontal earth bus for
bolting to Purchaser's earthing conductors. The horizontal earth bus shall project out the
switchboard ends and shall have predrilled holes for this connection. A joint spaced and
taps to earth bus shall be made through at least two bolts.

1.4.4. All non-current metal work of the Switchboard shall be effectively bonded to the earth
bus. Electrical conductivity of the whole switchgear enclosures frame work and the truck
shall be maintained even after painting.

1.4.5. The truck and breaker frame shall get earthed while the truck is being inserted in the
panel and positive earthing of the truck and breaker frame shall be maintained in all
positions. SERVICES & ISOLATED, as well as through out the intermediate travel.

1.4.6. Air Circuit Breaker (ACB) module frame shall get engaged to the vertical earth bus,
before the disconnecting contacts on these module are engaged to the vertical busbar.

1.4.7. All metallic cases of relays, instruments and other panel mounted equipments shall be
connected to earth by independent stranded copper wires of size not less than 2.5 mm2.
Insulation colour code of earthing wires shall be green. Earthing wires shall be
connected to terminals with suitable clamp connectors and soldering is not acceptable.
Looping of earth Connection which would result in loss of earth connection to the
devices when a device is removed is not acceptable. However, looping of earth
connections between equipment to provide alternative paths or earth bus is acceptable.

1.4.8. VT and CT secondary neutral point earthing shall be at one place only, on the terminal
block. Such earthing shall be made through links so that earthing of one secondary
circuit shall be removed without disturbing the earthing of other circuit.

1.4.9. All hinged doors shall be earthed through flexible earthing braid.

1.4.10. Caution nameplate `Caution-Live Terminals' shall be provided at all points where the
terminals are like to remain live and isolation is possible only at remote end.

1.5. AIR CIRCUIT BREAKERS

1.5.1. Circuit breakers shall be three-pole air break horizontal drawout type and shall have
inherent fault making and breaking capacities as specified in "Technical Parameters".
The circuit breakers which meet specified parameter only after provision of releases or
any other devices shall not be acceptable.

1.5.2. Circuit breakers shall be mounted along with it operating mechanism on a wheeled
carriage. Suitable guides shall be provided to minimise misalignment of the breaker.

1.5.3. There shall be `Service', `Test' and `Fully withdrawn positions for the breakers. In `Test'
position the circuit breaker shall be capable of being tested for operation without
energising the power circuits i.e. the power Contacts shall be disconnected while the
Control circuits shall remain undisturbed. Locking facilities shall be provided so as to
prevent movement of the circuit breaker from the `SERVICE', `TEST' OR FULLY
WITHDRAWN' position. It shall be possible to close the door in TEST position.

1.5.4. All circuit breakers shall be provided with 4 NO and 4 NC potentially free auxiliary
contacts. These contacts shall be in addition to those required for internal mechanism of
the breaker. Separate limit switches each having required number of contacts shall be
Technical Specification, Section: LT Switchgear . Page:5 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
 provided in both `SERVICE' & `TEST' position of the breaker. All contacts shall be
rated for making continuously carrying and breaking 10 Amps at 240V AC and 1 Amp
(Inductive) at 220V DC.

1.5.5. Suitable mechanical indications shall be provided on all circuit breakers to show `OPEN'.
`CLOSE', `SERVICE', `TEST' and `SPRING CHARGED' positions.

1.5.6. Main poles of the circuit breakers shall operate simultaneously in such a way that the
maximum difference between the instants of contacts touching during closing shall not
exceed half cycle of rated frequency.

1.5.7. All circuit breakers shall be provided with the interlocks as explained in further clauses.

1.5.8. Movement of a circuit breaker between SERVICE AND TEST positions shall not be
possible unless it is in OPEN position. Attempted with drawl of a closed circuit breaker
shall trip the circuit breaker.

1.5.9. Closing of a circuit breaker shall not be possible unless it is in SERVICE, TEST
POSITION or in FULLY WITHDRAWN POSITION.

1.5.10. Circuit breaker cubicles shall be provided with safety shutters operated automatically by
the movement of the circuit breaker carriage to cover the stationary isolated contacts
when the breaker is withdrawn. It shall however, be possible to open the shutters
intentionally, against spring pressure for testing purpose.

1.5.11. A breaker of particular rating shall be prevented from insertion in a cubicle of a different
rating.

1.5.12. Circuit breakers shall be provided with electrical anti-pumping and trip free feature, even
if mechanical antipumping feature is provided.

1.5.13. Mechanical tripping shall be possible by means of front mounted RED `Trip' push-
button. In case of electrically operated breakers these push buttons shall be shrouded to
prevent accidental operation.

1.5.14. Breaker controlled motors shall operate satisfactorily under the following conditions:

(i) Direct on-line starting of Induction Motors rated 110 kW to 220 kW with a locked
rotor current of seven times the rated current, and starting time of up to 30
seconds.

(ii) Breaking on-load, full load and locked rotor currents of Induction Motors for
rated 100 kW to 220 kW.

1.5.15. Means shall be provided to slowly close the circuit breaker in withdrawn position. If
required for inspection and setting of Contacts, in service position slow closing shall not
be possible.

1.5.16. Power operated mechanism shall be provided with a universal motor suitable for
operation 220V DC Control supply with voltage variation from 90% to 110% rated
voltage. Motor insulation shall be class `E' or better.

1.5.17. The motor shall be such that it requires not more than 30 seconds for fully charging the
closing spring.
Technical Specification, Section: LT Switchgear . Page:6 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
1.5.18. Once the closing springs are discharged, after the one closing operation of circuit
breaker, it shall automatically initiate, recharging of the spring.

1.5.19. The mechanism shall be such that as long as power is available to the motor, a continuous
sequence of closing and opening operations shall be possible. After failure of power
supply at least one open-close-open operation shall be possible.

1.5.20. Provision shall be made for emergency manual charging and as soon as this manual
charging handle is coupled, the motor shall automatically get mechanically decoupled.

1.5.21. All circuit breakers shall be provided with closing and trip coils. The closing coils shall
operate correctly at all values of Voltage between 85% to 110% at rated control voltage.
The trip coil shall operate satisfactorily under all values of supply voltage between 70%
to 110% of rated control voltage.

1.5.22. Provision for mechanical closing of the breaker only in `TEST' and `WITHDRAWN'
positions shall be made.

1.5.23. PROTECTION CO-ORDINATION

1.5.23.1. It shall be the responsibility of the Contractor to fully co-ordinate the overload and short
circuit tripping of the circuit breakers with the upstream and down stream circuit
breakers/fuses/motor starters, to provide satisfactory discrimination.

1.6. MOULDED CASE CIRCUIT BREAKER (MCCB) and MCB

1.6.1. MCCB shall in general conform to IS: 13947 Part-2. All MCCB offered shall have Ics =
100% Icu rating. Type test reports for offered model of MCCB shall be submitted
during detailed engineering for owner’s acceptance.

1.6.2. MCCB shall be flush mounted on the AC/DC distribution boards and shall have
extended handle.

1.6.3 MCCBs shall be provided with thermo-magnetic type release for over current and short
circuit protection. The setting of the thermal release shall be adjustable between 80% to
100% of the rated current. The MCCB shall have breaking capacity not less than 20kA.

1.6.4 MCCBs used for ACDB incomers and Bus coupler shall be equipped with stored energy
mechanism for electrical closing and tripping. All other MCCBs shall be manually
operated. The operating handle should give a clear trip indication.

1.6.5 Miniature circuit breaker (MCB) shall conform to IEC: 898-1987 and IS: 8828.

1.7 RELAYS

1.7.1 All relays and timers in protective circuits shall be flush mounted on panel front with
connections from the inside. They shall have transparent dust tight covers removable
from the front. All protective relays shall have a drawout construction for easy
replacement from the front. They shall either have built-in test facilities, or shall be
provided with necessary test blocks and test switches located immediately below each
relay. The auxiliary relays and timers may be furnished in non-drawout cases.

Technical Specification, Section: LT Switchgear . Page:7 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.7.2 All AC relays shall be suitable for operation, at 50 Hz with 110 volts VT secondary and 1
amp or 5 amp CT secondary.

1.7.3 All protective relays and timers shall have at least two potentially free output contacts.
Relays shall have contacts as required for protection schemes. Contacts of relays and
timers shall be silver faced and shall have a spring action. Adequate number of terminals
shall be available on the relay cases for applicable relaying schemes.

1.7.4 All protective relays auxiliary relays and timers shall be provided with hand reset
operation indicators (Flags) for analysing the cause of operation.

1.7.5 All relays shall withstand a test voltage of 2 KV (rms) for one minute.

1.7.6 Motor starters shall be provided with three element, ambient temperature compensated,
time lagged, hand reset type overload relays with adjustable settings. The setting ranges
shall be properly selected to suit the motor ratings. These relays shall have a separate
black coloured hand reset push button mounted on compartment door and shall have at
least one changeover contact.

1.7.7 All fuse-protected contactor-controlled motors shall have single phasing protection,
either as a distinct feature in the overload relays (by differential movement of bimetallic
strips), or as a separate device. The single phasing protection shall operate even with
80% of the set current flowing in two of the phases.

1.8 CONTACTORS
1.8.1 Motor starter contactors shall be of air break, electromagnetic type rated for
uninterrupted duty as per IS:13947 (Part 4).

1.8.2 Contactors shall be double break, non-gravity type and their main contacts shall be silver
faced.

1.8.3 Direct on line starter contactors shall be of utilisation category AC2. These contactors
shall be as per IS:13947 (Part 4).

1.8.4 Each contactor shall be provided with two (2) normally open (NO) and two (2) normally
close (NC) auxiliary contacts.

1.8.5 Operating coils of contactors shall be of 240V AC Unless otherwise specified elsewhere.
The Contactors shall operate satisfactorily between 85% to 110% of the rated voltage.
The Contactor shall drop out at 70% of the rated voltage.

1.9 INSTRUMENT TRANSFORMERS

1.9.1 All current and voltage transformers shall be completely encapsulated cast resin insulated
type suitable for continuous operation at the temperature prevailing inside the switchgear
enclosure, when the switchboard is operating at its rated condition and the outside
ambient temperature is 50°C.

1.9.2 All instrument transformers shall be able to withstand the thermal and mechanical
stresses resulting from the maximum short circuit and momentary current ratings of the
associated switchgear.

Technical Specification, Section: LT Switchgear . Page:8 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.9.3 All instrument transformer shall have clear indelible polarity markings. All secondary
terminals shall be wired to a separate terminal on an accessible terminal block where star-
point formation and earthing shall be done.

1.9.4 Current transformers may be multi or single core type. All voltage transformers shall be
single phase type. The Bus VTs shall be housed in a separate compartment.

1.9.5 All VTs shall have readily accessible MCBs on both primary and secondary sides.

1.10 INDICATING INSTRUMENTS

1.10.1 All indicating and integrating meters shall be flush mounted on panel front. The
instruments shall be of at least 96 mm square size with 90 degree scales, and shall have
an accuracy class of 2.5 or better. The covers and cases of instruments and meters shall
provide a dust and vermin proof construction.

1.10.2 All instruments shall be compensated for temperature errors and factory calibrated to
directly read the primary quantities. Means shall be provided for zero adjustment without
removing or dismantling the instruments.

1.10.3 All instruments shall have white dials with black numerals and lettering. Black knife
edge pointer with parallax free dials will be preferred.

1.10.4 Ammeters provided on Motor feeders shall have a compressed scale at the upper current
region to cover the starting current.

1.10.5 Watt-hour meters shall be of 3 phase three element type, Maximum demand indicators
need not be provided.

1.11 CONTROL & SELECTOR SWITCHES

1.11.1 Control & Selector switches shall be of rotary type with escutcheon plates clearly marked
to show the function and positions. The switches shall be of sturdy construction suitable
for mounting on panel front. Switches with shrouding of live parts and sealing of
contacts against dust ingress shall be preferred.

1.11.2 Circuit breaker selector switches for breaker Controlled motor shall have three stay put
positions marked `Switchgear', `Normal' and `Trial' respectively. They shall have two
contacts of each of the three positions and shall have black shade handles.

1.11.3 Ammeter and voltmeter selector switches shall have four stayput position with adequate
number of contacts for three phase 4 wire system. These shall have oval handles
Ammeter selector switches shall have make before break type contacts to prevent open
circuiting of CT secondaries.

1.11.4 Contacts of the switches shall be spring assisted and shall be of suitable material to give a
long trouble free service.

1.11.5 The contact ratings shall be at least the following :

(i) Make and carry continuously 10 Amp.

(ii) Breaking current at 220V DC 1 Amp (Inductive)
(iii) Breaking current at 240V AC 5 Amp (at 0.3 pf lagging)

Technical Specification, Section: LT Switchgear . Page:9 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.12 AIR BREAK SWITCHES

1.12.1 Air breaker switch shall be of the heavy duty, single throw group operated, load break,
fault make type complying with IS:13947,Part-3.

1.12.2 The Bidder shall ensure that all switches are adequately rated so as to be fully protected
by the associated fuses during all abnormal operating conditions such as overload, locked
motor, short circuit etc.

1.12.3 Switch operating handles shall be provided with padlocking facilities to lock them in
`OFF' position.

1.12.4 Interlocks shall be provided such that it is possible to open the cubicle door only when
the switch is in `OFF' position and to close the switch only when the door is closed.
However suitable means shall be provided to intentionally defeat the interlocks explained
above.

1.12.5 Switches and fuses for AC/DC control supply and heater supply wherever required shall
be mounted inside and cubicles.

1.13 PUSH BUTTONS

1.13.1 Push-buttons shall be of spring return, push to actuate type. Their contacts shall be rated
to make, continuously carry and break 10A at 240V and 0.5A (inductive) at 220V DC.

1.13.2 All push-buttons shall have one normally open and one normally closed contact, unless
specified otherwise. The contact faces shall be of silver or silver alloy.

1.13.3 All push-buttons shall be provided with integral escutcheon plates marked with its
function.

1.13.4 The colour of the button shall be as follows :

(i) GREEN : For motor START, Breaker CLOSE

(ii) RED : For motor TRIP, Breaker OPEN
(iii) BLACK : For overload reset.

1.13.5 All push-buttons on panels shall be located in such a way that Red-push-buttons shall
always be to the left of green push-buttons.

1.14 INDICATING LAMPS

1.14.1 Indicating lamps shall be of the panel mounting cluster LED type. The lamps shall have
escutcheon plates marked with its function, wherever necessary.

1.14.2 Lamps shall have translucent lamp-covers of the following colours, as warranted by the
application :

(i) RED : For motor ON, Breaker CLOSED

(ii) GREEN : For motor OFF, Breaker OPEN
(iii) WHITE : For motor Auto-Trip
(iv) BLUE : For all healthy conditions (e.g. control supply, and also for
'SPRING CHARGED"
Technical Specification, Section: LT Switchgear . Page:10 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
 (v) AMBER : For all alarm conditions (e.g. overload) Also for
`SERVICE' and `TEST' positions indicators.

1.14.3 Lamps shall be easily replaceable from the front of the cubicle.

1.14.4 Indication lamps should be located just above the associated push buttons/control
switches. Red lamps shall invariable be located to the right of green lamps. In case a
white lamp is also provided, it shall be placed between the red and green lamps along
with the centre line of control switch/push button pair. Blue and Amber lamps should
normally be located above the Red and Green lamps.

1.14.5 When associated with push-buttons, red lamps shall be directly above the green push
button, and green lamps shall be directly above the red push-button. All indicating lamps
shall be suitable for continuous operation at 90 to 110% of their rated voltage.

1.15 FUSES

1.15.1 All fuses shall be of HRC cartridge fuse link type. Screw type fuses shall not be
accepted. Fuses for AC Circuits shall be of class 2 type, 20 kA (RMS) breaking current
at 415 AC, and for DC circuits Class 1 type 4 kA breaking current.

1.15.2 Fuses shall have visible operation indicators.

1.15.3 Fuses shall be mounted on fuses carriers, which are mounted on fuse bases, wherever it is
not possible to mount fuses on carriers fuses shall be directly mounted on plug in type of
bases. In such cases one set of insulated fuse pulling handles shall be supplied with each
switchgear.

1.15.4 Fuse rating shall be chosen by the Bidder depending upon the circuit requirements and
these shall be subject to approval of PURCHASER.

1.16 TERMINAL BLOCKS

1.16.1 Terminal blocks shall be of 750 volts grade and have continuous rating to carry the
maximum expected current on the terminals. It shall be complete with insulating barriers,
clip-on-type/stud type terminals for Control Cables and identification strips. Marking on
terminal strip shall correspond to the terminal numbering on wiring on diagrams. It shall
be similar to `ELEMEX' standard type terminals, cage clamp type of Phoenix or WAGO
or equivalent

1.16.2 Terminal blocks for CT and VT secondary leads shall be provided with test links and
isolating facilities. CT secondary leads shall be provided with short circuiting and
earthing facilities. It shall be similar to `Elem.' `CATD' - Type.

1.16.3 In all circuit breaker panels at least 10% spare terminals for external connections shall be
provided and these spare terminals shall be uniformly distributed on all terminal blocks.
Space for adding another 10% spare terminals shall also be available.

1.16.4 All terminal blocks shall be suitable for terminating on each side, two (2) Nos. of 2.5 mm
square size standard copper conductors.

1.16.5 All terminals shall be numbered for identification and grouped according to the function.
Engraved white-on-black labels shall be provided on the terminal blocks.
Technical Specification, Section: LT Switchgear . Page:11 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
1.16.6 Wherever duplication of a terminal block is necessary it shall be achieved by solid
bonding links.

1.16.7 Terminal blocks shall be arranged with at least 100 mm clearance between two sets of
terminal block. The minimum clearance between the first row of terminal block and the
associated cable gland plate shall be 250 mm.

1.17 NAME PLATES AND LABELS

1.17.1 All switchgears, AC/DC distribution boards, shall be provided with prominent, engraved
identification plates. The module identification plate shall clearly give the feeder number
and feeder designation. For single front switchboards, similar panel and board
identification labels shall be provided at the rear also.

1.17.2 All name plates shall be of non-rusting metal or 3-ply lamicoid with white engraved
lettering on black back ground. Inscriptions and lettering sizes shall be subject to
PURCHASER approval.

1.17.3 Suitable plastic sticker labels shall be provided for easy identification of all equipments,
located inside the panel/module. These labels shall be positioned so as to be clearly
visible and shall give the device number as mentioned in the module wiring drawings.

1.18 SPACE HEATER

1.18.1 Space heater shall be provided in all the boards for preventing harmful moisture
condensation.

1.18.2 The space heaters shall be suitable for continuous operation on 240V AC, 50 Hz, single
phase supply, and shall be automatically controlled by thermostats. Necessary isolating
switches and fuses shall also be provided.

1.19 CONTROL AND SECONDARY WIRING

1.19.1 All switchboards shall be supplied completely wired internally upto the terminal blocks
ready to receive Purchaser's control cables.

1.19.2 All inter cubicle and inter panel wiring and connections between panels of same
switchboard including all bus wiring for AC and DC supplies shall be provided by the
bidder.

1.19.3 All internal wiring shall be carried out with 1100 V grade, single core, 1.5 square mm or
larger stranded copper wires having colour coded, PVC insulation. CT circuits shall be
wired with 2.5 square mm copper wires. Voltage grade and insulation shall be same as
above.

1.19.4 Extra-flexible wires shall be used for wiring to device mounted on moving parts such as
hinged doors.

1.19.5 All wiring shall be properly supported, neatly arranged, readily accessible and securely
connected to equipment terminals and terminals blocks.

1.20 POWER CABLES TERMINATION

Technical Specification, Section: LT Switchgear . Page:12 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.20.1 Cable termination compartment and arrangement for power cables shall be suitable for
stranded aluminium conductor, armoured XLPE/PVC insulated and sheathed, single
core/three core, 1100 V grade cables.

1.20.2 All necessary cable terminating accessories such as Gland plates, supporting clamps and
brackets, power cable lugs, hardware etc. shall be provided by the successful bidder, to
suit the final cable sizes which would be advised later.

1.20.3 The gland plate shall be of removable type and shall cover the entire cable alley. Bidder
shall also ensure that sufficient space is provided for all cable glands. For all single core
cables, gland plates shall be of non-magnetic Material.

1.21 TYPE TESTS

1.21.1 Type tests reports on Panels (Switchgear and Control gear assemblies) as per IS 8623
Part-I shall be submitted for the following tests in line with clause 9.0 of Section GTR :

i) Verification of temperature rise limits

ii) Verification of the dielectric properties
iii) Verification of short circuit strength
iv) Verification of the continuity of the protective circuit
v) Verification of clearances and creepage distances
vi) Verification of mechanical operation
vii) Verification of degree of protection

1.21.2 Contractor shall submit type test reports for the following Switchgear and Control gears
before the fabrication of switchgear is started:
1. Circuit breakers/MCCB as per IS 13947 Part-II
2. Protective Relays as per IEC: 60255.
3. Lighting transformers as per IS:2026
For above equipments, test conducted once are acceptable (i.e. The requirement of test
conducted within last ten years shall not be applicable)

1.22 ERECTION, TESTING AND COMMISSIONING

1.22.1 The Contractor shall unload, erect, install, test and put into commercial use all electrical
equipment included in this specification.

1.22.2 Equipment shall be installed in a neat, workman like manner so that it is level, plumb,
square and properly aligned and oriented. Tolerance shall be as established in
Contractor's drawings or as stipulated by purchaser. No equipment shall be permanently
bolted down to foundations until the alignment has been checked and found acceptable
by the purchaser.

1.22.3 Contractor shall furnish all supervision, labour tools equipment rigging materials, bolts,
wedges, anchors, concrete inserts etc. in proper time required to completely install, test
and commission the equipment.

1.22.4 Manufacturer's and purchaser's instructions and recommendations shall be correctly

followed in handling, setting, testing and commissioning of all equipment.

Technical Specification, Section: LT Switchgear . Page:13 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.22.5 Contractor shall move all equipment into the respective room through the regular door or
openings specifically provided for this purpose. No part of the structure shall be utilised
to lift or erect any equipment without prior permission of Purchaser.

1.22.6 All boards shall be installed in accordance with relevant code of practices and at
Purchaser's instructions. All boards shall be installed on finished surfaces, concrete or
steel stills. Contractor shall be required to install and align any channel sills which form
part of foundations. In joining shipping sections of switchboards together adjacent
housing of panel sections or flanged throat sections shall be bolted together after
alignment has been completed. Power bus, enclosures ground and control splices of
conventional nature shall be cleaned and bolted together being drawn up with torque
spanner of proper size or by other approved means.

1.22.7 All boards shall be made completely vermin proof.

1.22.8 Contractor shall take utmost care in holding instruments, relaying and other delicate
mechanism wherever the instruments and relays are supplied separately they shall be
mentioned only after the associated panels have been erected and aligned. The
packing materials employed for safe transit of instrument and relays shall be removed
after ensuring that panel have been completely installed and to further movement of the
same should be necessary. Any damage shall be immediately reported to Purchaser.

1.22.9 Equipment furnished with finished coats of paint shall be touched by up Contractor if
their surface is specified or marred while handling.

1.22.10 After installation of panels, power and control wiring and connections, Contractor shall
perform operational tests on all switchboards, to verify proper operation of switch-
boards/panels and correctness of all equipment in each and every respect. The cable
opening and cables entries for cables terminating to the panels shall be sealed with fire
sealing materials.

1.23 COMMISSIONING CHECK TESTS

The Contractor shall carry out the following commissioning checks, in addition to the
other checks and tests recommended by the manufacturers.

1.23.1 General

1.23.1.1 Check name plate details according to the specification.

1.23.1.2 check for physical damage.

1.23.1.3 Check tightness of all bolts, clamps, joints connecting terminals.

1.23.1.4 Check earth connection.

1.23.1.5 Check cleanliness of insulators and bushings.

1.23.1.6 Check all moving parts for proper lubrication.

1.23.1.7 Check settings of all the relays.

1.23.2 Circuit Breakers

Technical Specification, Section: LT Switchgear . Page:14 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.23.2.1 Check alignment of breaker truck for free movement.

1.23.2.2 Check correct operation of shutters.

1.23.2.3 Check control wiring for correctness of connections, continuity and IR values.

1.23.2.4 Manual operation of breaker completely assembled.

1.23.2.5 Power closing/opening operation, manually and electrically.

1.23.2.6 Breaker closing and tripping time.

1.23.2.7 Trip free and anti-pumping operation.

1.23.2.8 IR values, minimum pick up voltage and resistance of coils.

1.23.2.9 Contact resistance

1.23.2.10 Simultaneous closing of all the three phases.

1.23.2.11 Check electrical & mechanical interlocks provided.

1.23.2.12 Check on spring charging motor, correct operation of limit switches, and time of
charging.

1.23.2.13 All functional checks.

1.23.3 Current Transformers

1.23.3.1 Megger between winding and winding terminals to body.

1.23.3.2 Polarity test

1.23.3.3 Ratio identification checking of all ratios on all cores by primary injection of current.

1.23.3.4 Spare CT cores, if available, to be shorted and earthed.

1.23.4 Voltage Transformer

1.23.4.1 Insulation resistance test

1.23.4.2 Ratio test on all cores.

1.23.4.3 Polarity test.

1.23.4.4 Line connections as per connection diagram.

1.23.5 Cubicle Wiring

1.23.5.1 Check all switch developments.

1.23.5.2 Each wire shall be traced by continuity tests and it should be made sure that the wiring
is as per relevant drawing. All interconnections between panels/equipment shall
be similarly checked.
Technical Specification, Section: LT Switchgear . Page:15 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
1.23.5.3 All the wires shall be meggered to earth.

1.23.5.4 Functional checking of all control circuit e.g. closing, tripping control, interlock,
supervision and alarm circuit.

1.23.6 Relays

1.23.6.1 Check connections and wiring.

1.23.6.2 Megger all terminals to body.

1.23.6.3 Megger AC to DC terminals.

1.23.6.4 Check operating characteristics by secondary injection.

1.23.6.5 Check minimum pick up voltage of DC coils.

1.23.6.6 Check operation of electrical/mechanical targets.

1.23.6.7 Relays settings.

1.23.6.8 Check CT and VT connections with particular reference to their polarities for directional
relays, wherever required.

1.23.7 Meters

1.23.7.1 Check calibration by comparing it with a sub-standard.

1.23.7.2 Megger all insulated portions.

1.23.7.3 Check CT and VT connections with particular reference to their polarities for power
type meters.

1.24 SPECIAL TOOLS AND TACKLES

1.24.1 The Bidder shall include in his proposal any special tools and tackles required for
erection, testing commissioning and maintenance of the equipments offered.

1.24.2 The list of these special tools and tackles shall be given in the bid proposal sheets
alongwith their respective prices.

1.24.3 The total price of the special tools and tackles shall be included in proposal sheets.

1.25 EQUIPMENT TO BE FURNISHED

1.25.1 The Bidder shall quote for various AC/DC distribution boards in accordance with this
specification.

1.25.2 Standard scheme of interconnection of switchboards and distribution boards alongwith

tentative feeder disposition for each board is indicated in Standard SLD of AC & DC
system enclosed alongwith bid documents. The bidder shall quote board prices on the
basis of standard SLD and their estimation of feeders for entire present and future bays

Technical Specification, Section: LT Switchgear . Page:16 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
 requirement. Any other feeder required as per system requirement for efficient and
reliable operation shall be deemed to be included in bidder's scope.

1.25.3 The Bill of Materials for each type of module shall be as under. These are minimum
indicative requirement of the system. The necessary auxiliary relays, push buttons and
indicating lamps shall be provided as per scheme requirement. Any other
item/component required with in a module for efficient and reliable operation shall be
deemed to be included in bidder's scope.

1.25.4 Module Type AE (Electrically controlled circuit breaker for incoming and Bus Coupler
Circuit).

(i) One (1) Triple pole air circuit breaker complete with all accessories and
power operated mechanism as specified.

(ii) Two (2) Neutral link.

(iii) Three (3) Current Transformer for metering.

(iv) One (1) Ammeter with selector switch.

(v) Three (3) Current Transformer for relaying.

(vi) One (1) Triple pole instantaneous over-current relay having the
setting range of 200-800% or 500-2000% of CT secondary
and adjustable definite minimum time.

(vii) One (1) Instantaneous earth fault relay having an adjustable setting range
of 10-40% or 20 - 80% of CT secondary current and adjustable
definite minimum time. The earth fault relay shall be provided
with a stabilising resistor.

(viii) One(1) set Current and Voltage transducers.

(ix) One(1) set High speed tripping relays.

1.25.5 Module Type - M1 (Circuit Breaker Controlled Motor Feeder)

(i) One (1) Triple pole Air Circuit Breaker complete with accessories,
and power operated mechanism as specified.

(ii) One (1) Three position 6 pole selector switch

'SWITCHGEAR/NORMAL /TRIAL'.

(iii) Three (3) Current Transformer for metering.

(iv) One (1) Ammeter with Ammeter Selector Switch

(v) Three (3) Current Transformer for relaying.

(vi) One (1) Triple pole instantaneous over-current relay for providing
positive sequence current protection in all the three phases.
The relay setting range shall be continuously adjustable
between 200-800% or 400-1600% of CT secondary rated
current as required.
Technical Specification, Section: LT Switchgear . Page:17 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
 (vii) One (1) Double pole inverse definite minimum time over current
relays connected in R & B phases for over current protection
of motor rated 110 kW - 200 kW. The relay shall have an
adjustable setting range of 50% - 200% of CT Secondary
current and time setting range of 0-30 Second. The relay
shall be CDGM-22 of EE or equivalent.

(viii) One (1) Single pole adjustable definite time delay relay for motor
overload alarm connected in Y-phase only. The relay shall
have resetting ratio of not less than 90%. The relay shall have
continuously adjustable time delay range of 2.5 to 25 Sec.

(ix) One (1) Instantaneous earth fault relay having an adjustable setting
range of 10-40% or 20-80% of CT secondary current. The
earth fault relay shall be provided with a stabilising resistor.

(x) One(1) set Current and Voltage transducers.

(xi) One(1) set High speed tripping relay.

1.25.6 Module Type E

(i) One (1) Four pole MCCB

1.25.7 Module G-1 (VT Module with under Voltage Relay)

(i) Three (3) 415 / 110 volts single phase voltage transformer star/star
√3 √3
connect with star point solidly earthed mounted on common
draw out chassis. Accuracy Class 0.5 for protection and
metering with 50VA Burden.

(ii) Six (6) HRC Fuses mounted on the above chassis.

(iii) One (1) Four position voltmeter selector switch.

(iv) One (1) Voltmeter (0-500V)

(v) One (1) Double pole instantaneous under voltage relays with
continuous variable setting range of 40-80% of 110 Volts.

(vi) One (1) Time delay pick up relay having a time setting range of 0.5
to 3 secs. with 3 `NO'. Self reset contacts, suitable for 220V
DC.

(vii) One (1) Auxiliary relay 220V DC with 2 NO. self reset contacts.

(viii) Three (3) Indicating lamps with series resistor and colour lenses (Red,
Blue & Yellow).

1.25.8 Module Type G-2

Technical Specification, Section: LT Switchgear . Page:18 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
 (i) Three (3) HRC Fuse

(ii) One (1) Voltmeter (0-500V)

(iii) One (1) Voltmeter selector switch four position (R-Y, Y-B, B-R
OFF).

(iv) Three (3) Indication lamps (Red, Blue & Yellow)

1.25.9 Module Type H & H (BC) (Isolating Switch Controlled Incoming Circuit)

(i) One (1) Four pole MCCB

(ii) One (1) Red Indicating lamp to indicate isolating switch closed
position.

1.25.10 Module Type S : (DC Metering and Protection Module)

(i) One (1) Voltmeter 300-0-300V DC for 220V DC DB/Voltmeter 0-

75V DC for 50V DCDB

(ii) One (1) Three (3) position voltmeter selector switch

(iii) One (1) Instantaneous under voltage relay with 95% of 220V DC.
The resetting ratio of relay of relay should not be more than
1.25. The relay shall be provided with a series resistor and
a push button across if for resetting (pick up) the relay at
about 105% of the drop out voltage.

(iv) One (1) Instantaneous over voltage relay with setting range of 110%
of 220V DC. The resetting ratio of relay should not be less
than 0.8. The relay shall have a push button in series of
resetting the relay at about 95% of the operating voltage.

(v) One (1) Earth leakage relay only for 220V DC system having
adjustable pick up range between 3 to 7 milliamps the relay
shall be suitable for 220V DC/240V AC Auxiliary supply.

1.25.11 Module Type X

One (1) Double pole 250 V MCB

1.25.12 Module Type-DC (Incomer from Battery & Chargers)

(i) One (1) Double pole 250V DC MCCB for incomer from Battery.

(ii) One (1) DC ammeter with shunt and range of 90-0-400 Amps. For
220V DC DB and 90-0-200 Amp for 50V DC DB.

(iii) Two (2) Double pole 250V DC MCCB/MCB

(iv) One (1) Double pole single throw 250V DC air break switch
connecting battery & charger sections to DC DB.
Technical Specification, Section: LT Switchgear . Page:19 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
 (v) One(1) set Voltage and Current Transducers

1.25.13 Module Type DG-1 (Electrically Controlled Circuit Breaker for Incomer from DG
Set)

a) One (1) Triple pole circuit breaker complete with all accessories
and power operated mechanism as specified.

b) One (1) Frequency meter.

c) One (1) Voltmeter with selector switch.

d) One (1) Remote/Local Selector switch.

e) Three (3) Current transformer for metering.

f) Six (6) Current Transformers for differential protection (out of this

3 Nos. will be supplied loose for mounting in DG set panel).

g) Three (3) Current transformer for relaying.

h) One (1) Ammeter Selector Switch.

i) One (1) Ammeter

j) One (1) Wattmeter of range 0-300 KW.

k) One (1) Three pole voltage controlled definite time delay relay
having current setting range of 50-200% of CT secondary
current and adjustable time delay 0.3 to 3 secs.

l) One (1) Watt hour meter with six (6) digits and minimum count of
one (1) kwh.

m) One (1) Single pole definite time over current relay having a
continuous setting range of 50-200% of CT secondary current
and a time delay of 2.5-25 secs connected in CT of Y phase
for overload alarm. The relay shall have a setting ratio of
not less than 90%.

n) One (1) Three pole differential protection relay having an operating

current setting range of 10-40% of generator full load
current. The relay shall be of high impedance type, with
necessary stabilizing resistors.

o) Two (2) Push buttons for Remote starting & stopping of DG Set (Red,
Green).

p) One(1) set Current and Voltage transducers.

q) One(1) set High speed tripping relays.

Technical Specification, Section: LT Switchgear . Page:20 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.25.14 Module Type H1

One (1) Double pole DC Switch with pad locking facility in off position.

1.25.15 Module Type EL

(i) One (1) Four pole MCCB

(ii) One (1) Contactor

(iii) Electronic Timer suitable for continuous operation, push button and selector
switch be as per scheme requirement

1.26 PARAMETERS

1.26.1 Power Supply

1.26.1.1 AC System 3 phase, 4 wire, solidly earthed

a) Voltage 415 Volts, ± 10%

b) Frequency 50 Hz ± 5%

c) Combined variation ± 10% Absolute Sum

in Voltage & frequency

d) Fault Level 20 kA (rms)

1.26.1.2 DC System 2 Wire, unearthed

a) System 220V ± 10%

voltage

b) Fault Level 4 kA

c) System 48 V ± 10%
Voltage

d) Fault Level --

1.26.2 Control Supply Voltage

a) Trip and closing 220V DC Unearthed

coils

b) Spring charging 220V DC Unearthed

1.26.3 Cubicle Data

1.26.3.1 Busbar Rating

a) Continuous As specified in Standard SLD

Technical Specification, Section: LT Switchgear . Page:21 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
 for Vertical panels. For AC & DC system.

b) Short time (1 sec. 20 kA

kA (rms)

c) Momentary (kA) 45 kA
PEAK

d) Ambient Temperature 50°C

e) One Minute Power Frequency Withstand

I. Power Circuit 2500 Volts (rms)

II. Control Circuit 2500 Volts (rms)

1.26.3.2 Cubicle Colour Finish

a) Interior Smoke Grey shade No.692 of IS:5

b) Exterior Smoke Grey shade No.692 of IS:5

1.26.4 Circuit Breaker

a) Type Air Break

b) No. of poles 3

c) Voltage & Frequency 415 ± 10%, 50 HZ + 5%

d) Rated Operating Duty As per IS

e) Rated service short-circuit 20 kA (RMS)

Breaking capacity (Ics)

f) Short Circuit 45 kA (Peak)

making current

g) Short time withstand 20 kA (RMS) for 1 sec.

current for 1 sec.
duration.

h) Operating Mechanism 20 kA (RMS) for 1 sec.

current for 1 sec.
duration.

i) No. of auxiliary 4 NO & 4 NC contacts for Purchaser's

contacts use on fixed portion of the cubicle

j) Short Circuit
breaking current

I. AC Component 20 kA (RMS)

II. DC Component As per IS: 13947 (Part 2)

Technical Specification, Section: LT Switchgear . Page:22 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
1.26.5 MOULDED CASE CIRCUIT BREAKER
AC System DC System

a) No. of poles 4 2

b) Voltage & Frequency 415 ± 10%, 250V

50 HZ + 5%

c) Rated Operating Duty As per IS

d) Rated service short-circuit 20 kA (RMS) 4 kA

Breaking capacity (Ics)

e) Short Circuit 45 kA (Peak) -

making current

f) No. of auxiliary 1 NO &1 NC 1 NO &1 NC

Contacts ( only for incomer
And bus-coupler MCCBs)

g) Rated Ultimate Short Circuit

breaking capacity

I. AC Component 20 kA (RMS) As per IS

II. DC Component As per As per

IS 13947 IS 13947
1.26.6 Meters

a) Accuracy class 2.5

b) One minute power 2.0

frequency withstand
test voltage in KV

1.26.7 Current Transformers

a) Type Cast resin, Bar primary

b) Voltage class and 650V, 50 Hz

frequency

c) Class of Insulation E or better

d) Accuracy Class 1, VA adequate for application

class metering CT but not less than 7.5 VA.

e) Accuracy class 5 P 15, VA adequate for application,

protection CT but not less than 7.5 VA.

f) Accuracy class PS, KPV = 300V

differential
protection

Technical Specification, Section: LT Switchgear . Page:23 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
 g) Short Time Current Rating
(for CTs Associated with
circuit breakers)

I. Current 20 kA (RMS)

II. Duration One Second

III. Dynamic Rating 45 kA (Peak)

IV. One minute power 2.5 kV (rms)

frequency withstand
test voltage.

1.26.8 Voltage Transformer

a) Type Cast Resin

b) Rated Voltage

Primary 415/√3 V

Secondary 110/√3 V

c) Method of connection

Primary Star

Secondary Star

d) Rated voltage factor 1.1 continuous, 1.5 for 3 seconds

e) Class of insulation E or better

f) One minute power 2.5 KV (RMS)

frequency withstand
voltage

g) Accuracy class 0.5, not less than 20VA

1.26.9 Relay

a) One minute power 2 kV (rms)

Frequency withstand test

1.26.10 Transducers (1 phase) Current Voltage

a) Operating Voltage 220 V DC 220V DC

b) I/P 1A. 110V AC

c) O/P 4-20 mA 4-20 mA

d) Type Analogue Analogue

Technical Specification, Section: LT Switchgear . Page:24 of 26
C/ENGG/SPEC/LTSWGR Rev. No: 5
1.26.11 Lighting Transformers

Lighting transformers shall be of 300 KVA rating ( in case of substations where

highest voltage is 765 kV)/ 100 KVA rating ( in case of substations where highest
voltage is 400 kV)/ 25 KVA rating (in case of substations where highest voltage level is
132kV), 415/415 V, 3 phase, 50 Hz Dry type natural air cooled type. The technical
parameters of these lighting transformers are as follows:

Technical Parameters of Lighting Transformer

Type of transformer : Dry type natural air cooled

Rating : 300 KVA, 100 KVA or
25 KVA (as applicable)
Voltage ratio : 415/415 volts
No. of phases : Three
Frequency : 50 Hz
Winding connection : Dyn-1
Class of insulation : 'B' class
Impedance : 4% ± 10%
No. of taps & steps : 5, ± 5% in steps of 2.5%
Ref. standard : IS:2026

1.27 AUTOMATIC CONTROL OF OUTDOOR LIGHTING

1.27.1 EL-type module of 415V Main lighting distribution board and Emergency lighting
distribution board and shall be controlled by timer and contactor module to facilitate its
operation automatically.

1.28 AUTOMATIC SUPPLY CHANGEOVER

Automatic changeover between Incomer I, Incomer II, and DG set is to be carried out
during the failure of supply in one/or both the incomers. After the restoration of the
supply, system shall be restored to normal condition automatically. The requirement of
changeover under various conditions are as below:

(i) Under normal conditions i.e. when supply is available in both the incomers, incomers
I&II of 415 V Main switchboard, ACDB shall be in closed condition and Bus
couplers and DG set breaker shall be in open condition.

(ii) In case of failure of either of the sources, the incomer of that source shall trip and Bus
coupler shall get closed. On restoration of supply, normal conditions described above
are to be established automatically.

iii) In case of failure of supply in both the sources, both incomers, incomers of ACDBs
and ACDB Bus coupler shall trip and DG set breaker switched on.
On restoration of one or both sources, DG set breaker shall trip, DG set stopped and
conditions described in paragraph (i) /(ii) shall be restored.

Technical Specification, Section: LT Switchgear . Page:25 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
 To avoid unnecessary operation of switchgear for momentary disturbances all
changeovers from one state to another shall be initiated after a time delay, after the
conditions warranting such change has been detected.

1.29 ANALOGUE INPUTS

LT System shall have provision of following analogue inputs for owner’s substation
automation purpose. These analogue inputs shall be generated by distinct transducers
to be provided in respective modules. These inputs shall be wired up to respective
terminal blocks.

ANALOGUE INPUTS:

i) Voltage R-Y, Y-B, B-R of Main Switch Board section-I

ii) Voltage R-Y, Y-B, B-R of Main Switch Board section-II
iii) Current from LT transformer-I
iv) Current from LT transformer-II
v) Voltage of 220V DCDB-I
vi) Voltage of 220V DCDB-II
vii) Current from 220V Battery set-I
viii) Current from 220V Battery set-II
ix) Voltage of 48V DCDB-I
x) Voltage of 48V DCDB-II
xi) Current from 48V Battery set-I
xii) Current from 48V Battery set-II

1.30 DIGITAL (Potential Free) INPUTS:

LT System shall have provision of following digital inputs for owner’s substation
automation purpose. These digital inputs shall be made available in the form of
potential free contacts to be provided in respective modules. These potential free
contacts shall be wired up to respective terminal blocks.

i) Main ( MSB) Incomer-I breaker On/Off

ii) Main (MSB) Incomer-II breaker On/Off
iii) Main(MSB) 415V Bus-I/II U/V
iv) Main (MSB) bus coupler breaker on/off
v) DG set breaker on/off
vi) LT transformer-I Bunchholz Alarm & trip
vii) LT transformer-II Buchloz Alarm & trip
viii) LT transformer-I WTI Alarm & trip
ix) LT transformer-II WTI Alarm & trip
x) LT transformer-I OTI Alarm & trip
xi) LT transformer-II OTI Alarm & trip
xii) 220 V DC-I earth fault
xiii) 220V DC-II earth fault

Technical Specification, Section: LT Switchgear . Page:26 of 26

C/ENGG/SPEC/LTSWGR Rev. No: 5
Model Technical Specification For RTU and LDMS

MODEL TECHNICAL SPECIFICATION

FOR

REMOTE TERMINAL UNIT (RTU)

&
LOCAL DATA MONITORING SYSTEM (LDMS)

Page 1 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

INDEX

1. GENERAL INFORMATION 4
2. REMOTE TERMINAL UNIT REQUIREMENTS 5
2.1. Redundancy in CPU and Power supply 6
2.2. Communication Interface 6
2.2.1. Master Station Communication Interface 7
2.2.2. Modems (Applicable in case of RTU communicating on PLCC) 7
2.2.1. Portable Configuration & Maintenance terminal Interface 8
2.3. Master Station Communication Protocol 8
2.3.1. Communication Channel Control 9
2.3.2. Exception Reporting 9
2.3.3. Message Security 9
2.3.4. Control Security 9
2.3.5. Data Concentrator Communication Protocol 10
2.4. Communication interface between RTU & MFT/Energy Meters 10
2.5. Communication Protocol between RTU & IEDs 10
2.6. Analog Inputs 11
2.7. Digital Status Inputs 11
2.7.1. Two-State Devices 12
2.7.2. Momentary Change Detection 12
2.7.3. Digital Telemetry 12
2.7.4. RTU Sequence of Events (SOE) Collection 12
2.8. Digital Control Outputs 13
2.8.1. Two-State Control 13
2.8.2. Raise/Lower Pulse Outputs 13
2.8.3. Control Output Relays 14
2.8.4. RTU Control Security and Safety Requirements 14
2.8.5. Control Disable 14
2.8.6. Dummy breaker relay 15
2.9. Analog Outputs 15
2.10. Time Synchronization 15
2.11. Spare Parts 15

Page 2 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

2.12. Power Supply 16

2.12.1. Power Supply Protection 16
2.12.2. Power Supply Failure Indicators 16
2.13. RTU Panel 16
2.14. Interconnections 17
2.15. Panel Internal Wiring 17
2.16. Terminal Blocks 17
2.17. Assembly and Components Identification 17
2.18. Noise Level 18
2.19. Environmental Requirements 18
2.20. Availability 18
2.21. RTU Size and Expandability 18
2.22. Maintainability 18
3.0 LOCAL DATA MONITORING SYSTEM (LDMS) 20
4.0 SOFTWARE REQUIREMENTS 21
4.1 Design Characteristics 21
4.2 Operating System 21
4.3 Initialization/Restart Program 21
4.4 RTU Operations Monitoring 21
4.5 RTU Configuration Support 22
4.6 Diagnostic Software 22
4.7 Software Deliverables 22
5.0 INSPECTION AND TEST 23
5.1 Inspection 23
5.2 Test Procedures 24
5.3 Test Records 24
5.4 Factory Tests 25
5.5 Field Performance Tests 27
6.0 TRAINING AND SUPPORT SERVICES 29
6.1 RTU and LDMS Training 29
6.1.1 Attendance 29
6.1.2 Training Schedule 29
6.1.3 Training Location and Classrooms 29
7.0 DOCUMENTATION 30
7. 1 Hardware Documentation 30
7..2 Software Documentation 30
Annexure A 31
Annexure B 32
Annexure C 33

Page 3 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

1. GENERAL INFORMATION

This document contains the specifications for the Remote Terminal unit (RTU),
Local Data Monitoring System (LDMS) and associated equipment. The Bidder
shall provide the complete RTU and LDMS under the scope of supply.

The dual output type transducers/MFTs/Energy Meters are included in the Control
and Relay panels and Remote Tap Changer Control (RTCC) Panels. One of the
output from these transducers shall be used for wiring to the RTU. Similarly
potential free contacts for status signal from control and relay panels are to be
used for further wiring to RTU. The Bidder shall be responsible for supplying all
hardware, software, installation, cabling and field implementation for RTU and
LDMS as defined in this Specification. The Bidder shall also provide complete
documentation, training and testing to fully support the hardware and software
provided.

Owner may not initially procure all capabilities specified in this document for RTU.
Regardless of the RTU configuration purchased, the RTU shall be capable of
providing all functions specified herein with the addition of the necessary hardware
and software modules in the field when required by Owner.

Should the Bidder elect to subcontract manufacturing, installation, testing &

commissioning or any other work defined herein, it shall remain the Bidder's
responsibility to manage the complete assigned work.

The RTU shall be used for real-time supervision and control of substation/ power
plant through owner’s Control centres.

See Exhibit 1-1 for a block diagram of the RTU its interface.

It is Owner's intent that the Bidder uses as much standard hardware and software
as possible; however, all of the functional requirements of this Specification must
be satisfied. The use of the Bidder's standard hardware and software may cause
the Bidder to conclude that there is a need for additional items not specifically
mentioned in this Specification. The Bidder shall supply all such items and provide
a complete RTU and LDMS design that meets all of the Owner's functional
requirements defined in this Specification.

In event of the configuration of RTU given in specification undergo changes during

detailed engineering, the prices of particular RTU shall also be adjusted based on
the unit prices of, Input cards, output cards, Interposing relays and Modems only
as indicated in the price schedules for spares.
.

Page 4 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

Exhibit 1.1
Remote operation Back
Printer IEC 60870-5- up
IEC 60870-5- 101/104 RLDC
101/104

P P I/ I/ I/ I/ I/ I/ I/ I/ C
P
C
P
Maintenanace
S S O O O O O O O O U
/
U
/
port
C C
O O
C C C C C C C C C C M
M
M
M
A A A A A A A A A A C C
R R R R R R R R R R A
R
A
R
D D D D D D D D D D D D

MFT/ MFT/ MFT/ MFT/

Energy Energy Energy Energy *Modbus/
Meter/ Meter/ Meter/ Meter/ *IEC 61850
IED IED IED IED

IEC 60870-5-
101/104
IEC 60870-5-104

Main
RLDC
LDMS
Printer
* Note:- No. of Ports as required.

2. REMOTE TERMINAL UNIT REQUIREMENTS

This Sub-section describes the overall functions to be performed by the RTU.

Each function is presented in sufficient detail to provide the Bidder with as much
insight as possible into both the initial and future requirements of the RTU. RTU
shall be capable of providing all functional capabilities described herein even if a
function is not initially implemented.

As a minimum, the RTU shall be capable of performing the following functions:

(a) Collecting, processing and transmitting status changes, accumulated

values, and analog values
(b) Receiving and processing digital commands from the master sta-
tion(s)
(c) Accepting polling messages from the master station(s)
(d) Supporting data transmission rates from 300 to 9600 bits per
second.for IEC 60870-5-101 Protocol or 9600 to 2Mbps for IEC
60870-5-104 Protocol
(e) MODBUS coomunication interface with the Multi function
Transducers(MFT)/Energy Meters over RS485 interface and IEC
61850 protocol with IEDs.

Page 5 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

(f) Include typical communication ports as per layout given in Exhibit

1.1. However the details will be finalised during Engineering
(g) Support multiple concurrent protocols, including the IEC 870-5-T101
and 104 protocol .
(h) Acting as a data concentrator for collecting data from Slave RTUs using
IEC 60870-5-101 protocol
(i) Redundant Central Processing unit and Power supply unit

2.1. Redundancy in CPU and Power supply

The RTU shall be provided with redundant CPUs and Power Supply Unit so that
the RTU can communicate with all masters even when one of the redundant units
fails. A failover process shall cause the assignment of all the functions of the failed
unit to the healthy unit. The failover between the two redundant units shall be
transparent and shall not require any manual intervention.

The failover process of the Power Supply Units shall not cause any interruption in
the functioning of the RTU.

The failover of process of the CPU shall be completed within 30 seconds of the
failure of the primary CPU. All the functions in the RTU shall be operational within
30 seconds of the failover operation i.e. one minute from the time of failure

2.2. Communication Interface

The RTU shall utilize communication ports as follows :

(a) Two ports for redundant connectivity to RLDCs. (Communication on

IEC 60870-1-101 or IEC 60870-5-104 to be decided during detailed
Engineering)
(b) One port for a Local Data Acquisition and Monitoring System
(LDMS).
(c) At least one Ethernet port supporting IEC 60870-5-104 protocol in each
CPU.
(d) Two port for RCC for Remote Operation
(e) One port for the RTU configuration & maintenance terminal.

The typical communication ports has been shown in the Exhibit 1.1.

The communication interface to the master stations shall allow scanning and
control of defined points within the RTU independently for each master station.
The RTU shall respond to independent scans and commands from Owner's
master stations, RTU Maintenance and Configuration Terminal and LDMS/RCC.
The RTU shall support the use of a different communication data exchange rate
(bits per second), scanning cycle, and/or communication protocol to each master
station.

Page 6 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

Also, each master station's data scan may be different for different data points
within the RTU's database.

All ports shall be accessible to Owner to attach the interface equipment and to
provide access for the maintenance, test and monitoring equipment.

2.2.1. Master Station Communication Interface

Owner will supply communication channels between the RTU and the SCADA
system master stations. The communication channels are not part of RTU and
LDMS/RCC scope of supply. The communication channels provided will consist
of power line carrier, microwave, optical fibre, VSAT and cable communication
using modems specified below.

2.2.2. Modems (Applicable in case of RTU communicating on Analog

PLCC)

The Bidder shall supply two (2) number modems along with each RTU (at RTU
end) for communicating with the master station. The corresponding two number
modems shall also be supplied by the Bidder for remote end. The remote end
modems shall be of standalone type (with power supply unit ) and can be located
either at the Control centre or at wideband communication node. A single modem
combining all of the characteristics defined below is preferred such that changing
the communication data rate shall only require reconfiguration of the RTU modem.

The modems shall not require manual equalization and shall include self-test
features such as manual mark/space keying, analog loop-back, and digital loop-
back. The modems shall provide for convenient adjustment of output level and
receive sensitivity. The configuration of tones and speed shall be programmable
and maintained in non-volatile memory in the modem.

The modems shall meet the following requirements:

(a) Use CCITT Standards including V.24, V.28, V.52, and V.54.

(b) Communicate data rates of 300, 600 and 1200 bits per second.

(c) Use CCITT V.23, R35, R.37, R.38a, and R.38b standard tones for the
selected RTU data rate.

(d) Use frequency shift keying (FSK) modulation.

(e) Use both 2-wire and 4-wire communication lines.

(f) Receive level adjustable from 0 to -40 dBm @ 600 ohms.

(g) Transmit level adjustable from 0 to -24 dBm @ 600 ohms.

Page 7 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

(h) Have a minimum sensitivity of -48 dBm.

(i) PLCC modem shall use bandwidth upto 4khz and shall accommodate
multiple data channels over and above voice channels. It shall conform to CCITT-
38 standards.

2.2.3. Portable Configuration & Maintenance terminal Interface

The interface shall provide easy access to allow Owner to use the maintenance
terminal at the RTU installed in the field. The contractor shall provide the RTU
configuration and maintenance software and its associated license for using it
on window based PCs. The software shall be provided on CD /electronic media.
The desktop/laptop PC at control centre end , shall be used for RTU configuration
and maintenance purpose. The RTU configuration and maintenance software
shall include the following features:

(a) RTU configuration capabilities.

(b) RTU diagnostics (for processor, memory, I/O ports and any other functional
area ).
(c) RTU database compilation.
(d) RTU configuration listing and display of memory table contents.

2.3. Master Station Communication Protocol

RTU shall be provided with IEC 60870-5-101 as well as IEC 60870-5-104 protocol
a communication protocol for communicating with Owner's master stations The
communication protocol shall support all the requirements of this standard. The
communication protocol shall be non-proprietary and the Bidder shall provide
complete description and documentation of the protocol to Owner. The
interoperatibility profile for RTU as implemented at RLDC master is given at
Appendix-C of this document. The bidder’s scope shall include implementation of
RTU protocol exactly in-line with the protocol implemented for RLDC SCADA
system and integration of this RTU communication port with RLDC. The Bidder
has to define RTU database as per the requirements of RLDC. Necessary
information in this regard shall be provided by Owner during detailed engineering.

The communication interface to the master station(s) shall allow scanning and
control of defined points within the RTU independently for each master station
using a logical database in the RTU. It shall be possible to pick points from the
RTU database randomly and assign it for reporting to a Master station. Further,
the RTU shall support the use of a different communication data exchange rate
(bits per second), scanning cycle, and/or communication protocol to each master
station.

Page 8 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

2.3.1. Communication Channel Control

The RTU shall perform as a slave on the communication channel to Owner's

Master Stations. All communication shall be initiated by the SCADA system
master stations. Where the RTU must notify the master stations of an unusual
condition at the RTU (such as a power fail/restoration or RTU malfunction) or must
initiate the transfer of changed data, the notification shall be accomplished within
the framework of the periodic data acquisition exchanges.

2.3.2. Exception Reporting

The RTU communication protocol shall report status changes by exception. The
communication protocol shall also support an integrity scan of all status data by
master stations regardless of the lack of any change data.

2.3.3. Message Security

Each RTU communication message shall include an error code, the use of which
shall result in a very low probability of an erroneous message being accepted as
valid. The error code shall be determined and appended to the message for all
messages transmitted by the RTU and verified by the RTU for all messages
addressed and received by the RTU. Cyclic error detection codes such as CRC
are required.

High data integrity and consistency is required of the RTU protocols. The
protocols used shall provide an adequately low Residual Error Rate (RER),
depending on the Bit Error Rate (BER) of the line in use. The minimum required
RER is as specified for the IEC 870-5-101 protocol with the T-101 profile. This
requires the following integrity:
BER RER
10-5 10-14
-4
10 10-10
-3
10 10-6

The implemented protocol shall ensure satisfactory performance at Bit Error Rate of
1x10 -4.

2.3.4. Control Security

RTU shall operate in remote control mode i.e. Supervisory Control shall be
exercised through one of the master station and the remaining Master Station
shall be used for display of information only. The operation of control outputs shall
use a true select-check-before-execute command sequence between the RTU
and the Master Station. The sequence shall include, as a minimum, the following
functional capabilities:

Page 9 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

The Master Station shall transmit a control selection message

addressing the proper RTU and control point within the RTU,
and indicate the control action desired (such as Close).

The RTU shall initialize its control logic, reassemble the control
selection message received , and transmit the reassembled
message to the Master Station. The information in the
message sent to the Master Station shall be generated by the
RTU point-selection logic indicating that the point and control
function have been selected. It shall not be a simple repeat of
the Master Station message transmission.

The Master Station will verify the returned message with the
message sent and, if valid, shall issue an execute control
message to the RTU.

The RTU shall only operate the control point selected after the
check-before-execute sequence above has been performed
without error or interruption by any other messages. The RTU
shall reset its control logic upon any error in the sequence or if
the execute message is not received within a set time (user
adjustable from 2 - 20 seconds) after the command message
is received at the RTU.

2.3.5. Data Concentrator Communication Protocol

The RTU shall act as a IEC 60870-5-104 protocol master and collect data and
also allow control on the existing RTUs on IEC 60870-5-101 protocol (if provided
by the Employer) and communicate it to the SCADA system at Master control
centre.

The Contractor is responsible for making any necessary modification in his

implementation of the communication protocol, if required, for the successful
integration of the existing RTU. The detail of the protocol implementation of
the existing RTU on IEC 60870-5-101 protocol is attached at Annexure-C.

2.4. Communication interface between RTU & MFT/Energy Meters

The RTU shall acquire data from the MFTs / Energy meters using the MODBUS
protocol. The MFTs / energy meters will act as slave to the RTU. The RTU shall
have the ability of issuing retry scan to acquire data from the MFTs / Energy
Meters in case of communication failure between RTU and MFTs/energy meters.

2.5. Communication Protocol between RTU & IEDs

The RTU shall use the IEC 61850 protocol for communication with IEDs over Sub-
station LAN. The RTU shall act as a Client and collect data from the IEDs.

Page 10 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

The RTU shall store data acquired from the MFTs & IEDs in its database and do
processing like change detection/deadband processing on the data for optimizing
its transmission to the Master station (SCADA Control Centre). The processing
shall include necessary mapping of information to the protocol requirement for
communication with Control Center.

2.6. Analog Inputs

The RTU shall accommodate analog current inputs which are isolated, uni-polar
or bipolar, 2-wire ungrounded differential signals with full resolution as follows:

(a) +4 to +20 mA

(b) 0 to +10 mA

(c) -10 to +10 mA.

The analog input accuracy shall be 99.8% or better at 25 deg.C ambient

temperature. Mean accuracy shall drift no more than 0.002% per deg C within the
temperature range of -5 to +50 deg. C. Determination of accuracy shall be made
while the analog multiplexer is operating at rated speed. The analog-to-digital
converter shall have a minimum resolution of 2048 counts (sign plus 11 data bits).

Each input shall have surge protection and filtering to provide protection against
voltage spikes and residual current at 50 Hz, 0.1 ma (peak-to-peak). Overload of
up to 50% of the input shall not sustain any failures to the input.

The RTU shall make all appropriate signal level conversion and conditioning to
allow full utilization of analog inputs and meaningful reasonability checking.
Including signal conditioning components, the input impedance shall not be
greater than 250Ω. Input scaling shall allow for 20% over range.

2.7. Digital Status Inputs

The digital status input interface shall be capable of accepting isolated wet or dry
contact status inputs. The Bidder shall supply necessary sensing voltage, current
limiting, optical isolation, and debounce filtering independently for each digital
status input. The Bidder sensing voltage shall not exceed 48 Vdc. The sensing
voltage source shall be isolated from that of the RTU logic power such that any
noise or a short circuit across the sensing supply's output terminals would not
disrupt the RTU operation other than the shorted digital status input.

The RTU shall store all status changes detected for retrieval by the master
stations. For communication delays or short-term failure of communications with a
master station, the RTU shall store a minimum of 300 status change events The
RTU shall report any overflow of this status change buffer to the master stations.

Page 11 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

2.7.1. Two-State Devices

All switching devices (breakers) shall be supported by a dual-contact status

indication. Breakers with reclosing capability shall also be supported with
momentary change detection (MCD). All other status indications shall be two-state
single-contact status inputs without MCD.

Single-contact two-state status point inputs will be from a single normally-open

(NO) or normally-closed (NC) contact. Dual-contact two-state status point inputs
will be from two complementary contacts (one NO and one NC). A switching
device status is valid only when one contact is closed and the other contact is
open. Invalid states shall be reported when both contacts are open or both
contacts are closed. The state definition shall be set by Owner for each contact
position.

The RTU shall be set to capture contact operations of 20 ms or more duration.

Operations of less than 20 ms duration shall be considered no change (contact
bounce). The duration used to determine change versus bounce shall be adjust-
able from 4 to 25 ms in increments of 1 ms.

2.7.2. Momentary Change Detection

Two-state status input points with momentary change detection shall be used by
Owner for points where multiple operations (changes of state) can occur between
RTU scans (e.g., breakers with reclosing devices that operate faster than the scan
rate). The RTU shall capture and maintain all of the momentary changes, up to 4
per MCD digital status point. The MCD status input points shall be set to capture
operations of greater than 20 ms duration. Operation of less than 20 ms shall be
considered no change (contact bounce). The capture duration shall be adjustable
between 4 and 25 ms in increments of 1 ms.

2.7.3. Digital Telemetry

Digital telemetry input points shall be provided for sixteen-bit inputs from Owner
telemetry contacts. The digital telemetry may use BCD (4-bit decimal characters
without sign) and/or binary (16 bit) codes.

2.7.4. RTU Sequence of Events (SOE) Collection

The RTU shall collect digital status input data and time-of-operation from fast-
acting power system devices. The RTU shall maintain a clock and shall time-
stamp the data with a time resolution of one millisecond. The time resolution will
enable Owner's operating and engineering personnel to determine the sequential
operation device state changes throughout the power system.

Any digital status input data point in the RTU shall be assignable by Owner as an
SOE point. The SOE buffer shall be sized for at least 1000 events.

Page 12 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

Each time a SOE status indication point changes state, the RTU shall time-tag the
change and store the change (open, close) and the time-tag of the event in SOE
buffers within the RTU. Separate and independent SOE data storage buffers shall
be provided in the RTU for each master station. The RTU shall transfer all Status
points with time tag to master station by exception and within resolution of 1 ms.

When requested from a SCADA system master station, the RTU shall transmit the
SOE data stored in its buffer corresponding to that master station. An
acknowledgement of receipt by the master station shall be made prior to the
deletion of any data in the RTU SOE buffer.

2.8. Digital Control Outputs

The RTU shall provide the capability for a master station to select and change the
state of digital output points. Device control will be used by Owner to control
power system devices including:

(a) Two-state Devices:

Circuit breakers, motor-operated switches, auto/manual switches,
relay disable/enable, and other two-state devices

(b) Variable Output Devices:

Raise/lower control of generators (AGC), transformer load-tap-
changers (LTC), and other variable output devices.

The RTU shall have the capability for control outputs as described in the following
Sub-sections

2.8.1. Two-State Control

A pair of outputs shall be supplied for each two-state (open/close) control output
point that drive control relays. One output shall be supplied for open, the other for
close. Upon command from a master station using the check-before-execute
sequence, the appropriate control output shall be operated for a preset
(momentary) time period. The operation period shall be adjustable for each point
from 0.1 to 2 seconds.

2.8.2. Raise/Lower Pulse Outputs

The RTU shall provide the capability to output Automatic Generation Control
signals to generation equipment upon command from a SCADA system. The
raise/lower output controls will also be used for transformer tap position settings.

A pair of outputs shall be supplied for each (raise/lower) control output point that
drive control relays. One output shall be supplied for raise, the other for lower.
When commanded from the master station, the appropriate raise or lower output
shall be operated for the selected time interval. The closure time interval for
raise/lower pulse output points shall be specified in the operate command from the

Page 13 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

master station. The raise/lower output for each point shall operate over a range of
0.1 to 4 seconds in a minimum of eight equal increments.

2.8.3. Control Output Relays

Control output interposing relays shall be supplied by the Bidder for each control
output described above. Each control relay shall consist of three isolated contacts.
The output contacts shall be rated 10 amps at 220 Vdc, and shall provide arc
suppression to permit interruptions of an inductive load. Relay coils shall be
shunted with diodes to suppress inductive transients associated with energizing
and de-energizing of the relay coils. The relays shall conform to the IEC 255-1-00
and IEC 255-5 requirements.

2.8.4. RTU Control Security and Safety Requirements

The RTU shall include the following security and safety features as a minimum:

(a) Select-check-operate sequence for control output. The verification message

for check-before-operate control sequences shall be obtained by re-encoding the
verification message directly from the control point selection lines. Thus, a simple
reflection of the received message is not acceptable.

(b) No more than one control point shall be selected at any given time. A
detection and lockout method shall be provided that prevents a control operation if
more than one control point has been selected.

(c) The control selection shall be automatically cancelled if after receiving the
"control selection" message, the "operate" command is not received within the set
time period.

(d) No false output shall result during power up or power down. No false output
shall result from inadvertent connections to a circuit card.

(e) All connections with a voltage of fifty (50) volts or more shall have a
protective cover.

(f) All control output connections shall have protective covers.

2.8.5. Control Disable

A manual Local/Remote switch shall be provided for each RTU to disable all
control output interposing relays by breaking the power supply connection to the
control output interposing relays. When in the "Local" position, the Local/Remote
switch shall allow testing of the control outputs without activating the interposing
control relays.

A status input indication shall be provided for the Local/Remote switch to allow the
SCADA system to monitor the position of the switch.

Page 14 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

2.8.6. Dummy breaker relay

The Bidder shall provide a latching relay to be used to simulate and test
supervisory control from the RTU. The simulation relay shall accept the control
signals to open and close from the RTU and shall provide the correct indication
response through a single contact indication input point.

2.9. Analog Outputs

The RTU shall be capable of driving Analog outputs as setpoint control for AGC
(future implementation) or other setpoint devices. The analog outputs shall have
an accuracy of 99.8% of full scale at an ambient temperature of 25 deg. C. Mean
accuracy shall drift no more than 0.01% per deg. C over a temperature range of -5
to +50 deg. C. The Digital-to analog converter shall have a minimum resolution of
2048 counts (sign plus 11 data bits).

The RTU shall accommodate analog outputs which are isolated, unipolar or bipo-
lar, 2-wire ungrounded differential signals with full resolution as follows:

(a) +4 to +20 ma (@ less than 1,500 ohms)

(b) 0 to +10 ma (@ less than 3,000 ohms)

(c) -10 to +10 ma (@ less than 3,000 ohms)

2.10. Time Synchronization

The RTU shall maintain real-time clock and shall have an internal RTU time base
with a stability of 1 ppm i.e. 3.6 milliseconds per hour or better. The RTU shall
maintain the real-time clock information even when the auxiliary power to the RTU
is switched OFF.

The accuracy of the internal clock for shall be maintained by protocol messages
from the master station. The RTU time will be set from time synchronization
messages received from master station at every 10 minutes when using the IEC
60870-5-101 communication protocol over dedicated lines.

The RTU shall be provided with suitable hardware and software for accepting time
synchronisation from a GPS using IRIG –B/ASCII time messages/1 pps signals
also. This shall be preferred means of time synchronisation wherever the RTU can
not be directly synchronised from a master stations (e.g. reporting through Data
concentrator, reporting on TCP/IP connection etc.). Any hardware required for
multiplication of the ports of the GPS shall also be supplied by the Contractor.

2.11. Spare Parts

Page 15 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

The Bidder shall provide spare parts for the RTU supplied. The minimum essen-
tial spare parts to be provided are defined in the Annexure B

2.12. Power Supply

The RTU shall accept power from the DC system with the following character-
istics:

Nominal voltage of 48 Vdc with operation between 41 and 53 Vdc. The

voltage may vary during normal operation between these limits with a
duration not less than 1 ms.

Reversed polarity protection.

Positive DC earth system.

The Bidder shall supply any hardware required to convert RTU input voltage to the
required internal voltages for the RTU hardware. The RTU shall operate with
grounded input power from Owner. The RTU shall not place a ground on the input
power.

Each RTU shall have the capability of automatic start-up and initialisation following
restoration of power after an outage without need of master station intervention.
All restarts shall be reported to the connected master stations.

Secondary power shall be provided to the RTU at 230 Vac, 50 Hz, single-phase
for non-critical auxiliary equipment including heaters, internal lighting, and internal
maintenance outlets.

2.12.1. Power Supply Protection

Over voltage and under voltage protection shall be provided to the input and
output of the power supply in addition to output over current protection to
safeguard the RTU internal logic from being damaged as a result of a component
failure in the power supply and to prevent the RTU internal logic from becoming
unstable and causing mal-operation as a result of voltage fluctuations.

2.12.2. Power Supply Failure Indicators

The RTU shall have a status point which shall be set if the power to the RTU's has
been cycled (off-on) for any reason (including maintenance). The master station
shall reset the power fail status point.

2.13. RTU Panel

The Bidder shall provide simplex type panel for the RTU . The constructional
features of the panel shall be similar to the construction features defined of
Control and Relay Panels specifications.

Page 16 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

2.14. Interconnections

The bidder shall supply, install, terminate at both ends, test and commission all
interconnection cables (power, control and signal cables) as follows:

Between RTU and LDMS/RCC equipment

Between RTU and C&R panels

Between RTU and RTCC panel

Between RTU and Communication equipments at station end

Between communication equipment and SCADA equipment at remote
end

Between RTU, LDMS/RCC and power supply equipment

All power and control cables shall be as per owners technical specifications for the
same. The signals cables for communication, I/O points shall be shielded type to
provide suitable protection against noise and electromagnetic interference. All
the cables shall be suitably sized to meet the functional requirements.

2.15. Panel Internal Wiring

The Panel internal wiring shall be similar to the owner’s technical

specifications of control and relay panels.

2.16. Terminal Blocks

Terminal blocks shall be screw-type/ stud type/ cage clamp type/ self
stripping/spring type having provision for disconnection(isolation), with full-depth
insulating barriers made from moulded self-extinguishing material. Rust-proofing
of metallic components shall be provided by means of the metal used or a suitable
coating. Terminal blocks shall be appropriately sized and rated for the electrical
capacity of the circuit and wire used.

2.17. Assembly and Components Identification

Each assembly (to the level of printed circuit cards) shall be clearly marked with
the manufacturer's part number, serial number, and the revision level of the
component. Changes to assemblies shall be indicated by an unambiguous change
to the marked revision level.

All electronic parts (such as capacitors, resistors, and integrated circuits) shall be
marked either with the characteristics of the part or with an industry standard part
number. Where custom parts are provided (such as read-only memories), the part
shall be marked such as to specifically identify the part when similar parts may
exist.

Page 17 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

All printed circuit card cages and all slots within the cages shall be clearly labelled.
Printed-circuit cards shall be keyed for proper insertion. It is desirable that printed-
circuit cards be keyed to prevent insertion into incorrect locations.

All circuit protection breakers shall be of the manually operated, moulded-case

type, and shall provide thermal over-current and instantaneous short-circuit
protection in each pole. All circuit breakers for 48 Vdc circuits or less shall be
rated at not less than 125 Vdc. 240-Vac circuit breakers shall be rated at not less
than 480-Vac.

2.18. Noise Level

The audible noise generated by the RTU equipment shall not exceed 50 dbA one
meter from the enclosure.

2.19. Environmental Requirements

The RTU will be installed in control buildings without temperature or humidity

control. The RTU shall be capable of operating in ambient temperatures from -5 to
+50 deg C and relative humidity from 5 to 95%, non-condensing with rate of
temperature change of 30 deg C/hour.

2.20. Availability

The RTU will perform data acquisition and control of important equipment
necessary for the operation of Owner's power system. Any failure of an RTU to
perform its functions will adversely affect power system operations. An availability
of 99.9% is required exclusive of communication channel availability. An RTU
shall be considered unavailable when:

(a) Any function is lost for all points of a single type

(b) One entire data scan group fails
(c) More than one input card or output card of the same type fails
(d) One input card or output card of each type fails
(e) Failure of any modem.

2.21. RTU Size and Expandability

The RTU shall be supplied for the sizing as per Annexure A. The RTU delivered
shall have further capability to add additional I/O modules to expand the overall
point count of the RTU by a minimum of fifty percent (50%) of the actual RTU
count as defined in Annexure A. Expansion shall be accomplished in the field by
Owner by only adding additional distributed input/output modules within the main
unit.

2.22. Maintainability

Page 18 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

The RTU design shall facilitate isolation and correction of all failures. The following
features which promote rapid problem isolation and replacement of failed
components shall be provided:

(a) Self-diagnostic capabilities within each RTU which can be initiated at

the RTU site

(b) On-line error detection capabilities within the RTU and detailed
reporting to the connected master stations of detected errors

Page 19 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

3.0 LOCAL DATA MONITORING SYSTEM (LDMS)

The LDMS shall be used for local data acquisition, monitoring and control of
substation parameters through RTU.

The scope of LDMS shall include installation and integration of LDMS software on
a Personal computer. The bidder has the option to use personal computer and
printer being supplied as part of C & R panel specification for disturbance
recorder/event logger for LDMS purpose as well. However if bidder feels that
Disturbance/event logger PC and printer are not adequate to meet LDMS
requirement, then separate PC and/or printer shall be provided for LDMS at no
additional cost to owner.

The LDMS shall be a mini SCADA system providing MMI capability for use in the
sub-station control room building. The LDMS software shall include following
functions:

(i) data acquisition for analog, digital and pulse accumulator type data
(ii) data processing – Conversion to engineering units , limit monitoring,
data validity test, calculated data
(iii) Calculated data (such as maximum, minimum, average values with
associated time-stamping etc.) of all the station parameters.
(iv) Time Synchronization
(v) Sequence of Events Processing
(vi) Supervisory control
(vii) Alarm, tagging, trending, quality codes etc.
(viii) Single Line Diagrams, Trends, daily, weekly, monthly reports etc. shall
be prepared by the bidder and integrated on LDMS system. The
LDMS shall also have capability to generate additional displays,
single line diagrams, reports , and trends.

The LDMS shall store all real-time telemetered & calculated data every 5 minutes
(adjustable to 15,30,45,60 minutes). The software and hardware shall be sized for
storage of all above data at every 5 minutes for at least six months duration. All
alarms, events, SOE etc. shall also be stored on regular basis. It shall be possible
to define daily, weekly, monthly Substation reports on LDMS. It shall be possible to
generate reports highlighting the maximum, minimum, average with associated
time-stamping etc. of all the station parameters. The historical data stored on the
storage medium shall be in standard format and necessary tools for its conversion
to standard spreadsheet programs (Calc, Excel) shall be provided.

The LDMS shall update analog data from RTU every ten seconds (programmable)
and status data by exception. The SOE status data shall be recoded with
resolution of 1 ms timestamp.

Page 20 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

4.0 SOFTWARE REQUIREMENTS

The software provided to support the functions of the RTU/LDMS shall meet the
characteristics described in this Sub-section. The term "software" is used
throughout this Specification to mean either software or software implemented in
firmware.

4.1 Design Characteristics

All software shall be implemented according to the Bidder's established design

and coding standards. Owner reserves the right to reject any software that does
not conform to these standards. Complete and comprehensive documentation
shall be provided for all software.

The software and the database shall be sized to accommodate growth within the
sizing parameters defined for the RTU without requiring software or database
regeneration. The design of the software and the database shall not restrict future
expansion beyond the sizing parameters. Expansion beyond the original design
parameters may require software or database regeneration.

At the time the RTU is accepted, all software delivered must be up to date and in
final form, including all standard software changes and field changes initiated by
the Bidder or the sub-contractor prior to acceptance. The software documentation
must reflect these changes.

4.2 Operating System

The Bidder shall use a non-proprietary operating system capable of managing the
distributed applications of the RTU. If a proprietary operating system is offered
then Bidder shall provide the corresponding source code. The operating system
shall support multi-tasking and multi-programming. The minimum real-time facili-
ties to be provided shall include process, job, database, and memory manage-
ment, process synchronizing, message services for communication between jobs,
and device and interrupt handling. Industry Standard operating system shall be
provided for LDMS.

4.3 Initialization/Restart Program

Software shall provide automatic restart of the RTU upon power restoration,
memory parity errors, hardware failures, and upon manual request. The software
shall initialize the RTU and begin execution of the RTU functions without
intervention by master station. All restarts shall be reported to the connected
master stations.

4.4 RTU Operations Monitoring

Page 21 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

Software shall be provided to continuously monitor operation of the RTU and

report RTU hardware errors to the connected master stations. The software shall
check for memory, processor, and input/output errors and failures.

4.5 RTU Configuration Support

The Bidder shall supply a database compiler which will enable to configure and
document each RTU's database. A compiler shall be provided to completely
generate or modify the database of the RTU. The database compiler shall provide
error detection services and shall produce a printed listing of the input data and
the resulting RTU configuration. It shall be possible to maintain the RTU database
locally and from a master station.

4.6 Diagnostic Software

RTU shall have diagnostic software which monitors and individually test each of
the modules of RTU. The diagnostics shall provide comprehensive user
interaction and printout capabilities.

4.7 Software Deliverables

RTU & LDMS software shall be delivered on electronic media in two

copies with requisite licenses. The List of deliverable software shall be
submitted during detailed engineering.

Page 22 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

5.0 INSPECTION AND TEST

All materials, hardware, and software to be furnished and all work to be performed
under this Specification shall be subject to inspections and tests. No equipment
shall be shipped until all required inspections and tests have been made,
demonstrating that the equipment conforms to the Specification and that the
hardware and software have been approved for shipment by Owner

Approval of inspection and test results, acceptance of hardware and software, or

the waiving of inspection and tests thereof, shall in no way relieve the Bidder of
the responsibility for furnishing equipment which meets the requirements of this
Specification, nor shall such actions invalidate any claim which Owner may make
because of defective or unsatisfactory hardware and software. Owner reserves
the right to request additional tests on the equipment at no extra charge on any
work Owner determines not to be in accordance with this Specification.

Whenever the results of any inspections or tests performed or requested by

Owner in accordance with the requirements of this Sub-section indicate that
specific hardware, software, or documentation does not meet the specification
requirements, the Bidder shall replace, modify, or add, at no cost to Owner, hard-
ware, software, or documentation as necessary to correct the noted deficiencies.

5.1 Inspection

Representatives of Owner shall have free entry into the shops of the manufac-
turer at any time while design, fabrication, or testing of the equipment is taking
place and into any mill, shop, or factory where the hardware or software described
in this specification is being produced.

The Bidder shall provide to Owner's representatives, free of cost, all reasonable
facilities, equipment, and documentation necessary to satisfy Owner's represen-
tatives that the hardware is being fabricated in accordance with the Specification.
The inspection rights described above shall apply to the facilities of the Bidder or
the Bidder's sub-Bidder where the hardware is being manufactured. The inspec-
tion rights shall not apply to the facilities of sub-Bidders supplying unit components
to the manufacturer. Such items will be inspected and tested by Owner's repre-
sentatives at the manufacturing site.

Inspections by Owner will include visual examination of the physical appearance

of the hardware, cable dressings, and equipment and cable labelling. Bidder
documentation will also be examined to verify that it adequately identifies and
describes all hardware, software, and spare parts. Owner shall have access to
inspect the Bidder's and manufacturer's quality assurance standards, procedures,
and records, which are applicable to this project. Inspection shall not relieve the
Bidder of the responsibility for furnishing material and equipment conforming to
the requirements of the Specification, nor shall such inspection invalidate any
claim which Owner may make because of defective or unsatisfactory hardware or
software.

Page 23 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

5.2 Test Procedures

The Bidder shall submit the test procedures for approval twelve weeks prior to the
start of factory tests. Fully approved test procedures shall be submitted to Owner
at least four weeks prior to the commencement of the tests. Owner will approve
test procedures if they are inclusive, thoroughly testing each of the equipment.
The Bidder shall use IEC standards as a guide in preparing the test procedures.
The test procedures shall include the following:

(a) The test schedule, including provision for eight hours of unstructured
tests to be performed by Owner

(b) The purpose of each test

(c) The function to be tested

(d) The plans/procedures to be followed

(e) Specific references to project documentation for correlation with the

procedures and for verification of the documentation

(f) The test setup, equipment, and conditions for each part of the test

(g) All test inputs and outputs

(h) Test software descriptions and listings

(i) A copy of any certified test data to be used in lieu of testing

(j) Expected results

(k) The acceptance criteria

(l) A procedure for handling the variances that are identified during
testing.

5.3 Test Records

The Bidder shall maintain a complete record of the results of all tests. This record
shall be keyed to the steps enumerated in the previously approved test proce-
dures. The record shall include the following items:

(a) Reference to the appropriate Sub-section of the test procedure

(b) Description of any special test conditions or special action taken

(c) Test results, passed/failed.

Page 24 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

A copy of the test records shall be delivered to Owner at the conclusion of the
tests.

5.4 Factory Tests

The RTU, and cabling elements of the RTU procurement shall be tested in
two parts i.e. type test and routine test as described below

(1) Type Testing:

A minimum of one of each major complete integrated units shall be fully tested to
assure full compliance with the functional and technical requirements of the Speci-
fication. The type test reports for the RTU shall be submitted by the bidder which
shall include the tests listed in Table-1 & Table -2 below.

TABLE –1 List of Type Tests on RTU

Test
DESCRIPTION OF THE TEST
Nos.
EMI/EMC IMMUNITY TESTS FOR RTU
1. Surge Immunity Test as per IEC 60870-2-1
2. Electrical Fast Transient Burst Test as per IEC-60870-2-1
3. Damped Oscillatory Wave Test as per IEC 60870-2-1
4. Electrostatic Discharge test as per IEC 60870-2-1
5. Radiated Electromagnetic Field Test as per IEC 60870-2-1
6. Damped Oscillatory magnetic Field Test as per IEC-60870-2-1
7. Power Frequency magnetic Field Test as per IEC-60870-2-1
INSULATION TEST FOR RTU
8. Power frequency voltage withstand Test as per IEC 60870-2-1
9. 1.2/50 µs Impulse voltage withstand Test as per IEC 60870-2-1
10. Insulation resistance test
ENVIRONMENTAL TEST FOR RTU
11. Dry heat test as per IEC60068-2-2
12. Damp heat test as per IEC60068-2-3

Page 25 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

TABLE - 2 Test Level Requirements

Sl Test Name EUT Test Power I/O Passing

No Statu Level Supply Point Criteria
s Points s
CM DM CM
1. Surge Immunity Test ON Level 3 2 kV 1 kV 2 kV A
(1.2/50 µs)
2. Electrical Fast ON Level 3 2 KV - 1 kV A
Transient Burst Test
3. Damped Oscillatory ON Level 3 2.5 kV 1 kV 2.5 kV A
Wave Test
4. Electrostatic ON Level 3 +/- 6 kV in Contact A
Discharge Test discharge mode or +/-
8 kV in Air discharge
mode
5. Radiated Electro- ON Level 3 10 V/m electric field A
magnetic Field Test strength
6. Damped Oscillatory ON Level 3 30 A/m at 1MHz of A
Magnetic Field Test magnetic field strength
7. Power frequency ON Level 3 30 A/m of magnetic A
magnetic field field strength
(Continuous duration
sine wave)
8. Power frequency OFF - 1 KV rms for 1 minute No break
voltage withstand down or
flashover
shall
occur
9. 1.2/50µs impulse OFF - No break
voltage withstand down or
2 kVp flashover
shall
occur
10. Insulation Resistance OFF - Measure Insulation As per
Test resistance using 500 V manufact
DC Megger before & urer
after Power Freq & standard
Impulse voltage
withstand tests
11. Dry heat test ON - Continuous operation 0
at 550 C for 16 hrs
12. Damp heat test ON - at 95% RH and 400 C 0

Note: -
EUT - Equipment Under Test
CM - Common Mode; DM - Differential mode
I/O points do not include communication ports
Passing Criteria
0 - no failure: normal performance within the specified limits
A: minor failure : temporary degradation or loss of function or performance which is
self-recoverable, however issuance of control output command is not allowed.

Page 26 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

( 2) Routine testing :

Each complete RTU shall undergo functional testing to demonstrate compliance

with specified requirements, standards, and functional capabilities including:

(a) Inventory check and inspection for general construction, cabling,

connections, drawing conformance and labelling.

(b) Tests of proper functioning of hardware and software by a thorough

exercising of all RTU functions, both individually and collectively.

(c) Test operation and accuracy of all RTU analogue inputs over entire
range.

(d) Test operation of all RTU digital input points.

(e) Test operation of all RTU control outputs.

(f) Test SOE and RTU time synchronization and accuracy.

(a) Test of RTU power failure and recovery

(h) Tests of communications, including all communications ports, modems

and local interfaces.

For any variations in the configuration, hardware components used or variations

from the Type accepted equipment, Owner has the right to perform any of the
Type Testing before successful completion of the Routine Testing.

5.5 Field Performance Tests

The Bidder shall be responsible for providing field installation and testing. All
hardware will be installed, aligned, and adjusted, interfaces to all field inputs and
outputs established, operation verified and all test readings recorded. Upon
completion, a field performance test shall be performed to exercise all functions of
the RTU and duplicate selected routine tests to the extent possible. The SCADA
database and displays at regional SCADA master station shall be developed by
Owner, however for this purpose all necessary information shall be provided by
the bidder. This testing will include, but not be limited to, the following tests:

RTU initialization.

Proper functioning of hardware and software by exercising of selected

RTU functions using the master station.

Proper RTU communications interface.

Test operation of all diagnostic software and confirm issuance of

meaningful messages for all types of error conditions.

Page 27 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

Test time synchronization and accuracy of the RTU from the master
station.

Development and integration of database at RTU and LDMS end in-line

with regional SCADA master database design will be the responsibility
of the bidder.

RTU database verification including point-to-point operation and scaling

accuracy using the master station.

Integration of RTU with LDMS, printer and regional SCADA master.

The test procedures shall be submitted at least 12 weeks prior to installation of

RTU.

Page 28 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

6.0 TRAINING AND SUPPORT SERVICES

The Bidder shall provide training and support services to create Owner's in-house
maintenance and support capabilities for the hardware and software. The training
program shall be comprehensive and provide for interdisciplinary training
hardware and software. The required training of Owner's personnel shall be
conducted by the Bidder in English.

6.1 RTU and LDMS Training

The Bidder shall provide RTU and LDMS hardware, software, and operation &
maintenance training. The courses shall familiarize Owner's course participants
with RTU installation, card/circuit board level troubleshooting and repair
procedures, and the recommended preventive maintenance procedures for the
RTU equipment. Courses shall include use of the RTU configuration and
maintenance terminal and shall demonstrate all facets of its operation. Courses
shall also include hands-on trouble-shooting experience with the RTU supplied by
the Bidder and shall cover any special equipment required for maintenance.
Actual RTU to be supplied under this procurement shall be used for training.

The Bidder shall also provide RTU software training in the following areas:

(a) RTU configuration, modification, and expansion.

(b) RTU database generation and maintenance.
(c) RTU software and operation, including data flow.

The Bidder shall also provide LDMS software training in the following areas:

(a) LDMS system configuration

(b) Addition/ Edit of database, displays, reports, trends.
(c) LDMS system operation and maintenance.

6.1.1 Attendance

RTU maintenance training shall be provided to two participants.

6.1.2 Training Schedule

The training schedule shall coincide with the delivery of the RTU to Owner. The
training course shall be a optimum mix of class-room and laboratory training, the
duration of training shall be 5 days.

6.1.3 Training Location and Classrooms

The RTU maintenance courses shall be given at the site/ Bidder's facility in India,
or optionally, at Owner's facility. Adequate training manuals shall be provided to
the trainees.

Page 29 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

7.0 DOCUMENTATION

The Bidder shall submit hardware and software documentation for RTUs and
LDMS to Owner for review and approval. After approval four set of all the
documents shall be submitted as final documentation. Any changes observed
during field implementation shall be incorporated in the as-build drawing and four
sets of same shall be submitted to owner. In addition to paper copies all the
documents shall also be provided on electronic media in two copies.

7. 1 Hardware Documentation

The Bidder shall provide documentation for all hardware supplied to Owner.
Documentation describing the circuitry, operation of the circuitry, and
troubleshooting and maintenance procedures shall indicate the revision level of
the hardware to which the documentation applies. Generic manuals are not
acceptable unless they clearly show what is supplied and what is not supplied.
This documentation shall satisfy the following requirements:

An inventory of the hardware

General arrangement drawing of the RTU panel

General Arrangement drawing of RTU rack indicating card
location etc.

RTU Installation drawing / manual.

Schematic drawing for all I/O point terminations and
communication ports.

Cabling and wiring diagrams.

RTU Hardware, maintenance and operation manuals.

LDMS hardware, maintenance and operation manuals.

7.2 Software Documentation

The Bidder shall supply documentation for all software provided with the RTU and
LDMS. This documentation shall include the following documentation as a
minimum:

Software Inventory.

Functional Design specification of RTU software and LDMS software.

Software maintenance manuals for RTU configuration and maintenance
software, LDMS software, RTU softwares.

RTU and LDMS database documents.

Implemented Protocol detailed document.

Page 30 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

Annexure A

Point Counts for the Remote Terminal Unit (RTU)

S. Type of Qty.* Requirement for RLDC Additional Requirement for

no. Telemet LDMS
ry point
1. Analog Nos. (a) P, Q for each feeder, (e) Current I of each phase
Input transformer, reactor. for each feeder,
(b) Bus V, F for each bus. transformer
(c) OLTC position for each (f) Line Voltage of each
transformer. phase for each feeder
(d) 32 Analog points for future (g) OTI , WTI for each
use Transformer.
(h) Auxiliary system -15
points
2. Digital (a) Dual status contacts: (e) Single Status
Input Nos. (1 NO & 1 NC) for each contacts for alarms
breaker. /Trip/ Supervision
(b) Single status contacts: events:-
Protection contact 1
per feeder/transformer/ 400 nos for Substations
reactor/BUS. having voltage levels of
(c) Single status contacts: 220kV & above .
1 per Isolator.
(d) 64 Single Status Points 200 nos for Substations
for Future Use having voltage levels of
132kV and below.
3 Digital TRIP/CLOSE of 8 circuit
Control Nos. breakers.
output
(with
interpos
ing
relays)

Note:

1. Cabling with control and relay panels shall be carried out for current bays as per
single line diagram of the substation, however all analog and digital points shall
be wired to terminal blocks in the RTU for external interface.

2. All contacts shall be defined as SOE.

3. Quantity Nos will be as per Single Line Diagram.

Page 31 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

Annexure B

SPARES FOR REMOTE TERMINAL UNIT CARD/MODULE

Sl.no. Card/Module Type Quantity (nos.)

1 Power supply card 1
2 CPU card 1
3 Modem (standalone type) As 1
Applicable
4 Communication Card 1
5 Analog Input Card 1
6 Digital Input Card 1
7 Digital Output Card 1
8 Other cards (as per suppliers 1 each
design)
9 Master PROM/EPROMs etc. 1 each.
as applicable

Page 32 of 33 Rev.3
 Model Technical Specification For RTU and LDMS

Annexure C

Inter Operatibility Profile of Regional Control Centre

(The interopeartibility Profile of Concerned region is attached herewith)

Page 33 of 33 Rev.3
 TECHNICAL SPECIFICATION
SECTION-GENERAL TECHNICAL REQUIREMENTS

पावर �ग्रड काप�रे शन आफ इिन्डया �ल�मटे ड

(भारत सरकार का उद्यम)
Power Grid Corporation of India Limited
(A Government of India Enterprises)

Document No.: C/ENGG/SPEC/GTR (Rev.14) Jan’ 2017

MODEL TECHNICAL SPECIFICATION
SECTION‐GTR
(GENERAL TECHNICAL REQUIREMENT)
[Rev. No. 14]
 SECTION- GENERAL TECHNICAL REQUIRMENT (GTR)

Followings are the major changes made in the Technical Specification, Section-GTR (Rev.- 14)

Clause No. Major Modifications

4.6 - Creepage of insulator strings has been linked with Section-Switchyard Erection
- Section Clearance for 33kV & 11kV system has been revised as 2800mm
- Duration of Rated short circuit current for 66kV, 33kV & 11kV system has been
revised as 3 secs in place 1 sec
4.6.1 Major Technical Parameters for switchyard equipments have been deleted from
section-GTR and to be referred in technical specification of respective
equipment
5.1 Comprehensive list of drawings/documents which are to be submitted to the
Employer is enclosed in Annexure-E
8.0 Quality assurance programme has been modified
8.2 Quality assurance documents has been modified
8.3 Inspection, Testing & Inspection certificate has been modified
9.2 - Type Test witnessed by reputed consultant has been deleted
- Type Test Report Validity has been modified to 10 years for CT & CVT
- Following is deleted
“Further, in case type tests are required to be conducted/repeated and the
deputation of Inspector/Employer's representative is required, then all the
expenses shall be borne by the contractor. The Employer shall bear the
expenses for deputation of Employer’s representative(s) for witnessing the type
tests”.
9.5 New clause added – “The list of makes of various items, for which Type test
reports are not required to be submitted are specified in Compendium of
Vendors (COV)’ has been added.
12.2.1 Minimum weight of the zinc coating is 900 gm/sq.m for coastal area (30km
from sea shore approximately) is specified.
12.3.7 No painting is envisaged for the surface of stainless steel
13.3 Specification for open storage platform alongwith drawing has been included.
14.1 All T&P shall be taken back by the contractor after commissioning of the system
14.2 The scope of special tools and tackles are to be decided during detail engineering
and the list of special tools and tackles, if any shall be finalized and the same
shall be supplied without any additional cost implication to the Employer.
17.8 Current carrying parts (500A and above) of the clamp/connector shall be
provided with minimum four numbers of bolts preferably for 132kV &
above.
18.2 Control cabinets, junction boxes, Marshalling boxes & terminal boxes shall be
made of stainless steel of atleast 1.5 mm thick or aluminum enclosure of
atleast 1.6 mm thick and shall be dust, water and vermin proof. Stainless
steel used shall be of grade SS304 (SS316 for coastal area) or better.
19.0 New Clause for ‘DISPOSAL OF PACKING MATERIAL & WASTE FROM
CONSTRUCTION SITE ‘ has been added
22.9 RTV Coating on porcelain insulators (for coastal area) has been included.
24.0 Clause 24.0 (TECHNICAL REQUIREMENT OF EQUIPMENTS) has been revised as
per technical approval vide ref. no. C/ENGG/GTR/REV dated 08.8.2016 (except
for GIS):
- Circuit Breaker, Isolator, Current Transformer, Capacitive Voltage
transformer, Inductive Voltage transformer, Surge Arrester and Wave Trap
- 765kV class Transformer
- 765kV class Reactor
 Clause No. Major Modifications
- 400kV, 220kV, 132kV and 110kV class Transformer
- 400kV, 220kV and 132kV class Reactor
- 400 kV Grade XLPE Power Cables
- 220KV Grade XLPE Power Cables
- 132KV, 110kV, 66kV Grade XLPE Power Cables
- 1.1 KV Grade PVC Control Cable
- 1.1 KV Grade PVC Power Cable
- Battery
- Battery Charger
- LT Transformer
- Composite Long Rod Polymer Insulator (765kV & 400kV)
- Control, Relay & Protection System and Sub-station Automation System
- Analog and digital PLCC panels (765kV, 400kV, 220kV & 132kV)
- “Indian Associate” for execution of on shore supply and services for 765 kV
Transformer & Reactor package
Annexure-D List of drawings for second advance has been revised

NOTES:-
1. The above is the list of major changes w.r.t. the previous revision (Rev.-13). However, Bidders
are advised to read the entire section-GTR for other changes and quote accordingly.
 SECTION- GENERAL TECHNICAL REQUIRMENT (GTR)

INDEX

CLAUSE NO. ITEM PAGE NO.

1.0 Foreword 1
2.0 General Requirement 1
3.0 Standards 1
4.0 Services to be performed by the Equipment being furnished 2
5.0 Engineering Data and Drawings 5
6.0 Material/Workmanship 7
7.0 Design Improvements/Coordination 9
8.0 Quality Assurance Programme 9
9.0 Type Testing, Inspection & Inspection Certificate 15
10.0 Tests 16
11.0 Packaging & Protection 17
12.0 Finishing of Metal Surfaces 17
13.0 Handling, Storing & Installation 19
14.0 Tools 20
15.0 Auxiliary Supply 21
16.0 Support Structure 21
17.0 Clamps and Connectors including Terminal Connectors 22
18.0 Control Cabinets, Junction Boxes, Terminal Boxes & 23
Marshalling Boxes for Outdoor Equipment
19.0 Disposal of packing material & waste from construction site 24
20.0 Terminal Blocks and Wiring 24
21.0 Lamps and Sockets 25
22.0 Bushings, Hollow Column Insulators, Support Insulators 26
23.0 Motors 26
24.0 Technical Requirement of Equipments 28
Annexure-A Corona and Radio Interference Voltage (RIV) Test 2 sheets
Annexure-B Seismic Withstand Test Procedure 1 sheet
Annexure-C List of General Standards and Codes 23 sheets
Annexure-D List of Drawings/Documents for second advance 2 sheets
Annexure-E Comprehensive List of drawings 9 sheets
Annexure-F Assessment report from Main Contractor for proposed sub- 1 sheet
vendor’s – List of enclosures
Annexure-G MQP & Inspection Level Requirement 3 sheets
Annexure-H Specification of RTV coating on porcelain insulators 2 sheets
Annexure-I Standard Drawing for open platform 1 sheet
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

1.0 FOREWORD
The provisions under this section are intended to supplement requirements for the
materials, equipments and services covered under other sections of tender documents
and are not exclusive.
2.0 GENERAL REQUIREMENT
2.1 The contractor shall furnish catalogues, engineering data, technical information, design
documents, drawings etc., fully in conformity with the technical specification during
detailed engineering.
2.2 It is recognised that the Contractor may have standardised on the use of certain
components, materials, processes or procedures different from those specified herein.
Alternate proposals offering similar equipment based on the manufacturer’s standard
practice will also be considered provided such proposals meet the specified designs,
standard and performance requirements and are acceptable to Employer.
2.3 Wherever a material or article is specified or defined by the name of a particular brand,
Manufacturer or Vendor, the specific name mentioned shall be understood as
establishing type, function and quality and not as limiting competition.
2.4 Equipment furnished shall be complete in every respect with all mountings, fittings,
fixtures and standard accessories normally provided with such equipment and/or
needed for erection, completion and safe operation of the equipment as required by
applicable codes though they may not have been specifically detailed in the Technical
Specifications unless included in the list of exclusions. Materials and components
which are minor in nature and incidental to the requirement but not specifically stated
in the specification and bid price schedule, which are necessary for commissioning and
satisfactory operation of the switchyard/ substation unless specifically excluded shall
be deemed to be included in the scope of the specification and shall be supplied
without any extra cost. All similar standard components/parts of similar standard
equipment provided, shall be inter-changeable with one another.
2.5 The Contractor shall also be responsible for the overall co-ordination with internal
/external agencies; Supplier of Employer’s supplied equipments, project management,
training of Employer’s manpower, loading, unloading, handling, insurance, moving to
final destination for successful erection, testing and commissioning of the substation
/switchyard.
2.6 The bidder shall be responsible for safety of human and equipment during the working.
It will be the responsibility of the Contractor to co-ordinate and obtain Electrical
Inspector's clearance before commissioning. Any additional items, modification due to
observation of such statutory authorities shall be provided by the Contractor at no
extra cost to the Employer.
3.0 STANDARDS
3.1 The works covered by the specification shall be designed, engineered, manufactured,
built, tested and commissioned in accordance with the Acts, Rules, Laws and
Regulations of India.
3.2 The equipment to be furnished under this specification shall conform to latest issue
with all amendments (as on the originally scheduled date of bid opening) of standard
specified under Annexure-C of this section, unless specifically mentioned in the
specification.
3.3 The Bidder shall note that standards mentioned in the specification are not mutually
exclusive or complete in themselves, but intended to compliment each other.

____________________________________________________________________________
Technical Specification: GTR Page 1 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

3.4 The Contractor shall also note that list of standards presented in this specification is
not complete. Whenever necessary the list of standards shall be considered in
conjunction with specific IS/IEC.
3.5 When the specific requirements stipulated in the specifications exceed or differ than
those required by the applicable standards, the stipulation of the specification shall
take precedence.
3.6 Other internationally accepted standards which ensure equivalent or better
performance than that specified in the standards specified under Annexure-C/
individual sections for various equipments shall also, be accepted, however the salient
points of difference shall be clearly brought out during detailed engineering along with
English language version of such standard. The equipment conforming to standards
other than specified under Annexure-C/individual sections for various equipments
shall be subject to Employer’s approval.

4.0 SERVICES TO BE PERFORMED BY THE EQUIPMENT BEING FURNISHED

4.1 The 800kV and 420kV system is being designed to limit the switching surge over
voltage of 1.9 p.u. and 2.5 p.u., respectively and the power frequency over voltage of 1.4
p.u. and 1.5 p.u., respectively. In case of the 420kV system, the initial value of the
temporary overvoltages could be 2.0 p.u. for 1-2 cycles. The equipment furnished
under this specification shall perform all its functions and operate satisfactorily
without showing undue strain, restrike etc under such over voltage conditions.
4.2 All equipments shall also perform satisfactorily under various other electrical,
electromechanical and meteorological conditions of the site of installation.
4.3 All equipment shall be able to withstand all external and internal mechanical, thermal
and electromechanical forces due to various factors like wind load, temperature
variation, ice & snow, (wherever applicable) short circuit etc for the equipment.
4.4 The bidder shall design terminal connectors of the equipment taking into account
various forces that are required to withstand.
4.5 The equipment shall also comply to the following:
a) To facilitate erection of equipment, all items to be assembled at site shall be
“match marked”.
b) All piping, if any between equipment control cabinet/operating mechanism to
marshalling box of the equipment, shall bear proper identification to facilitate
the connection at site.
4.6 System Parameter

765kV, 400kV & 220kV System

SL Description of 765kV 400kV 220kV

No parameters System System System

1. System operating voltage 765kV 400kV 220kV

2. Maximum operating 800kV 420kV 245kV
voltage of the system
(rms)
3. Rated frequency 50HZ 50Hz 50Hz
4. No. of phase 3 3 3
5. Rated Insulation levels

____________________________________________________________________________
Technical Specification: GTR Page 2 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

SL Description of 765kV 400kV 220kV

No parameters System System System

i) Full wave impulse 2100kVp 1550kVp 1050

withstand voltage kVp
(1.2/50 microsec.)
ii) Switching impulse 1550kVp 1050kVp -
withstand voltage
(250/2500 micro sec.)
dry and wet
iii) One minute power 830kV 630kV -
frequency dry withstand
voltage (rms)
iv) One minute power - - 460kV
frequency dry and wet
withstand voltage (rms)
6. Corona extinction 508 kV 320kV -
voltage
7. Max. radio interference 2500 µV 1000 µV 1000 µV
voltage for frequency at 508 kV rms at 266kV rms at 156kV rms
between 0.5 MHz and 2
MHz
8. Minimum creepage 20000 mm 10500 mm 6125 mm
distance - for Equipment (24800 mm for (13020 mm (7595 mm for
other than Insulator coastal area) for coastal coastal area)
string area)
Minimum creepage As specified in Section-Switchyard Erection
distance - for Insulator
String
9. Min. clearances
i. Phase to phase 7600mm 4000mm 2100 mm
(for conductor- (for conductor-
conductor conductor
configuration) configuration)
9400mm (for 4200mm (for
rod-conductor rod -conductor
configuration) configuration)
ii. Phase to earth 4900mm 3500 mm 2100 mm
(for conductor-
structure)
6400mm (for
rod- structure)
iii) Sectional clearances 10300 mm 6500 mm 5000 mm
10. Rated short circuit 40kA/50kA (as 40kA/50kA/ 40kA/
current for 1 sec. applicable) 63 kA 50kA(as
duration (as applicable)
applicable)
11. System neutral earthing Effectively Effectively Effectively
earthed earthed earthed

____________________________________________________________________________
Technical Specification: GTR Page 3 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

132kV, 66kV, 33kV & 11kV System

SL Description of 132 kV 66kV 33 kV 11kV
No parameters System System System System

1. System operating voltage 132kV 66kV 33kV 11kV

2. Maximum operating 145kV 72.5kV 36kV 12kV
voltage of the
system(rms)
3. Rated frequency 50Hz 50Hz 50Hz 50Hz
4. No. of phase 3 3 3 3
5. Rated Insulation levels
i) Full wave impulse 650 325 170 75
withstand voltage kVp kVp kVp kVp
(1.2/50 microsec.)
ii) One minute power 275kV 140kV 70kV 28kV
frequency dry and wet
withstand voltage (rms)
6. Max. radio interference 500 µV at - - -
voltage for frequency 92kV rms
between 0.5 MHz and 2
MHz
7. Minimum creepage 3625 mm 1813 mm 900 mm 300 mm
distance (4495mm (2248mm (1116mm (372mm
for for for coastal for
coastal coastal area) coastal
area) area) area)

8. Min. clearances
i. Phase to phase 1300 mm 750 mm 320 mm 280 mm

ii. Phase to earth 1300 mm 630 mm 320 mm 140 mm

iii. Sectional clearances 4000 mm 3000 mm 2800 mm 2800 mm

9. Rated short circuit 40kA/ 31.5 kA 25 kA 25 kA

current 31.5 kA for 3 sec for 3 sec for 3 sec
(as
applicable)
for 1 sec
10. System neutral earthing Effectively Effectively Effectively Effectively
earthed earthed earthed earthed

Notes:
1. The above parameters are applicable for installations up to an altitude of 1000m above
mean sea level. For altitude exceeding 1000m, necessary altitude correction factor shall
be applicable as per relevant IEC.
2. The insulation and RIV levels of the equipments shall be as per values given in the
Technical Specification of respective equipment.
3. Corona and radio interference voltage test and seismic withstand test procedures for
equipments shall be in line with the procedure given at Annexure-A and Annexure-B
respectively.

____________________________________________________________________________
Technical Specification: GTR Page 4 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

5.0 ENGINEERING DATA AND DRAWINGS

5.1 The list of drawings/documents which are to be submitted to the Employer is enclosed
in Annexure-E. In case any additional drawings/documents are required, the same
shall also be submitted during execution of the contract.
5.2 The Contractor shall submit 4 (four) sets of drawings/ design documents /data /
detailed bill of quantity and 1 (one) set of test reports for the approval of the Employer.
The contractor shall also submit the softcopy of the above documents in addition to
hardcopy.
5.3 Drawings
5.3.1 All drawings submitted by the Contractor shall be in sufficient detail to indicate the
type, size, arrangement, material description, Bill of Materials, weight of each
component, break-up for packing and shipment, dimensions, internal & the external
connections, fixing arrangement required and any other information specifically
requested in the specifications.
5.3.2 Drawings submitted by the Contractor shall be clearly marked with the name of the
Employer, the unit designation, the specifications title, the specification number and
the name of the Project. POWERGRID has standardized a large number of
drawings/documents of various make including type test reports which can be used
for all projects having similar requirements and in such cases no project specific
approval (except for list of applicable drawings alongwith type test reports) is
required. However, distribution copies of standard drawings/documents shall be
submitted as per provision of the contract. All titles, noting, markings and writings on
the drawing shall be in English. All the dimensions should be in SI units.
5.3.3 The review of these data by the Employer will cover only general conformance of the
data to the specifications and documents, interfaces with the equipment provided
under the specifications, external connections and of the dimensions which might
affect substation layout. This review by the Employer may not indicate a thorough
review of all dimensions, quantities and details of the equipment, materials, any
devices or items indicated or the accuracy of the information submitted. This review
and/or approval by the Employer shall not be considered by the Contractor, as limiting
any of his responsibilities and liabilities for mistakes and deviations from the
requirements, specified under these specifications and documents.
5.5 All manufacturing and fabrication work in connection with the equipment prior to the
approval of the drawings shall be at the Contractor’s risk. The Contractor may make
any changes in the design which are necessary to make the equipment conform to the
provisions and intent of the Contract and such changes will again be subject to
approval by the Employer. Approval of Contractor’s drawing or work by the Employer
shall not relieve the contractor of any of his responsibilities and liabilities under the
Contract.
5.6 All engineering data submitted by the Contractor after final process including review
and approval by the Employer shall form part of the Contract Document and the entire
works performed under these specifications shall be performed in strict conformity,
unless otherwise expressly requested by the Employer in Writing.
5.7 Approval Procedure
The following schedule shall be followed generally for approval and for providing final
documentation.
i) Approval/comments/ As per L2 schedule
by Employer on initial
submission
____________________________________________________________________________
Technical Specification: GTR Page 5 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

ii) Resubmission Within 3 (three) weeks

(whenever from date of comments
required)
iii) Approval or comments Within 3 (three) weeks of
receipt of resubmission.
iv) Furnishing of distribution 2 weeks from the date
copies (2 hard copies to each of approval
substation and one scanned
copy (pdf format)
v) Furnishing of distribution
copies of test reports
(a) Type test reports 2 weeks from the date
(one scanned softcopy in of final approval
pdf format to each substation
plus one for corporate centre
& one hardcopy per substation)
(b) Routine Test Reports -do-
(one copy for each
substation)
vi) Furnishing of instruction/ On completion of Engineering
operation manuals (2 copies
per substation and one softcopy
(pdf format) for corporate centre
& per substation)
(vii) As built drawings (two sets of On completion of entire works
hardcopy per substation & one
softcopy (pdf format) for
corporate centre & per substation)
NOTE :
(1) The contractor may please note that all resubmissions must incorporate all
comments given in the earlier submission by the Employer or adequate
justification for not incorporating the same must be submitted failing which the
submission of documents is likely to be returned.
(2) All drawings should be submitted in softcopy form, however substation design
drawings like SLD, GA, all layouts etc. shall also be submitted in AutoCAD
Version. SLD, GA & layout drawings shall be submitted for the entire substation
in case of substation extension also.
(3) The instruction Manuals shall contain full details of drawings of all equipment
being supplied under this contract, their exploded diagrams with complete
instructions for storage, handling, erection, commissioning, testing, operation,
trouble shooting, servicing and overhauling procedures.
(4) If after the commissioning and initial operation of the substation, the instruction
manuals require any modifications/additions/changes, the same shall be
incorporated and the updated final instruction manuals shall be submitted by the
Contractor to the Employer.
(5) The Contractor shall furnish to the Employer catalogues of spare parts.
(6) All As-built drawings/documents shall be certified by site indicating the changes
before final submission.
____________________________________________________________________________
Technical Specification: GTR Page 6 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

5.8 The list of major drawings/documents to be approved to qualify for second advance as
per Section SCC, shall be as per Annexure–D.
6.0 MATERIAL/ WORKMANSHIP
6.1 General Requirement
6.1.1 Where the specification does not contain references to workmanship, equipment,
materials and components of the covered equipment, it is essential that the same must
be new, of highest grade of the best quality of their kind, conforming to best
engineering practice and suitable for the purpose for which they are intended.
6.1.2 In case where the equipment, materials or components are indicated in the
specification as “similar” to any special standard, the Employer shall decide upon the
question of similarity. When required by the specification or when required by the
Employer the Contractor shall submit, for approval, all the information concerning the
materials or components to be used in manufacture. Machinery, equipment, materials
and components supplied, installed or used without such approval shall run the risk of
subsequent rejection, it is to be understood that the cost as well as the time delay
associated with the rejection shall be borne by the Contractor.
6.1.3 The design of the Works shall be such that installation, future expansions,
replacements and general maintenance may be undertaken with a minimum of time
and expenses. Each component shall be designed to be consistent with its duty and
suitable factors of safety, subject to mutual agreements. All joints and fastenings shall
be devised, constructed and documented so that the component parts shall be
accurately positioned and restrained to fulfill their required function. In general, screw
threads shall be standard metric threads. The use of other thread forms will only be
permitted when prior approval has been obtained from the Employer.
6.1.4 Whenever possible, all similar part of the Works shall be made to gauge and shall also
be made interchangeable with similar parts. All spare parts shall also be
interchangeable and shall be made of the same materials and workmanship as the
corresponding parts of the Equipment supplied under the Specification. Where
feasible, common component units shall be employed in different pieces of equipment
in order to minimize spare parts stocking requirements. All equipment of the same
type and rating shall be physically and electrically interchangeable.
6.1.5 All materials and equipment shall be installed in strict accordance with the
manufacturer’s recommendation(s). Only first-class work in accordance with the best
modern practices will be accepted. Installation shall be considered as being the
erection of equipment at its permanent location. This, unless otherwise specified, shall
include unpacking, cleaning and lifting into position, grouting, levelling, aligning,
coupling of or bolting down to previously installed equipment bases/foundations,
performing the alignment check and final adjustment prior to initial operation, testing
and commissioning in accordance with the manufacturer’s tolerances, instructions and
the Specification. All factory assembled rotating machinery shall be checked for
alignment and adjustments made as necessary to re-establish the manufacturer’s limits
suitable guards shall be provided for the protection of personnel on all exposed
rotating and / or moving machine parts and shall be designed for easy installation and
removal for maintenance purposes. The spare equipment(s) shall be installed at
designated locations and tested for healthiness.
6.1.6 The Contractor shall apply oil and grease of the proper specification to suit the
machinery, as is necessary for the installation of the equipment. Lubricants used for
installation purposes shall be drained out and the system flushed through where
necessary for applying the lubricant required for operation. The Contractor shall apply
all operational lubricants to the equipment installed by him.

____________________________________________________________________________
Technical Specification: GTR Page 7 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

6.1.7 All oil, grease and other consumables used in the Works/Equipment shall be purchased
in India unless the Contractor has any special requirement for the specific application
of a type of oil or grease not available in India. If such is the case, he shall declare in the
proposal, where such oil or grease is available. He shall help Employer in establishing
equivalent Indian make and Indian Contractor. The same shall be applicable to other
consumables too.
6.2 Provisions For Exposure to Hot and Humid climate
Outdoor equipment supplied under the specification shall be suitable for service and
storage under tropical conditions of high temperature, high humidity, heavy rainfall
and environment favourable to the growth of fungi and mildew. The indoor
equipments located in non-air conditioned areas shall also be of same type.
6.2.1 Space Heaters
6.2.1.1 The heaters shall be suitable for continuous operation at 240V as supply voltage. On-
off switch and fuse shall be provided.
6.2.1.2 One or more adequately rated thermostatically connected heaters shall be supplied to
prevent condensation in any compartment. The heaters shall be installed in the
compartment and electrical connections shall be made sufficiently away from below
the heaters to minimize deterioration of supply wire insulation. The heaters shall be
suitable to maintain the compartment temperature to prevent condensation.
6.2.2 FUNGI STATIC VARNISH
Besides the space heaters, special moisture and fungus resistant varnish shall be
applied on parts which may be subjected or predisposed to the formation of fungi due
to the presence or deposit of nutrient substances. The varnish shall not be applied to
any surface of part where the treatment will interfere with the operation or
performance of the equipment. Such surfaces or parts shall be protected against the
application of the varnish.
6.2.3 Ventilation opening
Wherever ventilation is provided, the compartments shall have ventilation openings
with fine wire mesh of brass to prevent the entry of insects and to reduce to a
minimum the entry of dirt and dust.
6.2.4 Degree of Protection
The enclosures of the Control Cabinets, Junction boxes and Marshalling Boxes, panels
etc. to be installed shall comply with following degree of protection as detailed here
under:
a) Installed out door: IP- 55
b) Installed indoor in air conditioned area: IP-31
c) Installed in covered area: IP-52
d) Installed indoor in non-air conditioned area where possibility of entry of water is
limited: IP-41.
e) For LT Switchgear (AC & DC distribution Boards): IP-52

The degree of protection shall be in accordance with IS:13947 (Part-I)/IEC-60947

(Part-I)/IS 12063/IEC-60529. Type test report for IP-55 or higher degree of protection
test, shall be submitted for approval.
6.3 RATING PLATES, NAME PLATES AND LABELS
6.3.1 Each main and auxiliary item of substation is to have permanently attached to it in a
conspicuous position a rating plate of non-corrosive material upon which is to be
engraved manufacturer’s name, year of manufacture, equipment name, type or serial
____________________________________________________________________________
Technical Specification: GTR Page 8 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

number together with details of the loading conditions under which the item of
substation in question has been designed to operate, and such diagram plates as may
be required by the Employer. The rating plate of each equipment shall be according to
IEC requirement.
6.3.2 All such nameplates, instruction plates, rating plates of transformers, reactors, CB, CT,
CVT, SA, Isolators, C & R panels and PLCC equipments shall be bilingual with Hindi
inscription first followed by English. Alternatively two separate plates one with Hindi
and the other with English inscriptions may be provided.
6.4 FIRST FILL OF CONSUMABLES, OIL AND LUBRICANTS
All the first fill of consumables such as oils, lubricants, filling compounds, touch up
paints, soldering/brazing material for all copper piping of circuit breakers and
essential chemicals etc. which will be required to put the equipment covered under the
scope of the specifications, into operation, shall be furnished by the Contractor unless
specifically excluded under the exclusions in these specifications and documents.
7.0 DESIGN IMPROVEMENTS / COORDINATION
7.1 The bidder shall offer the equipment meeting the requirement of the technical
specification. However, the Employer or the Contractor may propose changes in the
specification of the equipment or quality thereof and if the contractor & Employer
agree upon any such changes, the specification shall be modified accordingly.
7.2 If any such agreed upon change is such that it affects the price and schedule of
completion, the parties shall agree in writing as to the extent of any change in the price
and/or schedule of completion before the Contractor proceeds with the change.
Following such agreement, the provision thereof, shall be deemed to have been
amended accordingly.
7.3 The Contractor shall be responsible for the selection and design of appropriate
equipments to provide the best co-ordinated performance of the entire system. The
basic design requirements are detailed out in this Specification. The design of various
components, sub-assemblies and assemblies shall be so done that it facilitates easy
field assembly and maintenance.
7.4 The Contractor has to coordinate designs and terminations with the agencies (if any)
who are Consultants/Contractor for the Employer. The names of agencies shall be
intimated to the successful bidders.
7.5 The Contractor will be called upon to attend design co-ordination meetings with the
Engineer, other Contractor’s and the Consultants of the Employer (if any) during the
period of Contract. The Contractor shall attend such meetings at his own cost at
POWERGRID Corporate Centre, Gurgaon (Haryana) or at mutually agreed venue as and
when required and fully cooperate with such persons and agencies involved during
those discussions.
8.0 QUALITY ASSURANCE PROGRAMME
8.1 To ensure that the equipment and services under the scope of this Contract, whether
manufactured or performed within the Contractor’s Works or at his Sub-Contractor’s
premises or at the Employer’s site or at any other place of Work as applicable, are in
accordance with the specifications, the Contractor shall ensure suitable quality
assurance programme to control such activities at all points necessary. A quality
assurance programme of the Contractor shall be in line with ISO requirements & shall
generally cover the following:
a) The organisation structure for the management and implementation of the
proposed quality assurance programme.

____________________________________________________________________________
Technical Specification: GTR Page 9 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

b) System for Document and Data Control.

c) Qualification and Experience data of Bidder’s key personnel.
d) The procedure for purchases of materials, parts, components and selection of sub-
Contractor’s services including vendor analysis, source inspection, incoming raw
material inspection, verification of material purchases etc.
e) System for shop manufacturing and site erection controls including process
controls, fabrication and assembly control.
f) System for Control of non-conforming products including deviation
dispositioning, if any and system for corrective and preventive actions based on
the feedback received from the Customers and also internally documented system
for Customer complaints.
g) Inspection and test procedure both for manufacture and field activities.
h) System for Control of calibration of testing and measuring equipment and the
indication of calibration status on the instruments.
i) System for indication and appraisal of inspection status.
j) System of Internal Quality Audits, Management review and initiation of corrective
and Preventive actions based on the above.
k) System for authorising release of manufactured product to the Employer.
l) System for maintenance of records.
m) System for handling, storage and delivery.
n) A quality plan detailing out the specific quality control measures and procedure
adopted for controlling the quality characteristics relevant to each item of
equipment furnished and /or service rendered.
o) System for various field activities i.e. unloading, receipt at site, proper storage,
erection, testing and commissioning of various equipment and maintenance of
records. In this regard, the Employer has already prepared Standard Field Quality
Plan for transmission line/substation equipments as applicable, Civil/erection
Works which is required to be followed for associated works.
The Employer or his duly authorised representative reserves the right to carry out
quality audit and quality surveillance of the system and procedure of the
Contractor/his vendor’s quality management and control activities.

8.2 Quality Assurance Documents

The Contractor shall ensure availability of the following Quality Assurance Documents:
i) All Non-Destructive Examination procedures, stress relief and weld repair
procedure actually used during fabrication, and reports including radiography
interpretation reports.
ii) Welder and welding operator qualification certificates.
iii) Welder’s identification list, welding operator’s qualification procedure and
welding identification symbols.
iv) Raw Material test reports on components as specified by the specification and in
the quality plan.

____________________________________________________________________________
Technical Specification: GTR Page 10 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

v) The Manufacturing Quality Plan(MQP) indicating Customer Inspection Points

(CIPs) at various stages of manufacturing and methods used to verify that the
inspection and testing points in the quality plan were performed satisfactorily.
vi) Factory test results for testing required as per applicable quality plan/technical
specifications/GTP/Drawings etc.
vii) Stress relief time temperature charts/oil impregnation time temperature charts,
wherever applicable.

8.3 INSPECTION, TESTING & INSPECTION CERTIFICATE

8.3.1 Contractor shall procure bought out items from sub-vendors as per the list in
“Compendium of Vendors” available on POWERGRID web-site
www.powergridindia.com after ensuring compliance to the requirements/conditions
mentioned therein. Contractor shall explore first the possibilities of procuring the
bought out items from POWERGRID approved existing vendors. In case of their
unavailability / non-response, Contractor may approach POWERGRID for additional
sub-vendor approval. In that case, the assessment report of proposed sub vendor by
Contractor along with the enclosures as per Annexure-F shall be submitted within 60
days of the award. The proposal shall be reviewed and approval will be accorded based
on the verification of the document submitted and/or after the physical assessment of
the works as the case may be. The physical assessment conducted by POWERGRID, if
required, shall be on chargeable basis. Charges shall be as per the POWERGRID norms
prevailing at that time, which shall be intimated by POWERGRID separately. If proposal
for sub-vendor is submitted after 60 days, the Contractor’s proposal normally will not
be considered for current LOA. However, POWERGRID may process the case for
developing more vendors for referred items, if found relevant. In all cases, It is the
responsibility of the Contractor that Project activities do not suffer on account of delay
in approval/non approval of a new sub-vendor.
The responsibility and the basis of inspection for various items & equipment is placed
at Annexure-G along with the requirement of MQP (Manufacturing Quality Plan),
ITP(Inspection & Test Plan), FAT(Factory Acceptance Test) which should be valid &
POWERGRID approved and Level of inspection envisaged against each item.
Contractor shall ensure that order for items where MQP/ITP/FAT is required will be
placed only on vendors having valid MQP/ITP/FAT and where the supplier’s
MQP/ITP/FAT is either not valid or has not been approved by POWERGRID, MQP shall
be generally submitted as per POWERGRID format before placing order.

Items not covered under MQP/ITP/FAT shall be offered for inspection as per
POWERGRID LOA/technical Specifications/POWERGRID approved data sheets/
POWERGRID approved drawings and relevant Indian/International standards.

Inspection Levels: For implementation of projects in a time bound manner and to avoid
any delay in deputation of POWERGRID or its authorized representative, involvement
of POWERGRID for inspection of various items / equipment will be based on the level
below:
Level –I: Contractor to raise all inspection calls and review the report of tests
carried out by the manufacturer, on his own, as per applicable standards/
POWERGRID specification, and submit to concerned POWERGRID
inspection office/Inspection Engineer. CIP/MICC will be issued by
POWERGRID based on review of test reports/certificates of
manufacturers.

____________________________________________________________________________
Technical Specification: GTR Page 11 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

Level – II: Contractor to raise all inspection calls and carry out the inspection on
behalf of POWERGRID on the proposed date of inspection as per
applicable standards/specification. However, in case POWERGRID wishes
to associate itself during inspection, the same would be intimated to
Contractor and CIP/MICC will be issued by POWERGRID. Else, Contractor
would submit their test reports/certificates to POWERGRID. CIP/MICC
will be issued by POWERGRID based on review of test reports/
certificates.
Level - III: Contractor to raise inspection calls for both, stage (as applicable) & final
inspection and carry out the stage inspections (if applicable) on behalf of
POWERGRID on the proposed date of inspection as per applicable
standards/specification. However, in case POWERGRID wishes to
associate itself during stage inspection, the same would be intimated to
Contractor and CIP will be issued by POWERGRID. Else, Contractor would
submit the test reports / certificates of stage inspection after their own
review and CIP will be issued by POWERGRID based on review of test
reports / certificates. Final inspection will be carried out by POWERGRID
and CIP/MICC will be issued by POWERGRID.
Level – IV: Contractor to raise inspection calls for both, stage (as applicable) & final
inspections. POWERGRID will carry out the inspection for both stage &
final inspection as per applicable standards/specification and CIP/MICC
will be issued by POWERGRID.
8.3.2 Contractor shall ensure that to implement the above inspection levels, particularly for
the quality control and inspection at sub-vendor’s works, they would depute sufficient
qualified & experienced manpower in their Quality Control and Inspection department.
Further, to assure quality of construction, Contractor shall have a separate workforce
having appropriate qualification & experience and deploy suitable tools and plant for
maintaining quality requirement during construction in line with applicable Field
Quality Plan (FQP).
8.3.3 The Employer, his duly authorised representative and/or outside inspection agency
acting on behalf of the Employer shall have at all reasonable times access to the
Contractor’s premises or Works and shall have the power at all reasonable times to
ensure that proper Quality Management practices / norms are adhered to, inspect and
examine the materials & workmanship of the Works, to carry out Quality/Surveillance
Audit during manufacture or erection and if part of the Works is being manufactured
or assembled at other premises or works. The Contractor shall obtain for the Employer
and for his duly authorised representative permission to inspect as if the works were
manufactured or assembled on the Contractor’s own premises or works. The
item/equipment, if found unsatisfactory with respect to workmanship or material is
liable to be rejected. The observations for improvements during product/ process
inspection by POWERGRID shall be recorded in Quality Improvement Register
(available & maintained at works) for review & timely compliance of observations.
8.3.4 Contractor shall submit inspection calls over internet through POWERGRID website.
The required vendor code and password to enable raising inspection call will be
furnished to the main Contractor within 30 days of award of contract on submission of
documents by Contractor. After raising the inspection calls, Contractor shall then
proceed as per the message of that particular call which is available on the message
board.
8.3.5 The Employer reserves the right to witness any or all type, acceptance and routine
tests specified for which the Contractor shall give the Employer/Inspector Twenty
one (21) days written notice of any material being ready for testing for each stage of
____________________________________________________________________________
Technical Specification: GTR Page 12 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

testing as identified in the approved quality plan as customer inspection point(CIP)

for indigenous inspections. All inspection calls for overseas material shall be given at
least forty five (45) days in advance. Such tests shall be to the Contractor’s account
except for the expenses of the Inspection Engineer. The Employer/inspector, unless
witnessing of the tests is waived by Employer, will attend such tests within Twenty
one (21) days of the date of which the equipment is notified as being ready for
test/inspection, failing which the Contractor may proceed with the test which shall be
deemed to have been made in the Inspector’s presence and he shall forthwith forward
to the Inspector three copies of tests, duly certified. Contractor shall ensure, before
giving notice for type test, that all drawings and quality plans have been got approved.
The equipment shall be dispatched to site only after approval of Routine and
Acceptance test results and Issuance of Dispatch Clearance in writing by the Employer.
CIP/Material Inspection clearance certificate (MICC) shall be issued by the Employer
after inspection of the equipment or review of test reports as applicable. Employer
may waive off the presence of Employer’s inspecting engineer. In that case test will be
carried out as per approved QP and test certificate will be furnished by the supplier for
approval. CIP/MICC will be issued only after review and approval of the test reports.
8.3.6 Contractor shall generally offer material for inspection as per supply bar chart
approved by POWERGRID and not before 30 days from schedule indicated in the bar
chart. In case Contractor offers material(s) for inspection prior to 30 days from the
scheduled date with necessary approval of POWERGRID, POWERGRID shall inspect the
material and issue CIP only. However, in such an exceptional case, MICC shall be issued
only as per provision of original / revised approved supply schedule.
8.3.7 Contractor shall minimize the number of inspection calls by offering optimum
quantities in each inspection call at the respective manufacturer’s works.
8.3.8 Contractor shall inspect the material themselves and only after they are fully convinced
about the Quality, they shall offer the material for POWERGRID inspection and shall
also ensure that relevant portion of LOA/NOA, approved drawing and data sheets
along with applicable Quality Plans are available at the works of Contractor or their
Sub-vendor before the material is offered for inspection.
8.3.9 Contractor shall ensure that material which has been cleared for dispatch after
inspection will be dispatched within 30 days in case of domestic supplies and within 60
days in case of Off-shore supplies from the date of issuance of CIP. Material which is
not dispatched within stipulated time as above will be reoffered for POWERGRID
inspection or specific approval of POWERGRID QA&I shall be obtained for delayed
dispatch.
8.3.10 The Employer or IE shall give notice in writing to the Contractor, of any objection
either to conformance to any drawings or to any equipment and workmanship which
in his opinion is not in accordance with the Contract. The Contractor shall give due
consideration to such objections and shall either make the modifications that may be
necessary to meet the said objections or shall confirm in writing to the
Employer/Inspection Engineer giving reasons therein, that no modifications are
necessary to comply with the Contract.
8.3.11 All Test Reports and documents to be submitted in English during final inspection of
equipment by POWERGRID or as and when required for submission.
8.3.12 When the factory tests have been completed at the Contractor’s or Sub-Contractor’s
works, the Employer/Inspection Engineer(IE) shall issue a certificate to this effect
within fifteen (15) days after completion of tests & submission of documents by
Contractor/manufacturer but if the tests are not witnessed by the Employer/IE, the
certificate shall be issued within fifteen (15) days of receipt of the Contractor’s Test
certificate by the Employer/IE. Contractor shall, on completion of all tests, submit test
____________________________________________________________________________
Technical Specification: GTR Page 13 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

reports within Ten (10) days to POWERGRID IE. Failure of the Employer/IE to issue
such a certificate shall not prevent the Contractor from proceeding with the Works.
The completion of these tests or the issue of the certificate shall not bind the Employer
to accept the equipment should, it, on further tests after erection, be found not to
comply with the Contract.
8.3.13 In all cases, where the Contract provides for tests whether at the premises or works
of the Contractor or of any Sub- Contractor, the Contractor, except where otherwise
specified, shall provide free of charge such items as labour, materials, electricity, fuel,
water, stores, apparatus and instruments as may be reasonably demanded by the
Employer/Inspector or his authorised representative to carry out effectively such tests
of the equipment in accordance with the Contract and shall give facilities to the
Employer/Inspection Engineer or to his authorised representative to accomplish
testing.
8.3.14 The inspection and acceptance by Employer and issue of Inspection Certificate thereon
shall in no way limit the liabilities and responsibilities of the Contractor in respect of
the agreed quality assurance programme forming a part of the Contract, or if such
equipment is found to be defective at a later stage.
8.3.15 The Employer will have the right of having at his own expenses any other test(s) of
reasonable nature carried out at Contractor’s premises or at site or in any other place
in addition of aforesaid type and routine tests, to satisfy that the material comply with
the specification.
8.3.16 The Employer reserves the right for getting any additional field tests conducted on the
completely assembled equipment at site to satisfy that material complies with
specifications.
8.3.17 Rework/ Re-engineering, if any, on any item/equipment shall be carried out only after
mutual discussions and in accordance with mutually agreed procedure. Contractor
shall submit Joint Inspection Report of equipments under Re-Work/Re-Engineering
alongwith procedure for the same to POWERGRID for approval, before taking up the
Re-Work/Re-Engineering, failing which POWERGRID reserves the right to reject the
equipment.
8.3.18 Contractor may establish a field test Laboratory to execute Civil Construction testing
requirements at site with the condition that all testing equipment shall be calibrated
from POWERGRID approved accredited Testing laboratories, with calibration
certificates kept available at site and all testing personnel employed in the Field
Testing Laboratories to be qualified and experienced Engineers or testing to be carried
out at POWERGRID approved Third Party Laboratories.
8.3.19 Contractor shall ensure that all possible steps are taken to avoid damages to the
equipment during transport, storage and erection.
8.3.20 Contractor shall implement additional stringent quality checks and preparation during
installation of GIS at site (if applicable) as per POWERGRID approved
guidelines/Technical specifications.
8.3.21 Contractor shall ensure commissioning of all CSDs along with Circuit Breakers
wherever applicable.
8.3.22 For EHV transformers/reactors:
Insulation oil shall be as per POWERGRID Technical specifications and same grade
shall be used for impregnation of the active part & testing at the works of
Transformer/Reactor Manufacturer and as well as for filling the Transformer/Reactors
at site. Contractor to ensure that windings for Transformer/Reactors are made in air-
conditioned environment. Core-coil assembly shall be performed in positive
____________________________________________________________________________
Technical Specification: GTR Page 14 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

pressurized dust controlled environment. Dust measurements shall be monitored

regularly at Transformer / Reactor Manufacturer works. Contractor shall ensure that
respective civil foundations & Fire walls for Transformer/Reactors units to be
commissioned, shall be made ready at concerned sites before receipt of
Transformer/Reactors units. All the requisite material for Neutral & Delta Bus
formation required for charging of complete bank of 765KV class 1-ph
Transformer/Reactor units shall be made available at the concerned sites before
receipt of the Transformer/Reactor units at site.

8.3.23 The Employer reserves the right to increase or decrease their involvement in
inspections at Contractor’s Works or at his Sub-Contractor’s premises or at the
Employer’s site or at any other place of Work based on performance of
Contractor/sub-Contractor.

9.0 TYPE TESTING & CLEARANCE CERTIFICATE

9.1 All equipment being supplied shall conform to type tests as per technical specification
and shall be subject to routine tests in accordance with requirements stipulated under
respective sections.
9.2 The reports for all type tests as per technical specification shall be furnished by the
Contractor alongwith equipment / material drawings. However, type test reports of
similar equipments/ material already accepted in POWERGRID shall be applicable for
all projects with similar requirement. The type tests conducted earlier should have
either been conducted in accredited laboratory (accredited based on ISO / IEC Guide
25 / 17025 or EN 45001 by the national accreditation body of the country where
laboratory is located) or witnessed by POWERGRID or representative authorized by
POWERGRID or Utility or representative of accredited test lab.
Unless otherwise specified elsewhere, the type test reports submitted shall be of the
tests conducted within last 10 (ten) years from the date of NOA. In case the test reports
are of the test conducted earlier than 10 (ten) years from the date of NOA, the
contractor shall repeat these test(s) at no extra cost to the Employer.
Further, in the event of any discrepancy in the test reports i.e. any test report not
acceptable due to any design/manufacturing changes or due to non-compliance with
the requirement stipulated in the Technical Specification or any/all type tests not
carried out, same shall be carried out without any additional cost implication to the
Employer.
The Contractor shall intimate the Employer the detailed program about the type tests
atleast two (2) weeks in advance in case of domestic supplies & six (6) weeks in
advance in case of foreign supplies.
9.3 The Employer intends to repeat those type tests which are indicated in the price
schedule and the same shall be payable as per provision of contract. The price of
conducting type tests shall be included in Bid price and break up of these shall be given
in the relevant schedule of Bid Proposal Sheets. These Type test charges would be
considered in bid evaluation. In case Bidder does not indicate charges for any of the
type tests or does not mention the name of any test in the price schedules, it will be
presumed that the particular test has been offered free of charge. Further, in case any
Bidder indicates that he shall not carry out a particular test, his offer shall be
considered incomplete and shall be liable to be rejected. The Employer reserves the
right to waive the repeating of type tests partly or fully and in case of waival, test
charges for the same shall not be payable.

____________________________________________________________________________
Technical Specification: GTR Page 15 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

9.4 The Employer reserves the right to witness any or all the type tests. The Employer
shall bear all expenses for deputation of Employer’s representative(s) for witnessing
the type tests.
9.5 The list of makes of various items, for which Type test reports are not required to
be submitted are specified in Compendium of Vendors (COV).
10.0 TESTS
10.1 Pre-commissioning Tests
On completion of erection of the equipment and before charging, each item of the
equipment shall be thoroughly cleaned and then inspected jointly by the Employer and
the Contractor for correctness and completeness of installation and acceptability for
charging, leading to initial pre-commissioning tests at Site. The list of pre-
commissioning tests to be performed are given in respective chapters and shall be
included in the Contractor’s quality assurance programme.
10.2 Commissioning Tests
10.2.1 The available instrumentation and control equipment will to be used during such tests
and the Employer will calibrate, all such measuring equipment and devices as far as
practicable.
10.2.2 Any special equipment, tools and tackles required for the successful completion of the
Commissioning Tests shall be arranged by the Contractor at his own cost.
10.2.3 The specific tests requirement on equipment have been brought out in the respective
chapters of the technical specification.
10.3.4 PRECOMMISSIONING, COMMISSIONING, TRIAL-RUN & COMPLETION
As soon as the Facilities covered by these specifications are physically completed in all
respects, the Pre commissioning, Commissioning, Trial-run and Completion of the
Facilities, as mentioned below, shall be attained in accordance with the procedure given
in the Conditions of Contract, Vol.-I of the Bidding Documents.
(i) Pre commissioning : As per relevant Sections
(ii) Commissioning : Charging of the Facilities at rated voltage.

Further, wherever appearing in these specifications, the words–‘commissioning

checks’, ‘installation checks’, ‘site tests’, ‘performance guarantee tests for fire protection
system’, are to be considered as ‘pre commissioning checks’.
(iii) Trial-run : Operation of the Facilities or any part thereof by the
Contractor immediately after the Commissioning for a
continuous period of 72 (Seventy two) hours
continuously. In case of interruption due to problem/
failure in the respective equipment, the contractor shall
rectify the problem and after rectification, continuous
72 (Seventy two) hours period start after such
rectification.
(iv) Completion : Upon successful completion of Trial-run.

‘Guarantee Test(s)’ and/or ‘Functional Guarantees’ are applicable only for Substation
Automation System as specified in Section-‘Substation Automation System.’
10.3. The Contractor shall be responsible for obtaining statutory clearances from the
concerned authorities for commissioning the equipment and the switchyard. However
necessary fee shall be reimbursed by POWERGRID on production of requisite
documents.
____________________________________________________________________________
Technical Specification: GTR Page 16 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

11.0 PACKAGING & PROTECTION

11.1 All the equipments shall be suitably protected, coated, covered or boxed and crated to
prevent damage or deterioration during transit, handling and storage at Site till the
time of erection. On request of the Employer, the Contractor shall also submit packing
details/associated drawing for any equipment/material under his scope of supply, to
facilitate the Employer to repack any equipment/material at a later date, in case the
need arises. While packing all the materials, the limitation from the point of view of
availability of Railway wagon sizes in India should be taken into account. The
Contractor shall be responsible for any loss or damage during transportation, handling
and storage due to improper packing. Any demurrage, wharfage and other such charges
claimed by the transporters, railways etc. shall be to the account of the Contractor.
Employer takes no responsibility of the availability of the wagons.
11.2 All coated surfaces shall be protected against abrasion, impact, discolouration and any
other damages. All exposed threaded portions shall be suitably protected with either a
metallic or a non-metallic protecting device. All ends of all valves and pipings and
conduit equipment connections shall be properly sealed with suitable devices to
protect them from damage.
12.0 FINISHING OF METAL SURFACES
12.1 All metal surfaces shall be subjected to treatment for anti-corrosion protection. All
ferrous surfaces for external use unless otherwise stated elsewhere in the specification
or specifically agreed, shall be hot-dip galvanized after fabrication. All steel conductors
including those used for earthing/grounding (above ground level) shall also be
galvanized according to IS: 2629.
12.2 HOT DIP GALVANISING
12.2.1 The minimum weight of the zinc coating shall be 610 gm/sq.m and minimum average
thickness of coating shall be 86 microns for all items having thickness 6mm and above
and 900 gm/sq.m for coastal area (30km from sea shore approximately) or as
specified in Section-Project. For items lower than 6mm thickness requirement of
coating thickness shall be as per relevant ASTM. For surface which shall be embedded
in concrete, the zinc coating shall be 610 gm/sq.m minimum and 900 gm/sq.m for
coastal area as specified in Section-Project.
12.2.2 The galvanized surfaces shall consist of a continuous and uniform thick coating of zinc,
firmly adhering to the surface of steel. The finished surface shall be clean and smooth
and shall be free from defects like discoloured patches, bare spots, unevenness of
coating, spelter which is loosely attached to the steel globules, spiky deposits, blistered
surface, flaking or peeling off, etc. The presence of any of these defects noticed on visual
or microscopic inspection shall render the material liable to rejection.
12.2.3 After galvanizing, no drilling or welding shall be performed on the galvanized parts of
the equipment excepting that nuts may be threaded after galvanizing. Sodium
dichromate or alternate approved treatment shall be provided to avoid formation of
white rust after hot dip galvanization.
12.2.4 The galvanized steel shall be subjected to four numbers of one minute dips in copper
sulphate solution as per IS-2633.
12.2.5 Sharp edges with radii less than 2.5 mm shall be able to withstand four immersions of
the Standard Preece test. All other coatings shall withstand six immersions. The
following galvanizing tests should essentially be performed as per relevant Indian
Standards.
- Coating thickness
- Uniformity of zinc
____________________________________________________________________________
Technical Specification: GTR Page 17 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

- Adhesion test
- Mass of zinc coating
12.2.6 Galvanised material must be transported properly to ensure that galvanised surfaces
are not damaged during transit. Application of touch-up zinc rich paint at site shall be
allowed with approval of Engineer Incharge.
12.3 PAINTING
12.3.1 All sheet steel work shall be degreased, pickled, phosphated in accordance with the IS-
6005 “Code of practice for phosphating iron and sheet”. All surfaces, which will not be
easily accessible after shop assembly, shall beforehand be treated and protected for the
life of the equipment. The surfaces, which are to be finished painted after installation
or require corrosion protection until installation, shall be shop painted with at least
two coats of primer. Oil, grease, dirt and swaf shall be thoroughly removed by emulsion
cleaning. Rust and scale shall be removed by pickling with dilute acid followed by
washing with running water, rinsing with slightly alkaline hot water and drying.
12.3.2 After phosphating, thorough rinsing shall be carried out with clean water followed by
final rinsing with dilute dichromate solution and oven drying. The phosphate coating
shall be sealed with application of two coats of ready mixed, stoving type zinc
chromate primer. The first coat may be “flash dried” while the second coat shall be
stoved.
12.3.3 After application of the primer, two coats of finishing synthetic enamel paint shall be
applied, each coat followed by stoving. The second finishing coat shall be applied after
inspection of first coat of painting.
12.3.4 The exterior and interior colour of the paint in case of new substations shall preferably
be RAL 7032 for all equipment, marshalling boxes, junction boxes, control cabinets,
panels etc. unless specifically mentioned under respective sections of the equipments.
Glossy white colour inside the equipments /boards /panels/junction boxes is also
acceptable. The exterior colour for panels shall be matching with the existing panels in
case of extension of a substation. Each coat of primer and finishing paint shall be of
slightly different shade to enable inspection of the painting. A small quantity of
finishing paint shall be supplied for minor touching up required at site after
installation of the equipments.
12.3.5 In case the contractor proposes to follow his own standard surface finish and
protection procedures or any other established painting procedures, like electrostatic
painting etc., the procedure shall be submitted during detailed engineering for
Employer’s review & approval.

12.3.6 The colour scheme as given below shall be followed for Fire Protection and Air
Conditioning systems

S.No. PIPE LINE Base colour Band colour

Fire Protection System
1 Hydrant and Emulsifier system FIRE RED -
pipeline
2 Emulsifier system detection line – FIRE RED Sea Green
water
3 Emulsifier system detection line –Air FIRE RED Sky Blue
4 Pylon support pipes FIRE RED
Air Conditioning Plant
5 Refrigerant gas pipeline – at Canary Yellow -
compressor suction
____________________________________________________________________________
Technical Specification: GTR Page 18 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

S.No. PIPE LINE Base colour Band colour

6 Refrigerant gas pipeline – at Canary Yellow Red
compressor discharge
7 Refrigerant liquid pipeline Dark Admiralty -
Green
8 Chilled water pipeline Sea Green -
9 Condenser water pipeline Sea Green Dark Blue
The direction of flow shall be marked by → (arrow) in black colour.

Base Colour Direction of flow Band Colour

12.3.7 For aluminium casted surfaces, the surface shall be with smooth finish. Further, in case
of aluminium enclosures, the surface shall be coated with powder (coating thickness of
60 microns) after surface preparation for painting. For stainless steel surfaces, no
painting is envisaged.
13.0 HANDLING, STORING AND INSTALLATION
13.1 In accordance with the specific installation instructions as shown on manufacturer’s
drawings or as directed by the Employer or his representative, the Contractor shall
unload, store, erect, install, wire, test and place into commercial use all the equipment
included in the contract. Equipment shall be installed in a neat, workmanlike manner
so that it is level, plumb, square and properly aligned and oriented. Commercial use of
switchyard equipment means completion of all site tests specified and energisation at
rated voltage.
13.2 Contractor may engage manufacturer’s Engineers to supervise the unloading,
transportation to site, storing, testing and commissioning of the various equipment
being procured by them separately. Contractor shall unload, transport, store, erect, test
and commission the equipment as per instructions of the manufacturer’s supervisory
Engineer(s) and shall extend full cooperation to them.
13.3 The contractor must ensure that the open storage platform (as per Drawing No. C-
ENGG-CVL-STD-PLATFORM-01, Rev.0) is constructed for storage of outdoor type
equipment/material prior to commencement of delivery at site. Outdoor equipment
shall be stored on open storage platform, properly covered with waterproof and
dustproof covers to protect them from water seepage and moisture ingress.
However, all indoor equipments including control & protection panels, Communication
equipments and operating mechanism boxes etc. of outdoor equipments shall be
stored indoors.
Storage of equipment on top of another one is not permitted if the wooden packing is
used and there is possibility of equipment/packing damage. Material opened for joint
inspection shall be repacked properly as per manufacturer’s recommendations.
During storage of material regular periodic monitoring of important parameters like
oil level / leakage, SF6 / Nitrogen pressure etc. shall be ensured by the contractor.
13.4 In case of any doubt/misunderstanding as to the correct interpretation of
manufacturer’s drawings or instructions, necessary clarifications shall be obtained
from the Employer. Contractor shall be held responsible for any damage to the
equipment consequent to not following manufacturer’s drawings/instructions
correctly.
13.5 Where assemblies are supplied in more than one section, Contractor shall make all
necessary mechanical and electrical connections between sections including the
connection between buses. Contractor shall also do necessary adjustments/alignments

____________________________________________________________________________
Technical Specification: GTR Page 19 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

for proper operation of circuit breakers, isolators and their operating mechanisms. All
components shall be protected against damage during unloading, transportation,
storage, installation, testing and commissioning. Any equipment damaged due to
negligence or carelessness or otherwise shall be replaced by the Contractor at his own
expense.
13.6 Contractor shall be responsible for examining all the shipment and notify the Employer
immediately of any damage, shortage, discrepancy etc. for the purpose of Employer’s
information only. The Contractor shall submit to the Employer every week a report
detailing all the receipts during the weeks. However, the Contractor shall be solely
responsible for any shortages or damages in transit, handling and/or in storage and
erection of the equipment at Site. Any demurrage, wharfage and other such charges
claimed by the transporters, railways etc. shall be to the account of the Contractor.
13.7 The Contractor shall be fully responsible for the equipment/material until the same is
handed over to the Employer in an operating condition after commissioning.
Contractor shall be responsible for the maintenance of the equipment/material while
in storage as well as after erection until taken over by Employer, as well as protection
of the same against theft, element of nature, corrosion, damages etc.
13.8 Where material / equipment is unloaded by Employer before the Contractor arrives at
site or even when he is at site, Employer by right can hand over the same to Contractor
and there upon it will be the responsibility of Contractor to store the material in an
orderly and proper manner.
13.9 The Contractor shall be responsible for making suitable indoor storage facilities, to
store all equipment which requires indoor storage.
13.10 The words ‘erection’ and ‘installation’ used in the specification are synonymous.
13.11 Exposed live parts shall be placed high enough above ground to meet the requirements
of electrical and other statutory safety codes.
13.12 The design and workmanship shall be in accordance with the best engineering
practices to ensure satisfactory performance throughout the service life. If at any stage
during the execution of the Contract, it is observed that the erected equipment(s) do
not meet the above minimum clearances the Contractor shall immediately proceed to
correct the discrepancy at his risks and cost.
13.13 Equipment Bases
A cast iron or welded steel base plate shall be provided for all rotating equipment
which is to be installed on a concrete base unless otherwise agreed to by the Employer.
Each base plate shall support the unit and its drive assembly, shall be of a neat design
with pads for anchoring the units, shall have a raised lip all around, and shall have
threaded drain connections.
14.0 TOOLS
14.1 TOOLS & PLANTS (T&P)
The Contractor shall arrange all T&P (such as necessary supports, cranes, ladders,
platforms etc.) for erection, testing & commissioning of the system at his own cost.
Further, all consumables, wastage and damages shall be to the account of contractor.
All such T&P shall be taken back by the contractor after commissioning of the system.

14.2 SPECIAL TOOLS AND TACKLES

The contractor shall supply all special tools and tackles required for Operation and
maintenance of equipment. The special tools and tackles shall only cover items which
____________________________________________________________________________
Technical Specification: GTR Page 20 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

are specifically required for the equipment offered and are proprietary in nature. The
list of special tools and tackles, if any, shall be finalized during detail engineering and
the same shall be supplied without any additional cost implication to the Employer.

14.3 FACILITIES TO BE PROVIDED BY THE EMPLOYER

14.3.1 Employer shall make available the auxiliary supplies at a single point in the substation
on chargeable basis. The prevailing energy rates of the state shall be applicable. All
further distribution from the same for construction supply shall be made by the
contractor. However, in case of failure of power due to any unavoidable circumstances,
the contractor shall make his own necessary arrangements like diesel generator sets
etc. at his own cost so that progress of work is not affected and Employer shall in no
case be responsible for any delay in works because of non-availability of power.
14.3.2 Employer shall make available construction water supply at a single point in the
substation. All further distribution for the same shall be made by the Contractor. In
case of non-availability or inadequate availability of water for construction work, the
contractor shall make his own arrangement at his own cost and the Employer shall in
no case be responsible for any delay in works because of non-availability or inadequate
availability of water.
15.0 AUXILIARY SUPPLY
15.1 The auxiliary power for station supply, including the equipment drive, cooling system
of any equipment, air-conditioning, lighting etc shall be designed for the specified
Parameters as under. The DC supply for the instrumentation and PLCC system shall
also conform the parameters as indicated in the following table:
Normal Variation in Frequency in Phase/Wire Neutral
Voltage Voltage HZ connection
415V + 10% 50 + 5% 3/4 Wire Solidly Earthed.
240V + 10% 50 + 5% 1/2 Wire Solidly Earthed.
220V 190V to 240V DC Isolated 2 -
wire System
110V 95V to 120V DC Isolated 2 -
wire System
48V -- DC 2 wire -
system (+)
earthed

Combined variation of voltage and frequency shall be limited to + 10%.

16.0 SUPPORT STRUCTURE
16.1 The equipment support structures shall be suitable for equipment connections at the
first level i.e 14.0 meter, 8.0 meter, 5.9 meter and 4.6 meter from plinth level for
765kV, 400kV, 220kV and 132kV substations respectively. All equipment support
structures shall be supplied alongwith brackets, angles, stools etc. for attaching the
operating mechanism, control cabinets & marshalling box (wherever applicable) etc.
16.2 The minimum vertical distance from the bottom of the lowest porcelain part of the
bushing, porcelain enclosures or supporting insulators to the bottom of the equipment
base, where it rests on the foundation pad shall be 2.55 metres.
17.0 CLAMPS AND CONNECTORS INCLUDING TERMINAL CONNECTORS

____________________________________________________________________________
Technical Specification: GTR Page 21 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

17.1 All power clamps and connectors shall conform to IS:5561 or other equivalent
international standard and shall be made of materials listed below :
Sl. No. Description Materials
a) For connecting ACSR Aluminum alloy casting, conforming to
conductors/AAC conductors/ designation A6 of IS:617 and all test shall
Aluminium tube conform to IS:617
b) For connecting equipment Bimetallic connectors made from
terminals mad of copper with aluminum alloy casting, conforming to
ACSR conductors/AAC designation A6 of IS:617 with 2mm thick
conductors/ Aluminium tube bimetallic liner/strip and all test shall
conform to IS:617
c) For connecting G.I Galvanised mild steel shield wire
d) Bolts, nuts & plain washers Electro-galvanised for sizes below M12,
for others hot dip galvanised.
e) Spring washers Electro-galvanised mild steel suitable for
atleast service condition-3 as per IS:1573

17.2 Necessary clamps and connectors shall be supplied for all equipment and connections.
If corona rings are required to meet these requirements they shall be considered as
part of that equipment and included in the scope of work.
17.3 Where copper to aluminum connections are required, bi-metallic clamps shall be used,
which shall be properly designed to ensure that any deterioration of the connection is
kept to a minimum and restricted to parts which are not current carrying or subjected
to stress.
17.4 Low voltage connectors, grounding connectors and accessories for grounding all
equipment as specified in each particular case, are also included in the scope of Work.
17.5 No current carrying part of any clamp shall be less than 10 mm thick. All ferrous parts
shall be hot dip galvanised. Copper alloy liner/strip of minimum 2 mm thickness shall
be cast integral with aluminum body or 2 mm thick bi-metallic liner/strips shall be
provided for Bi-metallic clamps.
17.6 All casting shall be free from blow holes, surface blisters, cracks and cavities. All sharp
edges and corners shall be blurred and rounded off.
17.7 Flexible connectors, braids or laminated straps made for the terminal clamps for bus
posts shall be suitable for both expansion or through (fixed/sliding) type connection of
IPS AL tube as required. In both the cases the clamp height (top of the mounting pad to
centre line of the tube) should be same.
17.8 Current carrying parts (500A and above) of the clamp/connector shall be provided
with minimum four numbers of bolts preferably for 132kV & above.
17.9 All current carrying parts shall be designed and manufactured to have minimum
contact resistance.
17.10 Power Clamps and connectors shall be designed to control corona as per requirement.

17.11 Tests
Clamps and connectors should be type tested as per IS:5561 and shall also be subjected
to routine tests as per IS:5561. Following type test reports shall be submitted for

____________________________________________________________________________
Technical Specification: GTR Page 22 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

approval. Type test once conducted shall hold good. The requirement of test conducted
within last ten years, shall not be applicable.
i) Temperature rise test (maximum temperature rise allowed is 35°C over 50°C
ambient)
ii) Short time current test
iii) Corona (dry) [for 400kV and above] and RIV (dry) test [for 132kV and above
voltage level clamps]
iv) Resistance test and tensile test
18.0 CONTROL CABINETS, JUNCTION BOXES, TERMINAL BOXES & MARSHALLING
BOXES FOR OUTDOOR EQUIPMENT
18.1 All types of boxes, cabinets etc. shall generally conform to & be tested in accordance
with IS-5039/IS-8623, IEC-60439, as applicable, and the clauses given below:
18.2 Control cabinets, junction boxes, Marshalling boxes & terminal boxes shall be made of
stainless steel of atleast 1.5 mm thick or aluminum enclosure of atleast 1.6 mm thick
and shall be dust, water and vermin proof. Stainless steel used shall be of grade SS304
(SS316 for coastal area) or better. The box shall be properly braced to prevent
wobbling. There shall be sufficient reinforcement to provide level surfaces, resistance
to vibrations and rigidity during transportation and installation. In case of aluminum
enclosed box the thickness of aluminum shall be such that it provides adequate rigidity
and long life as comparable with sheet steel of specified thickness.
18.3 A canopy and sealing arrangements for operating rods shall be provided in marshalling
boxes / Control cabinets to prevent ingress of rain water.
18.4 Cabinet/boxes shall be provided with double hinged doors with padlocking
arrangements. The distance between two hinges shall be adequate to ensure uniform
sealing pressure against atmosphere.
18.5 All doors, removable covers and plates shall be gasketed all around with suitably
profiled EPDM/Neoprene/PU gaskets. The gasket shall be tested in accordance with
approved quality plan, IS:11149 and IS:3400. Ventilating Louvers, if provided, shall
have screen and filters. The screen shall be fine wire mesh made of brass.
Further, the gasketing arrangement shall be such that gaskets are pasted in slots (in
door fabrication/gasket itself) in order to prevent ingression of dust and moisture
inside the panels so that no internal rusting occurs in panels during the operation of
the equipment.
18.6 All boxes/cabinets shall be designed for the entry of cables by means of weather proof
and dust-proof connections. Boxes and cabinets shall be designed with generous
clearances to avoid interference between the wiring entering from below and any
terminal blocks or accessories mounted within the box or cabinet. Suitable cable gland
plate above the base of the marshalling kiosk/box shall be provided for this purpose
along with the proper blanking plates. Necessary number of cable glands shall be
supplied and fitted on this gland plate. Gland plate shall have provision for some future
glands to be provided later, if required. The Nickel plated glands shall be dust proof,
screw on & double compression type and made of brass. The gland shall have provision
for securing armour of the cable separately and shall be provided with earthing tag.
The glands shall conform to BS:6121.
18.7 A 240V, single phase, 50 Hz, 15 amp AC plug and socket shall be provided in the
cabinet with ON-OFF switch for connection of hand lamps. Plug and socket shall be of
industrial grade.

____________________________________________________________________________
Technical Specification: GTR Page 23 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

18.8 LED based illumination of minimum 9 watts shall be provided. The switching of the
fittings shall be controlled by the door switch.
For junction boxes of smaller sizes such as lighting junction box, manual operated
earth switch mechanism box etc., plug socket, heater and illumination is not required
to be provided.
18.9 All control switches shall be of MCB/rotary switch type and Toggle/piano switches
shall not be accepted.
18.10 Earthing of the cabinet shall be ensured by providing two separate earthing pads. The
earth wire shall be terminated on to the earthing pad and secured by the use of self
etching washer. Earthing of hinged door shall be done by using a separate earth wire.
18.11 The bay marshalling kiosks shall be provided with danger plate and a diagram showing
the numbering/connection/feruling by pasting the same on the inside of the door.
18.12 The following routine tests alongwith the routine tests as per IS:5039 shall also be
conducted:
i) Check for wiring
ii) Visual and dimension check
18.13 The enclosure of bay marshalling kiosk, junction box, terminal box and control cabinets
shall conform to IP-55 as per IS:13947 including application of 2KV rms for 1 (one)
minute, insulation resistance and functional test after IP-55 test.
19.0 DISPOSAL OF PACKING MATERIAL & WASTE FROM CONSTRUCTION SITE
After completion of the work, Contractor shall dispose-off all the packing & waste
materials including empty conductor drums, cable drums, wooden containers, oil
drums, gas cylinders and other waste/scrapped materials from construction site at his
own cost and shall make the substation area properly cleaned.
20.0 TERMINAL BLOCKS AND WIRING
20.1 Control and instrument leads from the switchboards or from other equipment will be
brought to terminal boxes or control cabinets in conduits. All interphase and external
connections to equipment or to control cubicles will be made through terminal blocks.
20.2 Terminal blocks shall be 650V grade and have continuous rating to carry the maximum
expected current on the terminals and non-breakable type. These shall be of moulded
piece, complete with insulated barriers, stud type terminals, washers, nuts and lock
nuts. Screw clamp, overall insulated, insertion type, rail mounted terminals can be used
in place of stud type terminals. But the terminal blocks shall be non-disconnecting stud
type except for the secondary junction boxes of Current Transformer and Voltage
Transformer.
20.3 Terminal blocks for current transformer and voltage transformer secondary leads shall
be provided with test links and isolating facilities. The current transformer secondary
leads shall also be provided with short circuiting and earthing facilities.
20.4 The terminal shall be such that maximum contact area is achieved when a cable is
terminated. The terminal shall have a locking characteristic to prevent cable from
escaping from the terminal clamp unless it is done intentionally.
20.5 The conducting part in contact with cable shall preferably be tinned or silver plated
however Nickel plated copper or zinc plated steel shall also be acceptable.
20.6 The terminal blocks shall be of extensible design, multilayer terminal arrangement is
not allowed in any junction box (Common MB, Individual MB, JB etc.). There should be

____________________________________________________________________________
Technical Specification: GTR Page 24 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

sufficient space at both sides of terminals so that ferrule number of wires / TB

numbers are clearly visible during wire removal or insertion.
20.7 The terminal blocks shall have locking arrangement to prevent its escape from the
mounting rails.
20.8 The terminal blocks shall be fully enclosed with removable covers of transparent, non-
deteriorating type plastic material. Insulating barriers shall be provided between the
terminal blocks. These barriers shall not hinder the operator from carrying out the
wiring without removing the barriers.
20.9 Unless otherwise specified terminal blocks shall be suitable for connecting the
following conductors on each side.
a) All circuits except Minimum of two of 2.5 sq mm
CT/PT circuits copper flexible.
b) All CT/PT circuits Minimum of 4 nos. of 2.5 sq mm
copper flexible.
20.10 The arrangements shall be in such a manner so that it is possible to safely connect or
disconnect terminals on live circuits and replace fuse links when the cabinet is live.
20.11 Atleast 20 % spare terminals shall be provided on each panel/cubicle/box and these
spare terminals shall be uniformly distributed on all terminals rows.
20.12 There shall be a minimum clearance of 250 mm between the First/bottom row of
terminal block and the associated cable gland plate for outdoor ground mounted
marshalling box and the clearance between two rows of terminal blocks shall be a
minimum of 150 mm.
20.13 The Contractor shall furnish all wire, conduits and terminals for the necessary
interphase electrical connections (where applicable) as well as between phases and
common terminal boxes or control cabinets. For equipments rated for 400 kV and
above the wiring required in these items shall be run in metallic ducts or shielded
cables in order to avoid surge overvoltages either transferred through the equipment
or due to transients induced from the EHV circuits.
20.14 All input and output terminals of each control cubicle shall be tested for surge
withstand capability in accordance with the relevant IEC Publications, in both
longitudinal and transverse modes. The Contractor shall also provide all necessary
filtering, surge protection, interface relays and any other measures necessary to
achieve an impulse withstand level at the cable interfaces of the equipment.
21.0 LAMPS & SOCKETS
21.1 Lamps & Sockets
All lamps shall use a socket base as per IS-1258, except in the case of signal lamps.
All sockets (convenience outlets) shall be suitable to accept both 5 Amp & 15 Amp pin
round Standard Indian plugs. They shall be switched sockets with shutters.
21.2 Hand Lamp:
A 240 Volts, single Phase, 50 Hz AC plug point shall be provided in the interior of each
cubicle with ON-OFF Switch for connection of hand lamps.
21.3 Switches and Fuses:
21.3.1 Each panel shall be provided with necessary arrangements for receiving, distributing,
isolating and fusing of DC and AC supplies for various control, signaling, lighting and
space heater circuits. The incoming and sub-circuits shall be separately provided with
miniature circuit breaker / switch fuse units. Selection of the main and Sub-circuit fuse
____________________________________________________________________________
Technical Specification: GTR Page 25 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

ratings shall be such as to ensure selective clearance of sub-circuit faults. Potential

circuits for relaying and metering shall be protected by HRC fuses.
21.3.2 All fuses shall be of HRC cartridge type conforming to IS:9228 mounted on plug-in type
fuse bases. Miniature circuit breakers with thermal protection and alarm contacts will
also be accepted. All accessible live connection to fuse bases shall be adequately
shrouded. Fuses shall have operation indicators for indicating blown fuse condition.
Fuse carrier base shall have imprints of the fuse rating and voltage.
22.0 Bushings, Hollow Column Insulators, Support Insulators:
22.1 Bushings shall be manufactured and tested in accordance with IS:2099 & IEC-60137
while hollow column insulators shall be manufactured and tested in accordance with
IEC-62155/IS:5621.The support insulators shall be manufactured and tested as per
IS:2544/IEC-60168 and IEC-60273. The insulators shall also conform to IEC-60815 as
applicable.
The bidder may also offer composite hollow insulators, conforming to IEC-61462.
22.2 Support insulators, bushings and hollow column insulators shall be manufactured from
high quality porcelain. Porcelain used shall be homogeneous, free from laminations,
cavities and other flaws or imperfections that might affect the mechanical or dielectric
quality and shall be thoroughly vitrified tough and impervious to moisture.
22.3 Glazing of the porcelain shall be uniform brown in colour, free from blisters, burrs and
similar other defects.
22.4 Support insulators/bushings/hollow column insulators shall be designed to have
ample insulation, mechanical strength and rigidity for the conditions under which they
will be used.
22.5 When operating at normal rated voltage there shall be no electric discharge between
the conductors and bushing which would cause corrosion or injury to conductors,
insulators or supports by the formation of substances produced by chemical action. No
radio interference shall be caused by the insulators/bushings when operating at the
normal rated voltage.
22.6 Bushing porcelain shall be robust and capable of withstanding the internal pressures
likely to occur in service. The design and location of clamps and the shape and the
strength of the porcelain flange securing the bushing to the tank shall be such that
there is no risk of fracture. All portions of the assembled porcelain enclosures and
supports other than gaskets, which may in any way be exposed to the atmosphere shall
be composed of completely non hygroscopic material such as metal or glazed
porcelain.
22.7 All iron parts shall be hot dip galvanised and all joints shall be air tight. Surface of
joints shall be trued up porcelain parts by grinding and metal parts by machining.
Insulator/bushing design shall be such as to ensure a uniform compressive pressure
on the joints.
22.8 Tests
In bushing, hollow column insulators and support insulators shall conform to type
tests and shall be subjected to routine tests in accordance with IS:2099 & IS:2544 &
IS:5621.
22.9 RTV Coating on porcelain insulators (for coastal area)
RTV coating shall be done at site on all porcelain insulators (i.e. bushings, hollow and
solid insulators, disc insulators etc.) for substation(s) in coastal area as defined
elsewhere. The cost of RTV coating shall be deemed to be included in the respective

____________________________________________________________________________
Technical Specification: GTR Page 26 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

equipment/items’ erection cost. The technical details of RTV coating is attached in

Annexure-H.
23.0 MOTORS
Motors shall be “Squirrel Cage” three phase induction motors of sufficient size capable
of satisfactory operation for the application and duty as required for the driven
equipment and shall be subjected to routine tests as per applicable standards. The
motors shall be of approved make.
23.1 Enclosures
a) Motors to be installed outdoor without enclosure shall have hose proof enclosure
equivalent to IP-55 as per IS: 4691. For motors to be installed indoor i.e. inside a
box, the motor enclosure, shall be dust proof equivalent to IP-44 as per IS: 4691.
b) Two independent earthing points shall be provided on opposite sides of the
motor for bolted connection of earthing conductor.
c) Motors shall have drain plugs so located that they will drain water resulting from
condensation or other causes from all pockets in the motor casing.
d) Motors weighing more than 25 Kg. shall be provided with eyebolts, lugs or other
means to facilitate lifting.
23.2 Operational Features
a) Continuous motor rating (name plate rating) shall be at least ten (10) percent
above the maximum load demand of the driven equipment at design duty point
and the motor shall not be over loaded at any operating point of driven
equipment that will rise in service.
b) Motor shall be capable at giving rated output without reduction in the expected
life span when operated continuously in the system having the particulars as
given in Clause 15.0 of this Section.
23.3 Starting Requirements:
a) All induction motors shall be suitable for full voltage direct-on-line starting.
These shall be capable of starting and accelerating to the rated speed alongwith
the driven equipment without exceeding the acceptable winding temperature
even when the supply voltage drops down to 80% of the rated voltage.
b) Motors shall be capable of withstanding the electrodynamic stresses and heating
imposed if it is started at a voltage of 110% of the rated value.
c) The locked rotor current shall not exceed six (6) times the rated full load current
for all motors, subject to tolerance as given in IS:325.
d) Motors when started with the driven equipment imposing full starting torque
under the supply voltage conditions specified under Clause 15.0 shall be capable
of withstanding atleast two successive starts from cold condition at room
temperature and one start from hot condition without injurious heating of
winding. The motors shall also be suitable for three equally spread starts per
hour under the above referred supply condition.
e) The locked rotor withstand time under hot condition at 110% of rated voltage
shall be more than starting time with the driven equipment of minimum
permissible voltage by at least two seconds or 15% of the accelerating time
whichever is greater. In case it is not possible to meet the above requirement, the
Bidder shall offer centrifugal type speed switch mounted on the motor shaft
which shall remain closed for speed lower than 20% and open for speeds above

____________________________________________________________________________
Technical Specification: GTR Page 27 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

20% of the rated speed. The speed switch shall be capable of withstanding 120%
of the rated speed in either direction of rotation.
23.4 Running Requirements:

a) The maximum permissible temperature rise over the ambient temperature of 50

degree C shall be within the limits specified in IS:325 (for 3-phase induction
motors) after adjustment due to increased ambient temperature specified.
b) The double amplitude of motor vibration shall be within the limits specified in IS:
4729. Vibration shall also be within the limits specified by the relevant standard
for the driven equipment when measured at the motor bearings.
c) All the induction motors shall be capable of running at 80% of rated voltage for a
period of 5 minutes with rated load commencing from hot condition.
23.5 TESTING AND COMMISSIONING
An indicative list of tests is given below. Contractor shall perform any additional test
based on specialities of the items as per the field Q.P./Instructions of the equipment
Contractor or Employer without any extra cost to the Employer. The Contractor shall
arrange all instruments required for conducting these tests alongwith calibration
certificates and shall furnish the list of instruments to the Employer for approval.
(a) Insulation resistance.
(b) Phase sequence and proper direction of rotation.
(c) Any motor operating incorrectly shall be checked to determine the cause and the
conditions corrected.
24. TECHNICAL REQUIREMENT OF EQUIPMENTS
Following equipment shall be offered from the manufacturer(s) who meets the
technical requirements as stipulated here, provided the same equipment are not
covered under the Bidder’s Qualifying requirement of the Bidding Documents.
Legend:
* : voltage class of respective equipment as applicable.
#: satisfactory operation means certificate issued by the Employer/Utility
certifying the operation without any adverse remark.
@: Circuit Breaker Bay means a bay used for controlling a line or a transformer
or a reactor or a bus section or a bus coupler and comprising of at least one
circuit breaker, one disconnector and three nos. of single phase CTs / Bushing
CTs
NOA: means Notification Of Award
24.1 Technical requirements for 765/400/220/132/110kV* Air Insulated Switchgear
(AIS) Equipment* (i.e Circuit Breaker, Isolator, Current Transformer, Capacitive
Voltage transformer, Inductive Voltage transformer, Surge Arrester and Wave
Trap)
(i) The manufacturer(s) whose 765/400/220/132/110kV* equipment(s) are
offered, must have, manufactured, type tested (as per IEC/IS or equivalent
standard) and supplied 715/345/220/132/110kV* or higher voltage class
equipment(s), which are in satisfactory operation# for atleast two (2) years as
on the date of NOA.

____________________________________________________________________________
Technical Specification: GTR Page 28 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

(ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India for the offered equipment and not meeting the requirement
stipulated in (i) above, can also be considered provided that
a) 715/345/220/132/110kV* or higher Voltage class equipment(s) must have
been manufactured in the above Indian works & type tested (as per IEC/IS
standard) and supplied as on the date of NOA.

b) Contractor shall furnish performance guarantee for an amount of 10% of the

ex-works cost of the equipments(s)* and this performance guarantee shall
be in addition to the contract performance guarantee to be submitted by the
contractor.
24.2 Technical Requirement for 765kV class Transformer
(i) The Manufacturer whose 765kV Transformer(s) are offered must have designed,
manufactured, tested & supplied 715 kV or higher voltage class one (1) number
three phase Transformer of atleast 500 MVA capacity (or equivalent capacity in a
bank of three (3) numbers single phase units). These transformer(s) must have
been in satisfactory operation# for atleast two (2) years as on the date of NOA.

(ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India and not meeting the requirement stipulated in (i) above, can
also be considered provided that

a) 715kV or higher voltage class one (1) number three phase Transformer of
atleast 500 MVA capacity (or equivalent capacity in a bank of three (3)
numbers single phase units) must have been manufactured in the above
Indian works based on technological support of collaborator, type tested (as
per IEC/IS standard) and supplied as on the date of NOA.

b) The collaborator meets the requirements stipulated in (i) above. A valid

collaboration agreement for technology transfer / license to design,
manufacture, test and supply 765kV transformer in India, shall be
submitted.

c) the collaborator shall furnish performance guarantee for an amount of 10%

of the ex-works cost of such equipment(s) and this performance guarantee
shall be in addition to contract performance guarantee to be submitted by
the contractor.

24.3 Technical Requirement for 765kV class Reactor

(i) The Manufacturer whose 765kV Reactor(s) are offered must have designed,
manufactured, tested & supplied 715kV or higher voltage class one (1) number
three phase Reactor of atleast 240 MVAR capacity (or equivalent capacity in a
bank of three (3) numbers single phase units). These Reactor(s) must have been
in satisfactory operation# for atleast two (2) years as on the date of NOA.
OR
The Manufacturer must have designed, manufactured, tested & supplied 715kV
or higher voltage class one (1) number three phase Transformer of atleast
500MVA capacity (or equivalent capacity in a bank of three (3) numbers single
phase units). These Transformer(s) must have been in satisfactory operation# for
atleast two (2) years as on the date of NOA. And the manufacturer must have
designed, manufactured, tested & supplied 345kV or higher voltage class one (1)
number three phase Reactor of atleast 50MVAR capacity (or equivalent capacity
____________________________________________________________________________
Technical Specification: GTR Page 29 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

in a bank of three (3) numbers single phase units). These Reactors must have
been in satisfactory operation# for atleast two (2) years as on the date of NOA.

(ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India and not meeting the requirement stipulated in (i) above, can
also be considered provided that

a) 715kV or higher voltage class one (1) number three phase Reactor of atleast
240MVAR capacity (or equivalent capacity in a bank of three (3) numbers
single phase units) must have been manufactured in the above Indian works
based on technological support of collaborator, type tested (as per IEC/IS
standard) and supplied as on the date of NOA.

b) The collaborator meets the requirements stipulated in (i) above. A valid

collaboration agreement for technology transfer/license to design,
manufacture, test and supply 765kV Reactor in India, shall be submitted.

c) the collaborator shall furnish performance guarantee for an amount of 10%

of the ex-works cost of such equipment(s) and this performance guarantee
shall be in addition to contract performance guarantee to be submitted by
the contractor.

24.4 Technical Requirement for 400kV, 220kV, 132kV and 110kV class Transformer

(i) The manufacturer whose transformer(s) are offered must have designed,
manufactured, tested and supplied 400kV/220kV/132kV/110kV* or higher
voltage class transformers. These Transformer(s) must have been in satisfactory
operation# for atleast two (2) years as on the date of NOA.

(ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India and not meeting the requirement stipulated in (i) above, can
also be considered provided that

a) 220kV (applicable for supply of 400kV and 220kV class Transformer)/

132kV (applicable for supply of 132kV & 110kV class Transformer) or
higher voltage class transformers must have been designed, manufactured
in the above Indian works based on technological support of collaborator,
type tested (as per IEC/IS standard) and supplied as on the date of NOA.

b) The collaborator meets the requirements stipulated in (i) above. A valid

collaboration agreement for technology transfer / license to design,
manufacture, test and supply 400kV/220kV/132kV/110kV* transformer in
India, shall be submitted.

c) the collaborator shall furnish performance guarantee for an amount of 10%

of the ex-works cost of such equipment(s) and this performance guarantee
shall be in addition to contract performance guarantee to be submitted by
the contractor.

24.5 Technical Requirement for 400kV, 220kV and 132kV class Reactor

(i) The Manufacturer whose 400kV/220kV/132kV* Reactor(s) are offered must

have designed, manufactured, tested & supplied 400kV/220kV/132kV* or higher

____________________________________________________________________________
Technical Specification: GTR Page 30 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

voltage class. These Reactor(s) must have been in satisfactory operation# for
atleast two (2) years as on the date of NOA.

(ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India and not meeting the requirement stipulated in (i) above, can
also be considered provided that

a) Such manufacturer has designed, manufactured based on technological

support of collaborator, type tested (as per IEC/IS standard) and supplied
400kV class transformer or 220kV or above class shunt reactors as on the
date of NOA.

b) The collaborator meets the requirements stipulated in (i) above. A valid

collaboration agreement for technology transfer/license to design,
manufacture, test and supply the Reactor in India, shall be submitted.

c) the collaborator shall furnish performance guarantee for an amount of 10%

of the ex-works cost of such equipment(s) and this performance guarantee
shall be in addition to contract performance guarantee to be submitted by
the contractor.

24.6 Technical Requirement for 400 kV Grade XLPE Power Cables

(i) The manufacturer(s) whose XLPE Power Cables are offered must have designed,
manufactured, type tested and supplied in a single contract atleast 5 (five) km of
single core, 400kV grade XLPE insulated cable which must be in operation for
atleast 2 (two) years as on the date of NOA.

(ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India and not meeting the requirement stipulated in (i) above, can
also be considered provided that

a) The manufacturer must have designed, manufactured, type tested and

supplied 400kV grade XLPE insulated cable and which must be in
satisfactory operation# for atleast one (1) year as on the date of NOA.
OR
b) The manufacturer must have designed, manufactured, type tested and
completed Pre-qualification (PQ) tests as per IEC for 400kV grade XLPE
insulated Cable as on the date of NOA.
24.7 Technical Requirement for 220KV Grade XLPE Power Cables
(i) The manufacturer(s) whose XLPE Power Cables are offered must have designed,
manufactured, type tested and supplied in a single contract atleast 5 (five) km of
single core, 220kV or higher grade XLPE insulated cable which must be in
operation for atleast 2 (two) years as on the date of NOA.

(ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India and not meeting the requirement stipulated in (i) above, can
also be considered provided that

a) The manufacturer must have designed, manufactured, type tested and

supplied 220kV or higher grade XLPE insulated cable and which must be in
satisfactory operation# for atleast one (1) year as on the date of NOA.
OR
____________________________________________________________________________
Technical Specification: GTR Page 31 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

b) The manufacturer must have designed, manufactured, type tested and

completed Pre-qualification (PQ) tests as per IEC for 220kV or higher grade
XLPE insulated Cable as on the date of NOA.
24.8 Technical Requirement for 132KV, 110kV, 66kV Grade XLPE Power Cables
(i) The manufacturer(s) whose XLPE Power Cables are offered must have
designed, manufactured, type tested and supplied in a single contract atleast 5
(five) km of single core, 132KV/110kV/66kV* or higher grade XLPE insulated
cable which must be in satisfactory operation# for atleast two (2) years as on
the date of NOA.

(ii) Alternatively, the manufacturer, who have established manufacturing and

testing facilities in India and not meeting the requirement stipulated in (i)
above, can also be considered provided that

a) The manufacturer must have designed, manufactured, type tested and supplied
132KV/110kV/66kV* or higher grade XLPE insulated cable and which must be
in satisfactory operation# for atleast one (1) year as on the date of NOA.
24.9 Technical Requirement for 1.1 KV Grade PVC Control Cable
The manufacturer(s), whose PVC control cables are offered, must have designed,
manufactured, tested and supplied in a single contract atleast 100 Kms of 1.1kV grade
PVC insulated control cables as on the originally scheduled date of bid opening.
Further the manufacturer must also have designed, manufactured, tested and supplied
atleast 1 km of 27C x 2.5 Sq.mm or higher size as on the date of NOA.
24.10 Technical Requirement for 1.1 KV Grade PVC Power Cable
The manufacturer(s), whose PVC Power Cables are offered, must have designed,
manufactured, tested and supplied in a single contract atleast 100 Kms of 1.1kV or
higher grade PVC insulated power cables as on the date of NOA/award. Further the
manufacturer must also have designed, manufactured, tested and supplied atleast 1 km
of 1C x 150 Sq. mm or higher size as on the date of NOA.
24.11 Technical Requirement for 1.1 KV Grade XLPE Power Cables
The manufacturer(s), whose XLPE Power cables are offered, must have designed,
manufactured, tested and supplied in a single contract atleast 25 Kms of 1.1 KV or
higher grade XLPE insulated power cables as on the date of NOA/award. Further the
manufacturer must also have designed, manufactured, tested and supplied atleast 1 km
of 1C x 630 Sq. mm or higher size as on the date of NOA.
24.12 Technical Requirement for LT Switchgear
i) The manufacturer whose LT Switchgear(s) are offered, must be a manufacturer of
LT Switchboards of the type and rating being offered. He must have designed,
manufactured, tested and supplied atleast 50 nos. draw out circuit breaker panels,
out of which atleast 5 nos. should have been with relay and protection schemes
with current transformer. He must have also manufactured atleast 50 nos. MCC
panels comprising of MCCBs (ie Moulded Case Circuit Breakers) modules of the type
offered which must be in satisfactory operation# as on the date of NOA.
ii) The Switchgear items (such as circuit breakers, fuse switch units, contactors etc.),
may be of his own make or shall be procured from reputed manufacturers and of
proven design, atleast one hundred circuit breakers of the make and type being
offered must have been in satisfactory operation# as on the date of NOA.

____________________________________________________________________________
Technical Specification: GTR Page 32 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

24.13 Technical Requirements for Battery

The manufacturer whose Batteries are offered, must have designed, manufactured and
supplied DC Batteries of the type specified and being offered, having a capacity of
atleast 600 AH and these must be satisfactory operation# for atleast two (2) years in
power sector or industrial installations as on the date of NOA.
24.14 Technical Requirements for Battery Charger
The manufacturer, whose Battery Chargers are offered, must have designed,
manufactured and supplied Battery Chargers generally of the type offered, with static
automatic voltage regulators and having a continuous output of atleast ten (10) KW
and these must have been in satisfactory operation# as on the date of NOA.
24.15 Technical Requirements for LT Transformer
i) The manufacturer, whose LT transformer(s) are offered, must have designed,
manufactured, type tested including short circuit test as per IEC/IS or equivalent
standards and supplied transformer(s) of atleast 33kV class of 630kVA or higher.
The transformer must have been in satisfactory operation# for atleast two (2)
years as on the date of NOA.
ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India and not meeting the requirement stipulated in (i) above, can also
be considered provided that
a) At least 33kV class of 630 kVA or higher rating LT transformer(s) must have
been designed, manufactured in the above Indian works, type tested (as per
IEC/IS standard) including short circuit test and supplied as on the date of
NOA.

b) the contractor shall furnish performance guarantee for an amount of 10% of

the ex-works cost of the equipment(s) and this performance guarantee shall
be in addition to contract performance guarantee to be submitted by the
contractor.
24.16 Technical Requirements for Composite Long Rod Polymer Insulator (765kV &
400kV)
(i) The manufacturer whose Composite Long rod Insulator are offered, must have
designed, manufactured, tested and supplied Composite Long rod Insulator of
120KN or higher electro-mechanical strength for 765kV/400kV* or higher
voltage class and the same must have been in satisfactory operation# for atleast
two (2) years as on the date of NOA.

(ii) Alternatively, the manufacturer, who have established manufacturing and testing
facilities in India and not meeting the requirement stipulated in (i) above, can
also be considered provided that

a) The manufacturer must have designed, manufactured, type tested and supplied
Composite Long rod Insulator of 120KN or above electro-mechanical strength
for 765kV/400kV* or higher voltage class and the same must have been in
satisfactory operation# as on the date of NOA.

b) Contractor shall furnish performance guarantee for an amount of 10% of the ex-
works cost of the equipments(s)* and this performance guarantee shall be in
addition to the contract performance guarantee to be submitted by the
contractor.

____________________________________________________________________________
Technical Specification: GTR Page 33 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

24.17 Technical Requirements for Control, Relay & Protection System and Sub-station
Automation System
The manufacturer whose Control, Relay & Protection System (Control & protection
Intelligent Electronic Devices (IEDs)), and Sub-station Automation System (as
applicable) are offered, must have designed, manufactured, tested, installed and
commissioned Control, Relay & Protection system along with Sub-station Automation
System which must have been in satisfactory operation# on (i) 400 kV system
[applicable for 765kV substation] & (ii) specified voltage level or above [applicable for
400kV & below substation] for atleast two (2) years as on the date of NOA.
AND
The Manufacturer or their joint venture or subsidiary company or parent company
must be a manufacturer of control and protection IEDs and must have established
repair, testing and integration (atleast for 4 bays) facilities for Control, Relay &
Protection System and Sub-station Automation System in India.
24.18 Technical Requirements for analog and digital PLCC panels (765kV, 400kV,
220kV & 132kV)
(i) The manufacturer whose PLCC panels are offered, must have designed,
manufactured, tested, supplied and commissioned PLCC panels for (i) 400kV
system or above [applicable for 765 kV & 400 kV substation], (ii) 220 kV
System or above [applicable for 220 kV Substation] & (iii) 132 kV system or
above [applicable for 132 kV substation] and the same must have been in
satisfactory operation# for atleast two (2) years as on the date of NOA.
(ii) Alternatively, the manufacturer, who have established manufacturing and
testing facilities in India and not meeting the requirement stipulated in (i)
above, can also be considered provided that
a) PLCC panels must have been manufactured in the above Indian works based
on technological support of collaborator, type tested (as per IEC/IS
standard) and supplied as on the date of NOA.
b) collaborator shall furnish performance guarantee for an amount of 10% of
the ex-works cost of such equipment(s) and this performance guarantee
shall be in addition to contract performance guarantee to be submitted by
the contractor.
c) The collaborator meets the requirements stipulated in (i) above. A valid
collaboration agreement for technology transfer/license to design,
manufacture, test and supply PLCC panels in India, shall be submitted.
24.19 Technical Requirement of Communication Equipment
The SDH equipment shall be offered from a manufacturer(s) who has been
manufacturing SDH equipments for the last three (3) years and SDH equipment
manufactured by such manufacturer(s) shall have been satisfactory operation in
110kV or higher voltage Power Substations for at least two (2) years as on the date of
NOA.
24.20 Technical Requirement of “Indian Associate” for execution of on shore supply
and services for 765 kV Transformer & Reactor package
Indian associate must have erected at least two (2) or more circuit breaker equipped
bays of 345 kV or above voltage level or at least two (2) nos. of 345 kV or above
voltage class transformer/reactor; during last seven (7) years and above
bays/transformer/reactors must be in satisfactory operation# as on the date of NOA.

____________________________________________________________________________
Technical Specification: GTR Page 34 of 34
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan 2017)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-A
CORONA AND RADIO INTERFERENCE VOLTAGE (RIV) TEST

1. General
Unless otherwise stipulated, all equipment together with its associated connectors,
where applicable, shall be tested for external corona (for 400kV & above) both by
observing the voltage level for the extinction of visible corona under falling power
frequency voltage and by measurement of radio interference voltage (RIV) for 132kV
and above.
2. Test Levels:
The test voltage levels for measurement of external RIV and for corona extinction
voltage are listed under the relevant clauses of the specification.
3. Test Methods for RIV:
3.1 RIV tests shall be made according to measuring circuit as per International Special-
Committee on Radio Interference (CISPR) Publication 16-1(1993) Part -1. The
measuring circuit shall preferably be tuned to frequency with 10% of 0.5 Mhz but
other frequencies in the range of 0.5 MHz to 2 MHz may be used, the measuring
frequency being recorded. The results shall be in microvolts.
3.2 Alternatively, RIV tests shall be carried out in accordance with relevant IEC of
respective equipment or NEMA standard Publication No. 107-1964.
3.3 In measurement of, RIV, temporary additional external corona shielding may be
provided. In measurements of RIV only standard fittings of identical type supplied
with the equipment and a simulation of the connections as used in the actual
installation will be permitted in the vicinity within 3.5 meters of terminals.
3.4 Ambient noise shall be measured before and after each series of tests to ensure that
there is no variation in ambient noise level. If variation is present, the lowest ambient
noise level will form basis for the measurements. RIV levels shall be measured at
increasing and decreasing voltages of 85%, 100%, and 110% of the specified RIV test
voltage for all equipment unless otherwise specified. The specified RIV test voltage for
765kV, 400 kV, 220 KV is listed in the detailed specification together with maximum
permissible RIV level in microvolts.
3.5 The metering instruments shall be as per CISPR recommendation or equivalent device
so long as it has been used by other testing authorities.
3.6 The RIV measurement may be made with a noise meter. A calibration procedure of the
frequency to which noise meter shall be tuned shall establish the ratio of voltage at the
high voltage terminal to voltage read by noise meter.
4. Test Methods for Visible Corona
The purpose of this test is to determine the corona extinction voltage of apparatus,
connectors etc. The test shall be carried out in the same manner as RIV test described
above with the exception that RIV measurements are not required during test and a
search technique shall be used near the onset and extinction voltage, when the test
voltage is raised and lowered to determine their precise values. The test voltage shall
be raised to 110% of specified corona extinction voltage and maintained there for five
minutes. In case corona inception does not take place at 110%, test shall be stopped,
otherwise test shall be continued and the voltage will then be decreased slowly until
____________________________________________________________________________
Technical Specification: GTR Page 1 of 2 (Annexure-A)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-A
all visible corona disappears. The procedure shall be repeated at least 4 times with
corona inception and extinction voltage recorded each time. The corona extinction
voltage for purposes of determining compliance with the specification shall be the
lowest of the four values at which visible corona (negative or positive polarity)
disappears. Photographs with laboratory in complete darkness shall be taken under
test conditions, at all voltage steps i.e. 85%, 100%, and 110%. Additional photographs
shall be taken at corona inception and extinction voltages. At least two views shall be
photographed in each case using Panchromatic film with an ASA daylight rating of 400
with an exposure of two minutes at a lens aperture of f/5.6 or equivalent. The
photographic process shall be such that prints are available for inspection and
comparison with conditions as determined from direct observation. Photographs shall
be taken from above and below the level of connector so as to show corona on
bushing, insulators and all parts of energised connectors. The photographs shall be
framed such that test object essentially, fills the frame with no cut-off.
For recording purpose, modern devices utilizing UV recording methods such as image
intensifier may also be used.

4.1 The test shall be recorded on each photograph. Additional photograph shall be taken
from each camera position with lights on to show the relative position of test object to
facilitate precise corona location from the photographic evidence.
4.2 In addition to photographs of the test object preferably four photographs shall be
taken of the complete test assembly showing relative positions of all the test
equipment and test objects. These four photographs shall be taken from four points
equally spaced around the test arrangement to show its features from all sides.
Drawings of the laboratory and test set up locations shall be provided to indicate
camera positions and angles. The precise location of camera shall be approved by
Employer’s inspector, after determining the best camera locations by trial energisation
of test object at a voltage which results in corona.
4.3 The test to determine the visible corona extinction voltage need not be carried out
simultaneously with test to determine RIV levels.
4.4 However, both test shall be carried out with the same test set up and as little time
duration between tests as possible. No modification on treatment of the sample
between tests will be allowed. Simultaneous RIV and visible corona extinction voltage
testing may be permitted at the discretion of Employer’s inspector if, in his opinion, it
will not prejudice other test.
5. Test Records:
In addition to the information previously mentioned and the requirements specified as
per CISPR or NEMA 107-1964 the following data shall be included in test report:
a) Background noise before and after test.
b) Detailed procedure of application of test voltage.
c) Measurements of RIV levels expressed in micro volts at each level.
d) Results and observations with regard to location and type of interference
sources detected at each step.
e) Test voltage shall be recorded when measured RIV passes through 100
microvolts in each direction.
f)Onset and extinction of visual corona for each of the four tests required shall be
recorded.
____________________________________________________________________________
Technical Specification: GTR Page 2 of 2 (Annexure-A)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-B

SEISMIC WITHSTAND TEST PROCEDURE

The seismic withstanding test on the complete equipment (for 132kV and above) shall be
carried out alongwith supporting structure.
The Bidder shall arrange to transport the structure from his Contractor’s premises/
POWERGRID sites for the purpose of seismic withstand test only.
The seismic level specified shall be applied at the base of the structure. The accelerometers
shall be provided at the Terminal Pad of the equipment and any other point as agreed by
the Employer. The seismic test shall be carried out in all possible combinations of the
equipment. The seismic test procedure shall be furnished for approval of the Employer.
The frequency range for the earthquake spectra shall be as per IEC–6227-300.

____________________________________________________________________________________________
Technical Specification: GTR Page 1 of 1 (Annexure-B)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

LIST OF GENERAL STANDARDS AND CODES

CODES TITLE
-- India Electricity Rules
-- Indian Electricity Act
-- Indian Electricity (Supply) Act
-- Indian Factories Act
IS-5 Colors for Ready Mixed Paints and Enamels
IS-335 New Insulating Oils
IS-617 Aluminium and Aluminium Alloy Ingots and Castings for General
Engineering Purposes
IS-1448 (P1 to P 145) Methods of Test for Petroleum and its Products
IS-2071 (P1 to P3) Methods of High Voltage Testing
IS-12063 Classification of degrees of protection provided by enclosures of
electrical equipment
IS-2165 ; P1:1997, Insulation Coordination
P2:1983
IS-3043 Code of Practice for Earthing
IS-6103 Method of Test for Specific Resistance (Resistivity) of Electrical
Insulating Liquids
IS-6104 Method of Test for Interfacial Tension of Oil against Water by the
Ring Method
IS-6262 Method of test for Power factor & Dielectric Constant of Electrical
Insulating Liquids
IS-6792 Method for determination of electric strength of insulating oils
IS-5578 Guide for marking of insulated conductors
IS-11353 Guide for uniform system of marking & identification of
conductors & apparatus terminals.
IS-8263 Methods for Radio Interference Test on High voltage Insulators
IS-9224 (Part 1,2&4) Low Voltage Fuses
IEC-60060 (Part 1 to P4) High Voltage Test Techniques
IEC 60068 Environmental Test
IEC-60117 Graphical Symbols
IEC-60156 Method for the Determination of the Electrical Strength of
Insulation Oils
IEC-60270 Partial Discharge Measurements
IEC-60376 Specification and Acceptance of New Sulphur Hexafloride
IEC-60437 Radio Interference Test on High Voltage Insulators
IEC-60507 Artificial Pollution Tests on High Voltage Insulators to be used on
AC Systems
IEC-62271-1 Common Specification for High Voltage Switchgear & Control
gear Standards
IEC-60815 Guide for the Selection of Insulators in respect of Polluted
Conditions
____________________________________________________________________________
Technical Specification: GTR Page 1 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IEC-60865 (P1 & P2) Short Circuit Current - Calculation of effects
ANSI-C.1/NFPA.70 National Electrical Code
ANSI-C37.90A Guide for Surge Withstand Capability (SWC) Tests
ANSI-C63.21, C63.3 Specification for Electromagnetic Noise and Field Strength
Instrumentation 10 KHz to 1 GHZ
C36.4ANSI-C68.1 Techniquest for Dielectric Tests
ANSI-C76.1/EEE21 Standard General Requirements and Test Procedure for Outdoor
Apparatus Bushings
ANSI-SI-4 Specification for Sound Level Meters
ANSI-Y32-2/C337.2 Drawing Symbols
ANSI-Z55.11 Gray Finishes for Industrial Apparatus and Equipment No. 61
Light Gray
NEMA-107T Methods of Measurements of RIV of High Voltage Apparatus
NEMA-ICS-II General Standards for Industrial Control and Systems Part ICSI-
109
CISPR-1 Specification for CISPR Radio Interference Measuring Apparatus
for the frequency range 0.15 MHz to 30 MHz
CSA-Z299.1-1978h Quality Assurance Program Requirements
CSA-Z299.2-1979h Quality Control Program Requirements
CSA-Z299.3-1979h Quality Verification Program Requirements
CSA-Z299.4-1979h Inspection Program Requirements
TRANSFORMERS AND REACTORS
IS:10028 (Part 2 & 3) Code of practice for selection, installation & maintenance of
Transformers (P1:1993), (P2:1991), (P3:1991)
IS-2026 (P1 to P4) Power Transformers
IS-3347 (part 1 to Part 8) Dimensions for Porcelain transformer Bushings for use in lightly
polluted atmospheres
IS-3639 Fittings and Accessories for Power Transformers
IS-6600 Guide for Loading of oil immersed Transformers
IEC-60076 (Part 1 to 5) Power Transformers
IEC-60214 On-Load Tap-Changers
IEC-60289 Reactors
IEC- 60354 Loading Guide for Oil - Immersed power transformers
IEC-60076-10 Determination of Transformer and Reactor Sound Levels
ANSI-C571280 General requirements for Distribution, Power and Regulating
Transformers
ANSI-C571290 Test Code for Distribution, Power and Regulation Transformers
ANSI-C5716 Terminology & Test Code for Current Limiting Reactors
ANSI-C5721 Requirements, Terminology and Test Code for Shunt Reactors
Rated Over 500 KVA
ANSI-C5792 Guide for Loading Oil-Immersed Power Transformers upto and
including 100 MVA with 55 deg C or 65 deg C Winding Rise

____________________________________________________________________________
Technical Specification: GTR Page 2 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
ANSI-CG,1EEE-4 Standard Techniques for High Voltage Testing
IEC 60076 Power transformers
IEC 60076-1 Part 1: General
IEC 60076-2 Part 2: Temperature rise
IEC 60076-3 Part 3: Insulation levels, dielectric tests and external clearances
in air
IEC 60076-4 Part 4: Guide to the lightning impulse and switching impulse
testing - Power transformers and reactors
IEC 60076-3-1 Part 3-1: Insulation Levels and Dielectric Tests –External
Clearances in Air
IEC 60076-5 Part 5: Ability to withstand short circuit
IEC 60076-6 Part 6: Reactors
IEC 60076-7 Part 7: Loading guide for oil-immersed power transformers
IEC 60076-8 Part 8: Application guide
IEC 60076-10 Part 10: Determination of sound levels
IEC 60076-10-1 Part 10-1: Determination of sound levels - Application guide
IEC 60076-11 Part 11: Dry-type transformers
IEC 60076-12 Part 12: Loading guide for dry-type power transformers
IEC 60076-13 Part 13: Self-protected liquid-filled transformers
IEC 60076-14 Part 14: Design and application of liquid-immersed power
transformers using high-temperature insulation materials
IEC 60076-15 Part 15: Gas-filled power transformers
IEC 60076-16 Part 16: Transformers for wind turbine applications
IEC 60076-18 Part 18: Measurement of frequency response
IEC 60076-19 Part 19: Rules for the determination of uncertainties in the
measurement of losses in power transformers and reactors
IEC 60076-21 Part 21: Standard requirements, terminology, and test code for
step-voltage regulators
IEC 60044, BS 3938 Current transformers
IEC 60050 International Electrotechnical Vocabulary
IEC 60050(421) International Electrotechnical vocabulary- Chapter 421 : Power
Transformers and Reactors
IEC 60060 High Voltage test techniques
IEC 60060-1 General definitions and test requirements
IEC 60060-2 Measuring systems
IEC 60071 Insulation co-ordination
IEC 60071-1 Part 1: Definitions, principles and rules
IEC 60071-2 Part 2 : Application guide
IEC 60137 Bushing for alternating voltage above 1000V
IEC 60214 On-Load Tap changers
IEC 255-21-3 Relays vibration

____________________________________________________________________________
Technical Specification: GTR Page 3 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IEC 60270 Partial discharge measurements
IEC 60296 Specification for Unused Mineral Oil for Transformers and
Switchgear
IEC 60422 Supervision and Maintenance guide for Mineral Insulating Oil in
Electrical Equipment
IEC 60475 Method of Sampling Liquid dielectrics
IEC 60529 Classification of Degrees of Protection provided by Enclosures
IEC 60542 Application Guide for On-Load Tap-Changers
IEC 60567 Guide for the Sampling of Gases and of Oil from Oil-filled
Electrical Equipment for the Analysis of Free and Dissolved Gases
IEC 60651 Sound Level Meters
IEC 61083 Digital Recorders and Software for High Voltage Impulse testing
IEC 61083-1 Part 1: Requirements for digital recorders in high voltage impulse
tests
IEC 61083-2 Part 2: Evaluation of software used for the determination of the
parameters of impulse waveforms
CISPR 16 Specification for radio disturbance and immunity measuring
apparatus
CISPR 16-1 Radio disturbance and immunity measuring apparatus
CISPR-18 Radio Interference Characteristics of Power Lines and High
Voltage Equipment
ISO 9001 Quality system-Model for Quality Assurance in Design
/development
Cigre Publication 202 Guidelines for conducting design reviews for transformers 100
MVA and 123 kV and above. August 2002-Cigre Working Group
12.22
WG 12-15 Guide for Customers Specifications for Transformers 100 MVA
and 123 kV and above
WG 12 19 Short Circuit Performance of Transformers.
BS-4360 Specification for weldable structural steel
BS-5135 Specification for arc welding of carbon and carbon manganese
steels
BS-5500 Specification for unfired fusion welded pressure vessels
IS-3618 Specification for phosphate treatment of iron & steel for
protection against corrosion
IS-6005 Code of practice for phosphating of Iron and Steel
ISO-8501 Preparation of steel surface before application of Paints and
related product
IEC-60599 Mineral oil impregnated electrical equipment in service – guide
to the interpretation of dissolved and free gases analysis
IS-10593 Method of evaluating the analysis of gases in oil filled electrical
equipment in service
IS-2099 Bushings for alternating voltages above 1000 volts

____________________________________________________________________________
Technical Specification: GTR Page 4 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IS-3347 Part I to 8 Dimension for porcelain transformer bushing
DIN-42530 Bushing up to 1000kV from 250A-5000A for liquid filled
Transformer
IS-2026 Part 1 to 5 Power transformer
IS-4691 Degrees of protection provided by enclosure for rotating
electrical machinery
IEC-60034-5 Degrees of protection provided by integral design of rotating
electrical machines(IP Code) classification
IS:325 / IEC -60034 Performance of cooling fan / oil pump motor
IS-13947 part 1 to 5 Specification for low voltage switchgear and control gear
IS:3400 Methods of test for vulcanised rubber
IS:7016 part 1 to 14 Methods of test for coated and treated fabrics
IS:803 Code of practice for design, fabrication and erection of vertical
mild steel cylindrical welded oil storage tanks.
IS:3637 Gas operated Relays
IS:335 New Insulating oils – Specification
IEC-62271-203 Gas insulated metal enclosed switchgear for rated voltage above
52kV
IEC-61639 Direct connection between power transformers and gas-
insulated metal enclosed switchgear for rated voltages of 52.5 kV
and above.
IS:3400 / BS 903 / Air cell ( Flexible Air Separator)
IS:7016
IEC 60529 / IP : 55 Degree of protection for cooler control cabinet , MOLG, Cooling
fan , oil pump, Buchholz Relay
IEC 60529 / IP : 56 Degree of protection for Pressure Relief Device
IEC 60529 / IP : 43 Degree of protection for Remote tap Changer cubicle (RTCC)

CIRCUIT BREAKERS
IEC-62271-100 High-voltage switchgear and control gear - Part 100: Alternating
current circuit-breakers
IEC-62271-101 High-voltage switchgear and control gear - Part 101: Synthetic
testing
IEC-62155 Hollow pressurized and unpressurized ceramic and glass
insulators for use in electrical equipment with rated voltages
greater than 1000 V
IEC-62271-110 High-voltage switchgear and control gear - Part 110: Inductive
load switching
IEC-62271-109 High-voltage switchgear and control gear - Part 110: Inductive
load switching
CURRENT TRANSFORMERS, VOLTAGE TRANSFORMERS AND COUPLING CAPACITOR
VOLTAGE TRANSFORMERS
IS-2705- (P1 to P4) Current Transformers

____________________________________________________________________________
Technical Specification: GTR Page 5 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IS:3156- (P1 to P4) Voltage Transformers
IS-4379 Identification of the Contents of Industrial Gas Cylinders
IEC-61869 (Part-1) Instrument transformers - Part 1: General requirements
IEC-61869 (Part-2) Instrument transformers - Part 2: Additional requirements for
current transformers
IEC-61869 (Part-3) Instrument transformers - Part 3: Additional requirements for
inductive voltage transformers
IEC-61869 (Part-4) Instrument transformers - Part 4: Additional requirements for
combined transformers
IEC-61869 (Part-5) Instrument transformers - Part 5: Additional requirements for
capacitor voltage transformers
IEC-61869 (Part-6) Instrument transformers - Part 6: Additional general
requirements for low-power instrument transformers
IEC-61869 (Part-9) Instrument transformers - Part 9: Digital interface for instrument
transformers
IEC-61869 (Part-102) Instrument transformers - Part 102: Ferroresonance oscillations
in substations with inductive voltage transformers
IEC-61869 (Part-103) Instrument transformers - The use of instrument transformers
for power quality measurement
BUSHING
IS-2099 Bushings for Alternating Voltages above 1000V
IEC-60137 Insulated Bushings for Alternating Voltages
above 1000V
SURGE ARRESTERS
IS-3070 (PART2) Lightning arresters for alternating current systems : Metal oxide
lightning arrestors without gaps
IEC-60099-4 Metal oxide surge arrestors without gaps
IEC-60099-5 Selection and application recommendation
ANSI-C62.1 IEE Standards for S A for AC Power Circuits
NEMA-LA 1 Surge Arresters
CUBICLES AND PANELS & OTHER RELATED EQUIPMENTS
IS-722, IS-1248 Electrical relays for power system
IS-3231, 3231 (P-3) Protection
IS:5039 Distributed pillars for Voltages not Exceeding 1000 Volts
IEC-60068.2.2 Basic environmental testing procedures Part 2: Test B: Dry heat
IEC-60529 Degree of Protection provided by enclosures
IEC-60947-4-1 Low voltage switchgear and control gear
IEC-61095 Electromechanical Contactors for household and similar
purposes
IEC-60439 (P1 & 2) Low Voltage Switchgear and control gear assemblies
ANSI-C37.20 Switchgear Assemblies, including metal enclosed bus
ANSI-C37.50 Test Procedures for Low Voltage Alternating Current Power

____________________________________________________________________________
Technical Specification: GTR Page 6 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
Circuit Breakers
ANSI-C39 Electric Measuring instrument
ANSI-C83 Components for Electric Equipment
IS: 8623: (Part I to 3) Specification for Switchgear & Control Assemblies
NEMA-AB Moulded Case Circuit and Systems
NEMA-CS Industrial Controls and Systems
NEMA-PB-1 Panel Boards
NEMA-SG-5 Low voltage Power Circuit breakers
NEMA-SG-3 Power Switchgear Assemblies
NEMA-SG-6 Power switching Equipment
NEMA-5E-3 Motor Control Centers
1248 (P1 to P9) Direct acting indicating analogue electrical measuring
instruments & their accessories
Disconnecting switches
IEC-62271-102 High-voltage switchgear and control gear - Part 102: Alternating
current disconnectors and earthing switches
IEC-60265 (Part 1 & 2) High Voltage switches
ANSI-C37.32 Schedule of preferred Ratings, Manufacturing Specifications and
Application Guide for high voltage Air Switches, Bus supports and
switch accessories
ANSI-C37.34 Test Code for high voltage air switches
NEMA-SG6 Power switching equipment
PLCC and line traps
IS-8792 Line traps for AC power system
IS-8793 Methods of tests for line traps
IS-8997 Coupling devices for PLC systems
IS-8998 Methods of test for coupling devices for PLC systems
IEC-60353 Line traps for A.C. power systems
IEC-60481 Coupling Devices for power line carrier systems
IEC-60495 Single sideboard power line carrier terminals
IEC-60683 Planning of (single Side-Band) power line carrier systems
CIGRE Teleprotection report by Committee 34 & 35
CIGRE Guide on power line carrier 1979
CCIR International Radio Consultative Committee
CCITT International Telegraph & Telephone Consultative Committee
EIA Electric Industries Association
Protection and control equipment
IEC-60051: (P1 to P9) Recommendations for Direct Acting indicating analogue electrical
measuring instruments and their accessories
IEC-60255 (Part 1 to 23) Electrical relays
IEC-60297 (P1 to P4) Dimensions of mechanical structures of the 482.6mm (19 inches)

____________________________________________________________________________
Technical Specification: GTR Page 7 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
series
IEC-60359 Expression of the performance of electrical & electronic
measuring equipment
IEC-60387 Symbols for Alternating-Current Electricity meters
IEC-60447 Man machine interface (MMI) - Actuating principles
IEC-60521 Class 0.5, 1 and 2 alternating current watt hour metres
IEC-60547 Modular plug-in Unit and standard 19-inch rack mounting unit
based on NIM Standard (for electronic nuclear instruments)
ANSI-81 Screw threads
ANSI-B18 Bolts and Nuts
ANSI-C37.1 Relays, Station Controls etc
ANSI-C37.2 Manual and automatic station control, supervisory and
associated telemetering equipment
ANSI-C37.2 Relays and relay systems associated with electric power
apparatus
ANSI-C39.1 Requirements for electrical analog indicating instruments
MOTORS
IS-325 Three phase induction motors
IS-4691 Degree of protection provided by enclosure for rotating electrical
machinery
IEC-60034 (P1 to P19:) Rotating electrical machines
IEC-Document 2 Three phase induction motors
(Central Office) Motors and Generators
NEMA-MGI
Electronic equipment and components
MIL-21B, MIL-833 Environmental testing
& MIL-2750
EC-60068 (P1 to P5) Printed boards
IEC-60326 (P1 to P2) Material and workmanship standards
IS-1363 (P1 to P3) Hexagon head bolts, screws and nuts of product grade C
IS-1364 (P1 to P5) Hexagon head bolts, screws and nuts of products grades A and B
IS-3138 Hexagonal Bolts and Nuts (M42 to M150)
ISO-898 Fasteners: Bolts, screws and studs
ASTM Specification and tests for materials
Clamps & connectors
IS-5561 Electric power connectors
NEMA-CC1 Electric Power connectors for sub station
NEMA-CC 3 Connectors for Use between aluminium or aluminum-Copper
Overhead Conductors
Bus hardware and insulators
IS: 2121 Fittings for Aluminum and steel cored Al conductors for overhead

____________________________________________________________________________
Technical Specification: GTR Page 8 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
power lines
IS-731 Porcelain insulators for overhead power lines with a nominal
voltage greater than 1000 V
IS-2486 (P1 to P4) Insulator fittings for overhead power lines with a nominal
voltage greater than 1000 V
IEC-60120 Dimensions of Ball and Socket Couplings of string insulator units
IEC-60137 Insulated bushings for alternating voltages above 1000 V
IEC-60168 Tests on indoor and outdoor post insulators of ceramic material
or glass for Systems with Nominal Voltages Greater than 1000 V
IEC-62155 Hollow pressurized and unpressurized ceramic and glass
insulators for use in electrical equipment with rated voltages
greater than 1 000 V
IEC-60273 Characteristics of indoor and outdoor post insulators for systems
with nominal voltages greater than 1000V
IEC-61462 Pressurized and un-pressurized insulator for use in electrical
equipment with rated voltage greater than 1000V – Definitions,
Test methods, acceptance criteria and design recommendations
IEC-60305 Insulators for overhead lines with nominal voltage above 1000V-
ceramic or glass insulator units for ac systems Characteristics of
String Insulator Units of the cap and pin type
IEC-60372 (1984) Locking devices for ball and socket couplings of string insulator
units : dimensions and tests
IEC-60383 (P1 and P2) Insulators for overhead lines with a nominal voltage above 1000
V
IEC-60433 Characteristics of string insulator units of the long rod type
IEC-60471 Dimensions of Clevis and tongue couplings of string insulator
units
ANSI-C29 Wet process porcelain insulators
ANSI-C29.1 Test methods for electrical power insulators
ANSI-C92.2 For insulators, wet-process porcelain and toughened glass
suspension type
ANSI-C29.8 For wet-process porcelain insulators apparatus, post-type
ANSI-G.8 Iron and steel hardware
CISPR-7B Recommendations of the CISPR, tolerances of form and of
Position, Part 1
ASTM A-153 Zinc Coating (Hot-Dip) on iron and steel hardware

Strain and rigid bus-conductor

IS-2678 Dimensions & tolerances for Wrought Aluminum and Aluminum
Alloys drawn round tube
IS-5082 Wrought Aluminum and Aluminum Alloy Bars. Rods, Tubes and
Sections for Electrical purposes
ASTM-B 230-82 Aluminum 1350 H19 Wire for electrical purposes

____________________________________________________________________________
Technical Specification: GTR Page 9 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
ASTM-B 231-81 Concentric - lay - stranded, aluminum 1350 conductors
ASTM-B 221 Aluminum - Alloy extruded bar, road, wire, shape
ASTM-B 236-83 Aluminum bars for electrical purpose (Bus-bars)
ASTM-B 317-83 Aluminum-Alloy extruded bar, rod, pipe and structural shapes for
electrical purposes (Bus Conductors)

Batteries
IS:1651 Stationary Cells and Batteries, Lead-Acid Type (with Tubular
Positive Plates)
IS:1652 Stationary Cells and Batteries, Lead-Acid Type (with Plante
Positive Plates)
IS:1146 Rubber and Plastic Containers for Lead-Acid Storage Batteries
IS:6071 Synthetic Separators for Lead-Acid Batteries
IS:266 Specification for Sulphuric Acid
IS:1069 Specification for Water for Storage Batteries
IS:3116 Specification for Sealing Compound for Lead-Acid Batteries
IS:1248 Indicating Instruments
IS:10918 Vented type nickel Cadmium Batteries
IEC:60896-21&22 Lead Acid Batteries Valve Regulated types – Methods of Tests &
Requirements
IEC: 60623 Vented type nickel Cadmium Batteries
IEC:60622 Secondary Cells & Batteries – Sealed Ni-Cd rechargeable single
cell
IEC:60623 Secondary Cells & Batteries – Vented Ni-Cd rechargeable single
cell
IEC:60896-11 Stationary Lead Acid Batteries – Vented Type – General
requirements & method of tests
IEEE-485 Recommended practices for sizing of Lead Acid Batteries
IEEE-1115 Sizing of Ni-Cd Batteries
IEEE-1187 Recommended practices for design & installation of VRLA
Batteries
IEEE-1188 Recommended practices for design & installation of VRLA
Batteries
IEEE-1189 Guide for selection of VRLA Batteries

Battery Charger
IS:3895 Mono-crystalline Semiconductor Rectifier Cells and Stacks
IS:4540 Mono-crystalline Semiconductor Rectifier Assemblies and
Equipment
IS:6619 Safety Code for Semiconductor Rectifier Equipment
IS:2026 Power Transformers
IS:2959 AC Contactors for Voltages not Exceeding 1000 Volts

____________________________________________________________________________
Technical Specification: GTR Page 10 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IS:1248 Indicating Instruments
IS:2208 HRC Fuses
IS:13947 (Part-3) Air break switches, air break disconnectors & fuse combination
units for voltage not exceeding 1000V AC or 1200V DC
IS:2147 Degree of protection provided by enclosures for low voltage
switchgear and control gear
IS:6005 Code of practice for phosphating of Iron and Steel
IS:3231 Electrical relays for power system protection
IS:3842 Electrical relay for AC Systems
IS:5 Colours for ready mix paint
IEEE-484 Recommended Design for installation design and installation of
large lead storage batteries for generating stations and
substations
IEEE-485 Sizing large lead storage batteries for generating stations and
substations
Wires and cables
ASTMD-2863 Measuring the minimum oxygen concentration to support candle
like combustion of plastics (oxygen index)
IS-694 PVC insulated cables for working voltages upto and including
1100 Volts
IS-1255 Code of practice for installation and maintenance of power
cables, upto and including 33 kV rating
IS-1554 (P1 and P2) PVC insulated (heavy duty) electric cables (part 1) for working
voltage upto and including 1100 V
Part (2) for working voltage from 3.3 kV upto and including 11kV
IS:1753 Aluminium conductor for insulated cables
IS:2982 Copper Conductor in insulated cables
IS-3961 (P1 to P5) Recommended current ratings for cables
IS-3975 Mild steel wires, formed wires and tapes for armouring of cables
IS-5831 PVC insulating and sheath of electric cables
IS-6380 Elastometric insulating and sheath of electric cables
IS-7098 Cross linked polyethylene insulated PVC sheathed cables for
working voltage upto and including 1100 volts
IS-7098 Cross-linked polyethyle insulated PVC sheathed cables for
working voltage from 3.3kV upto and including 33 kV
IS-8130 Conductors for insulated electrical cables and flexible cords
IS-1753 Aluminum Conductors for insulated cables
IS-10418 Specification for drums for electric cables
IEC-60096 (part 0 to p4) Radio Frequency cables
IEC-60183 Guide to the Selection of High Voltage Cables
IEC-60189 (P1 to P7) Low frequency cables and wires with PVC insulation and PVC
sheath

____________________________________________________________________________
Technical Specification: GTR Page 11 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IEC-60227 (P1 to P7) Polyvinyl Chloride insulated cables of rated voltages up to and
including 450/750V
IEC-60228 Conductors of insulated cables
IEC-60230 Impulse tests on cables and their accessories
IEC-60287 (P1 to P3) Calculation of the continuous current rating of cables (100% load
factor)
IEC-60304 Standard colours for insulation for low-frequency cables and
wires
IEC-60331 Fire resisting characteristics of Electric cables
IEC-60332 (P1 to P3) Tests on electric cables under fire conditions
IEC-60502 Extruded solid dielectric insulated power cables for rated
voltages from 1 kV upto to 30 kV
IEC-754 (P1 and P2) Tests on gases evolved during combustion of electric cables
AIR conditioning and ventilation
IS-659 Safety code for air conditioning
IS-660 Safety code for Mechanical Refrigeration
ARI:520 Standard for Positive Displacement Refrigeration Compressor
and Condensing Units
IS:4503 Shell and tube type heat exchanger
ASHRAE-24 Method of testing for rating of liquid coolers
ANSI-B-31.5 Refrigeration Piping
IS:2062 Steel for general structural purposes
IS:655 Specification for Metal Air Dust
IS:277 Specification for Galvanised Steel Sheets
IS-737 Specification for Wrought Aluminium and Aluminium Sheet &
Strip
IS-1079 Hot rolled cast steel sheet & strip
IS-3588 Specification for Electrical Axial Flow Fans
IS-2312 Propeller Type AC Ventilation Fans
BS-848 Methods of Performance Test for Fans
BS-6540 Part-I Air Filters used in Air Conditioning and General Ventilation
BS-3928 Sodium Flame Test for Air Filters (Other than for Air Supply to
I.C. Engines and Compressors)
US-PED-2098 Method of cold DOP & hot DOP test
MIL-STD-282 DOP smoke penetration method
ASHRAE-52 Air cleaning device used in general ventilation for removing
particle matter
IS:3069 Glossary of Terms, Symbols and Units Relating to Thermal
Insulation Materials
IS:4671 Expanded Polystyrene for Thermal Insulation Purposes
IS:8183 Bonded Mineral Wool
IS:3346 Evaluation of Thermal Conductivity properties by means of

____________________________________________________________________________
Technical Specification: GTR Page 12 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
guarded hot plate method
ASTM-C-591-69 Standard specification for rigid preformed cellular urethane
thermal insulation
IS:4894 Centrifugal Fans
BS:848 Method of Performance Test for Centrifugal Fans
IS:325 Induction motors, three-phase
IS:4722 Rotating electrical machines
IS:1231 Three phase foot mounted Induction motors, dimensions of
IS:2233 Designations of types of construction and mounting
arrangements of rotating electrical machines
IS:2254 Vertical shaft motors for pumps, dimensions of
IS:7816 Guide for testing insulation resistance of rotating machines
IS:4029 Guide for testing three phase induction motors
IS: 4729 Rotating electrical machines, vibration of, Measurement and
evaluation of
IS:4691 Degree of protection provided by enclosures for rotating
electrical machinery
IS:7572 Guide for testing single-phase ac motors
IS:2148 Flame proof enclosure for electrical apparatus
BS:4999(Part-51) Noise levels
Galvanizing
IS-209 Zinc Ingot
IS-2629 Recommended Practice for Hot-Dip galvanizing on iron and steel
IS-2633 Methods for testing uniformity of coating of zinc coated articles
ASTM-A-123 Specification for zinc (Hot Galavanizing) Coatings, on products
Fabricated from rolled, pressed and forged steel shapes, plates,
bars and strips
ASTM-A-121-77 Zinc-coated (Galvanized) steel barbed wire
Painting
IS-6005 Code of practice for phosphating of iron and steel
ANSI-Z551 Gray finishes for industrial apparatus and equipment
SSPEC Steel structure painting council
Fire protection system
-- Fire protection manual issued by tariff advisory committee (TAC)
of India
HORIZONTAL CENTRIFUGAL PUMPS
IS:1520 Horizontal centrifugal pumps for clear, cold and fresh water
IS:9137 Code for acceptance test for centrifugal & axial pumps
IS:5120 Technical requirement – Rotodynamic special purpose pumps
API-610 Centrifugal pumps for general services
Hydraulic Institutes Standards

____________________________________________________________________________
Technical Specification: GTR Page 13 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
BS:599 Methods of testing pumps
PTC-8.2 Power Test Codes - Centrifugal pumps
DIESEL ENGINES
IS:10000 Methods of tests for internal combustion engines
IS:10002 Specification for performance requirements for constant speed
compression ignition engines for general purposes (above 20
kW)
BS:5514 The performance of reciprocating compression ignition (Diesel)
engines, utilizing liquid fuel only, for general purposes
ISO:3046 Reciprocating internal combustion engines performance
IS:554 Dimensions for pipe threads where pressure tight joints are
required on threads
ASME Power Test Code Internal combustion engine PTC-17
-- Codes of Diesel Engine Manufacturer’s Association, USA
PIPING VALVES & SPECIALITIES
IS:636 Non percolating flexible fire-fighting delivery hose
IS:638 Sheet rubber jointing and rubber inserting jointing
IS:778 Gun metal gate, globe and check valves for general purpose
IS:780 Sluice valves for water works purposes (50 to 300 mm)
IS:901 Couplings, double male and double female instantaneous pattern
for fire fighting
IS:902 Suction hose couplings for fire-fighting purposes
IS:903 Fire hose delivery couplings branch pipe nozzles and nozzle
spanner
IS:1538 Cast iron fittings for pressure pipes for water, gas and sewage
IS:1903 Ball valve (horizontal plunger type) including floats for water
supply purposes
IS:2062 SP for weldable structural steel
IS:2379 Colour Code for the identification of pipelines
IS:2643 Dimensions of pipe threads for fastening purposes
IS:2685 Code of Practice for selection, installation and maintenance of
sluice valves
IS:2906 Sluice valves for water-works purposes (350 to 1200 mm size)
IS:3582 Basket strainers for fire-fighting purposes (cylindrical type)
IS:3589 Electrically welded steel pipes for water, gas and sewage (150 to
2000 mm nominal diameter)
IS:4038 Foot valves for water works purposes
IS:4927 Unlined flax canvas hose for fire fighting
IS:5290 Landing valves (internal hydrant)
IS:5312 (Part-I) Swing check type reflex (non-return) valves
IS:5306 Code of practice for fire extinguishing installations and
equipment on premises

____________________________________________________________________________
Technical Specification: GTR Page 14 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
Part-I Hydrant systems, hose reels and foam inlets
Part-II Sprinkler systems
BS:5150 Specification for cast iron gate valves
MOTORS & ANNUNCIATION PANELS
IS:325 Three phase induction motors
IS:900 Code of practice for installation and maintenance of induction
motors
IS:996 Single phase small AC and universal electric motors
IS:1231 Dimensions of three phase foot mounted induction motors
IS:2148 Flame proof enclosure of electrical apparatus
IS:2223 Dimensions of flange mounted AC induction motors
IS:2253 Designations for types of construction and mounting
arrangements of rotating electrical machines
IS:2254 Dimensions of vertical shaft motors for pumps
IS:3202 Code of practice for climate proofing of electrical equipment
IS:4029 Guide for testing three phase induction motors
IS:4691 Degree of protection provided by enclosure for rotating electrical
machinery
IS:4722 Rotating electrical machines
IS:4729 Measurement and evaluation of vibration of rotating electrical
machines
IS:5572 Classification of hazardous areas for electrical
(Part-I) installations (Areas having gases and vapours)
IS:6362 Designation of methods of cooling for rotating electrical
machines
IS:6381 Construction and testing of electrical apparatus with type of
protection ‘e’
IS:7816 Guide for testing insulation for rotating machine
IS:4064 Air break switches
IEC DOCUMENT 2 Three Phase Induction Motor
(Control Office) 432
VDE 0530 Part I/66 Three Phase Induction Motor
IS:9224 (Part-II) HRC Fuses
IS:6875 Push Button and Control Switches
IS:694 PVC Insulated cables
IS:1248 Indicating instruments
IS:375 Auxiliary wiring & busbar markings
IS:2147 Degree of protection
IS:5 Colour Relay and timers
IS:2959 Contactors
PG Test Procedures

____________________________________________________________________________
Technical Specification: GTR Page 15 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
NFPA-13 Standard for the installation of sprinkler system
NFPA-15 Standard for water spray fixed system for the fire protection
NFPA-12A Standard for Halong 1301 Fire Extinguishing System
NFPA-72E Standard on Automatic Fire Detectors
-- Fire Protection Manual by TAC (Latest Edition)
NFPA-12 Standard on Carbon dioxide extinguisher systems
IS:3034 Fire of industrial building
-- Electrical generating and distributing stations code of practice
IS:2878 CO2 (Carbon dioxide) Type Extinguisher
IS:2171 DC (Dry Chemical Powder) type
IS:940 Pressurised Water Type
D.G. SET
IS:10002 Specification for performance requirements for constant speed
compression ignition (diesel engine) for general purposes
IS:10000 Method of tests for internal combustion engines
IS:4722 Rotating electrical machines-specification
IS:12063 Degree of protection provided by enclosures
IS:12065 Permissible limit of noise levels for rotating electrical machines
-- Indian Explosive Act 1932
Steel structures
IS-228 (1992) Method of Chemical Analysis of pig iron, cast iron and plain
carbon and low alloy steels.
IS-802 (P1 to 3) Code of practice for use of structural steel in overhead
transmission line towers
IS-806 Code of practice for use of steel tubes in general building
construction
IS-808 Dimensions for hot rolled steel beam, column channel and angle
sections
IS-814 Covered electrodes for manual arc welding of carbon of carbon
manganese steel
IS-816 Code of Practice for use of metal arc welding for general
construction in Mild steel
IS-817 Code of practice for training and testing of metal arc welders.
Part 1 : Manual Metal arc welding
IS-875 (P1 to P4) Code of practice for design loads (other than earthquake) for
buildings and structures
IS-1161 Steel tubes for structural purposes
IS-1182 Recommended practice for radiographic examination of fusion
welded butt joints in steel plates
IS-1363 (P1 to P3) Hexagonal head bolts, screws & nuts of products grade C
IS-1364 Hexagon head bolts, screws and nuts of product grades A and B
IS-1367 (P1 to P18) Technical supply condition for threaded steel fasteners

____________________________________________________________________________
Technical Specification: GTR Page 16 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IS-1599 Methods for bend test
IS-1608 Method for tensile testing of steel products
IS-1893 Criteria for earthquake resistant design of structures
IS-1978 Line Pipe
IS-2062 Steel for general structural purposes
IS-2595 Code of practice for Radiographic testing
IS-3063 Single coil rectangular section spring washers for bolts, nuts and
screws
IS-3664 Code of practice for ultrasonic pulse echo testing by contact and
immersion methods
IS-7205 Safety code for erection of structural steel work
IS-9595 Recommendations for metal arc welding of carbon and carbon
manganese steels
ANSI-B18.2.1 Inch series square and Hexagonal bolts and screws
ANSI-B18.2.2 Square and hexagonal nuts
ANSI-G8.14 Round head bolts
ASTM-A6 Specification for General Requirements for rolled steel plates,
shapes, sheet piling and bars of structural use
ASTM-A36 Specifications of structural steel
ASTM-A47 Specification for malleable iron castings
ASTM-A143 Practice for safeguarding against embilement of Hot Galvanized
structural steel products and procedure for detaching
embrilement
ASTM-A242 Specification for high strength low alloy structural steel
ASTM-A283 Specification for low and intermediate tensile strength carbon
steel plates of structural quality
ASTM-A394 Specification for Galvanized steel transmission tower bolts and
nuts
ASTM-441 Specification for High strength low alloy structural manganese
vanadium steel
ASTM-A572 Specification for High strength low alloy colombium-Vanadium
steel of structural quality
AWS D1-0 Code for welding in building construction welding inspection
AWS D1-1 Structural welding code
AISC American institute of steel construction
NEMA-CG1 Manufactured graphite electrodes
Piping and pressure vessels
IS-1239 (Part 1 and 2) Mild steel tubes, tubulars and other wrought steel fittings
IS -3589 Seamless Electrically welded steel pipes for water, gas and
sewage
IS-6392 Steel pipe flanges
ASME Boiler and pressure vessel code

____________________________________________________________________________
Technical Specification: GTR Page 17 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
ASTM-A120 Specification for pipe steel, black and hot dipped, zinc-coated
(Galvanized) welded and seamless steel pipe for ordinary use
ASTM-A53 Specification for pipe, steel, black, and hot-dipped, zinc coated
welded and seamless
ASTM-A106 Seamless carbon steel pipe for high temperature service
ASTM-A284 Low and intermediate tensile strength carbon-silicon steel plates
for machine parts and general construction
ASTM-A234 Pipe fittings of wrought carbon steel and alloy steel for moderate
and elevated temperatures
ASTM-S181 Specification for forgings, carbon steel for general purpose piping
ASTM-A105 Forgings, carbon steel for piping components
ASTM-A307 Carbon steel externally threated standard fasteners
ASTM-A193 Alloy steel and stainless steel bolting materials for high
temperature service
ASTM-A345 Flat rolled electrical steel for magnetic applications
ASTM-A197 Cupola malleable iron
ANSI-B2.1 Pipe threads (Except dry seal)
ANSI-B16.1 Cast iron pipe flangesand glanged fitting. Class 25, 125, 250 and
800
ANSI-B16.1 Malleable iron threaded fittings, class 150 and 300
ANSI-B16.5 Pipe flanges and flanged fittings, steel nickel alloy and other
special alloys
ANSI-B16.9 Factory-made wrought steel butt welding fittings
ANSI-B16.11 Forged steel fittings, socket-welding and threaded
ANSI-B16.14 Ferrous pipe plug, bushings and locknuts with piple threads
ANSI-B16.25 Butt welding ends
ANSI-B18.1.1 Fire hose couplings screw thread
ANSI-B18.2.1 Inch series square and hexagonal bolts and screws
ANSI-B18.2.2 Square and hexagonal nuts
NSI-B18.21.1 Lock washers
ANSI-B18.21.2 Plain washers
ANSI-B31.1 Power piping
ANSI-B36.10 Welded and seamless wrought steel pipe
ANSI-B36.9 Stainless steel pipe
Other civil works standards
IS-269 33 grade ordinary portland cement
IS2721 Galvanized steel chain link fence fabric
IS-278 Galvanized steel barbed wire for fencing
IS-383 Coarse and fine aggregates from natural sources for concrete
IS-432 (P1 and P2) Mild steel and medium tensile steel bars and hard-dawn steel
wire for concrete reinforcement

____________________________________________________________________________
Technical Specification: GTR Page 18 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IS-456 Code of practice for plain and reinforced concrete
IS-516 Method of test for strength of concrete
IS-800 Code of practice for general construction in steel
IS-806 Steel tubes for structural purposes
IS-1172 Basic requirements for water supply, drainage and sanitation
IS-1199 Methods of sampling and analysis of concrete
IS-1566 Hard-dawn steel wire fabric for concrete reinforcement
IS-1742 Code of Practice for Building drainage
IS-1785 Plain hard-drawn steel wire for pre-stressed concrete
IS-1786 High strength deformed Steel Bars and wires for concrete
reinforcement
IS-1811 Methods of sampling Foundry sands
IS-1893 Criteria for earthquake resistant design of structures
IS-2062 Steel for general structural purposes
IS-2064 Selection, installation and maintenance of sanitary appliances-
code of practices
IS-2065 Code of practice for water supply in buildings
IS-2090 High tension steel bars used in pre-stressed concrete
IS-2140 Standard Galvanized steel wire for fencing
IS-2470 (P1 & P2) Code of practice for installation of septic tanks
IS-2514 Concrete vibrating tables
IS-2645 Integral cement waterproofing compounds
IS-3025 (Part 1 to Methods of sampling and test (Physical and chemical) for water
Part 48) and waste water
IS-4091 Code of practice for design and construction of foundations for
transmission line towers and poles
IS-4111 (Part 1 to P5) Code of practice for ancillary structures in sewerage system
IS-4990 Plywood for concrete shuttering work
IS-5600 Sewage and drainage pumps
National building code of India 1970
USBR E12 Earth Manual by United States Department of the interior Bureau
of Reclamation
ASTM-A392-81 Zinc/Coated steel chain link fence fabric
ASTM-D1557-80 test for moisture-density relation of soils using 10-lb (4.5 kg)
rame land 18-in. (457 mm) Drop
ASTM-D1586(1967) Penetration Test and Split-Barrel Sampling of Soils
ASTM-D2049-69 Test Method for Relative Density of Cohesionless Soils
ASTM-D2435 Test method for Unconsolidated, (1982)
Undrained Strengths of Cohesive Soils in Triaxial Compression
BS-5075 Specification for accelerating Part I Admixtures, Retarding
Admixtures and Water Reducing Admixtures

____________________________________________________________________________
Technical Specification: GTR Page 19 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
CPWD Latest CPWD specifications
ACSR MOOSE CONDUCTOR
IS:6745 Methods for Determination of
BS:443-1969 Mass of zinc coating on zinc
coated Iron and Steel Articles
IS:8263 Methods for Radio Interference
IEC:437-1973 Test on High Voltage Insulators
NEMA:107-1964
CISPR
IS:209, BS:3436-1961 Zinc Ingot
IS:398 Part - V Aluminum Conductors for Overhead Transmission Purposes
IEC:209-1966
BS:215(Part-II), Aluminium Conductors galvanized steel reinforced extra high
IEC:209-1966 voltage (400 kV and above)
IS:1778, BS:1559-1949 Reels and Drums for Bare Conductors
IS:1521, ISO/R89-1959 Method for Tensile Testing of steel wire
IS:2629 Recommended practice for Hot dip Galvanising on Iron and Steel
IS:2633 Method for Testing Uniformity of coating of zinc Coated Articles
IS:4826/ Hot dip galvanised coatings on round steel wires
ASTMA-472-729
GALVANISED STEEL EARTHWIRE
IS:1521, ISO/R:89-1959 Method for Tensile Testing of Steel Wire
IS:1778 Reels and Drums for Bare Conductors
IS:2629 Recommended practice for Hot Dip Galvanising on Iron and Steel
IS:2633 Methods for testing Uniformity of Coating of Zinc Coated Articles
IS:4826/ ASTM: Hot dip Galvanised Coatings on Round Steel Wires
A 475-72a
BS:443-1969
IS:6745/ BS:443-1969 Method for Determination of mass of Zinc Coating on Zinc coated
Iron and Steel Articles.
IS:209/ BS:3463-1961 Zinc ingot
IS:398 (Pt. I to P5:1992)/ Aluminum Conductors for overhead transmission purposes
BS:215 (Part-II
Lighting Fixtures and Accessories
IS:1913 General and safety requirements for electric lighting fittings
IS:3528 Water proof electric lighting fittings
IS:4012 Dust proof electric lighting fittings
IS:4013 Dust tight proof electric lighting fittings
IS:10322 Industrial lighting fittings with metal reflectors
IS:10322 Industrial lighting fittings with plastic reflectors
IS:2206 Well glass lighting fittings for use under ground in mines (non-

____________________________________________________________________________
Technical Specification: GTR Page 20 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
flameproof type)
IS:10322 Specification for flood light
IS:10322 Specification for decorative lighting outfits
IS:10322 Luminaries for street lighting
IS:2418 Tubular fluorescent lamps
IS:9900 High pressure mercury vapour lamps
IS:1258 Specification for Bayonet lamp fluorescent lamp
IS:3323 Bi-pin lamp holder tubular fluorescent lamps
IS:1534 Ballasts for use in fluorescent lighting fittings.
(Part-I)
IS:1569 Capacitors for use in fluorescent lighting fittings
IS:2215 Starters for fluorescent lamps
IS:3324 Holders for starters for tubular fluorescent lamps
IS:418 GLS lamps
IS:3553 Water tight electric fittings
IS:2713 Tubular steel poles
IS:280 MS wire for general engg. Purposes
Conduits, Accessories and Junction Boxes
IS:9537 Rigid steel conduits for electrical wiring
IS:3480 Flexible steel conduits for electrical wiring
IS:2667 Fittings for rigid steel conduits for electrical wiring
IS:3837 Accessories for rigid steel conduits for electrical wiring
IS:4649 Adaptors for flexible steel conduits
IS:5133 Steel and Cast Iron Boxes
IS:2629 Hot dip galvanising of Iron & Steel
Lighting Panels
IS:13947 LV Switchgear and Control gear(Part 1 to 5)
IS:8828 Circuit breakers for over current protection for house hold and
similar installations
IS:5 Ready mix paints
IS:2551 Danger notice plates
IS:2705 Current transformers
IS:9224 HRC Cartridge fuse links for voltage above 650V(Part-2)
IS:5082 Wrought aluminium and Al. alloys, bars, rods, tubes and sections
for electrical purposes
IS:8623 Factory built Assemblies of Switchgear and Control Gear for
voltages upto and including 1000V AC and 1200V DC
IS:1248 Direct Acting electrical indicating instruments
Electrical Installation
IS:1293 3 pin plug
IS:371 Two to three ceiling roses
____________________________________________________________________________
Technical Specification: GTR Page 21 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IS:3854 Switches for domestic and similar purposes
IS:5216 Guide for safety procedures and practices in electrical work
IS:732 Code of practice for electrical wiring installation (system voltage
not exceeding 650 Volts.)
IS:3043 Code of practice for earthing
IS:3646 Code of practice of interior illumination part II & III
IS:1944 Code of practice for lighting of public through fares
IS:5571 Guide for selection of electrical equipment for hazardous areas
IS:800 Code of practice for use of structural steel in general building
construction
IS:2633 Methods of Testing uniformity of coating on zinc coated articles
IS:6005 Code of practice for phosphating iron and steel
INDIAN ELECTRICITY ACT
INDIAN ELECTRICITY RULES
LT SWITCHGEAR
IS:8623 (Part-I) Specification for low voltage switchgear and control gear
assemblies
IS:13947 (Part-I) Specification for low voltage switchgear and control gear, Part 1
General Rules
IS:13947 (part-2) Specification for low voltage switchgear and control gear, Part 2
circuit breakers
IS:13947 (part-3) Specification for low voltage switchgear and control gear. Part 3
Switches, Disconnectors, Switch-disconnectors and fuse
combination units
IS:13947 (part-4) Specification for low voltage switchgear and control gear.
Part 4 Contactors and motors starters
IS:13947 (part-5) Specification for low voltage switchgear and control gear.
Part 5 Control-circuit devices and switching elements
IS:13947 (part-6) Specification for low voltage switchgear and control gear.
Part 6 Multiple function switching devices
IS:13947 (part-7) Specification for low voltage switchgear and control gear.
Part 7 Ancillary equipments
IS:12063 Degree of protection provided by enclosures
IS:2705 Current Transformers
IS:3156 Voltage Transformers
IS:3231 Electrical relays for power system protection
IS:1248 Electrical indicating instruments
IS:722 AC Electricity meters
IS:5578 Guide for Marking of insulated conductors of apparatus terminals
IS:13703 (part 1) Low voltage fuses for voltage not exceeding 1000V AC or 1500V
DC Part 1 General Requirements
IS:13703 (part 2) Low voltage fuses for voltage not exceeding 1000V AC or 1500V
DC Part 2 Fuses for use of authorized persons
____________________________________________________________________________
Technical Specification: GTR Page 22 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-C

CODES TITLE
IS:6005 Code of practice of phosphating iron and steel
IS:5082 Wrought Aluminum and Aluminum alloys for electrical purposes
IS:2633 Hot dip galvanising

____________________________________________________________________________
Technical Specification: GTR Page 23 of 23 (Annexure-C)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-D

LIST OF DRAWINGS/DOCUMENTS FOR SECOND ADVANCE

A. ELECTRICAL DRAWINGS/DOCUMENTS FOR SWITCHYARD

(1) Single Line Diagram

(2) Electrical Layout – Plan and Sections
(3) DSLP Calculation and drawing
(4) Structure Layout (Plan & Section) drawing
(5) Foundation & Cable Trench Layout
(6) Earthmat Layout
(7) Short circuit Force and Critical Span Calculations (for non-standard span)
(8) Cantilever Strength calculations (for non-standard span)

B. CIVIL DRAWINGS/DOCUMENTS

(1) Soil Investigation Report (if applicable)

(2) Structure Design, Foundation Design & Drawing, Plinth Beam Design & Drawing
and column Design & Drawing up to G.F. Level of control room building
(3) Structure Design, Foundation Design & Drawing, Plinth Beam Design & Drawing
and column Design & Drawing of GIS building(s)

C. DRAWINGS/DOCUMENTS OF EQUIPMENT

(1) Circuit Breaker, Isolator, CT, CVT, IVT, Surge Arrestor, Bus Post Insulator
- Drawing, GTP and Type test Reports
(2) Control and Relay Panels
- GTP and Type test Reports
(3) Substation Automation System (SAS)
- GTP and Type test Reports

D. DRAWINGS/DOCUMENTS OF POWER TRANSFORMER

(1) Design Review documents

(2) GA drawings for transformer, bushings
(3) Foundation Plan
(4) GTP
(5) RTCC -GA and schematic drawings
(6) Rating and Diagram Plate
(7) Power Transformer foundation design & drawings (if Applicable)
(8) For Single Phase Autotransformer (if Applicable)
- Single Line Diagram
- Electrical Layout & Section
- Foundation Layout including Neutral & Delta Formation

____________________________________________________________________________
Technical Specification: GTR Page 1 of 2 (Annexure-D)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-D

LIST OF DRAWINGS/DOCUMENTS FOR SECOND ADVANCE

E. DRAWINGS/DOCUMENTS OF REACTOR

(1) Design Review documents

(2) GA drawings for reactor, NGR, LA, bushings
(3) Foundation Plan
(4) GTP
(5) Rating and Diagram Plate
(6) Shunt Reactor, NGR & SA foundation design & drawings (if Applicable)
(7) For Single Phase Reactor (if Applicable)
- Single Line Diagram
- Electrical Layout & Section
- Foundation Layout including Neutral Formation

NOTES:-
1. The list of drawings/ documents mentioned above is a standard list. Some of the items may
not be applicable and need not to be referred for a particular substation package.
2. In case type tests are to be repeated/conducted, then approval of type test reports is not
required at this stage.
3. Category-II approved drawings shall also be considered for release of second/engineering
advance.

____________________________________________________________________________
Technical Specification: GTR Page 2 of 2 (Annexure-D)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

SL. NO. DRAWINGS/DOCUMENTS TITLE CATEGORY

1.00 SUBSTATION LAYOUT DRAWINGS
1.01 Single Line Diagram of substation A
1.02 Electrical layout (plan & section) drawing A
1.03 Overall General Arrangement drawing A
1.04 Structure loading diagram cum layout drawing A
1.05 DSLP Layout drawing A
1.06 Switchyard Foundation layout drawing A
1.07 Erection Key Diagram (plan & section) & Erection Bill of quantity A
1.08 Indoor Cable trench layout drawing A
1.09 Outdoor Cable trench layout drawing A
1.10 Buried cable trench layout drawing A
1.11 Lighting Fixture & conduit layout – Control room building A/R
1.12 Lighting Fixture & conduit layout – FFPH building A/R
1.13 Lighting Fixture & conduit layout – Transit camp (if applicable) A/R
1.14 Lighting Fixture & conduit layout – Switchyard/Street A/R
1.15 Lighting Fixture & conduit layout – Switchyard panel room A/R
1.15 Earthing layout - Control Room building A
1.16 Earthmat layout – Outdoor Switchyard area A
1.17 Layout drawing for gravel and fence A
1.18 Switchyard Road & drain layout drawing A
1.19 Layout drawing of Visual Monitoring System A
1.20 SLD of LT AC/DC systems A
1.21 LT switchgear room -Panel layout A
1.22 Fire Fighting Piping layout in the switchyard A
Fire protection system (Hydrant system & Extinguishers) for Control room
1.23 A
building, GIS Building & FFPH building etc
HVW spray system drawings (plan, elevation, side view, isometric view and
1.24 A
pylon support location details)
1.25 NIFPS drawings A
Fire detection & Alarm system for Control room building, GIS Building &
1.26 A
Switchyard panel room
1.27 Panel layout in Control room building A
1.28 Layout drawing for LT station A
1.29 Switchyard Panel room - Panel layout A
1.30 Power cable termination schedule R
1.31 Control cable termination schedule R
Applicable for GIS
Gas System Line Diagram (GAS SLD) indicating compartment details &
1.32 A
Weight
1.33 GIS Layout drawing including outdoor GIB (Plan & Section) A
1.34 Layout drawing of UHF sensors for PD Measurement A
1.35 GIS building - Layout drawing A
1.36 GIS Building – Lighting Fixture & conduit layout A
1.37 GIS Building - Layout drawing of Ventilation System A
____________________________________________________________________________
Technical Specification: GTR Page 1 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

1.38 GIS Building (Panel Room) – Air Conditioning system layout drawing A
1.39 GIS Building – Indoor cable trench Layout drawing A

2.00 DESIGN CALCULATION

2.01 DSLP Calculation A
2.02 Sag Tension & Short Circuit Force Calculation (if applicable) R
2.03 Lighting system design calculation (if applicable) R
2.04 Earthing system design calculation (if applicable) R
2.05 Battery/Charger sizing calculation (if applicable) R
2.06 Hydraulic calculations for Fire protection system R
2.07 AC & Ventilation calculation for GIS Building (if applicable) R
2.08 EOT crane sizing for GIS building R

3.00 GAS INSULATED SWITCHGEAR

3.01 Design Review document along with all supporting documents A
3.02 Guaranteed Technical Particular (GTP) A
3.03 Components GA drawing for CB, DS, ES, GIB, CT, VT, Spacers, Bushings etc. A
3.04 Schematics for CB, DS,ES, CT, VT etc. (Except for LCC) A
3.05 Type Test Reports for GIS Equipments A
3.06 Detailed drawing of Bus Extension Module
3.07 Foundation plan for GIS (Including Loading Data) A
3.08 Platform Arrangement R
3.09 Name Plates R
3.10 GA & Schematic drawings of Local Control Cabinets (LCC) A
3.11 GA & Schematic drawings of overhead crane A
3.12 Earthing layout inside GIS building R
3.13 Catalogues for R
a) SF6 gas leakage detector
b) SF6 gas filling & evacuation plant
c) SF6 gas Analyser
d) On line partial discharge monitoring system
3.14 List of Mandatory spares A
3.15 List of Special Tools & Tackles A
3.16 Instruction Manual including catalogue of sensors R

4.00 AUTOTRANSFORMER
4.01 Design Review A
4.02 Guaranteed Technical Particulars A
4.03 Outline General Arrangement Drawing with Bill of material (OGA parts list) A
4.04 Foundation Plan A
4.05 Over Fluxing withstand duration curve R
4.06 Hysteresis Characteristics & specific loss vs flux density curve of iron core R
4.07 General Arrangement & Control Schematic of OLTC along with write-up A
4.08 General Arrangement & Control Schematic of Marshalling Box, Common A
Marshalling Box and Cooler control cubicle along with write-up
____________________________________________________________________________
Technical Specification: GTR Page 2 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

4.09 General Arrangement & Control Schematic of Digital RTCC relay and cubicle A
4.10 Interconnection diagram of Drive Mechanism Box, Marshalling Box, A
Common Marshalling Box & Digital RTCC.
4.11 SCADA communication interface of online monitoring equipment A
4.12 Transport Drawing R
4.13 Technical Particulars of Online DGA, Drying system, FO system A
4.14 Outline and control schematic of NIFPS A
4.15 GA & GTP of bushings A
4.16 Earthing Arrangement Drawing (Internal & External) A
4.17 Drawing of Aircell, Conservator & Radiator A
4.18 Conservator & Tank Oil filling procedure plate R
4.19 Magnetizing Characteristics of bushings CT R
4.20 Rating and Diagram plate A
4.21 Oil flow Diagram R
4.22 Valve Schedule plate drawing A
4.23 GA of Twin-Bi directional roller A
4.24 Instruction Manual R
4.25 Type Test Report A

5.00 REACTOR
5.01 Design Review A
5.02 Guaranteed Technical Particulars A
5.03 Outline General Arrangement Drawing with Bill of material (OGA parts list) A
5.04 Foundation Plan A
5.05 General Arrangement & Control Schematic of Marshalling Box, Common A
Marshalling Box along with write-up
5.06 SCADA communication interface of online monitoring equipment A
5.07 Transport Drawing R
5.08 Technical Particulars of Online DGA, Drying system, FO system A
5.09 Outline and control schematic of NIFPS A
5.10 GA & GTP of bushings A
5.11 Earthing Arrangement Drawing (Internal & External) A
5.12 Drawing of Aircell, Conservator & Radiator R
5.13 Conservator & Tank Oil filling procedure plate R
5.14 Magnetization characteristics of Reactor Core and bushing CTs R
5.15 Hysteresis Characteristics & specific loss vs flux density curve of iron core R
5.16 Rating and diagram plate A
5.17 Voltage Ampere curve for Reactor R
5.18 Valve Schedule plate drawing A
5.19 GA of Twin bi-directional roller A
5.20 Instruction Manual R
5.21 Type test Report A

6.00 NEUTRAL GROUNDING REACTOR (NGR)

a) AIR CORE TYPE NGR
____________________________________________________________________________
Technical Specification: GTR Page 3 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

6.01 Design Review Document A
6.02 General Technical Particulars A
6.03 General Arrangement Drawing with BOM A
6.04 Main Coil Lifting Details R
6.05 Foundation Detail Drawing R
6.06 Main Coil & Insulator Assembly Drawing A
6.07 Terminal Detail Drawing A
6.08 Rating & Diagram Plate A
6.09 Transport Drawing R
6.10 NGR Pedestal Drawing A

b) OIL FILLED TYPE NGR

6.11 Design Review Document A
6.12 General Technical Particulars A
6.13 General Arrangement Drawing with BOM A
6.14 Foundation Detail Drawing R
6.15 Combined Foundation of Reactor, NGR and LA A
6.16 Rating & Diagram Plate A
6.17 Transport Drawing R
6.18 Control Schematic A

7.00 CIRCUIT BREAKER

7.01 GA drawing of SF6 CB A
7.02 GTP A
7.03 OGA drawing of control unit A
OGA drawing of support insulator, interrupter insulator, PIR chamber
7.04 R
insulator, grading capacitor insulator (as applicable)
7.05 Support structure & foundation plan drawing A
7.06 Schematic drawings/Wiring diagrams A
7.07 Rating and name plate drawing A
7.08 SF6 gas connection diagram R
7.09 Schematic diagram of operating mechanism R
7.10 GA drawing, GTP & Type Test Reports of Controlled Switching Device A
7.11 Terminal pad and corona rings R
7.12 Sectional view of interrupter R
7.13 Type Test Reports A
7.14 Instruction Manual R

8.00 ISOLATOR
8.01 GA drawing of Isolator with/without earth switch A
8.02 GTP A
8.03 Contact blade assembly (main & earth switch) R
8.04 Terminal pad & hinge contacts R
8.05 GA of MOM – main switch R
8.06 Schematic & wiring drawing for main switch R
8.07 Name plate - details A
8.08 GA of terminal pad A

____________________________________________________________________________
Technical Specification: GTR Page 4 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

8.09 GA of post insulator for isolator R
8.10 Type Test Report A
8.11 Instruction Manual R

9.00 INSTRUMENT TRANSFORMER (CT/CVT/IVT)

9.01 General Arrangement A
9.02 GTP A
9.03 Sectional view R
9.04 Sec. terminal box GA R
9.05 Wiring drawing of JB incl. interpole R
9.06 Terminal pads A
9.07 Schematic & rating plate R
9.08 Porcelain insulator R
9.09 Corona ring R
9.10 Type Test Reports A
9.11 Instruction Manual R

10.00 SURGE ARRESTER

10.01 GA of Surge Arrester A
10.02 GTP A
10.03 Porcelain/ Polymer insulator R
10.04 Cross sectional view R
10.05 Arrestor and unit name plate A
10.06 Corona & Grading rings R
10.07 Insulating base / surge counter detail R
10.08 Outline drawing of surge counter R
10.09 Circuit diagram of surge counter R
10.10 GA drawing of ZnO element R
10.11 Line terminal bracket with corona rings R
10.12 Drawing showing pressure relief arrangement. R
10.13 Type Test Report A
10.14 Instruction Manual R

11.00 BUS POST INSULATOR

11.01 GA drawing & GTP A
11.02 Type Test Reports A

12.00 Marshalling Box, Junction Boxes

12.01 GA drawings A
12.02 Schematic drawings A
12.03 Type Test Reports A

13.00 CONDUCTOR, AL. TUBE & GS EARTH WIRE

13.01 Type Test Reports (if applicable) A

____________________________________________________________________________
Technical Specification: GTR Page 5 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

14.00 DISC INSULATOR

14.01 GA drawing & GTP A
14.02 Type Test Reports A

15.00 LONG ROD POLYMER INSULATOR

15.01 GA drawing & GTP A
15.02 Type Test Reports A

16.00 INSULATOR STRING(S) WITH HARDWARE ASSEMBLY

16.01 GA drawing & GTP A
16.02 Component drawings R
16.03 Type Test Reports A

17.00 CLAMPS & CONNECTORS

17.01 GA Drawings A
17.02 Type Test Reports A

18.00 HORN GAP FUSE

18.01 GA drawing & GTP A
18.02 Type Test Reports A

19.00 BATTERY AND BATTERY CHARGER

19.01 GA drawing & GTP of Battery Bank A
19.02 GA drawing, GTP & Schematic Drawings of Battery Charger A
19.03 Type Test Reports of Battery & Charger A

20.00 ILLUMINATION
20.01 GTP/Catalogue of fittings/fixtures A
20.02 GA drawing of lighting poles/posts A
20.03 GA drawing of Junction box A
20.04 GA drawing of street lighting panel/outdoor/indoor lighting panel A
20.05 GA drawing of Receptacles A
20.06 Schematic drawing of panel/LDBs to fixtures R

21.00 LT SWITCHGEAR
21.01 SLD, GA & Schematic drawings of MSB A
21.02 SLD, GA & Schematic drawings of ACDB A
21.03 SLD, GA & Schematic drawings of 220V DCDB A
21.04 SLD, GA & Schematic drawings of 48V DCDB A
21.05 SLD, GA & Schematic drawings of MLDB A
21.06 SLD, GA & Schematic drawings of ELDB A
21.07 Type Test Reports A
21.08 Instruction Manual R
____________________________________________________________________________
Technical Specification: GTR Page 6 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

22.00 HT POWER CABLES

22.01 GTP & Catalogue A
22.02 Type Test Reports A

23.00 POWER & CONTROL CABLES

23.01 Type Test Reports for control cables A
23.02 Type Test Reports for power cables A

CONTROL AND RELAY PANELS & SUBSTATION AUTOMATION SYSTEM

24.00
(SAS), VISUAL MONITORING SYSTEM (VMS)
24.01 GTP for all protection relays, Travelling Wave Fault Locator, SAS Equipment A
Type Test Reports of all protection relays , Travelling Wave Fault Locator &
24.02 A/R
SAS IEDs
24.03 GA and schematic drgs. for :-
a) Relay and protection panels for all type of line(s) A
Relay and protection panels for all type transformer(s) including tertiary
b) A
loading
Relay and protection panels for bus/line reactor(s) (switchable & non-
c) A
switchable as applicable)
d) Relay and protection panels for tie bay(s) A
e) Relay and protection panels for TBC bay(s) A
f) Relay and protection panels for BC bay(s) A
g) Relay and protection panels for Bus Sectionaliser bay(s) A
h) Busbar protection panel (s) A
i) Breaker relay panel(s) A
j) Interface panel A
24.04 SAS Architecture A
24.05 Relay Settings A
24.06 GTP/Catalogue of VMS equipment A/R
24.07 GTP/Catalogue of Camera A/R
24.08 VMS architecture drawing A
24.09 Technical Literature and O&M manuals R

25.00 PLCC EQUIPMENTS

25.01 GTP/Drawings for PLCC Carrier Equipment A/R
25.02 GTP/Drawings for Wave traps A
25.03 GTP/Drawings Coupling device A
25.04 Digital/ Analog Protection coupler A
25.05 SNR calculation (if applicable) R
25.06 GTP/Drawing of HF cable A
25.07 Type Test Reports of PLCC equipment A
25.08 Testing & maintenance equipments R
25.09 Frequency Planning A
25.10 Technical literature and O&M Manuals R
____________________________________________________________________________
Technical Specification: GTR Page 7 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

26.00 DG SET
26.01 GTP A
26.02 Drawings/manuals A

27.00 AIR CONDITIONING & VENTILATION SYSTEM

27.01 Drawings/GTP/Catalogues A
27.02 A/C sizing calculation A

28.00 LT TRANSFORMER
28.01 GTP A
28.02 Drawings A
28.03 Type Test Reports A

29.00 FIRE PROTECTION SYSTEM

29.01 Fire Fighting Annunciation & control panels A
29.02 GA and Schematic for LCP for deluge valve operation A
29.03 Hydraulic calculations for HVW spray network R
29.04 Drawing for deluge valve housing A
29.05 GTP & drawings for strainers (Y type & basket strainer) A
29.06 Drawing of valve pit details A
29.07 System write-up with various settings A
GTP & drawing for gate valve, check valve, solenoid valve, outdoor hydrant
29.08 A
valve
29.09 GTP & catalogue for deluge valve, spray nozzles & projectors A
29.10 GTP & catalogue for quatrzoid bulb detector A
29.11 GTP & drawing for pressure switch, pressure gauge A
29.12 GTP for G.I. & M.S. pipes & pipe accessories A
29.13 Any other drawing/document required for completion of work A/R

CONTROL ROOM BUILDING / TRANSIT CAMP /FFPH BUILDING/

30.00 SWITCHAYRD PANEL ROOM/INDOOR HT SWITCHGEAR A
ROOM/TOWNSHIP BUILDINGS (AS applicable)
30.01 Architectural drawing
a) Plan, section & elevation
b) Doors & windows schedule
30.02 Building design calculation (if applicable)
30.03 Civil Construction design/drawings

31.00 DRAWING FOR GIS BUILDING (If applicable) A

31.01 Architectural drawing
a) Plan, section & elevation
b) Doors & windows schedule
31.02 GIS building superstructure drawings & design calculation
31.03 Civil Construction design/drawings

____________________________________________________________________________
Technical Specification: GTR Page 8 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-E

COMPREHENSIVE LIST OF DRAWINGS

31.04 GIS Equipment foundation inside GIS building

32.00 Switchyard Civil Construction Drawings (as applicable) A

a) Tower Foundation
b) Equipment Foundation
c) Transformer foundation
d) Reactor foundation
e) Road construction including culverts, rail cum road
f) Switchyard fencing & Gate
g) Cable trench section
h) Drain section
i) Rain harvesting
j) Boundary wall
k) DG set foundation
l) LT transformer foundation
m) Car Parking Shed/Security Room
n) Outdoor GIB foundation
o) Outdoor Sf6/Air bushing foundation
p) BMK/ Lighting pole foundation
q) Fire Wall
r) Drawing of contour levels
s) Drawing of Formation levels
t) Soil Investigation Report
u) Any other foundation inside switchyard

DESIGN, FABRICATION & PROTO CORRECTED DRAWINGS OF ALL

33.00 A/R
TYPES OF TOWERS & BEAMS

DESIGN, FABRICATION DRAWINGS FOR EQUIPMENT SUPPORT

34.00 A/R
STRUCTURES

35.00 MISCELLANEOUS CIVIL DRGS A/R

LEGEND:- A – for Approval; R- for Record

NOTES:-

1. In case any additional drawings/documents are required, the same shall also be
submitted during execution of the contract.

2. In case, some drawings as mentioned in the above list are not applicable for the
scope of work, the same shall not be referred to.

____________________________________________________________________________
Technical Specification: GTR Page 9 of 9 (Annexure-E)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)

Annexure- F

Assessment report from Contractor for proposed sub-vendor along with following
enclosures (to the extent available):

1. Registration / License of the works

2. Organization chart with name and qualification of key persons
3. List of Plant and Machinery.
4. List of testing equipment with their calibration status.
5. List of Raw material, bought out items with sourcing details
6. List of out-sourced services with sourcing details.
7. List of supply in last three years.
8. Third party approval, if any (viz. ISO, BIS),
9. Pollution clearance wherever applicable
10. Energy Conservation & Efficiency report
(Applicable to industries having contract load more than 100 KVA)
11. Formats for RM, in process and acceptance testing
12. Type test approvals conducted in last 5 years, if applicable
13. Performance Certificates from customers
14. Photographs of factory, plant and machinery & testing facilities

____________________________________________________________________________
Technical Specification: GTR Page 1 of 1 (Annexure-F)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
Annexure-G

MQP & INSPECTION LEVEL REQUIREMENT

Sl. Item / Equipment Requirement of Inspection

No. MQP/ITP/FAT Level
1A Transformer /Reactor Yes IV
1B Circuit Breakers Yes IV
2 Current transformer Yes IV
3 Capacitive voltage transformers/Potential Yes IV
transformer
4 Isolators Yes IV
5 Lightening Arrestors Yes III
6 Line Trap Yes III
7 Control & Relay Panels Yes III
8 Power Cables Yes III
9 Control Cables Yes III
10 LT Switchgear & ACDB/DCDB/MLDB/ELDB/ Yes III
Lighting Panels
11 Fire protection system
11-A Panels, Deluge valve, Hydro pneumatic tank. No III
11-B Strainers, extinguishers, MS/GI pipes, Pumps, No II
motors, air compressor, and other valves,
Diesel Engines
11-C Others No I
12 Insulator (Disc, Long Rod, Solid Core) Yes IV
13 Conductor Yes IV
14 Clamps & Connecters (including equipment Yes III
connectors)
15 Junction Box / Lighting Switch Boards / Bay No II
MB/Telecom Equipment Cabinet
16 Cable lugs No I
17 Lighting Fixtures ,Lamps & fans No I
18 Switches No I
19 Conduits No I
20 Lighting Poles No II
21 MS/GI /PVC Pipes for cable trenches and No I
lighting
22 Hume Pipes No I
23 Galvanized Cable trays No II
24 MS/ GI Flat and earthing material No II
25 MS Round for Earthmat (40mm dia) No I
26 Lighting Earthwire No I
27 Aluminium Tube & Busbar materials No II
28 Outdoor Receptacle No I
29 Nut / Bolts / Spring Washers (Gr 5.6/5) No II
30 LT Transformer Yes III
31 Battery No II
32 Battery Charger Yes III
__________________________________________________________________________
Technical Specification: GTR Page 1 of 3 (Annexure-G)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
Annexure-G

Sl. Item / Equipment Requirement of Inspection

No. MQP/ITP/FAT Level
33 D. G. Set No II
34 Split A.C/window A.C. No I
35 Substation Automation system No III
36 Telephone wires No I
37 Telephone sockets No I
38 Aluminium ladder No I
39 Occupancy sensors for control of lighting No I
40 Sub Station Structure (lattice/pipe type) Yes III
41 HG fuse No II
42 PLCC equipment Viz PLCC Terminal ,Carrier Yes III
equipment, Protection Coupler , Coupling
Device but excluding EPAX / HF Cable/ SDH
Equipment
43 HF Cable / GPS Clock No I
44 EPAX No I
45 Cable Glands / Joints /Clamps/ Termination No I
46 Video Monitoring System No II
47 Controller for switching No IV
48 Solar based street lighting pole including solar No III
panel as per technical specification
49 Event Logger No III
50 Lighting transformers Yes II
51 String Hardware Yes IV
52 Test Equipment No I*
53 GS Earthwire Yes IV
54 Oil Storage Tank Yes III
55 Insulating Oil No III
56 Flow sensitive conservator isolation valve No II **
57 On-Line insulating oil drying system No II **
58 On line DGA & Moisture Analyzer No II **
59 WAMS-(PMU & Accessories) Yes III
60 FO Cable Yes III
61 Re-rollers of MS/HT Angle Section and Yes IV
galvanized tower parts.
62 Hardware fittings & Earthwire Accessories Yes IV
63 OPGW & H/W Yes III
64 Bolts & Nuts Gr up to 5.6/5 Yes II
65 Bolts & Nuts of Gr 8.8 / 8 Yes IV
66 D-shackle/ Hanger / Links Yes IV
67 Danger Plate /Phase Plate / Number Plate / No I
Circuit plate
68 Pipe Type & Counter Poise Earthing No II
69 Spring Washer No II
70 ACD & Barbed wire for ACD/Bird guard No II

__________________________________________________________________________
Technical Specification: GTR Page 2 of 3 (Annexure-G)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
Annexure-G

Sl. Item / Equipment Requirement of Inspection

No. MQP/ITP/FAT Level
71 Span Marker & Obstruction Light No III
72 GIS including spares Yes IV
73 GIS Bus Duct Yes IV
74 GIS Bushing Yes IV
75 SF6 Gas processing Unit No II
76 Partial Discharge Monitoring System No II
77 STATCOM including Valve, valve base Yes IV
electronics, DC capacitor, series reactor and all
accessories
78 Mechanically switched Reactor bank (3-ph) Yes IV
including all accessories (MSR Branches)
80 Mechanically switched Capacitor bank (3-ph) Yes IV
including all accessories (MSC Branches)
81 Pass Harmonic filters Yes IV
82 Valve cooling system Yes III
FODP including pigtail No II
Radio link Telecom Yes III
Hardware Fittings for Fibre Optic approach Yes III
cable
SDH Equipments (ADM), PDH, Primary Yes IV
Multiplexer
Drop & Insert Multiplexer Yes IV
DACS Yes IV
Main Distribution Frame No I
HDPE Pipe No II
NMS, TMN Yes IV
Synchronization Equipment No Level-I
93 HT Capacitor Yes IV
94 PLC Capacitor Yes III
95 48V DCPS Yes III
96 Nitrogen Injection system Yes III
97 Foundation/Anchor bolts Yes III
98 EOT crane/Lift No II
99 Optical Signal Column No II
100 Maintenance Platform No II
101 Spark Gap Yes III
102 Thyristor Valve Yes III
103 DC current & voltage measuring device ITP III
104 Furniture No I

Note:
* MICC for test and measuring equipment shall be issued only after actual
verification/demonstration of satisfactory performance at site.
** Though level-2 items, CIP can be issued also on review of TCs and visual
inspection of these items.
__________________________________________________________________________
Technical Specification: GTR Page 3 of 3 (Annexure-G)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-H
RTV Silicone high voltage insulation coating (HVIC)
1.0 General

The scope of work shall include supply, delivery and application of RTV silicone high
voltage insulation coating for Substations at coastal area.
a) The supplied virgin RTV coating material shall have sufficient margin before expiry
of its shelf life (Date of manufacturing shall not be older than two months from
date of delivery). Application of RTV coating material on the equipment after
expiry of its shelf life will not be permitted.
b) All the required materials, tools and tackles, testing equipment, consumables etc.
for application of HVIC coating shall be in the contractor’s scope.
c) Surface preparation: All insulation surfaces of the equipment to be coated shall be
made free from dust, grease, oil and any other foreign material without damaging
the surface. The surface of the equipment shall be made dry before application of
the RTV coating.
d) Preparation/mixing of the virgin RTV coating materials shall be done strictly as per
recommendations of the original manufacturer only.
e) The application of the properly prepared /mixed virgin RTV coating materials shall
be done by certified applicants of original manufacturer only.
f) The coating shall cover complete insulation surface of the equipment.
g) Coated insulation surface of the equipment after full cure shall be smooth and free
from any defect viz. scratches, uneven surface etc.
h) Following tests are to be carried out by the contractor after full care of coatings.

(i) Hydrophobic test on 1-2 coated equipment as per STRI guidelines and the
results shall be HC2 class or better.

(ii) BDV testing of fully cured coating in the lab.

(iii) Bonding/adherence test at site: The sample coated insulator shall be put in
water and boiled for 02 hours and removed. The coating shall not exhibit
water blisters at the interface between the insulator surface and the coating.

(iv) High pressure water withstand test at site: A high pressure water wash test
shall be performed on sample coated insulator. The RTV coating shall
withstand the pressure without any damage to it.

(v) Thickness measurement of RTV coating at site: Test shall be performed on

each of the equipment coated to confirm the thickness of the coating on the
respective equipment.

i) Any other item which is not specifically mentioned above but are required for
successful completion of the work shall be in this scope of work.

____________________________________________________________________________
Technical Specification: GTR Page 1 of 2 (Annexure-H)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 SECTION-GENERAL TECHNICAL REQUIREMENTS (GTR)
ANNEXURE-H
RTV Silicone high voltage insulation coating (HVIC)
2.0 Technical Requirements

a) RTV Silicon compound in its liquid form

Material Properties Requirement

Material Type One part RTV
Appearance Paint
Filler type ATH, Quartz or both
Color Gray
Substrate Application Temperature Range °C -4°C to 121°C
Tack free at 25°C and 50% RH 30 minutes

b) Properties of RTV Silicon compound after cured

Parameters Requirement

Application Area Glass, Porcelain, station insulators,

as well as bushing, instrument
transformers and related devices
Full cure time Max. 24 hours
Recommended coating thickness 500 microns+ 10%, dry film
Dielectric Strength, (ASTM D 149) > 25 kV/mm
Volume Resistivity, ohm.cm (ASTM D257) 9.0*10^14
Tracking wheel withstand, hours 5000 Hours
Min. Salinity Level withstood during “Artificial >160 kg/m^3
Pollution Test using Salt Fog Method”
Hydrophobic Recovery Test (REC specification To H1 or H2
76/2006)
Method of Application Airless Spray
Arc resistance 420 sec or better (As per ASTM D
495 – 99 (Reapproved 2004))
Tracking resistance 1A 4.5 or better (As per IEC 60587,
i.e. 5 specimen shall survive tracking
Primer Required NO primer material shall be allowed

Resistant to Marine salt fog, Water, Industrial

(cement dust, fly ash, acid emission
etc.), Rough Weather Conditions
Other Properties Non Hazardous to environment,
surface after full cure shall be
smooth

____________________________________________________________________________
Technical Specification: GTR Page 2 of 2 (Annexure-H)
C/ENGG/SPEC/GTR (Rev. No.:-14, Jan’17)
 Technical Specification for RTV Silicone high voltage insulation coating (HVIC)

1. SCOPE OF RTV COATING:

The scope of work shall include supply, transportation and application of RTV silicone rubber high
voltage insulator coating and cleaning/removal of waste from the equipment.
a) All the required materials, tools & tackles, testing equipments including man lift etc. are in the
scope of successful bidders/ contractor.
b) Surface preparation:
All equipment surfaces to be coated should be made free from dust, grease, oil etc. & other
foreign matter. Also the surface meant for application must be dry.
c) The RTV coating supplied for application should be properly mixed before application as per the
recommendations of manufacturer. The coating should cover complete surface and should be
applied in manner that prevents runs, sags, drips, spills etc. The application shall be done by
certified applicant of Manufacturer.
d) Successful bidder/ contractor shall submit the detailed field quality plan for approval. It is not the
intention of this specification to specify completely herein all details and design requirements.
However, the materials offered & work execution shall confirm in all respects to high standards
of engineering and workmanship and be capable of performing in continuous commercial
operation up to guarantee in a manner acceptable to purchaser.

2. CLIMATIC CONDITIONS:

The overall climate is moderate hot, humid, tropical, highly polluted and conducive to rust and fungus
growth. The climatic conditions are prone to wide range of outdoor service conditions.

3. APPLICABLE CODES AND STANDARDS

The latest revision/amendments of the following Codes and Standards shall be applicable for the
equipment/material covered in this Technical Specification. In case of conflict, the
vendor/manufacturer may propose equipment/material conforming to one group of Industry Codes and
Standards quoted hereunder without jeopardizing the requirements of this Technical Specification.
IEC 60243-1 Electric strength of insulating materials - Test methods - Part 1: Tests at
power frequencies
IEC TR 62039 Selection guide for polymeric materials for outdoor use under HV stress
IEC 60250 Recommended methods for the determination of the permittivity and
dielectric dissipation factor of electrical materials at power, audio and radio
frequencies including meter wavelengths
IEC 60587 Electrical insulating materials used under severe ambient conditions - Test
methods for evaluating resistance to tracking and erosion
IEC TS 62073 Guidance on the measurement of hydrophobicity of insulator surfaces
IEC 61621 Dry, solid insulating materials-Resistance test to high - voltage, low -
current arc discharges
IEC 62217 Polymeric HV insulators for indoor and outdoor use-General definitions,
test methods and acceptance criteria
IEC 62631-3-2 Dielectric and resistive properties of solid insulating materials - Part 3-2:
Determination of resistive properties (DC methods) - Surface resistance and
surface resistivity
IEEE Std 957 IEEE Guide for Cleaning Insulators
IEEE Std 1523 IEEE Guide for the Application, Maintenance and Evaluation of Room
Temperature Vulcanizing (RTV) Silicone Rubber Coatings for Outdoor
Insulation Applications.
 Technical Specification for RTV Silicone high voltage insulation coating (HVIC)

ASTM D149-09 Standard Test Method for Dielectric Breakdown Voltage and Dielectric
Strength of Solid Electrical Insulating Materials at Commercial Power
Frequencies
ASTM D150-11 Standard Test Methods for AC Loss Characteristics and Permittivity
(Dielectric Constant) of Solid Electrical Insulation
ASTM D257-14 Standard Test Methods for DC Resistance or Conductance of Insulating
Materials
ASTM D495-14 Standard Test Method for High - Voltage, Low - Current, Dry Arc
Resistance of Solid Electrical Insulation
CEA LWIWG-02 (1996) Line Post Composite Insulator for Overhead Distribution Lines

4. Technical Parameters

4.1 RTV Silicon compound in its liquid form shall have the following properties:

Material Properties Requirement

Material Type One part RTV
Appearance Paint
Filler type ATH, Quartz or both
Color Gray
Percent of solids by weight ≥ 70%
Substrate Application Temperature Range °C -4°C to 121°C
Tack free at 25°C and 50% RH 30 minutes

4.2 RTV Silicon coating after cured form shall have the following properties:

Parameters Requirement
Application Area Glass, Porcelain, station insulators, as well as
bushing, instrument transformers and related
devices
Full cure time ≥ 24 hours
Coating thickness 500 microns + 10% tolerance,
dry film thickness
Dielectric Strength ≥ 20 kV/mm
Volume Resistivity ≥ 1.0*10^12 ohm.m
Tracking and Erosion test 1000 Hours
Min. Salinity Level withstood during “Artificial >160 kg/m^3
Pollution Test using Salt Fog Method”
Hydrophobic Recovery Test HC2 or HC1
Method of Application Airless Spray
Dry Arc resistance Tract ≥ 140 seconds
Burn Out ≥ 420 seconds
Tracking and Erosion (IEC 60587, Method 1: Class 1A 4.5kV or better
Application of constant tracking voltage)
Primer Required No primer material shall be allowed
Resistant to Marine salt fog, Water, Industrial (cement dust, fly
ash, acid emission etc.), Rough Weather
Conditions
Other Properties Non Hazardous to environment, surface after full
cure shall be smooth
 Technical Specification for RTV Silicone high voltage insulation coating (HVIC)

4.3 Materials

4.3.1 The RTV Silicone high voltage insulation coating shall be ultraviolet (UV) radiation exposure resistant.
The finished product shall withstand the adverse atmospheric conditions due to weather, proximity to
the coast, fumes, ozone, acids (particularly nitric acid in the coastal areas and sulphuric acid in the oil
field areas), bases/alkalis, and hydrocarbon components, dust or rapid changes to air temperature
(temperature extremes). There shall not be significant material degradation such as development of
surface cracks and unacceptable increase in surface hardness etc.

4.3.2 The RTV Silicone high voltage insulation coating shall be resistant to atmospheric and chemical
degradation. Salt air, airborne pollutants, industrial pollutants such as cement dust, sulphur, rain and
humidity shall not result in flashover on the coating.

4.3.3 The RTV Silicone high voltage insulation coating shall be resistant to arcing and corona. The Coating
shall exhibit high tracking resistance to reduce damage during salt-storms (storms arising from the sea)
or other severe contamination events. The track resistance of the RTV Silicone Rubber Insulator
Coating material shall meet the requirements of IEC 60587, Method 1, Class 1A 4.5kV.

4.3.5 The RTV Silicone high voltage insulation coating shall be a single component, ready-to-use after
simple mixing. It shall not require excessive mixing/shaking and thinning/dilution before use. The
Coating shall be moisture curable at room temperature.

4.3.6 The RTV Silicone high voltage insulation coating shall exhibit long-term water repellency and
hydrophobicity.

4.3.7 The RTV Silicone high voltage insulation coating shall not require use of any primer on the ceramic
insulators for adhesion purposes.

4.3.8 The RTV Silicone high voltage insulation coating shall be easy to be reapplied. The Coating shall have
excellent arc resistance, excellent unprimed adhesion, easy to apply and spray-able as well as paint-
able.

4.3.9 The RTV Silicone high voltage insulation coating shall have a minimum 12 months shelf life, which
shall effect from the date of manufacturing. The manufacturer shall submit the warranty to this effect.
The expiry date shall be marked on the containers. The remaining shelf life of the material shall be at
least six (6) months when delivered to site. The coating shall be supplied in cans weighing not more
than 25kg.

4.4 Composition and Properties

4.4.1 The RTV Silicone high voltage insulation coating shall be capable of withstanding high-pressure water
power washing. To prove this property, a power wash test shall be performed per requirements stated
hereafter in this standard.

4.4.2 The RTV Silicone high voltage insulation coating shall protect the ceramic insulators (porcelain and
glass) against flashovers caused by pollution.

4.4.3 The manufacturer shall advise/recommend suitable method of application and submit written
application instructions and shall suggest suitable equipment set-up (size of pump and compressors,
etc.) and the compatibility of his product to be reapplied on the RTV coating from other manufacturers.

4.4.4 The warranty for RTV coating on the equipments shall be for a period of 5 years.
 Technical Specification for RTV Silicone high voltage insulation coating (HVIC)

4.5 Markings

The packing and expiry dates of coating shall be labeled on the coating cans. The expiry date shall be
considered from the packaging date and not from the date of shipment of the coating.

The cans shall be marked for “flammable” or “non-flammable” depending upon the type of solvent
used for the dispersion of the coating.

5.0 TESTS

All test results shall be provided for review and acceptance by customer.

5.1 Type Tests

5.1.1 Type tests as prescribed in relevant standards shall be performed on RTV coated sample tiles or RTV
coated insulators as applicable to verify the suitability of the design, materials and method of
manufacture. Testing shall include, but not limited to following. These tests shall be performed only on
the new design of RTV silicone high voltage insulation coating. The test reports shall be submitted
from tests done in a NABL/International accredited lab.

a) Tracking and erosion resistance test (IEC 60587, Method 1, Class 1A 4.5kV). Samples shall
consist of smooth porcelain plates of 6mm (± 0.5mm) thickness coated with the thickness of the
material as proposed by the manufacturer for the offered coating. Breaking of porcelain substrate
shall not be allowed.

c) Salt-fog tests

The 1000 hour Tracking and erosion test outlined in IEC-62217 shall be carried out.

d) Dry arc resistance test

Dry arc resistance test shall be carried out as per ASTM D495.

e) Contact Angle Measurement Test:

Receding contact angle measurement test shall be performed in accordance with IEC TS 62073.

f) BDV testing of fully cured coating.

The test shall be carried out as per IEC:60243-1 or ASTM D149.

g) Volume Resistivity Test

The test shall be carried out as per IEC:60093. Sample thickness shall be 2mm which can be
obtained by using an open mould casting technique. The minimum volume resistivity as
specified shall be achieved.

h) Artificial Pollution Test in general with IEC 60507 without the pre-condition test.

i) Adhesion Test as type test:

Adhesion test shall be performed in accordance with Canadian Electric Association (CEA)
specification LWIWG-02 (96) or any other equivalent standard to verify the bonding
characteristics of the RTV Silicone Rubber Coating when applied to ceramic insulators. Three
(3) coated insulators shall be put in water having 0.1% by weight of NaCl and boiled for 100
hours (each sample separately). At the end of boiling, allow each insulator to remain in the water
until the water cools to about 50oC. The coating shall not exhibit any water blisters at the
interface between the insulator surface and the coating.
 Technical Specification for RTV Silicone high voltage insulation coating (HVIC)

5.2 Acceptance Tests (at Site or Factory)

a) Thickness measurement:

Dry film thickness (DFT) of the coating shall be measured at site on all Equipments randomly at
least at one point of the Equipment.

b) Adhesion Test as acceptance test:

Adhesion test shall be performed at site in accordance with CEA specification LWIWG-02 (96)
or any other equivalent standard to verify the bonding characteristics of the RTV Silicone
Rubber Coating when applied to ceramic insulators. Three (3) coated insulators shall be put in
water having 0.1% by weight of NaCl and boiled for 2 hours (each sample separately). At the
end of boiling, allow each insulator to remain in the water until the water cools to about 50oC.
The coating shall not exhibit any water blisters at the interface between the insulator surface and
the coating.

c) High Pressure Water Withstand Test:

A power water wash test shall be performed at site on 5% sample in accordance with IEEE Std
957 to demonstrate that the RTV coated insulators can be power washed without any damage to
RTV coating. The test shall be a water spray of a solid stream through a 6mm diameter nozzle at
3800 kPa for a period of 10 (ten) minutes. The nozzle of the spray equipment shall be at a
distance of 3m from the insulator surface. There should not be any damage to the coating.

d) Hydrophobicity test :

Hydrophobicity test shall be carried out on virgin material at site on 5% sample on 1-2 coated
equipment as per STRI guidelines and the results shall be HC2 class or better. Hydrophobicity
test shall be carried out after completion of high pressure water withstand test.
 TECHNICAL SPECIFICATION
SECTION: SWITCHGEAR-CB
REVISION-11

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 1 of 27
Summary of major changes made in this revision w.r.t earlier Technical Specification,
Section: Switchgear, Chapter-CB, Rev.10A & Section: Switchgear, Chapter 765kV
CB, Rev.02

1) Technical specification, Section: Switchgear, Chapter 765kV CB, Rev.02 and Section:
Switchgear, Chapter CB, Rev.10A are merged to prepare this combined technical
specification section up to 765kV CB.

2) All 765kV & 400kV Circuit Breaker control schematics shall be finalized in such a
way, that it may operate with or without CSD (refer clause 1.6)

3) Some duty requirements parameters added/modified (refer clause 2.0)

4) SF6 gas for main CBs shall be supplied in returnable cylinders (refer clause 5.0)

5) Insulators for Circuit breakers can be of Porcelain/polymer type (refer clause 6.0)

6) Included Indicative platform & ladder drawing for 400kV&765kV CB (refer clause
9.0)

7) Included Plug-in type arrangement for termination of inter pole cables (refer clause
11.0)

8) Included Technical parameters for 72.5kV CB (refer clause 16.0)

9) Some parameters like dielectric, creepage, seismic requirement etc w.r.t CBs are
included (refer clause 16.0)

10) Included Actions required for defects observed during defect liability period (refer
clause 18.0)

Note:
Changes made in this document are shown with bold letters, further major changes
are listed above; however for complete details of changes, please refer the complete
technical specification, Section: Switchgear-CB, REV.11

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 2 of 27
 SECTION: SWITCHGEAR–CB (CIRCUIT BREAKER)

CONTENTS

Clause.No. Description Page No.

1.0 General 4

2.0 Duty requirements 4

2.6 Controlled Switching Device (CSD) 7

3.0 Total Break Time 9

4.0 Constructional Features 9

5.0 Sulphur Hexafluoride Gas (SF6 Gas) 11

6.0 Insulators 11

7.0 Spare Parts and Maintenance Equipment 11

8.0 Operating Mechanism and Control 12

9.0 Support Structure 15

10.0 Terminal Connector Pad 16

11.0 Inter-pole Cabling 16

12.0 Fittings and Accessories 17

13.0 Additional Data to be Furnished 18

14.0 Dead Tank Type Circuit Breaker 19

15.0 Tests 19

16.0 Technical Parameters for Circuit Breaker 21

17.0 Pre-commissioning tests 24

18.0 Actions required for defects observed during defect

Liability period 26

9.b) drg: Indicative drawing for Platform details of 400kV&

765kV CB 27

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 3 of 27
 SECTION: SWITCHGEAR–CB (CIRCUIT BREAKER)

1.0 GENERAL

1.1 The circuit breakers and accessories shall conform to IEC: 62271-100, IEC:
62271-1 and other relevant IEC standards except to the extent explicitly
modified in the specification and shall also be in accordance with
requirements specified in Section-GTR.

1.2 800/420/245/145/72.5kV circuit breakers offered would be of sulphur

hexafluoride (SF6) type and of class C2-M2 as per IEC. The bidder may offer
circuit breakers of either live tank type or dead tank type of proven design.

1.3 The circuit breaker shall be complete with operating mechanism, common
marshalling box, piping, inter-pole cables, cable accessories like glands,
terminal blocks, marking ferrules, lugs, pressure gauges, density monitors
(with graduated scale), galvanised support structure, platform with ladder
for CB, their foundation bolts and all other accessories required for carrying
out all the functions of the CB.

All necessary parts to provide a complete and operable circuit breaker

installation such as terminal pads, control parts and other devices shall be
provided.

1.4 Painting shall be done in line with Section – GTR. Paint shade RAL-7032 or
similar shades can be used for painting. The support structure, platform &
ladder of circuit breaker shall be hot dip galvanised. Exposed hardware items
shall be hot dip galvanised or Electro-galvanised.

1.5 The circuit breakers shall be designed for use in the geographic and
meteorological conditions as given in Section-Project.

1.6 All 765kV & 400kV Circuit Breaker control schematics shall be finalized
in such a way, that it may operate with or without CSD by using a
suitable selector switch irrespective of whether circuit breakers to be
supplied are envisaged along with CSD or not as per bid price schedules.

2.0 DUTY REQUIREMENTS

2.1 The circuit breakers shall be capable of performing their duties without
opening resistors.

2.2 The circuit breaker shall meet the duty requirements for any type of fault or
fault location and also for line switching when used on effectively grounded
system and perform make and break operations as per the stipulated duty
cycles satisfactorily.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 4 of 27
2.2.1 PRE-INSERTION RESISTER

800kV & 420kV circuit breakers shall be provided with single step pre-
insertion closing resistors (wherever the requirement of PIR is explicitly
specified in bid price schedules) to limit the switching surges. The
resistance value of pre-insertion resistor and the duration of pre-insertion time
is given in clause 16.0 of this section. The resistor shall have thermal rating
for the following duties:

i) TERMINAL FAULT

Close .... 1 Min .... Open Close Open…..2 min ..... Close ..... 1 Min ........
Open Close Open.

ii) RECLOSING AGAINST TRAPPED CHARGES

Duty shall be the same as under (i) above. The first, third and fourth closures
are to be on de - energised line while second closing is to be made with lines
against trapped charge of 1.2 p.u. of opposite polarity.

iii) OUT OF PHASE CLOSING

One closing operation under phase opposition, that is with twice the voltage
across the terminals.

iv) No allowance shall be made for heat dissipation of resistor during time
interval between successive closing operations. The resistors and resistor
supports shall perform all these duties without deterioration. Test reports of
resistors proving thermal rating for duties specified above shall be furnished
during detailed engineering. The calculations shall be provided to take care
of the effect of tolerances on resistance values and insertion time.

2.3 The breaker shall be capable of:

i) Interrupting the steady and transient magnetizing current corresponding

to Power transformers as follows:

Voltage rating of CB Type of Transformer Rating (in MVA)

800kV 765/400kV 250 to 1500

420kV 765/400kV 250 to 1500

400/220kV 250 to 630

400/132kV 160 to 315

245kV 400/220kV 200 to 630

220/132kV 50 to 200

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 5 of 27
 220/66kV 50 to 200

145kV 220/132kV 50 to 200

132/33kV 10 to 50

ii) Interrupting line/cable charging current as per IEC without use of

opening resistors. The breaker shall be able to interrupt the rated
line charging current as per IEC-62271-100 with test voltage
immediately before opening equal to the product of U/√3 and 1.4

iii) Clearing short line fault (kilometric faults) with source impedance
behind the bus equivalent to symmetrical fault current specified.

iii) Breaking 25% of the rated fault current at twice rated voltage under
phase opposition condition.

iv) Withstanding all dielectric stresses imposed on it in open condition

at lock out pressure continuously (i.e. shall be designed for 2 p.u.
across the breaker continuously, for validation of which a power
frequency withstand test conducted for a duration of at least 15
minutes is acceptable).

v) Circuit breakers shall be able to switch in and out the shunt reactor
as detailed below:

Voltage rating of Reactor Rating Max. rise of over

CB (in MVAR) voltage (in p.u.)
800kV 150 to 330 1.9

420kV 50 to 150 2.3

245kV 25 to 50 2.3

a. Capability of 400 kV circuit breakers to interrupt inductive

current below 100 A without giving rise to overvoltage more than
2.3 p.u. (As specified in IEC-62271-110) shall be validated by
carrying out the simulation study/analysis (EMTP/PSCAD) by
modeling an equivalent circuit comprising all circuit component
i.e. Inductance of Shunt Reactor, Stray capacitance of Shunt
Reactor, Circuit Breaker, Stray capacitance of Bus Connection,
Capacitance of grading Capacitor, inductance of neutral
grounding reactor, Network Thevenin’s equivalent, any other
series/parallel inductance/capacitance connected to simulate the
actual inductive load switching.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 6 of 27
 b. Current chopping capability (chopping number) of circuit breaker
as per IEC-62271-306 to be figured out from actual Laboratory
test and / or field test report and same Current chopping
capability (chopping number) shall be used in above said
simulation study/analysis.

c. To validate the results of above said simulation study/analysis

report, the same study shall be carried out for capability of tested
circuit breaker and the study/analysis results shall be comparable
with actual Laboratory test and / or field test reports.

d. Laboratory test/ field test reports shall be submitted for 400 kV

CBs in case there is change in design including change in
following:
i. Different short circuit current capability
ii. Different model/type

vi) The breakers shall also withstand the voltages specified under clause
16.0 of this section.

2.6 CONTROLLED SWITCHING DEVICE (CSD) :

Circuit Breakers shall be equipped with controlled switching device with

consequent optimization of switching behavior, when used in:

- Switching of transformer (from 765kV and 400kV side circuit

breakers only)
- Switching of shunt Reactor
The CSD shall be provided in Circuit breaker of switchable line reactor bay
and in Main & Tie bay circuit breakers of Transformers, line with non-
switchable line reactors and Bus reactors. The CSD shall be supplied as
per bid price schedules.

2.6.1 Technical Requirement for controlled switching device:

a) The CSD shall be designed to operate correctly and satisfactorily with the
excursion of auxiliary A/C & DC voltages and frequency as specified in
section - GTR.

b) The CSD shall meet the requirements of IEC-61000-4-16 class IV for HF

disturbance test (for short and long durations both) and fast transient
test shall be as per IEC-61000-4-4 level IV and insulation test as per IEC
60255–5.

c) The CSD shall have functions for switching ON & OFF the circuit
breakers.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 7 of 27
 d) The CSD shall get command to operate the breakers manually. The
controller shall be able to analyze the current and voltage waves available
through the signals from secondaries of CTs & CVTs for the purpose of
calculation of optimum moment of the switching the circuit breaker and
issue command to circuit breaker to operate.

e) The CSD shall also have an adaptive control feature to consider the next
operating time of the breaker in calculation of optimum time of issuing the
switching command. In calculation of next operating time of the breaker,
the CSD must consider all factors that may affect the operating time of the
breaker such as, but not limited to, ambient temperature, control voltage
variation, SF6 gas density variations etc. Schematic drawing for this
purpose shall be provided by the contractor. The accuracy of the operating
time estimation by the controller shall be better than ± 0.5 ms.

f) The CSD should have display facility at the front for the display of
settings and measured values.

g) The CSD shall be PC compatible for the setting of various parameters and
down loading of the settings and measured values, date, time of switching
etc. Window based software for this purpose shall be supplied by the
contractor to be used on the owner’s PC.

h) The controller shall be suitable for current input of 1 ampere from the
secondary of the CTs. and 110 V (Ph to Ph) from the CVTs. The CSD
shall withstand transient and dynamic state values of the current from the
secondary of the CTs and CVTs.

i) The CSD shall have time setting resolution of 0.1 ms or better.

j) The CSD shall have sufficient number of output/input potential free

contacts for connecting the monitoring equipment and annunciation
system available in the control room. Necessary details shall be worked
out during engineering of the scheme.

k) The CSD shall also record and monitor the switching operations and
make adjustments to the switching instants to optimize the switching
behavior as necessary. It shall provide self-diagnostic facilities,
signaling of alarms and enable downloading of data captured from
the switching events.

l) The provision for bypassing the Controlled switching device shall be

provided through BCU and SCADA both so that whenever, the CSD is
not healthy due to any reason (including auxiliary supply failure),
uncontrolled trip/close command can be extended to the circuit

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 8 of 27
 Breaker. Alternatively, in case of any non-operation of the CSD after
receiving a close/trip command after a pre-determined time delay, the
CSD should automatically be bypassed so as to ensure that the trip and
close commands are extended to the Trip/Close coils through subsequent
command.

m) The CSD shall be provided with a communication port to facilitate

online communication of the CSD with Substation automation system
directly on IEC 61850 protocols. If the CSD does not meet the
protocols of IEC 61850, suitable gateway shall be provided to enable
the communication of CSD as per IEC 61850.

3.0 TOTAL BREAK TIME

3.1 The total break time as specified under this section shall not be exceeded
under any of the following duties:

i) Test duties T10, T30, T60, T100a, and T100s (with TRV as per IEC:
62271-100)

ii) Short line fault L75, L90 (with TRV as per IEC: 62271-100)

3.2 The total break time of the breaker shall not be exceeded under any duty
conditions specified such as with the combined variation of the trip coil
voltage (70-110%), arc extinguishing medium pressure etc. While furnishing
the proof of the total break time of complete circuit breaker, the effect of non-
simultaneity between contacts within a pole or between poles shall be
brought out to establish guaranteed total break time.

3.3 The values guaranteed shall be supported with the type test reports.

4.0 CONSTRUCTIONAL FEATURES

The features and constructional details of circuit breakers shall be in

accordance with requirements stated hereunder:

4.1 Contacts

4.1.1 The gap between the open contacts shall be such that it can withstand at least
the rated phase to ground voltage for 8 hours at zero gauge pressure of SF6
gas due to the leakage. The breaker should be able to withstand all dielectric
stresses imposed on it in open condition at lock out pressure continuously (i.e.
2 p.u. across the breaker continuously, for validation of which a power
frequency dielectric with stand test conducted for a duration of at least 15
minutes is acceptable).

4.2 If multi-break interrupters are used, these shall be so designed and augmented
that a uniform voltage distribution is developed across them. Calculations/

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 9 of 27
 test reports in support of the same shall be furnished. The thermal and voltage
withstand rating of the grading elements shall be adequate for the service
conditions and duty specified.

4.3 The SF6 Circuit Breaker shall meet the following additional requirements:

a) The circuit breaker shall be single pressure type. The design and
construction of the circuit breaker shall be such that there is a minimum
possibility of gas leakage and entry of moisture. There should not be
any condensation of SF6 gas on the internal insulating surfaces of the
circuit breaker.

b) All gasketted surfaces shall be smooth, straight and reinforced, if

necessary, to minimise distortion and to make a tight seal, the operating
rod connecting the operating mechanism to the arc chamber (SF6
media) shall have adequate seals. The SF6 gas leakage should not
exceed 0.5% per year and the leakage rate shall be guaranteed during
the warrantee period. In case the leakage under the specified
conditions is found to be greater than 0.5% per year after
commissioning of circuit breaker during the warrantee period, the
manufacturer will have to supply free of cost, the total gas requirement
for subsequent ten (10) years, based on actual leakage observed during
the warrantee period.

c) In the interrupter assembly there shall be an absorbing product box to

minimise the effect of SF6 decomposition products and moisture. The
material used in the construction of the circuit breakers shall be fully
compatible with SF6 gas decomposition products.

d) Each pole shall form an enclosure filled with SF6 gas independent of
two other poles (for 800, 420 & 245 kV CBs) and the SF6 density of
each pole shall be monitored individually. For CBs of voltage class of
145 kV or less, a common SF6 scheme/density monitor shall be
acceptable.

e) The dial type SF6 density monitor shall be adequately temperature

compensated to model the pressure changes due to variations in ambient
temperature within the body of circuit breaker as a whole. Separate
density monitor and dial type temperature compensated pressure
guage is also acceptable. The density monitor shall have graduated
scale and it shall be possible to dismantle the density monitor for
checking/replacement without draining the SF6 gas by providing
suitable interlocked non return valve coupling.

f) Circuit Breaker shall be capable of withstanding a vacuum of minimum

8 millibars without distortion or failure of any part.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 10 of 27
 g) Sufficient SF6 gas (including that will be required for gas analysis
during filling) shall be provided to fill all the circuit breakers being
supplied. Spare gas shall be supplied in separate unused cylinders as
per requirement specified in BPS.

4.4 Provisions shall be made for attaching an operational analyser to record

contact travel, speed and making measurement of operating timings, pre
insertion timings of closing resisters if used, synchronisation of contacts in
one pole.

4.5 The CO (Close-open) operation and its timing shall be such as to ensure
complete travel/insertion of the contact during closing operation and
then follow the opening operation.

5.0 SULPHUR HEXAFLUORIDE GAS (SF6 GAS)

a) The SF6 gas shall comply with IEC 60376 and shall be suitable in all
respects for use in the switchgear under the operating conditions.

b) The high pressure cylinders in which the SF6 gas is shipped and stored
at site shall comply with requirements of the relevant standards and
regulations. SF6 gas shall be supplied (in returnable cylinders) for
all circuit breakers. However, SF6 gas for spare circuit breakers
and mandatory spare quantity of SF6 gas shall be supplied in non-
returnable cylinders.

c) Test: SF6 gas shall be tested for purity, dew point, air, hydro-soluble
fluorides and water content as per IEC 60376 and test certificates shall
be furnished to Employer indicating all the tests as per IEC 60376 for
each lot of SF6 gas and Material safety datasheet shall be provided. Gas
bottles should be checked for leakage during receipt at site.

6.0 INSULATORS

a) The porcelain/polymer of the insulators shall conform to the

requirements stipulated under Section-GTR.

b) The mechanical characteristics of insulators shall match with the

requirements specified under this section.

c) All porcelain & polymer hollow column insulators shall conform to

IEC-62155 & IEC-61462 respectively.

d) Hollow Porcelain/polymer for pressurised columns/chambers should be

in one integral piece in green and fired stage.

7.0 SPARE PARTS AND MAINTENANCE EQUIPMENT

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 11 of 27
 The bidder shall include in his proposal, spare parts and maintenance
equipment in accordance with BPS. Calibration certificates of each
maintenance equipment shall be supplied along with the equipment.

8.0 OPERATING MECHANISM AND CONTROL

8.1 General Requirements

8.1.1 Circuit breaker shall be operated by spring charged mechanism. The

mechanism box shall meet the requirements of IP-55.

8.1.2 The operating mechanism box shall be strong, rigid, rebound free and shall
be readily accessible for maintenance.

8.1.3 The mechanism shall be anti-pumping and trip free under every method of
closing.

8.1.4 The mechanism shall be such that the failure of any auxiliary spring will not
prevent tripping and will not cause unwanted trip or closing operation of the
Circuit Breaker

8.1.5 A mechanical indicator shall be provided to show open and close position of
the breaker. It shall be located in a position where it will be visible to a man
standing on the ground level with the mechanism housing closed. An
operation counter shall also be provided in the common marshalling box.

8.1.6 Working parts of the mechanism shall be of corrosion resisting material,

bearings which require grease shall be equipped with pressure type grease
fittings. Bearing pin, bolts, nuts and other parts shall be adequately pinned or
locked to prevent loosening or changing adjustment with repeated operation
of the breaker.

8.1.7 The contractor shall furnish detailed operation and maintenance manual of
the mechanism alongwith the operation manual for the circuit breaker. The
instruction manuals shall contain exploded diagrams with complete storage,
handling, erection, commissioning, troubleshooting, servicing and
overhauling instructions.

8.1.8 Size of common marshalling Box shall be such that adequate space is
available for working in the panel and all wiring shall be routed through
non-inflammable wire troughs with covers.

8.1.9 Space shall be available in 765kV CB common marshalling box to mount

monitoring device, of about 300x300x150mm size and of approximately
7kg weight, by the owner in future.

8.1.10 Operating mechanism and Marshalling box should be provided with

space heater with thermostat, CFL/LED lamp and AC point /Socket.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 12 of 27
8.2 Control:

8.2.1 The close and trip circuits shall be designed to permit use of momentary
contact switches and push buttons.

8.2.2 Each breaker shall be provided with two (2) independent tripping circuits,
pressure switches and coils each to be fed from separate DC sources.

8.2.3 The breaker shall normally be operated by remote electrical control.

Electrical tripping shall be performed by shunt trip coils. However,
provisions shall be made for local electrical control. For this purpose a
local/remote selector switch and close and trip control switch/push buttons
shall be provided in the Breaker common marshalling box.

8.2.4 The trip coils shall be suitable for trip circuit supervision during both open
and close position of breaker.

8.2.5 Closing coil and associated circuits shall operate correctly at all values of
voltage between 85% and 110% of the rated voltage. Shunt trip coil and
associated circuits shall operate correctly under all operating conditions of the
circuit breaker up to the rated breaking capacity of the circuit breaker and at
all values of supply voltage between 70% and 110% of rated voltage.
However, even at 50% of rated voltage the breaker shall be able to open. If
additional elements are introduced in the trip coil circuit their successful
operation and reliability for similar applications on outdoor circuit breakers
shall be clearly brought out during detailed engineering.

8.2.6 The 765kV kV, 3-Phase circuit breakers suitable for single phase
switching shall be suitable for taking a spare pole into service in case of
any operational requirement and their marshalling box shall be suitable
for accommodating the additional relays etc. required for changeover
arrangement of all contacts, alarms, signals, indications, interlocks and
lockouts.

8.2.7 In trip and closing circuits, relays/relay contacts shall preferably be used
instead of contactors.

8.2.8 Controlled switching scheme/device, wherever required shall be

considered as integral part of CB and shall be commissioned along with
CB.

8.2.9 Density Monitor contacts and pressure switch contacts shall be preferably
suitable for direct use as permissive in closing and tripping circuits. The
devices shall provide continuous & automatic monitoring of the state of
the gas as follows:

a) 'Gas Refill' level

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 13 of 27
 This contact will be used for remote indication/ to annunciate the need
for gas refilling.

b) ‘SF6 gas density Low’ Alarm level - 1

This contact will be used for remote indication/ to annunciate the need
for the urgent gas refilling.

c) ‘SF6 gas density Low’ Alarm level - 2

This contact will be used to annunciate the need for gas refilling under
emergency or trip the Circuit Breaker.

d) 'Breaker Block' level

This is the minimum gas density at which the manufacturer will
guarantee the rated fault interrupting capability of the breaker. At this
level the breaker block contact shall operate & the tripping & closing
circuit shall be blocked.

It shall be possible to test all gas monitoring relays/devices without de-

energizing the primary equipment & without reducing pressure in the
main section. Plugs & sockets shall be used for test purposes. It shall also
damp the pressure pulsation while filling the gas in service, so that
flickering of the pressure switch contacts does not take place.

The density monitor shall be placed suitably inclined in such a way so that the
readings are visible from ground level with or without using binoculars.
Separate contacts have to be used for each of tripping and closing circuits. If
contacts are not suitably rated and multiplying relays are used then fail safe
logic/schemes are to be employed. DC supplies for all auxiliary circuits shall
be monitored and provision shall be made for remote annunciations and
operation lockout in case of D.C. failures. Density monitors are to be so
mounted that the contacts do not change on vibration during operation of
circuit Breaker.

8.2.10 The auxiliary switch of the breaker shall be positively driven by the breaker
operating rod.

8.3 Spring operated mechanism:

a) Spring operated mechanism shall be complete with motor as per

manufacturer practice. Opening spring and closing spring with limit
switch for automatic charging and other necessary accessories to make
the mechanism a complete operating unit shall also be provided.

b) As long as power is available to the motor, a continuous sequence of

the closing and opening operations shall be possible. The motor shall
have adequate thermal rating for this duty.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 14 of 27
 c) After failure of power supply to the motor one close open operation
shall be possible with the energy contained in the operating mechanism.

d) Breaker operation shall be independent of the motor which shall be

used solely for compressing the closing spring. Facility for manual
charging of the closing spring shall also be provided. The motor rating
shall be such that it requires not more than 30 seconds for full charging
of the closing spring.

e) Closing action of circuit breaker shall compress the opening spring

ready for tripping.

f) When closing springs are discharged after closing a breaker, closing

springs shall be automatically charged for the next operation and an
indication of this shall be provided in the local and remote control
cabinet.

g) Provisions shall be made to prevent a closing operation of the breaker

when the spring is in the partial charged condition. Mechanical
interlocks shall be provided in the operating mechanism to prevent
discharging of closing springs when the breaker is already in the closed
position.

h) The spring operating mechanism shall have adequate energy stored in

the operating spring to close and latch the circuit breaker against the
rated making current and also to provide the required energy for the
tripping mechanism in case the tripping energy is derived from the
operating mechanism.

i) The spring charging failure alarm shall be provided with a time

delay relay having setting range from 0-1minute.

j) Separate MCBs shall be provided for each spring charging motor

and the rating of MCBs shall be suitably selected to match the
starting, running and stalling time.

k) An overload relay shall be provided for protection of the spring

charging motor.

9.0 SUPPORT STRUCTURE

a) The structure design shall be such that during operation of circuit

breaker vibrations are reduced to minimum.

b) Ladder and Maintenance platform for 400kV and 765kV Circuit

breaker:

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 15 of 27
 A suitable ladder with the safety cage and a free standing
maintenance platform with railing for each pole of the circuit
breaker shall be supplied along with the equipment and it’s support
structure. The platform shall be suitable for maintenance personnel
to stand and carryout the activities along with the tools and plant.
The ladder cum maintenance platform shall be designed as a free
standing structure without taking any support from the main
circuit breaker structure. The ladder having height more than 3.0m
shall have at least 15 degree slope and is to be provided with safety
guard above 2.0m level. All structural steel for the platform shall
be as per IS: 2062 and to be galvanized. An indicative drawing of
ladder and platform (Drg.Ref.: C-ENGG-IND.DWG-PLATFORM-
CB, Rev.0) is added at page 27 of 27 with this specification for
guidance which may be modified to suit the requirement of CB by
CB manufacturer. However, the minimum size of the structural
members shall be maintained as mentioned in the drawing.

c) For 220kV, 132kV & 66kV circuit breakers a suitable platform cum
ladder shall be provided as per manufacturer design.

10.0 TERMINAL CONNECTOR PAD

The circuit breaker terminal pads shall be made up of high quality electrolytic
copper or aluminium and shall be conforming to Australian Standard AS-
2935 or equivalent standard for rated current. The terminal pad shall have
protective covers which shall be removed before interconnections.

11.0 INTER-POLE CABLING

11.1 All cables to be used by contractor shall be armoured and shall be as per IS –
1554/ IEC-60502 (1100 Volts Grade). All cables within & between circuit
breaker poles and its marshaling box and up to the controlled switching
device is included in the scope of work. Special cables like screened cable if
required for Circuit Breaker, temperature Transducer/CB Status Signals
for CSD and its associated C&R panel shall be laid in 50mm diameter PVC
pipe. Suitable supports for PVC pipe shall be included in the scope of Supply.

11.2 Only stranded conductor shall be used. Minimum size of the conductor for
inter-pole control wiring shall be 1.5 sq.mm. Copper.

11.3 The cables shall be with oxygen index Minimum 29 and temperature index as
250oC as per relevant standards.

11.4 Separate cables shall be used for AC, DC-I, DC-II and selected DC.

11.5 All inter-pole cabling of Circuit breakers and up to common marshalling

box shall be done by plug-in type arrangement. Suitable removable type

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 16 of 27
 encasing cover shall be provided in case plug-in type connection
arrangement is provided exterior side of LCC/MB. The plug-in type
cable termination shall be conforming to IP-67 as per IEC60529. Cable
sealing arrangement shall be provided (as per requirement) to avoid
entry of moisture etc.

11.6 Vertical run of cables to the operating mechanism box shall be properly
supported by providing the perforated closed type galvanized cable tray
(Cable tray also to be supplied along with the Circuit Breaker) to be
fixed as an integral part of the structures. The load of the cable shall not
be transferred to the mechanism box/plug-in type terminal arrangement
in any circumstances. Hanging or loose run of cable is not permitted.
The drawing of cable tray including fixing arrangement shall be
incorporated in the GA drawing of CB also.

11.7 Wiring shall be done with stud type terminals and ring type lugs. More than
two wires shall not be connected on each side of terminal.

12.0 FITTINGS AND ACCESSORIES

12.1 Following is list of some of the major fittings and accessories to be furnished
by Contractor in the common marshalling box. Number and exact location
of these parts shall be indicated in the drawing.

i) Cable glands (Double compression type), Lugs, Ferrules etc.

ii) Local/remote changeover switch.

iii) Operation counter

iv) Control switches to cut off control power supply.

v) Fuses/MCBs as required.

vi) The number of terminals provided shall be adequate enough to wire out
all contacts and control circuits plus 24 terminals spare for future use.

vii) Anti-pumping relay.

viii) Pole discrepancy relay (for electrically ganged CBs).

ix) D.C. Supervision relays.

x) Rating plate description in accordance with IEC incorporating year of

manufacture.

xi) Controlled switching accessories like sensors, timers, relays etc.(as

applicable)

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 17 of 27
 xii) Transducers/Fixtures required for travel measurement shall be
supplied by CB manufacturer. The complete set of
Transducers/Fixtures for measurement of complete 3-phase CB
shall be supplied for each station. Further, one set of gas filling
adopter (Including coupling, regulator, connecting hose pipe up to
ground level) shall be supplied as per BPS.

13.0 ADDITIONAL DATA TO BE FURNISHED

a) Drawing, showing contacts in close, arc initiation, full arcing, arc

extinction and open position.

b) The temperature v/s pressure curves for each setting of density monitor
along with details of density monitor.

c) Method of checking the healthiness of voltage distribution devices

(condensers) provided across the breaks at site.

d) Data on capabilities of circuit breakers in terms of time and number of

operations at duties ranging from 100% fault currents to load currents
of the lowest possible value without requiring any maintenance or
checks.

e) Maximum non-simultaneity between contacts, between poles and

effect of the same on the guaranteed total break time.

f) Sectional view of non-return couplings used for SF6 pipes.

g) Details & type of filters used in interrupter assembly and also the
operating experience with such filters.

h) Details of SF6 gas:

i) The test methods used in controlling the quality of gas used in the
circuit breakers particularly purity and moisture content.

ii) Proposed tests to assess the conditions of the SF6 within a circuit
breaker after a period of service particularly with regard to
moisture contents of the gas.

j) Shall furnish curves supported by test data indicating the opening time
under close open operation with combined variation of trip coil voltage.

k) Detailed literature and schematic diagrams of switching mechanism for

closing resistor showing the duration of insertion shall also be furnished
alongwith the calculations in respect of thermal rating of resistors for
the duties specified under clause 2.2.1 of this section in case of 420 kV
& 800kV circuit breakers.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 18 of 27
 l) All duty requirements as applicable to 800 kV, 420 kV, 245 kV, 145 kV
& 72.5kV CBs specified under Clause 2.0 of this section shall be
provided with the support of adequate test reports.

14.0 DEAD TANK TYPE CIRCUIT BREAKER

14.1 In case dead tank type circuit breaker is offered, the Bidder shall offer
bushing type CTs (whose secondary parameters are given in under Section:
Switchgear-Instrument Transformer and in case of 765kV and 400kV
these secondaries shall be provided in sets of 3 cores, i.e., 2 cores of PX class
and one core of metering, on both sides of dead tank circuit breaker instead of
conventional outdoor CTs.

14.2 The enclosure shall be made of either Al/Al Alloy or mild steel (suitably hot
dip galvanized). The enclosure shall be designed for the mechanical and
thermal loads to which it is subjected in service. The enclosure shall be
manufactured and tested according to the pressure vessel codes {i.e., latest
edition of the ASME code for pressure vessel - Section VIII of BS-5179,
IS4379, IS-7311 (as applicable) and also shall meet Indian Boiler
Regulations}.

The maximum temperature of enclosure with CB breaker carrying full load

current shall not exceed the ambient by more than 20 deg C.

14.3 The enclosure has to be tested as a routine test at 1.5 times the design
pressure for one minute. A bursting pressure test shall be carried out at 5
times the design pressure as type test on the enclosure.

15.0 TESTS

15.1 In accordance with the requirements stipulated under Section-GTR the circuit
breaker alongwith its operating mechanism shall conform to the type tests as
per IEC: 62271-100.

15.2 The type test reports as per IEC and the following additional type test reports
shall also be submitted for purchaser’s/employer’s review:

i) Corona extinction voltage test (procedure as per Annexure-A of

Section-GTR).

ii) Out of phase closing test as per IEC: 62271-100.

iii) Line charging interrupting current for proving parameters as per clause
no. 16.0 of this section.

iv) Test to demonstrate the Power Frequency withstand capability of

breaker in open condition at Zero Gauge pressure and at lockout
pressure (Ref. Clause 4.1.1).

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 19 of 27
 v) Seismic withstand test (procedure as per Annexure-B of Section-GTR)
in unpressurised condition.

vi) Verification of the degree of protection.

vii) Low temperature test (applicable only for minimum ambient

temperatures of less than (-) 10 deg.C application purpose) and
High temperature test. Contractor can also submit the field
performance report in line with IEC stipulations.

viii) Static Terminal Load test.

ix) Critical Currents test (if applicable).

x) Switching of Shunt Reactors. Test reports shall be submitted as per

IEC. Calculations shall be submitted for meeting the
requirements of clause 2.3(v) of this section.

xi) Circuit breakers meant for controlled switching shall conform to

requirements of IEC/TR-62271 – 302. The contractor shall submit
test reports to demonstrate that the offered CB conforms to the
requirements of performance verification tests and parameter
definition tests as per IEC/TR 62271-302. The contractor shall
also furnish the report for the re-ignition free arcing window for
switching 3-phase shunt reactor as demonstrated in the shunt
reactor switching test.

15.3 Routine Tests

Routine tests as per IEC:62271-100 shall be performed on all circuit breakers.

In addition to the mechanical and electrical tests specified by IEC, the

following tests shall also be performed.

i) Speed curves for each breaker shall be obtained with the help of a
suitable operation analyzer to determine the breaker contact movement
during opening, closing, auto reclosing and trip free operation under
normal as well as limiting operating control voltage conditions. The
tests shall show the speed of contacts directly at various stages of
operation, travel of contacts, opening time, closing time, shortest time
between separation and meeting of contacts at break make operation
etc. This test shall also be performed at site for which the necessary
operation analyzer along with necessary transducers, cables, console
etc. shall be arranged by the contractor at his own cost.

ii) During testing of CB, dynamic contact resistance measurement

(DCRM) shall be carried out for close-open (CO) operations with
delay of 300ms between close and trip operations. Minimum 100A

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 20 of 27
 current shall be injected for DCRM test. Travel characteristics,
injected current, trip/close coil current shall also be recorded along
with DCRM test.

iii) Routine tests on Circuit breakers with Controlled switching device

as per IEC/TR 62271-302.

iv) Tan delta and Capacitance measurement for grading capacitors at

rated voltage and also at 10kV (for reference).

16.0 TECHNICAL PARAMETERS FOR CIRCUIT BREAKER

(In addition to those indicated in section-GTR)

Sl. Parameter 765kV 400kV 220kV 132 kV 66 kV

no. system system system system system
1. Rated voltage (Umax) 800 420 245 145 72.5
kV (rms)
2. Rated frequency (Hz) 50 50 50 50 50
3. No. of poles 3 3 3 3 3
4. Type of circuit breaker SF6 gas SF6 gas SF6 gas SF6 gas SF6 gas
insulated insulated insulated insulated insulated
5. Rated continuous current 3150/4000 2000/3150/ 1600/2500 1250 1250
(A) at an ambient 4000 (as
temperature of 500C (as applicable)
applicable)
6. Rated short circuit capacity 50kA 40/50/63kA 40/50 kA 31.5kA 25kA
with percentage of DC (As (As ( As
component as per IEC- applicable) applicable ) applicable )
62271-100 corresponding
to minimum opening time
under operating conditions
specified.
7. Symmetrical interrupting 50 40/50/63 (As 40/50 (As 31.5 25
capability kA (rms) applicable) applicable)
8. Rated short circuit making 125 100/125/ 100/125 80 63
current kAp 157.5 (As (As
applicable) applicable)
9. Short time current carrying 50 40/50/63 40/50 31.5 25
capability kA (rms) for one As applicable As for one for three
second for one applicable second second
second for one
second
10. Out of phase breaking 12.5 10/12.5/15.75 As per IEC As per IEC As per
current carrying capability (As IEC
kA (rms) applicable)
11. Rated line charging 900 600 As per IEC As per IEC As per IEC
interrupting current at 90
deg. Leading power factor
angle (A rms) (The breaker
shall be able to interrupt
the rated line charging
current with test voltage
immediately before

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 21 of 27
 opening equal to the
product of U/√3 and 1.4 as
per IEC-62271-100
12. First pole to clear factor 1.3 1.3 1.3 1.3 1.5
13. Temperature rise over an As per IEC: As per IEC: As per IEC: As per IEC: As per
ambient temperature of 62271-100 62271-100 62271-100 62271-100 IEC:
500C 62271-100
14. Rated break time as IEC 40 40 60 60 Less than
(ms) 75

15. Total break time (ms) 45 45 65 65 Less than

80
16. Total closing time (ms) Not more Not more Not more Not more Not more
than 150 than 150 than 150 than 150 than 150
17. Operating mechanism or a Spring Spring Spring Spring Spring
combination of these
18. Rated operating duty cycle O-0.3s-CO- O-0.3s-CO-3 O-0.3s-CO- O-0.3s-CO- O-0.3s-CO-
3 min-CO min-CO 3 min-CO 3 min-CO 3 min-CO
19. Reclosing Single phase Single phase Single phase Three phase Three
&Three &Three phase &Three auto phase auto
phase auto auto phase auto reclosing. reclosing.
reclosing. reclosing. reclosing. (Single
phase auto
reclosing if
specified in
section-
project)
20. Pre-insertion resistor As per BPS As per BPS NA NA NA
requirement

i) Rating (ohms) 450(max.) 400(max.) NA NA NA

with with
tolerance as tolerance as
applicable applicable

ii) Minimum electrical 9 8 NA NA NA

(mechanical insertion time
+pre-arcing time) pre-
insertion time (ms)

iii) Opening of PIR contacts PIR contacts PIR contacts NA NA NA

should open should open
immediately immediately
after closing after closing
of main of main
contacts contacts
OR OR
At least 5 At least 5 ms
ms prior to prior to
opening of opening of
main main contacts
contacts at at rated
rated air/gas air/gas
pressure pressure
where the where the

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 22 of 27
 PIR contacts PIR contacts
remain remain closed
closed
21. Max. difference in the 2.5(within a 2.5(within a 3.3(opening) 3.3(opening) As per IEC
instants of closing/opening pole) pole) 5.0(closing) 3.3(closing)
of contacts (ms) between 3.3(opening) 3.3(opening)
poles at rated control 5.0(closing) 5.0(closing)
voltage and rated operating
& quenching media
pressures
22. Maximum allowable 1.9 p.u. 2.3 p.u. As per IEC As per IEC As per IEC
switching over voltage
under any switching
condition
23. Trip coil and closing coil 220V DC 220V DC 220V DC 220V DC 220V DC
voltage with variation as or 110V DC or 110V
specified DC
24. Noise level at base and up As per IEC 140dB 140dB 140dB 140dB
to 50 m distance from base (max.) (max.) (max.) (max.)
of circuit breaker
25. Rating of Auxiliary 10A at 10A at 10A at 10A at 10A at
contacts 220V DC 220V DC 220V DC 220V DC 220V DC
26. Breaking capacity of Aux. 2A DC with 2A DC with 2A DC with 2A DC with 2A DC
Contacts circuit time circuit time circuit time circuit time with circuit
constant not constant not constant not constant not time
less than less than less than less than constant
20ms 20ms 20ms 20ms not less
than 20ms
27. Rated insulation levels
i) Full wave impulse ±2100kVp ±1425 kVp ±1050 kVp ±650 kVp ±325 kVp
withstand (1.2 /50 µs)
between line terminals and
ground
ii) Full wave impulse 2100kVp 1425 kVp ±1050 kVp + 650kVp ±325 kVp
withstand (1.2 /50 µs) impulse on impulse on
between terminals with one terminal one terminal
circuit breaker open & 455 kVp & 240 kVp
power power
frequency frequency
voltage of voltage of
opposite opposite
polarity on polarity on
the other the other
terminal terminal
iii) Rated switching impulse + 1550kVp +1050 kVp NA NA NA
withstand voltage
(250/2500 µs) Dry & wet
between line terminals and
ground .
iv) Rated switching impulse 1175kVp 900 kVp NA NA NA
withstand voltage impulse on impulse on
(250/2500 µs) Dry &wet one terminal one terminal
Between terminals with & 650 kVp & 345 kVp
circuit breaker open power power
frequency frequency

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 23 of 27
 voltage of voltage of
opposite opposite
polarity on polarity on
the other the other
terminal terminal
v) One minute power 830kV rms 520 kV rms. 460 kV rms. 275 kV rms 140 kV
frequency dry withstand rms
voltage between line
terminals and ground
vi) One minute power 1150kV rms 610 kV rms. 460 kV rms. 275 kV rms 160 kV
frequency dry withstand rms
voltage between terminals
with circuit breaker open
28. Minimum corona 508 kV rms 320kV rms 156 kV rms 92 kV rms NA
extinction voltage with CB
in all positions
29. Max. radio interference 2500 µV 1000 µV 1000 µV 500µV NA
voltage for frequency (at 508kV (at 266kV (at 156kV (at 92kV
between 0.5 MHz and 2 rms) rms) rms) rms)
MHz (Micro volts)
30. Minimum Creepage
distance*
i) Phase to ground 20000mm 10500mm 6125mm 3625mm 1813mm
(25mm/kV)
ii) Between CB terminals 18000mm 10500mm 6125mm 3625mm 1813mm
31. System neutral earthing Effectively earthed
32. Rated terminal load As per IEC or as per the value calculated based on specific switchyard
layout requirement, whichever is higher.
33. Auxiliary contacts Besides requirement of technical specification, the manufacturer/contractor
shall wire up 10 NO + 10 NC contacts exclusively for purchaser’s use and
wired up to common marshalling box.
34. No. of terminals in All contacts & control circuits to be wired out up to common marshalling
common marshalling box box + minimum 24 terminals exclusively for purchaser’s future use
35. Seismic level 0.5g horizontal for the site location under the Zone-V as per IS-1893
0.3g horizontal for the site location under other than the Zone-V as per IS-
1893

* The values indicated are for specific creepage of 25mm/kV. In case of specific
creepage of 31mm/kV specified, the Minimum Creepage distance values shall be
concidered proportionately.

17.0 PRE-COMMISSIONING TESTS

17.1 An indicative list of tests is given below. All routine tests except power frequency
voltage dry withstand test on main circuit breaker shall be repeated on the
completely assembled breaker at site. For Pre-commissioning tests, procedures
and formats for circuit breakers, POWERGRID document no. CF/CB/03/R-4
dated 01/04/2013 of document no. D-2-01-03-01-04 dated 01-04-2013 will be the
reference document. This document will be available at respective sites and shall
be referred by the contractor. Contractor shall perform any additional test based
on specialties of the items as per the field Q.P./instructions of the equipment
Supplier or Employer without any extra cost to the Employer. The Contractor

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 24 of 27
 shall arrange all instruments required for conducting these tests alongwith
calibration certificates and shall furnish the list of instruments to the Employer for
approval.

(a) Insulation resistance of each pole.

(b) Check adjustments, if any suggested by manufacturer.

(c) Breaker closing and opening time.

(d) Slow and Power closing operation and opening.

(e) Trip free and anti pumping operation.

(f) Minimum pick-up voltage of coils.

(g) Dynamic Contact resistance measurement.

(h) Functional checking of control circuits interlocks, tripping through

protective relays and auto reclose operation.

(i) Insulation resistance of control circuits, motor etc.

(j) Resistance of closing and tripping coils.

(k) SF6 gas leakage check.

(l) Dew Point Measurement

(m) Operation check of pressure switches and gas density monitor during
gas filling.

(n) Checking of mechanical ‘CLOSE’ interlock, wherever applicable.

(o) Testing of grading capacitor.

(p) Resistance measurement of main circuit.

(q) Checking of operating mechanisms

(r) Check for annunciations in control room.

(s) Point of wave switching test (wherever applicable)

17.2 The contractor shall ensure that erection, testing and commissioning of circuit
breaker shall be carried out under the supervision of the circuit breaker
manufacturer's representative. The commissioning report shall be signed by the
manufacturer’s representative.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 25 of 27
18.0 ACTIONS REQUIRED FOR DEFECTS OBSERVED DURING DEFECT
LIABILITY PERIOD

The actions required to be taken by contractor in case of defects observed in AIS type
Circuit Breakers of ratings 132kV & above during the warranty period (defect liability
period) shall be as per following. Further, the replaced/repaired/ refurbished equipment
(or part of equipment) shall have warranty in line with the GCC clause 22 in SCC.

Sl.no. Nature of problem Corrective measures to be taken by

contractor
1. Blasting of interrupter, PIR, pole column, Replacement of compete CB pole
Including SF6 gas
a. Abnormal DCRM and Travel Measurement Repair/replacement of affected assembly/
b. Contact assembly and internal component component based on repair procedure
damage, misalignment not leading to approved by QA
complete failure of interrupter/ PIR
2. Crack in insulator, cementing joint of interrupter , Replacement of affected part
PIR , pole column
3. SF6 gas leakage from sealing and bolted joints. Rectification by replacement of gasket,
SF6 gas leakage detectable by any Leakage O-ring, sealing, Interrupter or affected
Detection Method part to be replaced etc
If unable to arrest the leakage in 02
attempts, replacement of interrupter/
column
4. SF6 gas low dew point: > (-)35 deg C at Re-conditioning of gas.
atmospheric pressure. If does not improve, complete evacuation
of CB, replacement filter material and
gas
5. Oil leakage of grading capacitor Replacement or Refurbishment of
Change in Capacitance value beyond +/- 5 % grading capacitor
w.r.t. to value of Capacitance obtained at site
during pre-commissioning test.
6. Pole/ break discrepancy (during O&M) Rectification/replacement of affected
Limits: parts
Break to Break (Opening/Closing) : max. 2.5 ms
Phase to Phase (Opening) : max. 3.33 ms
Phase to Phase (Closing) : max 5 ms
7. Static Contact Resistance: increase >50% from Rectification/Replacement of pole
factory/ pre-commissioning value or
>75 micro-ohm/ break whichever is lower
8. Drive mechanism assembly failure Rectification/ Replacement of affected
part
9. Trip/ close coil, density monitor, relays and Replacement of affected part
contactors and components of common MB

Note: 1) Replaced/Repaired/Refurbished Equipment (or part of equipment) shall

have 2 years warranty without prejudice to contractual warranty period.

2) The measurement at site shall be carried out as per POWERGRID

standard Pre-commissioning procedures as indicated in Technical
Specification.

Technical Specification, Section: Switchgear-CB, REV.11

C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 26 of 27
Technical Specification, Section: Switchgear-CB, REV.11
C/ENGG/SPEC/SWGR/CB, DEC-2016 Page 27 of 27
 MODEL TECHNICAL SPECIFICATION

SECTION-SWITCHGEAR-INST

(INSTRUMENT TRANSFORMERS)

(REV. NO. 11)

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 1 of 34
Following are the major changes made in the Technical specification, Section-
Switchgear-INST, Rev. 11:

Clause No. Major Modification

1. New IEC-61869 referred. IEC-60044 is superseded by IEC-61869
2. 245kV and above rating CT are acceptable with Polymer Insulator
3. Cantilever strength for 72.5kV Instrument Transformer specified
4. Live Tank CT shall be preferably of Bar primary design with SS
Bellow
5. Type test & Special test requirements mentioned in line with IEC-
61869
6. DGA sampling after commissioning elaborated
7. Requirement of Oil sampling device added
8. Defect liability clause added for actions required in case of defects
observed during warrantee period
9. Protection class of CT mentioned as “PX class” in line with IEC-
61869

Note: The above is the list of major changes with respect to previous revision (Rev. 10).
However, the bidders are advised to read the entire section/chapter for other changes and
quote accordingly.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 2 of 34
 SECTION-SWITCHGEAR–INST

INSTRUMENT TRANSFORMERS

CONTENTS
Clause.No. Description Page No.

1.0 General 4

2.0 Constructional Features 4

3.0 Current Transformers 6

4.0 Voltage Transformers 8

5.0 Terminal Connectors 9

6.0 Tests 10

7.0 Mandatory Spares 12

8.0 Technical Parameters 13

9.0 Pre-Commissioning tests 13

10.0 Defect Liability 14

Table-IA Requirements of 800 kV CVT 15

Table-IB Requirements of 420 kV VT 16
Table-IC Requirements of 245 kV VT 17
Table-ID Requirements of 145 kV VT 18
Table-IE Requirements of 72.5 kV VT 19
Table-IIA Requirements of 800 kV CT 20
Table-IIB Requirements of 420 kV CT 21
Table-IIC Requirements of 245 kV CT 22
Table-IID Requirements of 145 kV CT-800A 23
Table-IIE Requirements of 145 kV CT-600A 24
Table-IIF Requirements for 72.5 kV CT 25

Annexure-I Technical Parameters of CT 26

Annexure-II Technical Parameters of CVT/IVT 28
Annexure-III Wiring diagram for CT 30
Annexure-IV Wiring diagram for CVT 32
Annexure-V Actions required in case of defects observed
during the warrantee period 34

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 3 of 34
 SECTION-SWITCHGEAR-INST
INSTRUMENT TRANSFORMERS
1.0 GENERAL:
1.1 The instrument transformers and accessories shall conform to the latest
version of the standards specified below except to the extent explicitly
modified in this specification and shall be in accordance with the
requirements in Section-GTR.
Current Transformers (CT): IEC: 61869-1 & 61869-2 or IS: 2705 Part-1 to 4
Capacitive Voltage Transformers (CVT): IEC: 61869-1, 61869-5 & IEC-
60358 or IS-3156 Part-1 to 4
Inductive Voltage Transformers (IVT): IEC: 61869-1 & 61869-3 or IS-3156
Part-1 to 3
1.2 The instrument transformers shall be designed for use in geographic and
meteorological conditions as given in Section-GTR and Section-Project.

2.0 CONSTRUCTION FEATURES:

The features and constructional details of instrument transformers shall be in
accordance with requirements stipulated hereunder:
a) Instrument transformers of 800kV/420kV/245kV/145kV/72.5 kV class,
shall be oil filled/SF6 gas filled, suitable for outdoor service and upright
mounting on steel structures. 245kV, 420kV and 800kV CT shall be
with polymer insulator.
b) Bushings/Insulators shall conform to requirements stipulated in
Section-GTR. The bushing/insulator for CT shall be one piece without
any metallic flange joint.
c) Oil filling and drain plugs, oil sight glass shall be provided for CT &
IVT. Oil sight glass shall be provided for electromagnetic unit of CVT.
The Instrument transformer shall have cantilever strength of not less
than 500 kg, 500 kg, 350 kg, 350 kg and 250 kg respectively for
800kV, 420kV, 245kV, 145kV and 72.5kV Instrument Transformers.
For CVT/IVT with polymer housing, the cantilever strength shall not be
less than 150kg. Oil filling and drain plugs are not required for SF6 gas
filled CT/IVT.
d) Instruments transformers shall be hermetically sealed units. The details
of the arrangements made for the sealing of instrument transformers
shall be furnish during detailed engineering.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 4 of 34
 e) Polarity marks shall indelibly be marked on each instrument
transformer and at the lead terminals at the associated terminal block.

f) SF6 gas filled CT/IVT shall be provided with a suitable SF6 gas density
monitoring device, with NO/NC contacts to facilitate the remote
annunciation and tripping in case of SF6 gas leakage. Provisions shall
be made for online gas filling. Suitable rupture disc shall be provided to
prevent explosion.

g) The instrument transformers shall be complete with its terminal box

and a common marshalling box for a set of 3 instrument transformers.
h) The external surface of instrument transformer, if made of steel, shall
be hot dip galvanized or painted as per Section-GTR. External surface
of aluminum can have natural finish.
i) The impregnation details alongwith tests/checks to ensure successful
completion of impregnation cycle shall be furnished for approval.

2.2 Terminal box/Marshalling Box:

Terminal box/Marshalling Box shall conform to the requirements of Section-
GTR.

2.3 Insulating Oil/Gas:

a) Insulating oil to be used for instrument transformers shall be of EHV
grade and shall conform to IS-335/IEC-60296 (required for first
filling). Non–PCB based synthetic insulating oil conforming to IEC
60867 shall be used in the capacitor units of CVT.
b) The SF6 gas shall comply with IEC-60376, 60376A, 60376B & IEC-
60480 and shall be suitable in all respects for use in the switchgear
under operating conditions.
2.4 Name Plate:
Name plate shall conform to the requirements of IEC incorporating the year
of manufacture. The rated current & extended current rating in case of
current transformers and rated voltage, voltage factor & intermediate
voltage in case of voltage transformers shall be clearly indicated on the name
plate.

3.0 CURRENT TRANSFORMERS:

a) Current transformers shall have single primary either ring type or hair
pin type and suitably designed for bringing out the secondary terminals

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 5 of 34
 in a weather proof (IP-55) terminal box at the bottom. PF (Tan delta)
terminal for measurement of tan delta and capacitance of the unit shall
be provided. These secondary terminals shall be terminated to stud
type non disconnecting terminal blocks inside the terminal box.

In case of inverted type (Live Tank) current transformers, the

manufacturer shall meet following additional requirements:

(i) The primary conductor shall preferably be of bar type

meeting the desired characteristics.
(ii) The secondaries shall be totally encased in metallic shielding
providing a uniform equipotential surface for even electric field
distribution.
(ii) The lowest part of the insulation assembly i.e. insulation at neck
shall be properly secured to avoid any risk of damage due to
transportation stresses.
(iii) The upper part of insulation assembly resting on primary bar shall
be properly secured to avoid any damage during transportation
due to relative movement between insulation assembly & top
dome.
(iv) Bellows made of stainless steel shall be used at the top for
hermetic sealing of CT.
(v) Bidder/Manufacturer shall recommend whether any special
storage facility is required for spare CT.
b) Different ratios specified shall be achieved by secondary taps only and
primary reconnection shall not be accepted.
c) Core lamination shall be of cold rolled grain oriented silicon steel or
other equivalent alloys. µ metal or nano-crystalline core can also be
used for metering cores.
d) The expansion chamber at the top of the porcelain insulators should be
suitable for expansion of oil.
e) Facilities shall be provided at terminal blocks in the marshalling box for
star delta formation, short circuiting and grounding of CT secondary
terminals.
f) Current Transformer’s guaranteed burdens and accuracy class are to be
intended as simultaneous for all cores.

g) The rated extended currents for 800kV and 420kV class Current
transformers shall be as given below:

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 6 of 34
 800kV, 3000A 400kV, 3000A
Tap Ratio
Rated extended currents in % of rated current
500/1 200 200

1000/1 --- ---

2000/1 180 180

3000/1 120 (200 for 15 min) 120

h) The secondary winding shall be rated for 2A continuously.

Further, the intermediate tapping at 3000-2000 of metering core of

3000 A rated 400kV and 800kV CTs shall be suitable for using as
1000/1 ratio also. The Auxiliary reactor, if used, as referred at wiring
diagram No.0000-000-T-E-L-028 shall be suitable for connecting to the
selected taps. The requirements of 3000A CTs are given at TABLE II-
A.
For 245/145/72.5kV class CTs, the rated extended primary current shall
be 120% (or 150% if applicable) on all cores of the CTs.
h) For 800/420/245/145/72.5kV Current Transformer, characteristics shall
be such as to provide satisfactory performance of burdens ranging from
25% to 100% of rated burden over a range of 5% to 120% (or specified
rated extended current whichever is higher) of rated current in case of
metering CTs and up to the accuracy limit factor/knee point voltage in
case of relaying CTs.
i) The current transformer shall be suitable for horizontal transportation.
It shall be ensured that the CT is able to withstand all the stresses
imposed on it while transporting and there shall be no damage in transit.
The Contractor shall submit the details of packing and transportation
design to the Employer for review.

j) For 800kV CTs, the instrument security factor at all ratios shall be less
than ten (10) for metering core. For 420/245/145/72.5kV CTs, the
instrument security factor at all ratios shall be less than five (5) for
metering core. If any auxiliary CTs/reactor are used in the current
transformers then all parameters specified shall have to be met treating
auxiliary CTs as an integral part of the current transformer. The
auxiliary CTs/reactor shall preferably be inbuilt construction of the
CTs. In case these are to be mounted separately these shall be mounted
in the central marshalling box suitably wired upto the terminal blocks.

k) The wiring diagram plate for the interconnections of the three single
phase CTs shall be provided inside the marshalling box. A typical

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 7 of 34
 wiring diagram no. 0000-000-T-E-L-028 (Sh.1 & 2) is enclosed
herewith at Annexure-III of this specification.
l) The Current Transformers should be suitable for mounting on lattice
structure (for 800 kV) or pipe structure (for 420 kV and below) to be
provided by the Contractor in accordance with stipulations of Section-
Project/Section-Structures.
m) The CT shall be designed so as to achieve the minimum risks of
explosion in service. Bidder/Manufacturer shall bring out in his offer,
the measures taken to achieve this.
n) 800/420/245/145kV Current Transformers shall be suitable for high
speed auto reclosing.

4.0 VOLTAGE TRANSFORMERS:

a) 800/420/245/145kV Voltage Transformers shall be capacitor voltage
divider type with electromagnetic units and shall be suitable for carrier
coupling.
b) Voltage transformers secondaries shall be protected by HRC cartridge
type fuses or MCBs for all the windings. In addition, fuses/MCBs shall
be provided for the protection and metering windings for fuse monitor-
ing scheme. The secondary terminals of the VTs shall be terminated to
the stud type non-disconnecting terminal blocks in the individual phase
secondary boxes via the fuse/MCBs.
c) CVTs shall be suitable for high frequency (HF) coupling required for
power line carrier communication. Carrier signal must be prevented
from flowing into potential transformer (EMU) circuit by means of a
RF choke/reactor suitable for effectively blocking the carrier signals
over the entire carrier frequency range i.e. 40 to 500 KHz. H.F.
terminal of the CVT shall be brought out through a suitable bushing and
shall be easily accessible for connection to the coupling filters of the
carrier communication equipment, when utilized. Further, earthing link
with fastener to be provided for HF terminal.
d) The electromagnetic unit comprising compensating reactor,
intermediate transformer and protective and damping devices should
have separate terminal box with all the secondary terminals brought out.
e) The damping device, which should be permanently connected to one of
the secondary windings, should be capable of suppressing the
ferroresonance oscillations.
f) The accuracy of 0.2 on secondary III for all CVTs/IVTs should be
maintained through out the entire burden range upto 50 VA on all the
windings without any adjustments during operation.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 8 of 34
 g) The Voltage Transformers shall be suitable for mounting on lattice
structure (for 800kV) or Pipe structure (for 420kV and below) to be
provided by the Contractor in accordance with stipulations of
Section-Project/Section-Structures.
h) It should be ensured that access to secondary terminals is without any
danger of access to high voltage circuit.
i) A protective surge arrester shall be provided, if required, to prevent
breakdown of insulation by incoming surges and to limit abnormal rise
of terminal voltage of shunt capacitor/primary winding, tuning
reactor/RF choke etc. due to short circuit in transformer secondaries.
Alternate arrangement shall also be acceptable.
j) The wiring diagram for the interconnection of the three single phase
CVTs/IVTs shall be provided inside the marshalling box in such a
manner that it does not deteriorate with time. Wiring diagram no.:
0000-000-T-E-L-029 enclosed herewith at Annexure-IV of this
specification shall be followed.

5.0 TERMINAL CONNECTORS:

The terminal connectors shall meet the requirements as given in Section-GTR
and technical parameters for the respective equipment as per Annexure-
I and Annexure-II of this specification.

6.0 TESTS:
6.1 In accordance with the requirements in Section-GTR, Current Transformer
and Voltage Transformer should have been type tested and shall be subjected
to routine tests in accordance with relevant IEC.
6.2 The test reports of type tests, as applicable, as per IEC-61869-2 for CT,
IEC-61869-5/IEC-60358 for CVT, and IEC-61869-3 for IVT and
following additional tests shall be submitted for the Employer’s review. The
type tests for which the procedure is under consideration as per
abovesaid IEC is not required to be considered.
a) Current Transformers (CT):
i) Corona test as per Annexure-A of Section-GTR for 420kV and
above voltage rating.
ii) RIV test as per IEC-61869 or as per Annexure-A of Section-
GTR for 145kV and above voltage rating. However, RIV level
shall be as specified at Annexure-II of this specification.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 9 of 34
 iii) Seismic withstand test as per Annexure-B of Section-GTR or IEC-
62271-2 (with Seismic acceleration requirement as per
Annexure-I of this specification/Section-Project) for 145kV and
above voltage rating.
iv) Thermal stability test, i.e. application of rated voltage and rated
extended thermal current simultaneously by synthetic test circuit
for 145kV and above voltage rating (not applicable for SF6 filled
CT).

v) Thermal co-efficient test i.e. measurement of tan-delta as a function

of temperature (at ambient and between 80oC & 90oC) and voltage
(at 0.3, 0.7, 1.0 and 1.1 Um/√3) for 145kV and above voltage
rating (not applicable for SF6 filled CT).
vi) Multiple chopped impulse test (not applicable for SF6 filled CT)
with the application of 600 chopped impulses for 145kV and
above voltage rating.
. vii) Transmitted over voltage test for 145kV and above voltage
rating
viii) Mechanical test (with minimum Cantilever load as per clause
no. 2.1.c) for 145kV and above voltage rating
ix) Internal Arc fault test for 145kV and above voltage rating (not
applicable for CT with Polymer Insulator)

x) Enclosure tightness test at low & high temperature for SF6

filled CT of 145kV and above voltage rating
xi) Gas dew point test for SF6 filled CT
xii) Corrosion test for 145kV and above voltage rating

b) Capacitive Voltage Transformers (CVT):

i) High frequency capacitance and equivalent series resistance
measurement (as per IEC-60358)
ii) Seismic withstand test (as per Annexure-B of Section-GTR) or
IEC-62271-2 (with Seismic acceleration requirement as per
Annexure-II of this specification/Section-Project) for 145kV
and above voltage class.
iii) Stray capacitance and stray conductance measurement of the low
voltage terminal (as per IEC-60358)

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 10 of 34
 iv) Corona test as per Annexure-A of Section-GTR for 420kV and
above voltage rating.

v) RIV test as per IEC-61869 or as per Annexure-A of Section-

GTR for 145kV and above voltage rating. However, RIV level
shall be as specified at Annexure-II of this specification.
vi) Transmitted over voltage test for 145kV and above voltage
rating
vii) Mechanical test (with minimum Cantilever load as per clause
no. 2.1.c) for 72.5kV and above voltage rating
viii) Determination of Temperature coefficient for 145kV and
above voltage rating
ix) Tightness design test of capacitor units for 145kV and above
voltage rating
x) Corrosion test for 145kV and above voltage rating

c) Inductive Voltage Transformers (IVT):

i) Seismic withstand test (as per Annexure-B of Section-GTR) or
IEC-62271-2 (with Seismic acceleration requirement as per
Annexure-II of this specification/Section-Project) for 145kV
and above voltage rating.
ii) Corona test as per Annexure-A of Section-GTR for 420kV and
above voltage rating.

ii) RIV test as per IEC-61869 or as per Annexure-A of Section-

GTR for 145kV and above voltage rating. However, RIV level
shall be as specified at Annexure-II of this specification.
iii) Multiple chopped impulse test with application of 600 chopped
impulses for 145kV and above voltage rating (not applicable for
SF6 filled CT).

iv) Transmitted over voltage test for 145kV and above voltage
rating
v) Mechanical test (with minimum Cantilever load as per clause
no. 2.1.c) for 72.5kV and above voltage rating
vi) Enclosure tightness test at low & high temperature for SF6
filled CT of 145kV and above voltage rating
vii) Gas dew point test for SF6 filled CT

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 11 of 34
 viii) Corrosion test for 145kV and above voltage rating
ix) Measurement of Capacitance and Dielectric dissipation factor
for 145kV and above voltage rating
6.3 The current and voltage transformer shall be subjected to the following
routine tests in addition to routine tests as per relevant IEC.

a) CURRENT TRANSFORMERS:
ROUTINE TESTS:
For Oil filled CT:
i) Measurement of Capacitance.
ii) Oil leakage test.
iii) Measurement of tan delta at 0.3, 0.7, 1.0 and 1.1 Um/√3.
For SF6 filled CT:
i) Dew point measurement
ii) SF6 alarm/ lockout check.
iii) SF6 gas leakage test: Gas leakage rate shall be maintained
within 0.2% per annum.

b) VOLTAGE TRANSFORMERS:
Routine tests on CVT/IVT shall be done in line with IEC-61869-3/61869-5.
7.0 MANDATORY SPARES:
Bidder shall include in his proposal mandatory spares as mentioned in the
Bidding Documents.

8.0 MAJOR TECHNICAL PARAMETERS:

Major technical parameters for 800kV/420kV/245kV/145kV/72.5kV
Instrument Transformers are enclosed at Annexure-I and Annexure-II
to this specification.

9.0 PRE-COMMISSIONING TESTS

9.1 An indicative list of tests is given below. Contractor shall perform any
additional test based on specialties of the items as per the field
Q.P./Instructions of the equipment Supplier or Employer without any extra
cost to the Employer. The Contractor shall arrange all instruments

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 12 of 34
 required for conducting these tests alongwith calibration certificates at
his own cost.
9.2 Current Transformers
(a) Insulation Resistance Test for primary and secondary
(b) Polarity test
(c) Ratio identification test - checking of all ratios on all cores by primary
injection of current
(d) Dielectric test of oil (wherever applicable)
(e) Magnetizing characteristics test
(f) Tan delta and capacitance measurement
(g) Secondary winding resistance measurement
(h) Contact resistance measurement (wherever possible/accessible)
(i) Test for SF6 (for SF6 filled CTs) – Dew point measurement, SF6 alarm/
lockout check
(j) DGA test of oil

Dissolved Gas Analysis (DGA) shall be carried out twice within the first
year of service, first within the first month of commissioning/charging
and second between six months to one year from the date of
commissioning/charging.
CTs/IVTs must have adequate provision for taking oil samples from the
bottom of the CT/IVT without exposure to atmosphere. Manufacturer shall
recommend the frequency at which oil samples should be taken and norms
for various gases in oil after being in operation for different durations.
Bidder/Manufacturer should also indicate the total quantity of oil which can
be withdrawn from CT for gas analysis before refilling or further treatment of
CT becomes necessary.

Bidder shall supply 2 nos. oil sampling device for every 20 nos. oil filled
CT supplied with a minimum of 2 nos. oil sampling device for each
substation.
9.3 Inductive Voltage Transformers/Capacitive Voltage Transformers
(a) Insulation Resistance test for primary (if applicable) and secondary
winding
(b) Polarity test
(c) Ratio test
(d) Dielectric test of oil (wherever applicable)

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 13 of 34
 (e) Tan delta and capacitance measurement of individual capacitor stacks
(f) Secondary winding resistance measurement

For pre-commissioning procedures and formats for Current Transformers,

Doc.No.: CF/CT/04/R-4 dtd-01.04.2013 and for Voltage Transformers,
CF/CVT/05/R-4 dtd-01.04.2011 under POWERGRID document no. D-2-01-
03-01-04 will be the reference document. This document will be available
at respective sites and shall be referred by the contractor.

10.0 Defect Liability

The actions required to be taken by contractor in case of defects observed in

CT/CVT of ratings 145kV & above during the warranty period (defect liability
period) shall be as per enclosed Annexure-V of this specification. Further, the
replaced/repaired/refurbished equipment (or part of equipment) shall have
Two (2) years warranty without prejudice to contractual warranty period
(defect liability period).

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 14 of 34
 TABLE - IA
REQUIREMENTS OF 800 KV CAPACITIVE VOLTAGE TRANSFORMER
————————————————————————————————————
S.No. PARTICULAR
————————————————————————————————————
1. Rated primary voltage (kV rms) 800
2. Type Single phase Capacitor VT
3. No. of secondaries 3
4. Rated voltage factor 1.2 continuous
1.5 - 30 seconds
5. Phase angle error + 10 minutes (For metering
core)
6. Capacitance (pf) 4400/8800* (+10% /- 5%)

7. Core details Core-1 Core-2 Core-3

a) Voltage Ratio 765/0.11 765/0.11 765/0.11
√3 √3 √3 √3 √3 √3
b) Application Protec- Protec- Meter-
tion tion ing
c) Accuracy 0.5&3P 0.5&3P 0.2
d) Min. Output burden (VA) 50 50 50
————————————————————————————————————
* Capacitance value shall be as specified in BPS.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 15 of 34
 TABLE - IB
REQUIREMENTS OF 420 KV VOLTAGE TRANSFORMER
————————————————————————————————————
S.No. PARTICULAR
————————————————————————————————————
1. Rated primary voltage (kV rms) 420

2. Type Single phase Electromagnetic

or Capacitor VT

3. No. of secondaries 3
4. Rated voltage factor 1.2 continuous
1.5 - 30 seconds
5. Phase angle error + 10 minutes (For metering
core)
6. Capacitance (pf) (for CVT) 4400/8800* (+10% / - 5%)
7. Core details Core-1 Core-2 Core-3
a) Voltage Ratio 400/0.11 400/0.11 400/0.11
√3 √3 √3 √3 √3 √3
b) Application Protec- Protec- Meter-
tion tion ing
c) Accuracy 0.5&3P 0.5&3P 0.2
d) Min. Output burden (VA) 50 50 50
————————————————————————————————————
* Capacitance value shall be as specified in BPS.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 16 of 34
 TABLE - IC
REQUIREMENTS OF 245 KV VOLTAGE TRANSFORMER
————————————————————————————————————
S.No. PARTICULAR
————————————————————————————————————
1. Rated primary voltage (kV rms) 245

2. Type Single phase Electromagnetic

or Capacitor VT

3. No. of secondaries 3 cores

4. Rated voltage factor 1.2 continuous
1.5 - 30 seconds
5. Phase angle error + 10 minutes (For metering
core)
6. Capacitance (pf) (for CVT) 4400/8800* (+10% / - 5%)
7. Core details Core-1 Core-2 Core-3
a) Voltage Ratio 220/0.11 220/0.11 220/0.11
√3 √3 √3 √3 √3 √3
b) Application Protec- Protec- Meter-
tion tion ing
c) Accuracy 3P 3P 0.2
d) Min. Output burden (VA) 50 50 50
————————————————————————————————————
* Capacitance value shall be as specified in BPS.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 17 of 34
 TABLE - ID
REQUIREMENTS OF 145 KV VOLTAGE TRANSFORMER
————————————————————————————————————
S.No. PARTICULAR
————————————————————————————————————
1. Rated primary voltage (kV rms) 145

2. Type Single phase Electromagnetic

or Capacitor VT

3. No. of secondaries 3 cores

4. Rated voltage factor 1.2 continuous
1.5 - 30 seconds
5. Phase angle error + 10 minutes (For metering
core)
6. Capacitance (pf) (for CVT) 8800 (+ 10% / -5%)
7. Core details Core-1 Core-2 Core-3
a) Voltage Ratio 132/0.11 132/0.11 132/0.11
√3 √3 √3 √3 √3 √3
b) Application Protec- Protec- Meter-
tion tion ing
c) Accuracy 3P 3P 0.2
d) Min. Output burden (VA) 50 50 50
————————————————————————————————————

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 18 of 34
 TABLE - IE
REQUIREMENTS OF 72.5 KV VOLTAGE TRANSFORMER
————————————————————————————————————
S.No. PARTICULAR
————————————————————————————————————

1. Rated primary voltage (kV rms) 72.5

2. Type Single phase Electro-magnetic

or Capacitive VT

3. No. of secondaries 2 cores

4. Rated Voltage Factor 1.2 continuous

1.5 – 30 seconds

5. Phase angle error + 20 minutes (For metering

core)

6. Core details Core-1 Core-2

a) Voltage ratio For 66 kV feeder application

66/√3 /0.11/√3 66/√3 /0.11/√3

For tertiary loading (of ICT)

application
33/√3 /0.11/√3 33/√3 /0.11/√3

b) Application Protection Metering

c) Accuracy 3P 0.5

d) Output Burden (VA) (minimum) 10 10

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 19 of 34
 TABLE-IIA

REQUIREMENTS FOR 800 KV CURRENT TRANSFORMER

No. of Core Application Current Output Accuracy Min. Knee Max. CT Max.
Cores. No. Ratio Burden Class Pt. Sec. wdg. Excit.
(VA) Voltage Resistance Current
(Vk) (in  ) at Vk (in
mA)

6 1 BUS DIFF. 3000/ - PX 3000/ 15/10/2.5 20 on

CHECK 2000/ 2000/ 3000/1
500/1 500 TAP;
30 on
2000/1;
120 on
500/1 tap
2. BUS DIFF. 3000/ - PX 3000/ 15/10/2.5 20 on
MAIN 2000/ 2000/ 3000/1
500/1 500 TAP;
30 on
2000/1;
120 on
500/1 tap
3. METERING 3000/ 20 0.2S - -
2000/ 20 0.2S - -
500/1 20 0.2S - -
4. METERING 3000/ 20 0.2S - -
2000/ 20 0.2S - -
500/1 20 0.2S - -

5. TRANSF 3000/ - PX 3000/ 15/10/2.5 20 on

DIFF./ LINE 2000/ 2000/ 3000/1
PROTN. 500/1 500 TAP;
30 on
2000/1;
120 on
500/1 tap
6 LINE 3000- - PX 3000/ 15/10/2.5 20 on
PROTN/LBB 2000- 2000 3000/1
PROTN. 500/1 500 Tap,30
on
2000/1
Tap,120
on 500/1
Tap

Note: 1. Protection cores shall be of accuracy class PX as per IEC 61869.

2. Metering Core shall be of accuracy class 0.2S as per IEC: 61869

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 20 of 34
 TABLE-IIB

REQUIREMENTS FOR 420 KV CURRENT TRANSFORMER

No. Core Application Ratio Output Accuracy Min. Max. CT Max. Excit.
of No. Burden Class Knee Pt. Sec. wdg. Current at
cores Voltage Resistance Vk (in mA)
(Vk) (in )

6 1 BUS DIFF. 3000/ - PX 3000/ 15/10/2.5 20 on

CHECK 2000/ 2000/ 3000/1
500/1 500 TAP;
30 on
2000/1;
120 on
500/1 tap
2. BUS DIFF. 3000/ - PX 3000/ 15/10/2.5 20 on
MAIN 2000/ 2000/ 3000/1
500/1 500 TAP;
30 on
2000/1;
120 on
500/1 tap
3. METERING 3000/ 20 0.2S - -
2000/ 20 0.2S - -
500/1 20 0.2S - -

4. METERING 3000/ 20 0.2S - -

2000/ 20 0.2S - -
500/1 20 0.2S - -

5. TRANS. 3000/ - PX 3000/ 15/10/2.5 20 on

BACK 2000/ 2000/ 3000/1
UP/LINE 500/1 500 TAP;
PROTN. 30 on
2000/1;
120 on
500/1 tap
6. TRANS. DIFF. 3000/ - PX 3000/ 15/10/2.5 20 on
/LINE PROTN. 2000/ 2000/ 3000/1
500/1 500 TAP;
30 on
2000/1;
120 on
500/1 tap

Note: 1. Protection cores shall be of accuracy class PX as per IEC 61869.

2. Metering Core shall be of accuracy class 0.2S as per IEC: 61869

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 21 of 34
 TABLE - IIC
REQUIREMENTS FOR 245 KV CURRENT TRANSFORMER
No.of Core Appli- Current Output Accuracy Min. knee Max. CT Max. Excit-
Cores No. cation ratio burden class pt.volt- sec.wdg. ation cur-
(VA) age (Vk) resist- rent at Vk
ance(ohms) (in mA)
5 1 BUS DIFF 1600- - PX 1600/ 8/4 25 on
CHECK 800/1 800 1600/1
Tap; 50 on
800/1 Tap

2 BUS DIFF 1600- - PX 1600/ 8/4 25 on

MAIN 800/1 800 1600/1
Tap;
50 on
800/1
Tap

3 METERING 1600- 20 0.2S - - -

800/1

4 TRANS. 1600- - PX 1600/ 8/4 25 on

BACK 800/1 800 1600/1
UP/LINE Tap;
PROTN. 50 on
800/1
Tap

5 TRANS. 1600- - PX 1600/ 8/4 25 on

DIFF/LINE 800/1 800 1600/1
PROTN Tap;
50 on
800/1
Tap

Note: 1. Protection cores shall be of accuracy class PX as per IEC 61869.

2. Metering Core shall be of accuracy class 0.2S as per IEC: 61869

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 22 of 34
 TABLE - IID

REQUIREMENTS FOR 145 KV CURRENT TRANSFORMER

No.of Core Appli- Current Output Accuracy Min. knee Max. CT Max. Excit-
Cores No. cation ratio burden class pt.volt- sec.wdg. ation cur-
(VA) age Vk resist- rent at Vk
ance(ohms) (in mA)
5 1 BUS DIFF 800- - PX 800/ 8/4 25 on
CHECK 400/1 400 800/1
Tap;
50 on
400/1
Tap

2 BUS DIFF 800- - PX 800/ 8/4 25 on

MAIN 400/1 400 800/1
Tap;
50 on
400/1
Tap

3 METERING 800- 20 0.2S - - -

400/1

4 TRANS. 800- - PX 800/ 8/4 25 on

BACK 400/1 400 800/1
UP/LINE Tap;
PROTN. 50 on
400/1
Tap

5 TRANS. 800- - PX 800/ 8/4 25 on

DIFF/LINE 400/1 400 800/1
PROTN Tap;
50 on
400/1
Tap

Note: 1. Protection cores shall be of accuracy class PX as per IEC 61869.

2. Metering Core shall be of accuracy class 0.2S as per IEC: 61869

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 23 of 34
 TABLE – IIE

REQUIREMENTS FOR 145 kV CURRENT TRANSFORMER

No.of Core Appli- Current Output Accuracy Min. knee Max. CT Max. Excit-
Cores No. cation ratio burden class pt.volt- sec.wdg. ation cur-
(VA) age Vk resist- rent at Vk
ance(ohms) (in mA)
5 1 BUS DIFF 600- - PX 600/ 6/3 30 on
CHECK 300/1 300 600/1
Tap;
60 on
300/1
Tap

2 BUS DIFF 600- - PX 600/ 6/3 30 on

MAIN 300/1 300 600/1
Tap;
on
300/1
Tap

3 METERING 300- 20 0.2S - - -

150/1

4 TRANS. 600- - PX 600/ 6/3 30 on

BACK 300/1 300 600/1
UP/LINE Tap;
PROTN. 60 on
300/1
Tap

5 TRANS. 600- - PX 600/ 6/3 30 on

DIFF/LINE 300/1 300 600/1
PROTN Tap;
60 on
300/1
Tap

Note: 1. Protection cores shall be of accuracy class PX as per IEC 61869.

2. Metering Core shall be of accuracy class 0.2S as per IEC: 61869

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 24 of 34
 TABLE – IIF

REQUIREMENTS FOR 72.5 kV CURRENT TRANSFORMER

(FOR TERTIARY LOADING OF ICT)

No. Core Application Current Output Accuracy class

of No. Ratio burden & ALF
Cores (VA)
2 1 O/C & E/F 50/1 10 5P10

2 Metering 50/1 10 0.5

________________________________________________________________________

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 25 of 34
 Annexure-I
MAJOR TECHNICAL PARAMETERS FOR CT

S. No. Description 765kV 400kV 220kV 132 kV 66 kV

system system system system System (for
Tertiary
loading)
1 Rated voltage, Um 800 420 245 145 72.5
(kVrms)
2 Rated frequency (Hz) 50 50 50 50 50
3 No. of Poles 1 1 1 1 1
4 Design ambient 50 50 50 50 50
temperature (°C)
5 Rated Primary 3000 3000 1600 800/600 50
Current (A)
6 Rated extended 120% 120% 120%/150% 120%/150 120%
primary current %
7 Rated short time 40kA/50kA (as 40kA/50kA/63kA 40kA/50kA (as
thermal withstand 31.5kA for 25kA for
applicable) for 1 (as applicable) for applicable) for 1
current 1sec 3sec
sec 1 sec sec
8 Rated dynamic 100kAp/125kAp/
100kAp/125kAp 100kAp/125kAp
current 157.5kAp (as 80kAp 63kAp
(as applicable) (as applicable)
applicable)
9 Temperature rise over
design ambient As per IEC
temperature
10 Rated Insulation levels
a) Full wave impulse withstand voltage (1.2/50 microsecond)
i) between line ±2100 ±1425 ±1050 ±650 ±325
terminals and
ground(kVpeak)
b) Switching impulse withstand voltage (250/2500 microsecond) (dry and wet)
i) between line ± 1550 ± 1050 -NA- -NA- -NA-
terminals and ground
(kVpeak)
c) One minute power frequency dry withstand voltage (dry and wet)
i) between line 975 630 460 275 140
terminals and ground (dry only) (dry only)
(kVrms)
d) One minute power
frequency withstand
5kV
voltage between
secondary terminals
& earth (kVrms)

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 26 of 34
S. No. Description 765kV 400kV 220kV 132 kV 66 kV
system system system system System (for
Tertiary
loading)
11 Max. radio 2500 at 1000 at 1000 at 500 at -NA-
interference voltage 508 kV rms 266kV rms 156kV rms 92kV rms
for frequency
between0.5 MHz and
2 MHz at (microvolts)
12 Minimum Corona 508 320 -NA- -NA- -NA-
extinction voltage
(kVrms)
13 Seismic acceleration 0.3g 0.3g 0.3g 0.3g -NA-
(Horizontal)
14 Partial Discharge As per IEC As per IEC As per IEC As per IEC As per IEC
15 Number of terminals All terminals of control circuits are to be wired up to marshaling box
plus 20% spare terminals evenly distributed on all TBs.
16 Minimum Creepage
20000 10500 6125 3625 1813
distance (mm) *
17 System neutral Effectively Earthed
earthing

*The values indicated are for specific creepage of 25mm/kV. In case of specific creepage
of 31mm/kV is specified, the Minimum Creepage distance values shall be considered
proportionately.

For other parameters, refer respective Table for the applicable voltage class of CTs.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 27 of 34
 Annexure-II
MAJOR TECHNICAL PARAMETERS FOR CVT/IVT

S. No. Description 765kV 400kV 220kV 132 kV 66 kV

system system system system System (for
tertiary
loading)
1 Type (CVT/IVT) CVT CVT/IVT CVT/IVT CVT/IVT CVT/IVT
2 Rated voltage, Um 800 420 245 145 72.5
(kVrms)
3 Rated frequency (Hz) 50 50 50 50 50
4 No. of Poles 1 1 1 1 1

5 Design ambient 50 50 50 50 50
temperature (°C)
6 System fault level 40kA/50kA (as 40kA/50kA/63kA 40kA/50kA (as
(kA) 31.5kA for 25kA for
applicable) for 1 (as applicable) for applicable) for 1
1sec 3sec
sec 1 sec sec
6 Standard reference 96% to 102% for protection and
range of frequencies 99% to 101% for measurement
for which the
accuracies are valid
7 High frequency Within 80% to 150% of rated capacitance -
capacitance for entire
carrier frequency
range (for CVT only)
8 Equivalent series
resistance over entire
Less than 40 Ohms -
carrier frequency
range (for CVT)
9 Stray capacitance and
stray conductance of
HF terminal over
As per IEC-60358 -
entire carrier
frequency range (for
CVT)
10 Temperature rise over
design ambient As per IEC
temperature
11 Rated Insulation levels
a) Full wave impulse withstand voltage (1.2/50 microsecond)
i) between line ±2100 ±1425 ±1050 ±650 ±325
terminals and ground
(kVpeak)
b) Switching impulse withstand voltage (250/2500 microsecond) (dry and wet)
Technical Specification, Section: Switchgear-INST
C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 28 of 34
S. No. Description 765kV 400kV 220kV 132 kV 66 kV
system system system system System (for
tertiary
loading)
i) between line ± 1550 ± 1050 -NA- -NA- -NA-
terminals and ground
(kVpeak)
c) One minute power frequency dry withstand voltage (dry and wet)
i) between line 975 630 460 275 140
terminals and ground (dry only) (dry only)
(kVrms)
d) One minute power frequency withstand voltage between secondary terminals & earth
i) between LV (HF) 10kVrms for exposed terminals and 4kVrms for terminals enclosed in a weather
terminal and earth proof box
terminal (kVrms)
ii) For secondary 3kVrms
winding

11 Max. radio 2500 at 1000 at 1000 at 500 at -NA-

interference voltage 508 kV rms 266kV rms 156kV rms 92kV rms
for frequency
between0.5 MHz and
2 MHz at (microvolts)
12 Minimum Corona 508 320 -NA- -NA- -NA-
extinction voltage
(kVrms)
13 Seismic acceleration 0.3g 0.3g 0.3g 0.3g -NA-
(Horizontal)
14 Partial Discharge As per IEC As per IEC As per IEC As per IEC As per IEC
15 Number of terminals All terminals of control circuits are to be wired up to marshaling box
plus 20% spare terminals evenly distributed on all TBs.
16 Rated Total Thermal 300 VA (100VA/winding) 20VA
Burden (VA)
17 System neutral
Effectively Earthed
earthing
Minimum Creepage
20000 10500 6125 3625 1813
distance (mm) *

*The values indicated are for specific creepage of 25mm/kV. In case of specific creepage
of 31mm/kV is specified, the Minimum Creepage distance values shall be considered
proportionately.

For other parameters, refer respective Table for the applicable voltage class of CVTs/IVTs.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 29 of 34
 Annexure-III: Wiring Diagram of CT

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 30 of 34
 Annexure-III: Wiring Diagram of CT

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 31 of 34
 Annexure-IV: Wiring Diagram of VT

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 32 of 34
 Annexure-IV: Wiring Diagram of VT

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 33 of 34
 Annexure-V: Actions required in case of defects observed during warrantee
period

Equipment Nature of problem Corrective measures to be taken by

contractor
CT DGA Violation CT to be refurbished or replaced
(Oil filled) H2 > 300 ppm
C2H2> 2 ppm

CT a) SF6 gas leakage a)Repair/ replacement

(SF6 filled) b) High Dew point of SF6 gas ( > -36 deg C at atm b)Re-processing of gas and
press) replacement of Gas in case of no
improvement

CT Violation of Tan delta Replacement of CT

(Oil filled) Tan Delta:
>0.5%( during pre-commisioning )
>0.7% ( in operation)
or change w.r.t. to previous year value > 0.1%

CT & CVT - Oil leakage Replacement or repair as per repair

- Low Oil level procedure approved by QA.
-Sec winding problem leading to open/ short
circuit, saturation etc

CVT Secondary voltage drift: Upto ± 0.5 volts Healthy

a) ± 0.5 or beyond a) CVT to be replaced

*Replaced/Repaired/Refurbished Equipment (or part of equipment) shall have 2 years warranty

without prejudice to contractual warranty period.

Technical Specification, Section: Switchgear-INST

C/ENGG/SPEC/SWGR/R11, JAN 2017 Page 34 of 34
 MODEL TECHNICAL SPECIFICATION

SECTION-SWITCHGEAR - ISOLATOR

(REV. NO. 11B)

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 1 of 18
Following are the major changes made in the Technical specification, Section-
Switchgear - ISOLATOR, Rev. 11B:

Clause No. Major Modification

1.2.1 Interpole cables deleted from scope of manufacturer
3.1(e) Current Density value deleted
5(m) Common Marshalling Box deleted
5(n) Plug-in type terminals for interconnecting cables deleted

Notes: The above is the list of major changes with respect to previous revision (Rev.
11/11A). However, the bidders are advised to read the entire section for other changes
and quote accordingly.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 2 of 18
 SWITCHGEAR – ISOLATOR

CONTENTS

Clause.No. Description Page

No.

1.0 General 4

2.0 Duty requirements 4

3.0 Constructional Features 5

4.0 Earthing Switches 8

5.0 Operating Mechanism 9

6.0 Operation 10

7.0 Terminal Connector stud/pad 11

8.0 Support Structure 12

9.0 Tests 12

10.0 Mandatory Spares 12

11.0 Technical Parameters 12

12.0 Pre-Commissioning Tests 13

Annexure-I

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 3 of 18
 SWITCHGEAR - ISOLATOR

1.0 GENERAL:

1.1 The Isolators and accessories shall conform in general to IEC: 62271-102/103
except to the extent explicitly modified in specification and shall be in
accordance with requirement of Section-GTR.

1.2 Complete isolator with all the necessary items for successful operation shall be
supplied including but not limited to the following:

1.2.1 Isolator with complete Support Insulators, operating rod insulator, base frame,
linkages, operating mechanism, control cabinet, interlock etc.

1.2.2 All necessary parts to provide a complete and operable isolator installation,
control parts and other devices whether specifically called for herein or not.

1.2.3 The isolator shall be designed for use in the geographic and meteorological
conditions as given in Section-GTR and Section-Project.

2.0 DUTY REQUIREMENTS:

a) Isolators and earth switches shall be capable of withstanding the dynamic

and thermal effects of the maximum possible short circuit current of the
systems in their closed position. They shall be constructed such that they
do not open under influence of short circuit current.

b) The earth switches, wherever provided, shall be constructionally

interlocked so that the earth switches can be operated only when the
isolator is open and vice versa. The constructional interlocks shall be built
in construction of isolator and shall be in addition to the electrical
interlocks. Suitable mechanical arrangement shall also be provided for
delinking electrical drive for manual operation.

c) In addition to the constructional interlock, isolator and earth switches shall

have provision to prevent their electrical and manual operation unless the
associated and other interlocking conditions are met. All these interlocks
shall be of failsafe type. Suitable individual interlocking coil arrangements
shall be provided. The interlocking coil shall be suitable for continuous
operation from station DC supply and within a variation range as
stipulated in Section-GTR.

d) The earthing switches shall be capable of discharging trapped charges of

the associated lines.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 4 of 18
 e) The isolator shall be capable of making/breaking normal currents when no
significant change in voltage occurs across the terminals of each pole of
isolator on account of make/break operation.

3.0 CONSTRUCTIONAL FEATURES:

Isolators shall be outdoor, off-load type. Earth switches shall be provided on
isolators wherever called for, with possibility of being mounted on any side of
the isolator. 800kV isolator design shall be double break or vertical break or
knee-type. 420kV & below rated isolators shall be double break type, unless
specified otherwise. Isolator design shall be such as to permit addition of earth
switches at a future date. The features and constructional details of isolators,
earth switches and accessories shall be in accordance with requirements stated
hereunder:

3.1 Contacts:

a) The contacts shall be self aligning and self cleaning type and shall be so
designed that binding cannot occur after remaining in closed position for
prolonged period in a heavily polluted atmosphere.

b) No undue wear or scuffing shall be evident during the mechanical

endurance tests. Contacts and spring shall be designed so that
readjustments in contact pressure shall not be necessary throughout the life
of the isolator or earthing switch. Each contact or pair of contacts shall be
independently sprung so that full pressure is maintained on all contacts at
all time.

c) Contact springs shall not carry any current and shall not loose their
characteristics due to heating effects.

d) The moving contact of double break isolator shall have preferably turn-and-
twist type or other suitable type of locking arrangement to ensure adequate
contact pressure.

e) Flexible braided copper, where used, shall have corrosion resistant coating
such as tinning or silvering.

3.2 Base :

Each single pole of the isolator shall be provided with a complete galvanised
steel base provided with holes and designed for mounting on a standard
supporting structure. Common base frame shall be provided for 400/220/132kV
isolators suitable for mounting on pipe structures.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 5 of 18
3.3 Blades :

a) All metal parts shall be of non-rusting and non-corroding material. All

current carrying parts shall be made from high conductivity electrolytic
copper/aluminium. Bolts, screws and pins shall be provided with lock
washers. Keys or equivalent locking facilities if provided on current
carrying parts shall be made of copper silicon alloy or stainless steel or
equivalent. The bolts or pins used in current carrying parts shall be made
of non-corroding material. Ferrous parts, other than stainless steel shall
not be used in close proximity of main current path. All ferrous castings, if
used elsewhere shall be made of malleable cast iron or cast-steel. No
grey iron shall be used in the manufacture of any part of the isolator.

b) The live parts shall be designed to eliminate sharp joints, edges and other
corona producing surfaces, where this is impracticable, adequate corona
rings shall be provided. Corona shields are not acceptable. Corona rings
shall be made up of aluminum/aluminum alloy.

c) Isolators and earthing switches including their operating parts shall be

such that they cannot be dislodged from their open or closed positions by
short circuit forces, gravity, wind pressure, vibrations, shocks, or
accidental touching of the connecting rods of the operating mechanism.

d) The isolator and earth switch shall be designed such that no lubrication of
any part is required except at very infrequent intervals. i.e. after every
1000 operations or after 5 years whichever is earlier.

3.4 Insulator :

a) The insulator shall conform to IS: 2544, IEC-60168 and IEC-60815. The
porcelain of the insulator shall conform to the requirements stipulated
under Section-GTR.

b) Pressure due to the contact shall not be transferred to the insulators after
the main blades are fully closed.

c) Insulator shall be type and routine tested as per IEC-60168. Besides

following additional routine/acceptance tests shall also be conducted:

(i) Bending load test in four directions at 50% of minimum bending load
guaranteed on all insulators, as a routine test.

(ii) Bending load test in four directions at 100% of minimum bending

load as a sample test on each lot.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 6 of 18
 (iii) Torsional test on sample insulators of a lot.

(iv) Ultrasonic test as a routine test.

d) Requirement of Insulators of Isolators shall be as follows:

i) For 800 kV Insulator:

Cantilever strength (min.) = 1000kg

Top PCD = 225 mm
No. of holes = 4 x M16
Bottom PCD = 356 mm
No. of holes = 8 x 18mm dia.

ii) For 420 kV Insulator:

Cantilever strength (min.) = 1000kg

Top PCD = 127 mm
No. of holes = 4 x M16
Bottom PCD = 325 mm
No. of holes = 8 x 18mm dia

iii) For 245 kV Insulator:

Cantilever strength (min.) = 1000kg

Top PCD = 127 mm
No. of holes = 4 x M16
Bottom PCD = 275 mm
No. of holes = 8 x 18mm dia

iv) For 145 kV Insulator:

Cantilever strength (min.) = 600kg

Top PCD = 127 mm
No. of holes = 4 x M16
Bottom PCD = 254 mm
No. of holes = 8 x 18mm dia

3.5 Name Plate :

The name plate shall conform to the requirements of IEC incorporating year of
manufacture.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 7 of 18
4.0 EARTHING SWITCHES :

a) Where earthing switches are specified these shall include the complete
operating mechanism and auxiliary contacts.

b) The earthing switches shall form an integral part of the isolator and shall
be mounted on the base frame of the isolator.

c) Earthing switches shall be only locally operated.

d) Each earth switch shall be provided with flexible copper/aluminum braids

for connection to earth terminal. These braids shall have the same short
time current carrying capacity as the earth blade. The transfer of fault
current through swivel connection will not be accepted.

e) The plane of movement and final position of the earth blades shall be
such that adequate electrical clearances are obtained from adjacent live
parts in the course of its movement between ON and OFF position.

f) The frame of each isolator and earthing switches shall be provided with
two reliable earth terminals for connection to the earth mat.

g) The earth switch should be able to carry the same fault current as the
main blades of the Isolators and shall withstand dynamic stresses.

h) 800kV, 420 kV & 245 kV earth switches shall also comply with the
requirements of IEC-62271-102, in respect of induced current switching
duty as defined for Class-B and short circuit making capability class E-0
for earthing switches.

i) Earth switch blade in open condition shall not project (from the centre line
of Insulator) by more than 4200mm for 400kV and 2810mm for 220kV
respectively.

5.0 OPERATING MECHANISM :

a) The bidder shall offer motor operated Isolators and earth switches.
Isolators of 36 kV and below and earth switches of 72.5 kV and below
rating shall be manual operated.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 8 of 18
 b) Control cabinet/operating mechanism box shall conform to the
requirement stipulated in Section-GTR and shall be made of cast
aluminium/aluminum sheet of adequate thickness (minimum 3 mm) or
stainless steel (grade-304) of minimum thickness 2mm.

c) A “Local/Remote” selector switch and a set of open/ close push buttons

shall be provided on the control cabinet of the isolator to permit its
operation through local or remote push buttons.

d) Provision shall be made in the control cabinet to disconnect power supply

to prevent local/remote power operation.

e) Motor shall be an AC motor and conform to the requirements of Section-

GTR.

f) Suitable reduction gearing shall be provided between the motor and the
drive shaft of the isolator. The mechanism shall stop immediately when
motor supply is switched off. If necessary a quick electro-mechanical
brake shall be fitted on the higher speed shaft to effect rapid braking.

g) Manual operation facility (with handle) should be provided with necessary

interlock to disconnect motor.

h) Gear should be of forged material suitably chosen to avoid

bending/jamming on operation after a prolonged period of non-operation.
Also all gear and connected material should be so chosen/surface treated
to avoid rusting.

i) Blocked rotor test of motor shall be conducted as a routine test. During

the blocked rotor test, overload protection relay should operate to prevent
failure of motor.

j) Only stranded conductor shall be used for wiring. Minimum size of the
conductor for control circuit wiring shall be 1.5 sq.mm. (Copper).

k) The operating mechanism shall be located such that it can be directly

mounted on any one of the support structure.

l) Snap type limit/auxiliary switches shall be used with Factory set values.
No adjustment shall be required at site during commissioning.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 9 of 18
6.0 OPERATION :

a) The main Isolator and earth switches shall be individual pole operated for
800/420 kV and gang operated in case of 245 kV & 145 kV. However,
245 kV Tandem Isolators shall be individual-pole operated. The operating
mechanism of all the three poles shall be well synchronized and
interlocked.

b) The design shall be such as to provide maximum reliability under all

service conditions. All operating linkages carrying mechanical loads shall
be designed for negligible deflection and strain less than 1%. The length
of inter insulator and interpole operating rods shall be capable of
adjustments, by means of screw thread which can be locked with a lock-
nut after an adjustment has been made. The isolator and earth switches
shall be provided with “over dead center” device in the operating
mechanism at open and close position to prevent accidental opening by
wind, vibration, short circuit forces or movement of the support structures.

c) Each isolator/pole of isolator and earth switch shall be provided with a

manual operating handle enabling one man to open or close the isolator
with ease while standing at ground level. Non-detachable type manual
operating handle shall have provision for padlocking. For detachable type
manual operating handles, suitable provision shall be made inside the
operating mechanism box for parking the detached handles. The provision
of manual operation shall be located at a convenient operating height from
the base of isolator support structure.

d) The isolator contacts shall be positively driven by the operating

mechanism continuous control throughout the entire cycle of operation.
The operating pipes and rods shall be sufficiently rigid to maintain positive
control under the most adverse conditions and when operated in tension
or compression for isolator closing / opening operation. They shall also be
capable of withstanding all torsional and bending stresses due to
operation of the isolator. Wherever supported, the operating rods shall be
provided with bearings on each support and at the either ends. The
operating rods/ pipes shall be provided with suitable universal couplings to
account for any angular misalignment.

e) All rotating parts shall be provided with grease packed roller or ball
bearings in sealed housings designed to prevent the ingress of moisture,
dirt or other foreign matter. Bearings pressure shall be kept low to ensure
long life and ease of operation. Locking pins wherever used shall be rust-
proof.

f) Signaling of closed position shall not take place unless it is certain that the
movable contacts, have reached a position in which rated normal current,

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 10 of 18
 peak withstand current and short time withstand current can be carried
safely. Signaling of open position shall not take place unless movable
contacts have reached a position such that clearance between contacts is
atleast 80% of the isolating distance.

g) The position of movable contact system (main blades) of each of the

Isolators and earthing switches shall be indicated by a mechanical indi-
cator at the lower end of the vertical rod of shaft for the Isolators and
earthing switch. The indicator shall be of metal and shall be visible from
operating level.

h) The contractor shall furnish the following details alongwith quality norms,
during detailed engineering stage:

(i) Current transfer arrangement from main blades of isolator alongwith

milli volt drop immediately across transfer point.

(ii) Details to demonstrate smooth transfer of rotary motion from motor

shaft to the insulator alongwith stoppers to prevent over travel.

7.0 TERMINAL CONNECTOR STUD/PAD:

The isolator terminal pads/studs shall be made of high quality copper or

aluminum and shall be conforming to Australian standard AS-2935 for rated
current. The terminal pad shall have protective covers which shall be removed
before interconnections. Only terminal pads shall be used for current ratings
above 1250A. Terminal pads shall be mounted below the current transfer
contacts so that the cantilever pull from the terminal connector is not transferred
through the current transfer point to the support insulator. The terminal pad shall
be suitable for horizontal plane connection with terminal connector. The terminal
pads for all isolators with 3150A & above rating shall have six holes for terminal
pad.

8.0 SUPPORT STRUCTURE:

800 kV/420 kV/245 kV/145 kV Isolators along with Earth switches shall be
suitable for mounting on standard support structures.

9.0 TESTS:

9.1 In continuation to the requirements stipulated under Section-GTR the isolator

alongwith its earthing switch and operating mechanism should have been type
tested as per IEC/IS and shall be subjected to routine tests in accordance with
IEC-62271-102. Minimum 1000 Nos. mechanical operations in line with
mechanical endurance test, M0 duty, shall be carried out on 1 (one) isolator out

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 11 of 18
 of every lot of Isolators, assembled completely with all accessories including
insulators, as acceptance test for the lot. The travel characteristics measured at
a suitable location in the base of insulator along with motor current/power
drawn, during the entire travel duration are to be recorded at the start and
completion and shall not vary by more than (+/-) 10% after completion of 1000
cycles of operation. After completion of test, mechanical interlock operation to
be checked.

9.2 The test reports of the type tests as per IEC 62271-102 and the following
additional type tests (additional type tests are required for isolators rated above
72.5 kV only) shall also be submitted for the Employer’s review.

(i) Radio interference voltage test as per Annexure-A of Section-GTR.

(ii) Corona Extinction Voltage test as per Annexure-A of Section-GTR

(iii) Seismic withstand test on isolator mounted on Support structure as per

Annexure-B of Section-GTR. The test shall be performed in the following
position :

Isolator open E/S Closed

Isolator open E/S Open
Isolator Closed E/S Open

10.0 MANDATORY SPARES:

Bidder shall include in his proposal mandatory spares as mentioned in the

Bidding Documents.

11.0 TECHNICAL PARAMETERS: As per table given at Annexure-I:

12.0 PRE-COMMISSIONING TESTS

12.1 Contractor shall perform any additional test based on specialties of the items as
per the field Q.P./Instructions of the equipment manufacturer or Employer
without any extra cost to the Employer. The Contractor shall arrange all
instruments required for conducting these tests alongwith calibration certificates
at his own cost.

An indicative list of tests on isolator and earthswitch is given below. For pre-
commissioning procedures and formats for Isolators and Grounding switch,
Doc.No.: CF/ISO/07/R-4, dtd-01.04.2013 under POWERGRID Document no. D-
2-01-03-01-04 will be the reference document. This document will be available
at respective sites and shall be referred by the contractor.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 12 of 18
 (a) Insulation resistance of each pole

(b) Manual and electrical operation and interlocks

(c) Insulation resistance of control circuits and motors

(d) Ground connections

(e) Contact resistance

(f) Proper alignment so as to minimize vibration during operation

(g) Measurement of operating Torque for isolator and Earth switch

(h) Resistance of operating and interlocks coils

(i) Functional check of the control schematic and electrical & mechanical
interlocks

(j) 50 operations test on isolator and earth switch

12. 2 The Contractor shall ensure that erection, testing and commissioning of
Isolators above 72.5 kV class shall be carried out under the supervision of the
Isolator manufacturer's representative and the cost of the same shall be
included in the erection price of the respective equipment.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 13 of 18
 Annexure-I

1. Technical Parameters for 765kV, 400kV, 220kV and 132kV Isolators

Sl. Description Unit 800kV ISO 420kV ISO 245kV ISO 145kV ISO
No.
1 Rated voltage kVrms 800 420 245 145
2 Rated frequency Hz 50 50 50 50
3 No. of poles Nos. 3 3 3 3
4 Design ambient °C 50 50 50 50
temperature
5 Type Outdoor Outdoor Outdoor Outdoor
6 Rated current at A 3150 3150 1600A / 1250
50oC ambient 2500 A (as
temperature applicable)
7 Rated short time kA 40 / 50 for 1 40 /50 /63 40 / 50 for 1 31.5 for 1
withstand current of sec (as for 1 sec (as sec (as sec
isolator and earth applicable) applicable) applicable)
switch
8 Rated dynamic short kAp 102kAp 100 kAp / 100 kAp / 80kAp
time withstand 125 kAp / 125 kAp (as
current of isolator 157.5 kAp applicable)
and earth switch (as
applicable)
9 Temperature rise As per Table-3 of IEC-62271-1
over design ambient
temperature
10 Rated mechanical N As per table III of IEC-62271-102 or as per value
terminal load calculated in Section-GTR whichever is higher

11 Mechanical Isolator-M2
Endurance Class E/S-M0
12 Operating A.C. Motor operated
mechanism of
isolator/erathswitch
13 No. of auxiliary Besides requirement of this spec., 5 NO + 5 NC contacts wired on
contacts on each each isolator to terminal block exclusively for Employer’s use in
isolator future.
14 No. of auxiliary Besides requirement of this spec., 3 NO + 3 NC contacts wired on
contacts on each each isolator to terminal block exclusively for Employer’s use in
earthing switch future.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 14 of 18
Sl. Description Unit 800kV ISO 420kV ISO 245kV ISO 145kV ISO
No.
14 Max. Operating time secs 20 sec. for 20 secs 12 secs 12 secs
Isolator and
25 seconds
for earth
switch
15 Number of terminal in All contacts & control circuits are to be wired up to control cabinet
control cabinet plus 24 spare terminals evenly distributed.
16 Rated Insulation levels
a) Full wave impulse withstand voltage (1.2/50 microsec.)
i) between line kVpeak ±2100 ±1425 ±1050 ±650
terminals and ground
ii) between terminals kVpeak ±2100 kVp ±1425 kVp ±1200 ±750
with isolator open impulse on impulse on
one terminal one terminal
and 455 kVp and 240 kVp
power power
frequency frequency
voltage of voltage of
opposite opposite
polarity on polarity on
other other
terminal terminal
b) Switching impulse withstand voltage (250/2500 micro-second) dry and wet
i) between line kV ± 1550 ± 1050 -NA- -NA-
terminals and ground peak
ii) between terminals kV 1175 kVp 900 kVp -NA- -NA-
with Isolator open peak impulse on impulse on
one terminal one terminal
and 650 kVp and 345 kVp
power power
frequency frequency
voltage of voltage of
opposite opposite
polarity on polarity on
other other
terminal terminal
c) One minute power frequency dry withstand voltage
i) between line kV rms 830 520 460 275
terminals and ground
ii) between terminals kV rms 1150 610 530 315
with isolator open
17 Minimum Corona KV rms 508 320 156 92
extinction voltage

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 15 of 18
Sl. Description Unit 800kV ISO 420kV ISO 245kV ISO 145kV ISO
No.
with Isolator in all
positions
18 Max. radio micro 2500 at 508 1000 at 266 1000 at 156 500 at 92
interference voltage volts kVrms kVrms kVrms kVrms
for frequency
between0.5 MHz and
2 MHz. in all
positions
19 Minimum Creepage distance
i) Phase to ground mm As per As per As per As per
Section- Section- Section-GTR Section-
GTR GTR GTR
20 Seismic acceleration As per As per As per As per
IS:1893 IS:1893 IS:1893 IS:1893
21 Thermal Rating of A 10 A 10 A 10 A 10 A
Auxiliary Contacts at 220 V DC at 220 V DC at 220 V DC at 220 V
DC
22 Breaking Capacity of 2 A DC with 2 A DC with 2 A DC with 2 A DC
auxiliary contacts circuit time circuit time circuit time with circuit
constant not constant not constant not time
less than 20 less than 20 less than 20 constant
ms ms ms not less
than 20 ms
Distance between m 6.0 4.0 2.5 -
support structures
foundations (within
same phase)
23 System neutral Effectively Effectively Effectively Effectively
earthing Earthed Earthed Earthed Earthed

Note: The above insulation levels are applicable for altitude up to 1000 meters
above M.S.L. For higher altitudes, suitable correction factor as per relevant IEC
shall be applied.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 16 of 18
2. Technical Parameters for 72.5 kV, 36 kV and 11 kV Isolator

Sl. Description Unit 72.5kV ISO 36kV ISO 12kV ISO

No.
1 Rated voltage kVrms 72.5 36 11
2 Rated frequency Hz 50 50 50
3 No. of poles Nos. 3 3 3
4 Design ambient °C 50 50 50
temperature
5 Type Outdoor, Outdoor, Outdoor,
Mechanically Mechanically Mechanically
gang operated gang operated gang operated
6 Rated current at A As per As per As per
50oC ambient requirement requirement requirement
temperature
7 Rated short time kA 25 kA for 3 sec 25 kA for 3 sec 25 kA for 3 sec
withstand current of
isolator and earth
switch
8 Rated dynamic short kAp 62.5kAp 62.5kAp 62.5kAp
time withstand
current of isolator
and earth switch
9 Temperature rise As per Table-3 of IEC-62271-1
over design ambient
temperature
10 Rated mechanical N As per IEC or as per value calculated in Section-
terminal load GTR whichever is higher
11 Mechanical Isolator-M1
Endurance Class E/S-M0
12 Operating Isolator - A.C. Isolator - Isolator -
mechanism of Motor operated Manual Manual
isolator/erathswitch E/S – Manual operated operated
operated E/S – Manual E/S – Manual
operated operated
13 No. of auxiliary Besides requirement of this spec., 5 NO + 5 NC contacts wired
contacts on each on each isolator to terminal block exclusively for Employer’s
isolator use in future.
14 No. of auxiliary Besides requirement of this spec., 3 NO + 3 NC contacts wired
contacts on each on each isolator to terminal block exclusively for Employer’s
earthing switch use in future.
14 Max. Operating time sec 12 sec. NA for manual NA for manual
operation operation

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 17 of 18
Sl. Description Unit 72.5kV ISO 36kV ISO 12kV ISO
No.
15 Number of terminal in All contacts & control circuits are to be wired up to control
control cabinet cabinet plus 24 spare terminals evenly distributed.

16 Rated Insulation levels

a) Full wave impulse withstand voltage (1.2/50 microsec.)
i) between line kVpeak ±325 ±170 -
terminals and ground
ii) between terminals kVpeak ±375 kVp ±180 kVp -
with isolator open
b) One minute power frequency dry withstand voltage
i) between line kV rms 140 70 -
terminals and ground
ii) between terminals kV rms 160 80 -
with isolator open
17 Minimum Creepage distance
i) Phase to ground mm As per Section- As per Section- As per Section-
GTR GTR GTR
20 Seismic acceleration As per IS:1893 As per IS:1893 As per IS:1893
21 Thermal Rating of A 10 A 10 A 10 A
Auxiliary Contacts at 220V/110V at 220V/110V at 220V/110V
DC DC DC
22 Breaking Capacity of 2 A DC with 2 A DC with 2 A DC with
auxiliary contacts circuit time circuit time circuit time
constant not constant not constant not
less than 20 ms less than 20 ms less than 20
ms
Distance between m As per layout
support structures
foundations (within
same phase)
23 System neutral Effectively Effectively Effectively
earthing Earthed Earthed Earthed

Note: The above insulation levels are applicable for altitude up to 1000 meters
above M.S.L. For higher altitudes, suitable correction factor as per relevant IEC shall
be applied.

Technical Specification, Section: Switchgear - ISOLATOR

C/ENGG/SPEC/SWGR/R11B, December 2018 Page 18 of 18
 MODEL TECHNICAL SPECIFICATION

SECTION: SWITCHGEAR - SURGE ARRESTER

(REV. NO. 11)

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 1 of 14
Following are the major changes made in the Technical specification, Section-
Switchgear - SA, Rev. 11:

Clause No. Major Modification

3.0 (m) Constructional features specified for
624kV SA
Annexure-I Cantilever strength modified for SA

Notes: The above is the list of major changes with respect to previous revision
(Rev. 10). However, the bidders are advised to read the entire section for other
changes and quote accordingly.

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 2 of 14
 SWITCHGEAR – SURGE ARRESTERS

CONTENTS

Clause.No. Description Page No.

1.0 General 4

2.0 Duty requirements 4

3.0 Constructional Features 6

4.0 Fittings And Accessories 7

5.0 Tests 8

6.0 Mandatory Spares 9

7.0 Technical Parameters 10

8.0 Pre-Commissioning Tests 10

Annexure-I

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 3 of 14
 SWITCHGEAR - SURGE ARRESTERS

1.0 GENERAL:

1.1 The Surge arresters shall conform to IEC: 60099-4 except to the extent
modified in the specification and shall also be in accordance with
requirements under Section -GTR.

1.2 The Surge Arrestors shall be designed for use in the geographic and
meteorological conditions as given in Section-GTR and Section-
Project.

2.0 DUTY REQUIREMENTS:

a. The surge arresters shall be of heavy duty station class and gapless
type without any series or shunt gaps.

b. The surge arresters shall be capable of discharging over-voltages

occurring during switching of unloaded transformers, reactors and long
lines.

c. 420 kV class Surge arresters shall be capable of discharging of severe

re-energisation switching surges on a 400kV, 450km long line with
Surge impedance of 300 ohms and capacitance of 11.986nF/km and
over voltage factor of 2.3 p.u. Similarly, 800kV class Surge arresters
shall be capable of discharging of severe re-energisation switching
surges on a 765kV, 450km line with Surge impedance of 270 ohms and
capacitance of 13 nF/km.

d. 420kV class arrester shall be capable of discharging energy equivalent

to class 4 of IEC for a 420kV system on two successive operations
followed immediately by 50 Hz energisation with a sequential voltage
profile as specified below:

650 kVp for 3 peaks

575 kVp for 0.1 Sec

550 kVp for 1 seconds

475 kVp for 10 seconds

800kV class arrester shall be capable of discharging energy

equivalent to class 5 of IEC for an 800kV system on two
successive operations followed immediately by 50 Hz energisation
with a sequential voltage profile as specified below:

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 4 of 14
 1000 kVp for 3 peaks

910 kVp for 0.1 Sec

885 kVp for 1 seconds

866 kVp for 10 seconds

e. 245/145 kV class arrester shall be capable for discharging energy

equivalent to class 3 of IEC for 245/145 kV system on two
successive operations.

f. The surge arresters shall be suitable for withstanding forces as

defined in Section-GTR.

g. The reference current of the arresters shall be high enough to

eliminate the influence of grading and stray capacitance on the
measured reference voltage.

h. The surge arresters are being provided to protect the following

equipment whose insulation levels are indicated in the table given
below:-

Equipment to Lightning Switching Lightning Switching Lightning Lightning

be protected impulse(kVp) surge(kV) impulse(kVp) surge(kV) impulse(kVp) surge(kVp)
for 800 kV for 800 for 420 kV for 420 for 245 kV for 145 kV
system kV system kV ystem system system
system
Power + 1950 + 1550 + 1300 + 1050 + 950 + 550
transformer
+ 1950 + 1550 + 1300 + 1050 + 950 + 550
Reactor
Instrument + 2100 + 1550 + 1425 + 1050 + 1050 + 650
Transformer
CB/Isolator + 2100 + 1550 + 1425 + 1050 + 1050 + 650
Phase to
ground
CB/Isolator + 2100 (- + 1140 (- + 1425 (- + 900 (- + 1050 (for + 750 (for
Across open /+457) /+653) /+240) /+345) CB) Isolator)
contacts + 1200 (for
Isolator)

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 5 of 14
 i. The duty cycle of CB installed in 800/420/245/145 kV System of the
Employer shall be O-0.3 sec-CO-3 min-CO. The Surge Arrester
shall be suitable for such circuit breaker duties in the system.

3.0 CONSTRUCTIONAL FEATURES:

The features and constructional details of surge arresters shall be in

accordance with requirement stipulated hereunder:

a) The non-linear blocks shall be of sintered metal oxide material.

These shall be provided in such a way as to obtain robust
construction, with excellent mechanical and electrical properties
even after repeated operations.

b) The surge arresters shall be fitted with pressure relief devices

suitable for preventing violent failure of insulator housing and
providing path for flow of rated fault currents in the event of arrester
failure.

c) The arresters shall not fail due to arrester porcelain insulator

contamination.

d) Seals shall be provided in such a way that these are always

effectively maintained even when discharging rated lightning
current.

e) Outer insulator for 90kV and above shall be polymer conforming to

requirements stipulated in Section-GTR. For 60kV and below, outer
insulator shall be porcelain/polymer conforming to requirements
stipulated in Section-GTR. Terminal connectors shall conform to
requirements stipulated under Section-GTR.

The outer insulator housing shall be so coordinated that external

flashover will not occur due to application of any impulse or
switching surge voltage upto the maximum design value for
arrester.

f) The end fittings shall be made of corrosion proof material and

preferably be nonmagnetic.

g) The name plate shall conform to the requirements of IEC

incorporating the year of manufacture.

h) The following details shall be furnished for quality checks:

i) The heat treatment cycle details alongwith necessary quality

checks used for individual blocks and insulation layer formed
across each block.

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 6 of 14
 ii) Metalizing coating thickness for reduced resistance between
adjacent discs

i) The manufacturer will submit Data for rejection rate of ZnO blocks
during manufacturing/operation for the past three years.

j) The sealing arrangement of the Surge Arrester stacks shall be done

incorporating grooved flanges with the O-rings/elliptical cross-
section gaskets of Neoprene or Butyl rubber.

k) Arresters shall be of hermetically sealed units, self supporting

construction, suitable for mounting on tubular support
structures. However, 765 kV Surge Arrester shall be suitable
for mounting on lattice type support structures.

l) For 624kV Surge arresters, number of stacks shall be three (3).

The FRP tube outer diameter shall be 300mm (min) and FRP
tube thickness shall be 25mm (min).

4.0 FITTINGS AND ACCESSORIES:

a) Arresters shall be complete with insulating base having provision for

bolting to flat surface of structure.

b) Self contained discharge counters, suitably enclosed for outdoor

use and requiring no auxiliary or battery supply for operation shall
be provided for each single pole unit alongwith necessary
connection arrangement. Suitable leakage current meters should
also be provided. The reading of milliammeter and counters shall be
visible through an inspection glass panel. The terminals shall be
robust and of adequate size and shall be so located that incoming
and outgoing connections are made with minimum possible bends.
The surge counter shall be provided with a potential free contact
rated for 220 Volt (DC) which shall close whenever a surge is
recorded by the surge monitor. Necessary arrangement shall be
provided for extending the contact information to Substation
Automation System/RTU.

c) Surge monitor consisting of discharge counters and milliammeters

should be suitable to be mounted on support structure of the
arrester and should be tested for IP66 degree of protection. The
standard supporting structure for surge arrester should be provided
with a mounting pad, for fixing the surge monitor. The surge monitor
should be suitable for mounting on this standard mounting pad. Also
all nuts, bolts, washers etc. required for fixing the surge monitor
shall be supplied by the Contractor.

The arrangement for Surge Monitor enclosure fixing to the structure

shall be at its rear/bottom. Connection between the Surge Arrester

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 7 of 14
 base and Surge Monitor shall be through a 2.0 m (minimum) long
insulated copper rod/strip of at least 75 sq.mm cross sectional area.
The cable shall be terminated at rear/bottom side of the Surge
Monitor. The gaskets of the surge monitors shall be of Neoprene,
Butyl or equivalent material.

d) Grading/corona rings shall be provided on each complete arrester

unit, as required. Suitable terminal connectors shall be supplied by
the Contractor.

5.0 TESTS:

5.1 In accordance with the requirements stipulated under Section-GTR, the

surge arresters should have been type tested as per IEC/IS and shall be
subjected to routine and acceptance tests in accordance with IEC.

Test reports for all type tests as per IEC-60099-4 including following
additional type tests (additional type tests are required for Surge
Arresters above 72.5 kV class only) shall also be submitted for the
Employer’s review:

i) Radio interference voltage test.

ii) Seismic withstand test as per Annexure-B of Section-GTR.

iii) Accelerated aging test.

Test to verify the Power frequency versus time characteristics:

Temporary over voltage profile for 216 kV and below rated arresters to be
mutually agreed.

Each metal oxide block of surge arresters shall be tested for the
guaranteed specific energy capability in addition to the
routine/acceptance test as per IEC: 60099-4.

5.2 (a) Acceptance Tests:

1. Measurement of power frequency reference voltage of the arrester

units.

2. Lightning Impulse Residual voltage on arrester units as per IEC

clause 6.3.2.

3. Internal Ionisation or partial Discharge test.

(b) Special Acceptance Test:

1. Thermal stability test on three sections as per IEC Clause 7.2.2.

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 8 of 14
 2. Aging test for Zinc oxide blocks is to be carried out on 3 samples for
72 hours at maximum continuous over voltage (MCOV) and at a
temperature of 115°C. Acceptance norm being I r (resistive
current)/watt loss shall remain or decrease at the end of 72 hrs from
the value taken after 1 hour of start of test.

3. Wattloss test.

(c) Routine Tests:

1. Sealing test: Water dip test at 1.5m depth from top of Surge Arrestor
for 30 minutes shall be performed during assembly of Surge
Arrester stacks (followed by other routine tests, i.e. P.D.
Measurement, Reference Voltage, Residual Voltage & IR
measurement).

2. Measurement of reference voltage.

3. Residual voltage test of arrester unit.

4. Internal Ionisation test or partial discharge test.

5. Verticality check on completely assembled Surge arresters as a

sample test on each lot.

(d) Routine Tests on Surge Monitors:

The Surge monitors shall be connected in series with the test

specimens during residual voltage and current impulse withstand
tests to verify efficacy of the same. Additional routine/ functional
tests with one 100A and 10kA current impulse (8/20 micro sec.)
shall also be performed on the Surge monitor.

Surge monitors shall be routinely tested for water dip test at 1.5m
depth for 30 minutes. No water vapors shall be visible on the
monitor glass.

(e) Routine Tests on insulators

All routine tests shall be conducted on the hollow column

insulators as per IEC 62155. Polymer housing shall be tested in
accordance to IEC-61462.

6.0 MANDATORY SPARES:

Bidder shall include in his proposal mandatory spares as mentioned in

the Bidding Documents.

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 9 of 14
7.0 TECHNICAL PARAMETERS: The technical parameters shall be as
per enclosed Annexure-I.

8.0 PRE-COMMISSIONING TESTS

8.1 An indicative list of tests is given below.

(a) Operation check of LA counters.

(b) Insulation resistance measurement

(c) Capacitance and Tan delta measurement of individual stacks.

(d) Third harmonic resistive current measurement (to be conducted after

energisation.)

(e) Contractor shall perform any additional test based on specialties of

the items as per the field Q.P./Instructions of the equipment
manufacturer or Employer without any extra cost to the Employer.
The Contractor shall arrange all instruments required for conducting
these tests alongwith calibration certificates at his own cost.

For pre-commissioning procedures and formats for Surge Arresters,

Doc.No.: CF/SA/08/R-4 dtd-01/04/2013 under POWERGRID Document
no. D-2-01-03-01-04 will be reference document. This document will be
available at respective sites and shall be referred by the contractor.

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 10 of 14
 Annexure-I

1. Technical Parameters for 765kV, 400kV, 220kV and 132kV Surge

Arresters (with Polymer Housing)

Sl. Description Unit 800kV SA 420kV SA 245kV SA 145kV SA

No.
1 Nominal System kV, rms 765 400 220 132
Operating voltage
2 Rated frequency Hz 50 50 50 50
3 No. of Poles No. 1 1 1 1
4 Design ambient °C 50 50 50 50
temperature
5 Rated arrester kV 624 336 216 120
voltage
6 Continuous kV 490 267 168 102
operating voltage
at 50 deg.C
7 Nominal discharge 20 kA of 8/20 20 kA of 8/20 10 kA of 8/20 10 kA of 8/20
current microsecond microsecond microsecond microsecond
wave wave wave wave
8 Discharge current 20 kA of 8/20 20 kA of 8/20 10 kA of 8/20 10 kA of 8/20
at which insulation microsecond microsecond microsecond microsecond
co-ordination will wave wave wave wave
be done
9 Minimum kJ/kV 13kJ/kV 12kJ/kV 5kJ/kV 5kJ/kV
discharge
capability (referred
to rated arrester
Voltage) or
corresponding to
minimum
discharge voltage
as per clause-2.0
(d) whichever is
higher
10 Max. switching kVp 1180 (at 1kA) 670(at 2kA) 500 (at 1kA) 280 (at 1kA)
surge residual 1220 (at 2kA) 650 (at
voltage 500A)
11 Max. residual voltage at
i) 5kA kVp - - 560 310
ii) 10 kA nominal kVp - 800 600 330
discharge current
iii) 20 kA nominal kVp 1480 850 - -
discharge current

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 11 of 14
Sl. Description Unit 800kV SA 420kV SA 245kV SA 145kV SA
No.
iv) Steep fronted wave kVp 1480 925 - -
residual voltage at
20 kA
12 Long duration 5 4 3 3
discharge class {Refer clause {Refer clause
2.0(d)} 2.0(d)}
13 High current short kAp 100 100 100 100
duration test
value(4/10 micro
second wave)
14 Current for kA rms 63 40 / 50 / 63 40 / 50 (as 40
pressure relief test (as applicable)
applicable)
15 Low current long As per IEC
duration test value
16 Insulation Level
a) Full wave impulse withstand voltage (1.2/50 microsec.)
i) Arrester Housing kVpeak As per ±1425 ±1050 ±650
IEC:60099-4
b) Switching impulse withstand voltage (250/2500 micro-second) dry and wet
i) Arrester Housing kV As per ± 1050 -NA- -NA-
peak IEC:60099-4
c) One minute power frequency dry withstand voltage
i) Arrester Housing kV rms 830 630 460 275

17 Max. radio micro 2500 at 508 500 at 266 500 at 156 500 at 92
interference volts kVrms kVrms kVrms kVrms
voltage for
frequency
between0.5 MHz
and 2 MHz. in all
positions
18 Minimum mm As per As per As per As per
Creepage distance Section-GTR Section-GTR Section-GTR Section-GTR
19 Cantilever kg 500 350 150 150
Strength (for 1
minute withstand
test)
20 Maximum mm 200 200 200 200
deflection at
above cantilever
load
21 Seismic As per As per As per As per
acceleration IS:1893 IS:1893 IS:1893 IS:1893

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 12 of 14
Sl. Description Unit 800kV SA 420kV SA 245kV SA 145kV SA
No.
22 Partial Discharge ≤ 10pC ≤ 10pC ≤ 10pC ≤ 10pC
at 1.05 COV
23 System neutral Effectively Effectively Effectively Effectively
earthing Earthed Earthed Earthed Earthed

Note: The above insulation levels are applicable for altitude up to 1000 meters
above M.S.L. For higher altitudes, suitable correction factor as per relevant
IEC shall be applied.

2. Technical parameters for 72.5kV, 36 kV and 11 kV CLASS SURGE ARRESTER

(with Porcelain /Polymer Housing)

Sl. Description Unit 72.5kV SA 36kV SA 12kV SA

No.
1 Nominal System kV, rms 66kV 33kV 11kV
Operating voltage
2 Rated frequency Hz 50 50 50
3 No. of Poles No. 1 1 1
4 Design ambient °C 50 50 50
temperature
5 Rated arrester voltage kV 60 30 9
6 Continuous operating kVrms 51 25 7.2
voltage at 50 deg.C
7 Nominal discharge kA 10 kA of 8/20 microsecond wave
current
8 Discharge current at kA 10 kA of 8/20 microsecond wave
which insulation co-
ordination will be done
9 Minimum discharge kJ/kV 4 4 4
capability (referred to
rated arrester Voltage)
or corresponding to
minimum discharge
voltage as per clause-
2.0 (d) whichever is
higher
10 Max. switching surge kVp 136 (at 1kA) 72 (at 1kA) 22.4 (at 1kA)
residual voltage
11 Max. residual voltage at
i) 5kA kVp 160 85 26
ii) 10 kA nominal kVp 170 90 28

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 13 of 14
 discharge current
iii) 20 kA nominal kVp 190 -- --
discharge current
iv) Steep fronted wave kVp 190 -- --
residual voltage at 10
kA
Long duration 3 2 2
discharge class
13 High current short kArms 100 100 100
duration test
value(4/10 micro
second wave)
14 Current for pressure kAp 40 25 25
relief test
15 Low current long As per IEC
duration test value
16 Insulation Level
a) Full wave impulse withstand voltage (1.2/50 microsec.)
i) Arrester Housing kVpeak 325 170 75
b) One minute power frequency dry withstand voltage
i) Arrester Housing kV rms 140 70 28

17 Minimum Creepage mm As per As per As per

distance Section-GTR Section-GTR Section-GTR
18 Cantilever Strength kg 150 150 150
(for 1 minute
withstand test)
20 Maximum deflection mm 200 200 200
at above cantilever
load
21 Seismic acceleration As per As per As per
IS:1893 IS:1893 IS:1893

Note: The above insulation levels are applicable for altitude up to 1000 meters
above M.S.L. For higher altitudes, suitable correction factor as per relevant
IEC shall be applied.

Technical Specification, Section: Switchgear - SA

C/ENGG/SPEC/SWGR/R11, January 2017 Page 14 of 14
1. TELECOMMUNICATION SYSTEMS

1.1 General

This section describes the Fiber Optic Communication equipment characteristics for communication
system to be installed under the project. The sub-systems addressed within this section are:

(1) Fiber Optic Transmission System (FOTS)

(2) DDF and Cabling
(3) Craft Terminal based Network Management System (NMS)
(4) Repeater Shelter
(5) FO Approach Cable
(6) FODP

The equipment supplied shall support existing communication network for Power system operational
requirements.

The security related requirements of the equipment shall be as per DoT (Department of
Telecommunication) guidelines and all similar security requirements as amended by DoT on time to
time basis shall be followed/complied by the vendor at no additional cost to Employer till the
implementation of the project.

The manufacturer shall allow the Employer and/or its designated agencies to inspect the hardware,
software, design, development, manufacturing, facility and supply chain and subject all software to a
security /threat check any time during the supplies of equipment

The contractor shall ensure that the supplied equipments have been got tested as per relevant
contemporary Indian or International Security Standards e.g. IT and IT related elements against
ISO/IEC 15408 standards, for Information Security Management System against ISO 27000 series
Standards from an authorized and certified agency/lab.

In case of any deliberate attempt for a security breach at the time of procurement or at a later stage
after deployment/installation of the equipment or during maintenance, liability and criminal
proceedings can be initiated against the Contractor as per guidelines of DoT and any other
Government department.

The primary function of the equipment is to provide a highly reliable voice and data communication
system for grid operation in support of the SCADA/EMS, RTUs & PMUs and for new technological
requirements of Power System Operation such as Special Protection Scheme, Grid Security Expert
System, Load Management, Advanced Protection System & Substation Automation System. A brief
summary of the system requirements is as follows:

(a) High speed E1 channel support

(b) 64kbps & nx64kbps data channel support as required

(c) Low speed (300 -1200 bps) data channel support as required

(d) Voice (2 wires, 4 wires) channel support and integration with Employer’s/RLDC’s EPABX
system. The details of EPABX System shall be provided during detailed engineering.

(e) Data transport supporting Network Management channels

Rev-02
 (f) The connectivity envisaged between Substation and Control Centre over TCP-IP using
Ethernet interface for various services of data and voice such as for PMUs, RTUs, VOIP etc.

2.1 Fibre Optic Transmission System

2.1.1 General Network Characteristics

The SDH node shall be used for interconnection of terminal Substation to the fibre optic network and
shall be based on the Synchronous Digital Hierarchy (SDH) having bit rate of STM-4/16 as specified in
BPS. The contractor shall follow numbering plan for the proposed voice communication system.

The transmission equipment to be supplied shall be a complete SDH node (add-drop multiplexer)
providing all the features e.g. protection and performance monitoring.
This will be used for delivering E1 as per ITU-T G.703 and Giga/fast Ethernet services except repeater
stations. In case other interface such as Asynchronous Sub-channel data card (RS232/V.24/V.28),
Synchronous data card (V.36/X.21), 2 wire voice channel card or 4 wire (E&M) voice channel card
as required, shall be supplied either in the same equipment or as independent PDH equipment.

The Contractor shall supply the equipment as per the technical specification. The deliverables
shall include all installation materials necessary for successful installation and
commissioning of the equipment viz. AC & DC power supply cabling, Krone type/75Ω BNC type
Digital Distribution Frame (DDF) in enclosure, optical patch cords for FODP-to-equipment and
equipment-to-equipment connection, optical attenuator (5dB/10dB), flexible conduits etc. as per site
requirement. Additionally one (1) pair of optical patch cord per SDH node will be supplied as
spare. User Manual, System Guide shall be delivered with each equipment. The Contractor shall
provide all required minor civil works necessary for full connectivity as required.

Equipment redundancy and Automatic Protection Schemes (APS) are specified in the Table 1.
The failure of one element shall not prevent the use of any other that has not failed.

Table 1
Equipment Redundancy Requirements Summary

Fiber Optic transmission Equipment :

Power Supply & Converters ------------------------------ 1:1 APS or distributed power supply

Common Control* Cards ----------------------------------- 1:1 APS

* = Common control cards which are essentially

required for operation of the equipment.

The offered equipment shall support automatic switchover function between the redundant
modules and all required modules and hardware to support the automatic switch over shall be
provided by the Contractor.

At any digital signal level, reapplication of a lost signal shall result in automatic
resynchronization and full restoration to normal operation without manual intervention. All
alarms incident to the signal failure, shall be automatically cleared at the equipment, rack and
monitoring levels and normal operation indications restored and reported if applicable.
The offered transmission equipment (SDH node) shall support optical link of at least 250 Km for STM-4
and 225Km for STM-16 without any repeater station in between. If required, wavelength translator/
Rev-02
 optical amplifier shall be provided by the contractor.

2.1.2 Features of Transmission Equipment

 Aggregate interface shall be STM-4/16, with three (3)/Five (5) MSP protected directions (as required
in BPS). If bidder is offering equipment with multifunction cards such as cross-connect or control card
with optical interface/SFP or tributary interface, such type of multifunction card shall be considered as
Common control card and shall be the part of base equipment. In case optical interface/SFP is embedded
with control card, the adequate number of optical interface/SFPs shall be offered to meet the redundancy
requirements of the specifications. Further, main and protection channel shall be terminated on separate
cards. Aggregate interface of STM-4/16 shall have FC/PC. In case other than FC-PC connector is
provided in the equipment, suitable patch cord with matching connector are to be provided to connect
with FODP.

 All software and hardware shall support IPv4 and IPv6 simultaneously (dual stack).

 SDH equipment shall support dual power feed with redundancies for Power supply unit and Control unit
in each rack.

 Minimum 16 nos. x 2 Mbit/s per card, 120Ω/75Ω tributary interface compliant to ITU-T G.703, G.704
with suitable connector

 Ethernet interface shall have minimum 8 nos. per card of RJ-45 port for ingress and egress of Ethernet
data (Ethernet over SDH) at 10/100/1000 Base-T speeds/standards (ITU-T G.7041GFP capsulation).
Ethernet shall support LCAS feature. It shall support full throughput upto 1000 Mbps on Ethernet
port by virtual concatenation of requisite no. of VC-12.There shall be the provision of
“Auto Negotiation” and “Flow control” Enabling/disabling through NMS of the system. Also
there shall be provision of configuring the equipment for unrestricted nxVC12 bandwidth (upto
1000Mbps). The Ethernet interface shall support VLAN (IEEE 802.IP/Q), spanning tree (IEEE 802.ID)
quality of service. The protection scheme for Ethernet traffic should be ERPS based.

 Services channel shall be provided as a function of the SDH equipment and shall be equipped
with Service Channel Muldems that shall provide at a minimum: One voice channel (order wire)
with analog interface (0.3 to 3.4 kHz) and one data channel. There shall be a facility to extend
the line system order-wire to any other system or exchange lines.

 ADM configuration for traffic protection by using SNCP & MSP.

 Synchronization: The substation GPS can be used for extending synchronization to equipment.
Alternately existing network Master Clock can be used for synchronization.

 ISM (In Service Monitoring) circuitry shall be provided as a function of the SDH equipment. Local visual
alarm indicators shall be provided on the equipment, as a rack summary alarm panel. Alarms shall be as
per ITU-T Standards G.774, G.783 and G.784.

 Downloading of software shall be possible from remote.

 Shall have Embedded Communication Channel (ECC), ports (Ethernet/RS232) for craft terminal and
management interface and shall support DCC pass through.

 DCN implementation through protected VC12. Support DCN grooming in VC12.

Rev-02
  Pre-connectorised Optical patch cords shall be of G.625D fibre. The Patch cord return loss shall be
equal to or better than 40 dB and insertion loss equal to or less than 0.5 dB. Fiber jumpers shall
be of sufficient lengths as to provide at least 0.5m of service loop.

 Manageable by Craft Terminal programme. It shall support performance monitoring, remote software
upgrade, configuration management from remote as well as local craft terminal. The craft terminal shall
have minimum configuration of 2.4 GHz, 8 GB RAM, 256 MB Video Graphics Memory, DVD RW
drive, 320 GB Hard Disk Drive, keyboard, mouse/trackball etc., serial/USB (2.0) ports to accommodate
printers, IEEE 802.11a/b/g wireless LAN, Bluetooth, Internal/external Data/Fax modem and a battery
back-up of at least 3 hours. VDUs shall be 15" TFT active matrix color LCD with a minimum resolution
of 1024 X 768.

 Local Craft Terminal will be provided with requisite software for performing all element level
management functions viz. configuration management, fault management, performance management
etc.

 Shall be operated with -48 V DC Power Supply. DC power interface shall be suitable to work on a
nominal voltage of -48V ± 20%.

 Compact design suitable for installation in 19” rack.

 The bidder shall be required to provide only Optical Interface/SFP to be installed in the existing/third
party SDH equipment at few locations if any. The bidder has to ensure compatibility of the supplied
Optical Interface/SFP for the same.

2.1.2.1 Network Monitoring (Craft Terminal based)

 Manageable by Craft Terminal programme. It shall support performance monitoring, remote software
upgrade, configuration management from remote as well as local craft terminal. The craft terminal shall
have minimum configuration of 2.4 GHz, 8 GB RAM, 256 MB Video Graphics Memory, DVD RW
drive, 320 GB Hard Disk Drive, keyboard, mouse/trackball etc., serial/USB (2.0) ports to accommodate
printers, IEEE 802.11a/b/g wireless LAN, Bluetooth, Internal/external Data/Fax modem and a battery
back-up of at least 3 hours. VDUs shall be 15" TFT active matrix color LCD with a minimum resolution
of 1024 X 768. However, the configuration shall be finalized during detailed engineering as per the latest
industrial standards.
 Local Craft Terminal will be provided with requisite software for performing all element level
management functions viz. configuration management, fault management, performance management
etc.
 Bidder shall provide the telecom equipment which can be integrated with the existing NMS server/s of
the respective RLDC/ SLDC. The details of existing NMS server/s shall be provided during detailed
engineering or to be ascertained by Bidder conducted during site survey.

2.1.3 Optical Link Budget Calculations

The fibre optic link budget calculations shall be calculated based upon the following criteria:

(1) Fibre attenuation: The fibre attenuation shall be taken to be the guaranteed maximum fibre
attenuation i.e. 0.21 dB/Km @1550nm and 0.35 dB/km @1310nm.

(2) Splice loss: Minimum 0.05 dB per splice. One splice shall be considered for every 3 kms.

(3) Connector losses: Losses due to connectors shall be considered to be minimum 1.0 dB per link.

(4) Equipment Parameters: The equipment parameters to be considered for link budget calculations
Rev-02
 shall be the guaranteed “End of Life (EOL)” parameters. In case, the End of Life parameters are not
specified for the SDH equipment, an End of Life Margin of at least 2 dB shall be considered and a
similar margin shall be considered for optical amplifiers.

(5) Optical path Penalty: An optical path penalty of at least 1 dB shall be considered to account for total
degradations due to reflections, inter symbol interference, mode partition noise and laser chirp.

(6) Maintenance Margin: A maintenance margin of at least 2.5 dB/100Km shall be kept towards
cabling, repair splicing, cable ageing and temperature variations etc.

(7) Other losses: Other losses, if any required specifically for system to be supplied shall also be
suitably considered.

(8) Dispersion: The fibre dispersion shall be taken to be the guaranteed maximum dispersion i.e. 18
ps/nm.Km @1550 nm & 3.5 ps/nm.km @ 1310 nm for DWSM fibres.

(9) Bit Error Rate: The link budget calculations shall be done for a BER of 10-10.

The bidders shall determine the total link loss based on the above parameters and shall submit the
system design (including link budget calculations) for each fibre optic link during detailed engineering.

For finalising the FOTS system design & BOQ, above methodology shall be adopted taking into
account fibre attenuation, dispersion and splice loss determined during the detailed engineering.
Accordingly, additions and deletions from the contract shall be carried out based on unit rates indicated
in the contract.
2.1.4 Technical Requirement of Repeater Shelter

The detailed requirements for Repeater Shelter are attached at ‘Annexure – II

2.2 Fibre Optic Approach Cable

For purposes of this specification, a fibre optic approach cable is defined as the Armoured underground
fibre optic cable required to connect Overhead Fibre Optic Cable (OPGW) between the final in line
splice enclosure on the gantry / tower forming the termination of the fibre cable on the power line and the
Fibre Optic Distribution Panel (FODP) installed within the building. The estimated fibre optic approach
cabling length requirements are indicated in the appendices. However, the Contractor shall supply &
install the optical fibre approach cable as required based on detailed site survey to be carried out by the
Contractor during the project execution and the Contract price shall be adjusted accordingly. Approach
Cable shall consist G.652D DWSM Fibers.

2.2.1 Basic Construction

The cable shall be suitable for direct burial, laying in trenches & PVC/Hume ducts, laying under false
flooring and on indoor or outdoor cable raceways. The jacket shall conform to ASTM D1248 for density.

2.2.2 Optical Electrical and Mechanical Requirements

Approach cable shall contain fibres with identical optical/ physical characteristics as those in the OPGW
cables. The cable core shall comprise of tensile strength member(s), fibre support/bedding structure, core
wrap/bedding, and an overall impervious jacket.

2.2.3 Installation Of Approach Cable

The existing cable trenches/ cable raceways proposed to be used shall be identified in the survey report.
The Contractor shall make its best effort to route the cable through the existing available cable trenches.

Rev-02
 Where suitable existing cable trenches are not available, suitable alternatives shall be provided after
Employer approval.

Suitable provisions shall be made by the Contractor to ensure adequate safety earthing and insulated
protection for the approach cable.

All required fittings, supports, accessories, ducts, inner ducts, conduits, risers and any item not specially
mentioned but required for laying and installation of approach cables shall be supplied and installed by
the Contractor.

2.3 Optical Fibre Termination and Splicing

Optical fibre terminations shall be done in Fibre Optic Distribution Panels (FODP) designed to provide
protection for fibre splicing of preconnectorized pigtails and to accommodate connectorized termination
and coupling of the fibre cables. The Contractor shall provide rack /wall mounted Fibre Optic
Distribution Panels (FODPs) sized as indicated in the appendices and shall terminate the fibre optic
cabling up to the FODPs. The location of FODP rack shall be fixed by the Contractor, with the
Employer’s approval.

2.3.1 Fibre Optic Distribution Panel

At each location requiring the termination of at least one fibre pair within a cable, all fibres within that
cable shall be connectorized and terminated in Fibre Optic Distribution Panels in a manner consistent
with the following:

(a) All fibre optic terminations shall be housed using FODPs provisioned with splice organizers and
splice trays. All fibres within a cable shall be fusion spliced to preconnectorized pigtails and fitted to the
"Back-side" of the provided fibre optic couplings.

(b) FODPs shall be suitable for use with each of the cable types provided as part of this contract. FODPs
shall accommodate pass-through splicing and fibre terminations.

(c) FODPs for indoor use shall be supplied in suitable cabinets/racks with locking arrangement.

(d) The FODP shall be of corrosion resistant, robust construction and shall allow both top or bottom entry
for access to the splice trays. Ground lugs shall be provided on all FODPs and the Contractor shall ensure
that all FODPs are properly grounded. The FODP shall meet or exceed ingress protection class IP55
specifications.

(e) Flexible protection shall be provided to the patch cord bunches going out from FODP cabinet to other
equipment cabinet.

3 Environmental, EMI, Power Supply Cabling and Earthing Requirements

 Equipment shall operate in accordance with the Environmental Operating limits as shown in Table-2:

Table -2
Environmental Operating Limits

Temperature Range: (Un Controlled Environment)

Specification 0 to 45°C
Operation without damage -10 to 55°C
Shipping/storage
-40 to 60°C

Relative Humidity, non-condensing Upto 90%

Rev-02
 Elevation:
Operating to 3,000 m
Non-operating to 10,000 m

 Equipment shall be properly shielded against radiated emissions at each location.

 Power Distribution and Protection: Power supplies/converters for communications equipment shall use -
48Vdc uninterrupted primary source power. The Employer will furnish only one power source.
Contractor shall provide required distribution panels, circuit breakers, appropriate panel disconnects and
all cabling, fusing, switching required. Distribution Panel feeders, Panel Disconnects, distribution panels
and circuit breakers shall be sized and equipped to support at least 100% expanded load requirements.
The Contractor shall also be responsible for Load Balancing.

 Contractor shall provide equipment and rack safety earthing in full compliance with EMI/EMC
requirements as per relevant international standards.

 Equipment cabinet (enclosure) shall be designed 19 inch, free standing but shall be mounted on the
floor. The dimensions of the cabinet shall be minimum 2200mmx600mmx600mm. All doors and
removable panels shall be fitted with long life rubber beading. All panels shall be fabricated from
minimum 2.0mm thickness steel sheet. However, for racks with load bearing Aluminium extrusion frame,
door panels and side panels may be fabricated from minimum 1.6mm thickness steel sheet and the top &
bottom panels shall be fabricated from minimum 2.0mm thickness steel sheet. Equipment cabinet
(enclosure) shall be dust and moisture proof as per IP41 specification or better (supporting
certificates/documents shall be submitted during detailed engineering).

 The Contractor shall provide all required minor civil works necessary for full connectivity as required in
the Contractor’s scope of work.

Any other miscellaneous items which may be required for successful interfacing for establishment of
end-to-end communication is deemed to be included in the scope of the Contractor.

4 TESTING

All materials furnished and all work performed under this Contract shall be inspected and tested. The
entire cost of testing for factory & site acceptance, routine tests, production tests and other test during
manufacture & site activities specified herein shall be treated as included in the quoted unit price of
materials, except for the expenses of Inspector/Employer’s representative. All tests shall be witnessed by
the Employer and/or its authorized representative (hereinafter referred to as the Employer) unless the
Employer authorizes testing to proceed without witness.

"Type Tests" shall be defined as those tests which are to be carried out to prove the design, process of
manufacture and general conformity of the materials to this Specification. All equipment being supplied
shall conform to type tests as per Annexure-I of technical specification. The test reports submitted shall
be of the tests conducted within last five (5) years. In case the test reports are older than five (5) years, the

Rev-02
 Contractor shall repeat these tests at no extra cost to the purchaser. In the event of any discrepancy in the
test reports or any type tests not carried out, same shall be carried out by Contractor without any
additional cost implication to the Employer. Type Tests shall be certified or performed by reputed
laboratories using material and equipment data sheets and test procedures that have been approved by the
Employer.

Equipments to be delivered shall be tested at factory before despatch as per approved

procedure. Factory Acceptance Test shall demonstrate the technical characteristics of the equipment in
relation to this specification and approved drawings and documents. The Contractor shall provide
procedures for installation and site acceptance test. The site acceptance testing will comprise of
end- to-end testing between the terminal stations and RLDC/SLDC and RTAMC/other CC end.

The detailed requirements for Type Test, Factory Acceptance Test and Site Acceptance Test are attached
at ‘Annexure – I

5 TRAINING

The Contractor will provide a training of suitable duration on supplied SDH equipment for
Employer’s personnel to provide working knowledge of the equipment, operation and diagnostic
tools, supervision and monitoring using local craft terminal. The training may be provided by the
Contractor or its sub-vendor at the site itself, preferably prior to installation, and will include training
materials, presentation equipment, and all associated expenses. No separate charges for training shall be
payable to the Contractor.

6 SUPPORT SERVICES

Throughout design, implementation, factory testing, and field installation and testing, the Contractor shall
supply consulting assistance, as required by the Employer for site preparation, field installation, and other
areas where technical support may be required.

The Contractor shall be responsible for minor facility renovation, and maintenance of the supplied system up
to and including successful completion of the Site Acceptance Test.

After final acceptance of the communications equipment, the Contractor shall offer continuing technical
support and spare parts for the communication equipment for a minimum period of 15 years from
operational acceptance by the employer or 7 years after the declaration of withdrawal of equipment from
production whichever is earlier. However the termination of production shall not occur prior to Operational
Acceptance of the system by the Employer. Some locations have existing SDH & MUX equipment. The
traffic may be switched over to new fibre optic communication equipment in phase manner. The Contractor
shall review the Employer existing equipment make, integration & switch over recommendation and prepare
a detailed field implementation plan.

6.1.1 Technical Support

Consultation with Contractor's technical support personnel and trained field service personnel shall
be readily available on a short-term/long-term basis to assist the Employer personnel in
maintaining, expanding, and enhancing the telecommunication network upon expiration of the
warranty period.

6.1.2 Contractor’s Future Hardware/Software Changes

The Employer shall be informed of all alterations or improvements to the hardware supplied under
this Specification. The Employer shall be placed on the Contractor's mailing list to receive
Rev-02
 announcements of the discovery, documentation, and solution of hardware/software problems as
well as other improvements that could be made to supplied equipment. The service shall begin at
the time of contract award, and shall continue for a minimum period of 15 years from operational
acceptance by the employer designed life of the equipment or 7 years after the declaration of
withdrawal of equipment from production whichever is earlier. The Contractor shall also include a
subscription to the hardware subcontractors' change notification service from the time of contract
award through the warranty period, with a Employer renewable option for extended periods.

6.1.3 Mandatory Spare Parts

The Contractor shall be required to supply minimum spares for each subsystem as in BPS. The subsystem set
of spare parts is defined to include all equipment modules, subunits and parts required to effect replacement,
repair and restoration to full operational status of a defined unit of a subsystem (i.e. SDH equipment.).

6.1.4 Warranty Period

The one year period commencing immediately after the operational acceptance is called the
Warranty Period/Defect liability Period. In addition to the responsibilities covered under Vol-I
Condition of Contracts during Defect Liability Period, the Contractor shall also be responsible for
maintenance of the Fibre Optic Transmission System etc. supplied under this Package.

6.1.5 Miscellaneous Supplies

The Contractor shall provide all required consumable and non-consumable supplies necessary to
support all installation and test activities through final operational acceptance. However, if there are
any problems in the SAT and additional consumables are required, the same shall also be supplied
by the Contractor at no additional cost.

7 Documentation

The Contractor shall submit following documents during detailed engineering:

(a) Data Requirement sheets

(b) Link Budget calculations
(c) MQP, FQP
(d) Bill of Quantity including mandatory spares
(e) Previous Type test reports
(f) Factory Test report
(g) Manuals for each equipment
(h) Schematic drawing
(i) Numbering, Marking, labelling document
(j) Synchronization plan
(k) Test schedule
(l) Training manual
(m) Configuration diagram
(n) Transportation & handling Procedure
(o) Installation Manuals
(p) Maintenance Manuals

Rev-02
 Annexure - I

Testing Requirement of Communication Equipment

1.1 List of type test to be conducted on Telecom equipment

The type tests for Telecom Equipment with all types of cards are described below:

1.1.1 Temperature and Humidity Tests

The tests listed below are defined in IEC Publication 60068.

(a) Low Temperature Test: Operation to Specifications

Low temperature tests shall be conducted as defined in IEC Publication 60068-2-1, test method Ad, with the following
specifications:

(1) Test Duration: The equipment is started up as soon as thermal equilibrium has been reached and
operated for sixteen (16) hours. Its performance is checked during the test.
(2) Degree of Severity: Test shall be done at 0°C
(3) Acceptance Criteria: No degradation of performance during and after the test.

(b) Low Temperature Test : Operation without Damage

Low temperature tests shall be conducted as defined in IEC Publication 60068-2-1, test method Ad, with the following
specifications:

Rev-02
 (1) Test Duration: The equipment is started up as soon as thermal equilibrium has been reached and
operated for 72 hours. Its performance is checked during the test and after the test as soon as the
thermal equilibrium is reached at the room temperature (Post-test).
(2) Degree of Severity: Test shall be done at -10° C
(3) Acceptance Criteria: Degradation of performance is allowable during the test, however there shall be
no degradation of performance in the post-test.

(c) Dry Heat Test: Operation to Specifications

Dry heat test shall be done as defined in IEC Publication 60068-2-2, test method Bd, with the following specifications:
(1) Test Duration: The equipment is started up as soon as thermal equilibrium has been reached and operated for
96 hours. Its performance is checked during the test.
(2) Degree of Severity: operation to specification range.
(3) Acceptance Criteria: No degradation of performance during and after the test.

(d) Dry Heat Test: Operation without Damage

Dry heat tests shall be done as defined in IEC Publication 60068-2-2, test method Bd, with the following
specifications:

(1) Test Duration: The equipment is started up as soon as thermal equilibrium has been reached and
operated for 96 hours. Its performance is checked during the test and after the test as soon as the
thermal equilibrium is reached at the room temperature (Post-test).
(2) Degree of Severity: Test shall be done at 55ºC.
(3) Acceptance Criteria: Degradation of performance is allowable during the test, however there shall be
no degradation of performance in the post-test.

(e) Damp Heat Test

Damp heat testing reveals aging with respect to the humidity level and applies basically to electronic equipment. This
test shall be done as defined in IEC Publication 60068-2-3 with the following specifications:

(1) Test Duration: The equipment is started up as soon as thermal equilibrium has been reached and
operated for 10 days. Its performance is checked during the test.
(2) Degree of Severity: Test shall be done at (40 ± 2) °C & (93 ± 3) % RH

(3) Acceptance Criteria: The equipment shall meet the specified requirement and there shall not be any
degradation in BER.

(f) Temperature Variation Test

Temperature variation testing shall be as per IEC Publication 60068-2-14 (Gradual Variations, Method Nb). The
equipment shall be powered on and various parameters shall be monitored continuously during the test period.

(1) Number of cycles required is five (5)

(2) The degree of severity: temperature TL:0°C, TH: (Operation to specification range)
(3) Cycle duration for each temperature is three (3) hours.
(4) Ramp : 1 oC/minute.
(5) Acceptance Criteria: The equipment shall meet the specified requirement and there shall not be any
degradation in BER.
Rev-02
1.1.2 Power Supply and EMI/EMC tests
The test procedure and acceptance criteria shall be as defined in IEC 60870-2-1.

(a) Immunity Tests

The list of Immunity tests are specified below in Table 1:

Table 1: Recommended Immunity Tests
S. Immunity Test AC DC Control Telecom Para-
No. Power Power & Signal Line metres
Supply Supply
1 Voltage Fluctuations Yes Yes N/A N/A
Table 11 of IEC 60870-2-1:
2 Voltage dips and 1995 - Level : 1
Yes Yes N/A N/A
Interruptions
3 1.2/50 - 8/20 μs Table 12 of IEC 60870-2-1:
Yes Yes Yes N/A 1995 - Level : 1
surges
Table 12 of IEC 60870-2-1:
4 Fast transient bursts
Yes Yes Yes Yes 1995 - Level : 4
5 Damped oscillatory Table 12 of IEC 60870-2-1:
waves Yes Yes Yes Yes 1995 - Level : 1

6 Electrostatic Table 13 of IEC 60870-2-1:

Yes
discharge 1995 - Level : 4
7 Radiated Table 15 of IEC 60870-2-1:
electromagnetic field Yes 1995 - Level : 4

-End of Table-

(b) Emission Tests

The list of Emission tests are specified below in Table 2

Table 2:
Recommended Emission Tests
S. NO. Emission test AC DC Control Telecom Para-
Power Power & Line metres
Supply Supply Signal
Table 17 of IEC
60870-2-1: 1995 -
1 RF disturbance voltages Class : B
Yes Yes N/A N/A
CISPR 22

2 RF disturbance currents
N/A N/A N/A Yes
CISPR 22
3 RF radiated fields
CISPR 22 Yes
-End Of Table-

Rev-02
(c) Insulation Withstand Voltages

As per section 6 of IEC 870-2-1. Recommended class: VW1 of Table 18.

1.1.3 Mechanical Tests

(a) Mechanical Vibration Test

The procedure for this test is described in IEC Publication 60068-2-6. The testing procedure shall be carried out in the
sequence 8.1 + 8.2.1 + 8.1 as described in document 60068-2-6. For the vibration response investigation (clause 8.1 of
60068-2-6), the test shall be carried out over a sweep cycle under the same conditions as for the endurance test
(described later), but the vibration amplitude and the sweep rate may be decreased below these conditions so that the
determination of the response characteristics can be obtained.

The endurance tests conditions are selected according to the vibration withstand requirements.

Transportation tests shall be performed with the equipment packed according to the Contractor's specifications.

(b) Shock Test

The procedure of this test is defined in IEC Publication 60068-2-27 (each test) with a semi-sinusoidal shape (clause
3.1.1.2).

The recommended severity shall be A = 294 m/s2, D = 18 ms. Three shocks per axis per direction shall be applied to
the equipment packed according to the Contractor's specifications.

Or Free Fall Test

This test could be performed as an alternative to the shock or Bump test. The procedure is defined in IEC publication
60068-2-32. The equipment shall be packed according to the Contractor's specifications. The drop height shall be
defined in accordance with IEC 68-2-32. The surface of the packing case which comes into contact with the ground is
the surface on which the packing case normally rests; if the packing does not have any features (inscription, special
shape, etc.) identifying this surface, the test is carried out successively on all the surfaces of the packing.

Or Bump Test

This test could be performed as an alternative to Shock test or Free Fall test. The procedure is defined in IEC 60068-2-
29.

1.2 Type tests for Optical Fibres

The type tests listed below in Table 3 shall be conducted on DWSM fibres to be supplied as part of Approach cable.
The tests specific to the cable type are listed in subsequent sections.

Table 3
Type Tests For Optical Fibres

S. No. Test Name Acceptance Criteria Test procedure

1 Attenuation As per Standard IEC 60793-1-40

Rev-02
 Table 3
Type Tests For Optical Fibres

S. No. Test Name Acceptance Criteria Test procedure

Or EIA/TIA 455-78A
2 Attenuation Variation with As per Standard IEC 60793-1-40
Wavelength Or EIA/TIA 455-78A
3 Attenuation at Water Peak IEC 60793-1-40
Or EIA/TIA 455-78A
4 Temp. Cycling As per Standard IEC 60793-1-52
(Temp dependence of Or EIA/TIA 455-3A, 2
Attenuation) cycles
5 Attenuation With Bending IEC 60793-1-47
(Bend Performance) Or EIA/TIA 455-62A
6 Mode Field dia. IEC 60793-1-45 Or
EIA/TIA 455-
164A/167A/174
7 Chromatic Dispersion IEC 60793-1-42 Or
EIA/TIA 455-
168A/169A/175A
8 Cladding Diameter IEC 60793-1-20 Or
EIA/TIA 455-176
9 Point Discontinuities of IEC 60793-1-40 Or
attenuation EIA/TIA 455-59
10 Core -Clad concentricity IEC 60793-1-20 Or
error EIA/TIA 455-176
11 Fibre Tensile Proof Testing IEC 60793-1-30
Or EIA/TIA 455-31B
-End Of table-

1.3 Type tests for Fibre Optic Approach Cable

The type tests to be conducted on the Fibre Optic Approach cable are listed in Table 4: Type Tests for Fibre Optic
Approach Cable. Unless specified otherwise in the technical specifications or the referenced standards, the optical
attenuation of the specimen, measured during or after the test as applicable, shall not increase by more than 0.05
dB/Km.

Table 4:
Type Tests Fibre Optic Approach Cable
S.NO. Test Name Test Procedure
1 Water Ingress Test (IEC 60794-1-F5 /
EIA 455-82B) Test duration : 24 hours
2 Seepage of filling compound (EIA 455-81A)
Preconditioning : 72 hours,
Test duration : 24 hours.

Rev-02
 Table 4:
Type Tests Fibre Optic Approach Cable
S.NO. Test Name Test Procedure
3 Crush Test (IEC 60794-1-E3/ EIA 455-41)
4 Impact Test (IEC-60794-1-E4/ EIA 455-25A)

5 Stress strain Test (EIA 455-33A)

6 Cable Cut-off wavelength Test (EIA 455-170)
7 Temperature Cycling Test (IEC60794-1-F1/EIA-455-3A) – 2 cycles
-End Of Table-

1.4 Factory Acceptance Test Requirement

Table 5:
Factory Acceptance Testing for Fibre Optic Transmission System
Item: Description:
1. Physical inspection for conformance to DRS, BOQ, drawings and appearance of equipment
2. Optical output power
3. Transmitter lightwave spectral analysis
4. Low receive level threshold
5. Generation of bit error rate curve
6. Measurement of analog and digital service channel parameters as well as service channel
functionality
7. Performance of supervision, alarm, Craftsperson interface, diagnostics, loop backs etc.
8. Electrical interface tests which include: output and input jitter, bit error rate, pulse shape,
cable compensation, and line rate tolerance for multiplexers
9. At a minimum tests on Ethernet interface shall include demonstration of ping test,
throughput test, Latency test, Packet Loss test as per RFC 2544
11. Simulation of failure conditions and failover of each redundant unit.
12. VLAN (Layer-2 switching) feature testing configuration.
13. Protection scheme for Ethernet Traffic (ERPS)
14. Test of spare card slots
15. Checks of power supply/converter voltage margins
16. Random inspections to verify the accuracy of documentation
17. Test of spare parts/modules/cards as per applicable tests

Table 6
Rev-02
 FAT on NMS (Craft Terminal)

1 Physical inspection of NMS hardware (Craft Terminal) for conformance to approved BoQ,
DRS & drawing
2 Testing of NMS to demonstrate proper operation of all functions: Configuration Management,
Performance Management, Fault Management and Security Management.

Table 7
Factory Acceptance Tests On Approach Cable
Factory Acceptance Test
Attenuation Co-efficient at 1310 nm and 1550 nm
Point discontinuities of attenuation
Visual Material verification and dimensional checks as per approved DRS/Drawings

1.5 Site Acceptance Tests

All equipment shall be tested on site under the conditions in which it will normally operate.

The tests shall be exhaustive and shall demonstrate that the overall performance of the contract works satisfies every
requirement specified. At a minimum Site Acceptance Testing requirement for Telecom equipment, NMS etc. is
outlined in following section. This testing shall be supplemented by the Contractor's standard installation testing
program, which shall be in accordance with his quality plan(s) for Telecom equipment installation.

During the course of installation, the Employer shall have full access for inspection and verification of the progress of
the work and for checking workmanship and accuracy, as may be required. On completion of the work prior to
commissioning, all equipment shall be tested to the satisfaction of the Employer to demonstrate that it is entirely
suitable for commercial operation.

1.5.1 Phases for Site Acceptance Testing

The SAT shall be completed in following phases:

1.5.1.1 Installation Testing

The field installation test shall be performed for all equipment at each location. If any equipment has been damaged or
for any reason does not comply with this Specification, the Contractor shall provide and install replacement parts at its
own cost and expense.

In the installation test report, the Contractor shall include a list of all hardware or components replaced or changed
Table 8
Factory Acceptance Test
Visual check of Quantities and Specific Component Number for each component of FODP and
dimensional checks against the approved drawings.

between the completion of factory tests and the start of field tests and show that documentation and spare parts have
been updated.

Rev-02
The minimal installation testing requirements for fiber optic transmission subsystem are provided in the table below:
Table 9
Fibre Optic Transmission system Installation Testing
Item: Description:
1. Physical Inspection for conformance to drawings, rack elevations and appearance of equipment
and cabling
2. Equipment power supply (DC-DC converter) output voltage measurements
3. Terminal transceiver performance testing (Tx power, Tx spectrum, receive signal strength,
connector losses etc.)
4. Service channel performance
5. Craftsperson interface, alarm and control functional performance
6. Rack and local alarms: No alarms shall be present and all alarms shall be demonstrated to be
functional
7. Network management interface and supervision performance
8. Correct configuration, level setting & adjustments and termination of Input/ output interfaces
9. Proper establishment of Safety and signalling earthing system and resistance to ground to be
checked.
10. Simulation of failure conditions and failover of protected components.

1.5.1.2 Link Commissioning Tests

The commissioning tests shall verify that communication can be performed over the fiber optic link under test. Delay
measurement, Bit Error measurements & service channel performance monitoring shall be made on the fibre optic
links to verify compliance with designed link performance.

For Ethernet interface: At a minimum the following test requirements shall be demonstrated
as per RFC 2544:
a) Ping test
b) Throughput test
c) Latency test
d) Packet Loss

The links shall be tested for 12 Hour. In case any link does not meet the performance requirements during 12 hour,
then the cause of failure shall be investigated and the test shall be repeated after rectifying the defects.

This phase of testing shall be conducted by the Contractor and witnessed by the Employer. Field adjustments shall be
made to meet established standard, however if the field adjustments fail to correct the defects the equipments may be
returned to the Contractor for replacement at his own expense. In case any adjustments are required to be made during
the interval of the test then the test shall be repeated.

1.5.1.3 Integrated Testing

Prior to commencement of integrated testing the overall system shall be configured as required to provide all the data
and voice channel required to interconnect to control centres and other nodes in existing system. The integrated testing
shall include end-to-end testing of communication.. The intent of integrated testing is to demonstrate that the
equipment is operational end to end under actual conditions, that all variances identified during factory and field
installation and communications testing have been corrected, and that the communication equipment is compatible
Rev-02
with other equipment. The Integrated System Test shall include all fibre optic transmission equipment, the network
management subsystem (Craft Terminal) and other components.

At a minimum the following tests shall be included in the integrated testing:

(1) Equipment configuration shall be checked to establish that it supports the channel routing.
(2) End to end testing of all individual voice circuits (VOIP) and to demonstrate proper operation of channels
over wideband systems. Operation shall be checked in terms of quality of voice, call initiation and call
termination processes.
(3) End-to-end testing of all individual Data Circuits (Ethernet). Operation shall be checked in terms of
monitoring of BER/packet loss.
(4) Testing of NMS (Craft Terminal) to demonstrate proper operation of all functions. All the standard features of
the NMS (Craft Terminal) shall be demonstrated for proper functioning.
(5) All the standard features of the existing NMS server (at RLDC/ SLDC) shall be demonstrated for proper
functioning with respect to supplied communication equipment/ Node.
(6) Demonstration of Protection switching and synchronization of equipment.

Annexure-II

Section: Repeater Shelter

1 Introduction
This section describes the functional requirement, major technical parameters and all the testing
requirements for telecom shelter system, including its sub-systems, Air-conditioning system, DG Set, PIU &
48V DC Power Supply.

1.1 Repeater Shelter Requirements

1.1.1 Shelter Dimensions

The minimum internal and external dimensions of the shelters shall be as per Table 2.1 as specified below:

Table 3.1 All dimensions are in mm

SNo. External/Internal Length (L) Width (W) Height (H)

Rev-02
 External 4500 2700 3160
1
Internal 4340 2540 3000

1.1.2 General
The shelters shall be protected and insulated to achieve sound proof, thermal resistance and impact
withstand capabilities. The shelters shall be 100% leak and water proof with IP 55 protection. The shelters
shall be maintenance free having minimum life of 15 years. These shelters shall be suitable for outdoor and
may be mounted at any location including ground and rooftop and in any climatic conditions. The shelters
shall be easily assembled and installed at site. The shelters shall be re-locatable as and when required.

1.1.3 Shelter Panels

The shelter shall be made of “sandwich insulated panels” 80 mm thick with Poly Urethane Foam (PUF) as
filler material between polyester pre-coated cold rolled aluminium sheets. The insulation characteristics of
PUF material shall conform to Clause no. 1.3.19 of these specifications.

For Steel shelters, the thickness of the inner-side and outer steel sheets except floor panel sheets shall be
minimum 0.8 mm and 0.6 mm respectively. For Aluminium shelters, the thickness of both inner side and
outer side aluminium sheets except floor panel sheets shall be minimum 0.91 mm. The outer bottom sheet
shall be hot dip galvanised steel sheets and aluminium sheets of minimum 1.0 mm and 1.2 mm thickness
respectively to avoid rusting of the bottom panel. The sandwich panels shall be manufactured by high
pressure injection technique. The panels to be provided with tubular element precast in panels while foaming
to form an integral part through this precast element GI steel rods of required sizes shall be inserted and
fastened to top and bottom structures. The steel and aluminium sheets of standard and reputed make shall
only be used.

1.1.4 Floor
The floor shall consist of standard PUF sandwich panels suitably reinforced to support the minimum load
capacity of 2000 kg/m2 and having at least 19 mm Marine plywood covered with anti static PVC flooring. In
case of floor panel, 19 mm Marine plywood shall be provided on top of the panel and no steel or aluminium
sheet shall be provided inside the panel. The anti static flooring shall be provided with pacific blue anti static
vinyl robust rolls of at least 2 mm thickness. The floor shall be even surfaced, scratch proof having long life.
The installation of various proposed equipment shall be possible either by direct placement on the floor or
by grouting to the floor or through C rails. The Contractor shall submit the reinforcement and other details
calculations in support of the meeting the load capacity.

1.1.5 Roof
Roofs shall be made of the panels same as specified for walls. A secondary slanting roof of suitable material
shall be provided to protect the primary roof from direct sunlight and rainwater. A minimum down slant of
1:50 shall be maintained from front to back. The secondary roof shall have minimum projections and shall
be hidden by angular profiles on the rooftop to decrease the aerodynamic effect and improve on aesthetics.
The secondary roof shall be suitably clamped/ bolted to the shelter panels to withstand the specified wind
load. The details of the secondary roof and its attachment arrangement shall be submitted for Employer’s
approval during detail engineering. The cable tray shall be attached suitably from the roof and the roof shall
have sufficient strength to support the load of cable trays and the cables installed on the cable tray.

1.1.6 Door

Rev-02
The Shelters shall have one door for main entrance. The door dimensions shall be 1000 mm (W) X 2200 mm
(H). Main door opening outwards shall be provided with external and internal handles/knobs respectively. A
reputed make lock shall be provided in door handle. The make of the lock shall be got approved during
detail engineering. The door can be opened from inside when locked. Door, when locked cannot be removed
even if the hinges are removed. The door shall generally be hinged at right, however, other option may be
also required at some sites to meet the actual site condition. The door shall have aluminium biddings
extrusions in door/jamb profile, replaceable and suitable neoprene rubber gaskets around its border for
proper weather proofing. The door shall also be equipped with a hydraulic auto closure and the door latch /
stopper shall be provided to keep the door in open position. The door shall have a limit switch to indicate
intrusion and switch on one light provided inside the shelter. A canopy of minimum size 1200 mm X 500
mm shall also be fixed up above the external light / door for protection from direct sun/rain. The canopy
shall suitable slope and shall be covered from both sides.

1.1.7 Jointing
All panel to panel connections shall be made with eccentric cam locks or suitable locking system. The wall
to floor and wall to roof jointing shall be made with angular frames of suitable size. The panel to panel
jointing at the corners shall either be suitably angular frames of suitable size or a single corner panel may be
provided. All internal corners shall be jointed suitable angles. All the joints shall be suitable sealed with PU
or silicon sealant to provide 100 % leakage and water proofing. The Contractor shall submit the drawing
indicating details of all joints in support of meeting the specified requirement.

1.1.8 Opening

The shelter shall have provision for openings for required air-conditioners, piping and all electrical and
optical cablings on the wall panels. The details of openings required for different applications and the
locations of the openings shall be decided during detail engineering. All openings shall be custom built
based upon the actual application required at each site. The Contractor shall provide the required cut outs for
above purpose. Any sealed cut outs required for future use may also be provided and the size of this cut out
shall be finalised during detail engineering. All the openings shall be sealed for water and leak proof with
suitable flexible sealing arrangement for the proposed cable connections and also for addition and deletion
of cables/pipes in future. The sealing arrangement shall be fire retardant and type/make/details shall be got
approved by the Employer.

1.1.9 Insulation

The PUF to be used for insulation of the panels shall be CFC free and conforming to latest IS 12436
standards or equivalent International standard. The other parameters shall be as per Table 3.2 as given
below:

Table : 3.2
SNo. Items Required Parameter
1 Thickness 78.6 mm
2 Density 40 kg/m3
3 Compressive Strength 1.2 kg/cm2
4 Tensile Strength 3.6 kg/m2
5 Bending Strength 4.0 kg/m2
6 Adhesion Strength 2.9 kg/m2
7 Dimensional Stability At (-) 25 oC : 0.1%, at 38 oC : 0.1% and at 100 oC :
0.4%
8 Temperature Range (-)15 oC to 95 oC
9 Thermal Conductivity 0.02 kcal/hr/m/oC
Rev-02
 Table : 3.2
SNo. Items Required Parameter
10 Fire Resistance As per BS-4735 horizontal burn < 125 mm
11 Water Absorption 0.2 % @100% RH
12 Vapour Permeability 0.08/0.12 g/hr/m2
13 Self Extinguishing Yes
14 Biodegradable Yes

The Contractor shall submit the earlier carried out type tests reports for PUF material. In case the contractor
does not submit the reports or the submitted reports are not meeting the requirements, the contractor shall
carry out the type tests on PUF material for the following:
Thickness, Density, Compressive strength, Tensile Strength, Dimensional Stability, Thermal Conductivity
and Fire resistance.

1.1.10 Heat Transmission Coefficient

The installed shelter with one door shall have the heat transmission coefficient K ≤ 0.3.

1.1.11 Colour

The colour shall be stabilised grey on all external sides and off white on all internal sides. The colour of the
slanting roof shall also be stabilised grey. However, the actual colouring scheme shall be finalised during
detail engineering.

1.1.12 Fire and Smoke Detection System

Suitable fire & smoke detection system shall be provided in each of the shelters. The offered fire & smoke
detection system shall work on DC supply (-48V) being provided by the Contractor under this contract. In
case, the smoke detector and fire alarm system requires other voltage than the above stipulated voltage (-
48V DC) for operations, suitable converter & hardware shall also be provided by the Contractor. The
Contractor shall provide all required cabling & accessories for full functioning of the offered system with
both power supplies. At least two ionisation type smoke detectors along with fire detection panel shall be
provided below the roof panel in strategic locations inside the shelter. The alarm should activate only if both
fire detectors are actuated to avoid any false alarm. The details, locations and its various logistics shall be
finalised during detail engineering. The operation/activation of the fire detector shall result in the following:

a. An external visual signal and audible alarm sounded outside the shelter.
b. A signal to be given to the telecom equipment panel through potential free dry contact as a local alarm
for its remote monitoring in the control centre.
c. Suitable pilferage proof enclosure for visual and audio alarm outside the shelter.

All the detectors installed shall be tested for actuation and its required operations during SAT. The exact
method of the testing shall be detailed in SAT procedures.

1.1.13 Lighting system

Normal and emergency lighting shall be provided inside the shelters. The normal lights shall consist of two
nos. (36 Watts) of reputed make fluorescent lights along with requisite fittings and shall be powered with ac
supply from ACDB. Two nos. emergency light with requisite fittings shall also be provided which shall be
powered with dc supply available (-48 V DC) for telecom equipment from DCDB. In the event, the
emergency lighting system requires other voltage than the above stipulated voltage for operations; suitable

Rev-02
converter & hardware shall be provided by the Contractor. The outside light shall be bulk head type,
powered with ac power supply from ACDB, provided at top of the door and covered with the door canopy.
The bulk head type shall be provided with metallic guard to prevent pilferage. The switch of both internal
and external lights shall be inside the shelter but adjacent to the entrance for easy accessibility. Additionally,
at least one of the normal lights inside the shelter shall be lit up with the opening of the shelter door. One 5
A / 15 A duplex socket with switch shall also be provided in addition to the requisite switches for the normal
and emergency lights.

1.1.14 Cable Tray

The cable tray of size minimum 300 mm width made of Fibreglass Reinforced Polymer (FRP) material shall
be provided inside/outside the shelter for supporting various cables and shall be attached to the roof top/wall
panels. The alternate material for the cable tray, if required shall be with specific approval of the Employer.
The cable trays shall have sufficient strength to take loading of various cables like fibre optic cables, various
power, signal & control cables, earthing flats etc. The rungs along the cable ladder shall be separated by not
more than 300 mm. The colour of the cable tray shall match with the inside colour of the shelter. The
Contractor shall submit the cable tray details for Employer’s approval. The cable tray shall run along the
four sides just below the ceiling with smooth curvatures at the bends/corners. The actual routing including
length and height of the cable tray for each site shall be finalised during detail engineering. The Contractor
shall clamp the cables suitably with the trays after installation of the cables.

1.1.15 C – Rails
C-rails made of extruded aluminium alloy of suitable size along with required number of lock-nuts shall be
provided inside and outside the shelter to support various items like lighting, AC Distribution Box (ACDB),
DC Distribution Box (DCDB), Fire detector along with the panel, cables and all other accessories. The C-
rails may also be used for supporting cable trays from the roof, mounting of equipment on the floor and on
the wall. The requirement of C-rails shall be finalised during detail engineering.

1.1.16 Energy Meter Box

An IP 55 compliant weatherproof box shall be provided for housing the energy meter along with MCBs and
fuse units. The energy meter box shall have two different doors and compartments, one for
accessing/housing energy meter and another for accessing/housing MCBs and fuses. The energy meter box
shall have glass for view of meter reading from outside. The energy meter box shall be of Fibreglass
Reinforced Polymer (FRP) material. The alternate material, if required, shall be with specific approval of the
Employer. The box shall be provided with pad lock arrangement and shall be installed on external shelter
panels with suitable fittings. Proper sealing shall also be done to avoid any water leakage into the panel. The
size and locations of meter installation shall be finalised during detail engineering.

1.1.17 Loading Capacity

Minimum roof loading capacity: 250 kg/m2

Minimum floor load capacity: 2000 kg/m2
Minimum wall load capacity: 300 kg/m2

The above load capacities have been identified as minimum requirement. However, during detail
engineering, to meet the actual load requirement for cable tray, ACDB, DCDB, C-rails, Air-conditioning
system, battery, batteries chargers, telecom equipment, lighting etc. to be supplied and installed inside the
shelter, the actual localised loading requirement may be higher and the supplied shelter loading capacity
shall meet the actual localised loading requirement at no additional cost to POWERGRID.

Rev-02
1.1.18 Structural Stability

 Resistant to various volumes of rain, dust & sand impinging from various directions over different
durations and different speeds.
 Resistant to corrosion against water, industrial air and saline air.
 Resistant to decomposing vegetation, rodents, termites and micro-organisms.

1.1.19 Survival wind speed

The shelter shall be designed to withstand a wind load of 200 kmph.

1.1.20 Cables and Cabling

All cables and cabling of required size and capacity shall be supplied, installed and terminated with
necessary and required accessories among all the equipment/systems being supplied under this Package. The
cables from cable ladder to equipment cable entry height shall be installed in the wall of the shelter in PVC
cable conduits and in flexible conduits from shelter wall to equipment. The cables shall be dressed properly
and suitably attached with the shelter panel. No hanging cables shall be allowed.

1.1.21 Structural
All structural steel shall conform to latest IS: 2062 or equivalent International standard. The ISMBs shall
conform to IS – 808 or equivalent International standard. The structural MS pipes shall conform to IS:1161
or equivalent International standard. The steel work shall be galvanised after full fabrication as per latest IS
standards and the coating thickness shall be greater than 127 micron. All welding shall be as per IS – 816 or
equivalent International standard. All nuts and bolts shall be galvanised and conform to IS : 6639 or
equivalent International standard. All fittings and hardware used in the shelters shall be made of corrosion-
resistant aluminium or galvanised steel as specified in the relevant clauses of this specification.

The requirement of steel/aluminium sections shall also be provided and no separate payment shall be made
in this regard.

1.1.22 Earthing
For satisfactory operation of the equipment inside the shelter, good and proper earthing is required at each
site. The earthing resistance generally varies depending on soil resistivity. The earthing system at each site
shall be provided by the Contractor with earthing resistance not exceeding the five (5) ohms. The
Contractor shall provide the pipe type earthing along with the necessary hardware and accessories required.
Minimum two earth pits shall be made at each location. However, if required resistivity is not met, then,
sufficient nos. of pipe type earthing shall be provided by the Contractor. The Contractor shall submit the
earthing pit diagram for Employer’s approval.

An earthing ring of copper strip of minimum size 25mmX3mm shall be made inside the shelter. Each
equipment shall be connected to above earthing ring through 70sqmm copper cable. The connectivity from
earthing pit to the shelter earthing ring shall be made by the Contractor through two (2) nos. of 50 X 6 mm
GI strips. The connection of GI strips with the copper strips shall be made through flexible copper cable and
bi-metal washers for proper connectivity. The GI strips for earthing pit to shelter shall be buried inside the
ground.

Three days after completion of the earthing pit, the earth resistance shall be measured in the presence of
Employer’s representative and test results for each location shall be submitted for Employer’s approval.
All the equipment shall be connected properly to this earthing system for their safe operation.
Rev-02
1.1.23 Foundation System for Shelter
The Contractor shall design and construct complete foundation system for all finalised shelter locations
depending on the type of soil, including supply and furnishing all the material & labour, tools & tackles,
plant and machineries etc. as required for successful completion of the job. The foundation system shall also
include the following:
 Site preparation
 Soil characteristics assessment as required for foundation design for each site including detail soil
investigation, if required.
 Water level assessment
 Raising of site level above maximum flood limit level to avoid any water logging in the shelter area.
 Concrete pedestals (in situ) along with base slab for the foundations located on ground and concrete
pedestals for roof top locations along with supply and fixing of necessary holding down / anchor
bolts.
 PCC and finish of surface below and around shelter location with suitable slope.
 Installation of base frame and sub-frames on the pedestals through ISMB channels.
 Stair access for shelter.

1.1.24 Site Preparation at Shelter locations

For each of the shelter to be installed on the ground, the Contractor shall execute the work for site
preparation, such as clearing of the site, levelling of the site, the supply and compaction of fill material (if
required), excavation and compaction of backfill for foundation, trenches etc with available excavated earth.
At certain locations, the finished ground level (FGL) site shall be fixed above High flood level (HFL) to
avoid water logging in the shelter area. The site shall be prepared to meet the specified requirement for each
site and up to satisfaction of the Employer. If fill material is required for site preparation, the fill material
shall be provided with suitable protection so as to prevent the erosion by wind and water from its final
compacted position or the in-situ position of undisturbed soil. Quantities of Earth filling with suitable
protection have been identified in BoQ for above purpose.

Backfill material around foundation and shelter shall be suitable for the purpose for which it is used and
compacted to the satisfaction of the Employer. Excavated material not suitable for use or not required for
backfill shall be disposed off in area as directed by the Employer, including all leads and lifts.

Whenever water table is met during the excavation, it shall be dewatered and water table shall be maintained
below the bottom of the excavation level during excavation, concreting and backfilling.

For roof top shelters, the Contractor shall also prepare the site suitably for shelter installation on the
pedestals. In all cases, each site shall be fully prepared before start of foundation activities up to satisfaction
of the Employer.

1.1.25 Concrete Pedestals and Foundation system

Two types of foundations are envisaged for shelters viz. (i) required for shelters to be installed on ground &
(ii) required for shelters to be installed on roof top of a building.

The foundation of shelters to be installed on the ground shall consist of RCC pedestals of minimum 600 mm
above levelled ground. The depth of pedestals below the ground shall be minimum 1500 mm including
bottom slab. The size of bottom RCC slab of the foundation shall be minimum 600 mm X 600 mm for a
minimum 250 mm depth. The reinforcement shall be as stipulated at clause 2.4.4 below. The PCC (1:4:8) of
minimum depth 75 mm shall be provided below the bottom slab of minimum size 750 mm X 750 mm. The
size of the pedestals shall be minimum 300 mm X 300 mm. The grade of concrete shall be M20 (1:1.5:3).
The concrete cover for the reinforcement shall be minimum 50 mm.

Rev-02
The foundation of shelters to be installed on the roof top shall consists of RCC pedestals of size minimum
300 mm X 300 mm and 300 mm above roof surface of M20 (1:1.5:3) grade. The bottom of the pedestal shall
be connected and attached with the existing roof structure/slab. The reinforcement shall be as stipulated at
clause 2.4.4 below.

The exposed portion of the concrete pedestals shall be plastered with 1:4 cement plaster for smooth finish.

The above pedestal dimensions are minimum requirement and the Contractor shall provide the required size
of pedestals depending upon the soil bearing capacity and other soil parameters of each site to support the
installed shelter along with all equipment. The detailed design for all above type of foundations shall be
submitted to the Employer and got it approved before commencement of work at site.

The shelter shall be fixed to the pedestals through ISMBs 200 mm minimum and sufficient number of sub-
frames with suitable anchor bolts. The required ISMBs and sub-frames shall be provided by the Contractor
as part of shelter/foundations. The required number of pedestals shall be provided for shelter installations,
however, minimum one pedestal is to be provided at each corner of the shelter. The Contractor shall provide
the required and necessary foundation system at each site irrespective of soil to meet the requirement and
submit the civil/structural/foundation design and drawings along with the load calculation for Employer’s
approval. All required foundation system and related works shall be in Contractor’s scope and no additional
payment shall be paid to the Contractor irrespective of soil characteristics and site conditions.

The suitable staircase shall be provided at each shelter location in front of the door for easy entry into the
shelter as a part of foundation/pedestal system and no separate payment shall be made in this regard.

1.1.26 Concreting
After completion of foundation work at each shelter location, PCC (1:2:4) of depth minimum 100 mm shall
be provided below the shelter position and outer sides for shelter as decided during detail engineering /
execution. There shall be adequate slope in the Shelter area PCC to avoid water logging.

The Contractor shall also provide the RCC platform of about 600 mm height for installation of DG set. The
exact area and the height of RCC required for DG set and shelter area shall be finalised during detailed
engineering. At few locations, PCC platform for DG set may be provided. Quantities of PCC have been
identified in BoQ for above.

1.1.27 Properties of Concrete

The cement concrete used for foundation shall be of grade M-20 corresponding to 1:1.5:3 nominal mix ratio
with 20 mm coarse aggregate. All the properties of concrete regarding its strength under compression,
tension, shear, punching and bend etc. as well as workmanship will conform to latest IS standards or
equivalent International standard.

The Portland cement used in concrete shall conform to 33 grade (IS:269) or 43 grade (IS:8112) or 53 grade
(IS:12269) or equivalent International standards.

The Puzzolena cement used in concrete shall conform to IS : 1489 or equivalent International standard. The
curing time of Puzzolena cement shall be decided at the time of execution of the work under the contract
based on the certificate from a reputed laboratory which will be obtained and submitted by the Contractor.
Cement of only POWERGRID approved make shall be supplied.

Concrete aggregate shall conform to IS: 383 or equivalent International standard.

The water used for mixing concrete shall be fresh, clean and free from oil, acids and alkalies, organic
materials or other deleterious substances. Portable water is generally preferred.
Rev-02
Reinforcement shall conform to IS: 432 or equivalent International standard for MS bars up to 6 mm and
hard drawn steel wires and to IS : 1139 and IS : 1786 or equivalent International standard for deformed and
cold twisted bars 8 mm and above respectively. All reinforcement shall be clean and free from loose mill
scales, dust, loose rust and coats of paint, oil or other coatings, which may destroy or reduce bond.
Contractor shall supply, fabricate and place reinforcement to shapes and dimensions as indicated or as
required to carry out the intent of drawings and specifications. Reinforcement of only POWERGRID
approved makes shall be supplied.

1.1.28 Mixing, Placing and Compacting of Concrete

Mixing shall be continuous until there is uniform distribution of material and the mix is uniform in colour
and consistency. Normal mixing shall be done close to the foundation, but exceptionally the concrete may be
mixed at the nearest convenient place. The concrete shall be transported from the place of mixing to the
place of final deposit as rapidly as practicable by methods which shall prevent the segregation or loss of any
ingredient. The concrete shall be placed and compacted before setting commences.

Form boxes shall be used for casting all types of foundations and pedestals.

The concrete shall be laid down in 150 mm layers and consolidated well, so that the cement cream works, up
to the top and no honey-combing occurs in the concrete. Preferably, a mechanical vibrator shall be employed
for compacting of concrete. However, in case of difficult terrain, manual compaction may be permitted at
the discretion of the Employer. Monolithic casting of foundations must be carried out. After concreting the
pedestal portion to the required height, the top surface should be finished smooth.

Wet locations shall be kept completely dewatered, both during and 24 hours after placing the concrete,
without disturbance of the concrete.

If the concrete surface is found to be defective after the form work has been removed, the damage shall be
repaired with rich cement sand mortar to the satisfaction of the Employer before the foundation is back
filled.

1.1.29 Curing
The concrete shall be cured by maintaining the concrete wet for a period of at least 10 days after placing.
Once the concrete has set for 24 hours, the pit may be backfilled with selected moistened soil and well
consolidated in layers not exceeding 200 mm thickness and thereafter both the backfill earth and exposed
pedestal shall be kept wet for the remainder of the prescribed 10 days. The exposed concrete chimney shall
also be kept wet by wrapping empty cement bags around it and wetting the bags continuously during the
critical 10 days period.

1.1.30 Other associated civil works

The Contractor shall also carry out other minor civil works in the shelter area for the equipment/system
being supplied under the Contract at no additional cost to the Employer.

1.1.31 Installation
The shelter shall be installed on the foundation system as specified above and to meet the actual requirement
as per actual site/soil conditions. The installation of shelters shall be carried out in such a way that it shall
meet all specified requirement. The installed shelters shall be suitable for both transporting in assembled
condition to another location and dismantling, transporting to another site and reassembling there.

The Contractor shall make their own arrangement for AC supply / DG set during installation/testing of the
system.
Rev-02
1.1.32 Finish
The final finish of the installed shelter system shall show good workmanship. The panels and floor shall be
totally scratchproof. The floor shall not have any uneven surface. The total shelter shall be air tight, the roof
and all joints shall be leak and water proof and the door shall be easily lockable & unlockable.

1.1.33 Wire Mesh Fencing System for Outside Protection

To protect the shelters along with the installed equipment, air-conditioners, DG sets etc. from vandalism,
wire mesh fencing shall be constructed at each of the shelter locations installed at ground. The wire mess
size shall be of 75 mm, the nominal dia of the mess wires shall be 3.5mm and fencing shall be at least 2.0 m
height from ground level. The pipes/angles of adequate size and capacity shall be provided to support the
fencing. An iron gate of minimum size of 2 m or as per site requirement with pad locking facility shall also
be provided at each location to enter the protected area. The fencing system shall also be painted (one coat
of primer and 2 coats of final paint) for better reliability. The paint colour shall be finalised during detailed
engineering. The provisional quantities of wire mess fencing system including the gate in running meters
have been indicated in the BOQ and the actual quantity shall be finalised during detail engineering based
upon the actual site conditions. All associated civil works for the fencing shall also be carried out by the
Contractor. The Contractor shall submit the layout of the shelter and other equipment and the barbed wire
fencing for each of the locations for Employer’s approval.

1.1.34 External Alarms

The telecom equipment being provided under separate package shall have provision of taking input of
external alarms from various equipment e.g. DG set, air-conditioning system, DCPS, fire & smoke detection
system, PIU unit etc. The Contractor shall provide necessary dry contacts at all the equipment being
provided under this package and shall wire up these up to the telecom equipment. Contractor shall integrate
and extend the Potential Free Contacts minimum for the alarms indicated at Cl.6.3.5 of specification.

1.1.35 Testing of Shelter system along with all sub-systems

1.1.35.1 Type testing

The Contractor shall provide the earlier carried type test reports for the PUF material and other
sub systems of the shelter.

1.1.35.2 Factory Acceptance Testing (FAT)

The following tests shall be carried out during Factory Acceptance testing (FAT):

a. Dimensional and checks as per approved DRS/drawings

b. BOQ verification as per approved drawings/documents
c. Test certificates from the Original Equipment Manufacturer.
d. Density test, Compression test and Thermal Conductivity test on the PUF material.

FAT on other items shall be carried out as specified in this specifications and relevant standards.

1.1.35.3 Site Acceptance Testing (SAT)

The site acceptance testing shall be carried out for each site. The installed system shall be powered up and
all the equipment shall be tested and commissioned. The various installed system shall be tested for the
specified functional requirements and shall be as per approved drawings. The SAT shall be carried in an

Rev-02
integrated way and not individual equipment basis to demonstrate the integrated functioning of the installed
system. The tests shall be carried out on following minimum items during SAT:

i. Site preparedness, PCC and RCC.

ii. Civil Pedestals and Steel structure for Base of Shelter System
iii. Shelter (including water proof test)
iv. Air-Conditioning System
v. Cable Tray
vi. Lighting System
vii. Fire and Smoke Detector System
viii. C-Rails
ix. Earthing System
x. Wire Mess Fencing

The detailed SAT procedure shall be submitted for Employer’s approval.

1.1.36 Marking

The following information shall be provided outside the shelter and near the door engraved on a steel metal
plate:

a. POWERGRID logo and name.

b. Project Name
c. Shelter location name
d. Identification no.
e. Year of Manufacture
f. Shelter dimension

1.2 Requirements of Air Conditioning System

1.2.1 General
The air conditioning system shall be provided in the shelters to be used for housing Telecom equipment,
power interface unit, VRLA batteries, battery charger etc. throughout the country. Repeater Shelters are
placed for amplification of telecom signals in between the fibre optic links. The Contractor may note that
these shelters are generally located in unmanned areas; therefore, the air-conditioning system shall be
rugged, reliable, maintenance free and designed for long life.

1.2.2 Technical Experience

The Air Conditioners shall be offered from a manufacturer and Air Conditioners manufactured by such
manufacturer should have been in operation for at least one (1) year as on the originally scheduled date of
bid opening.

Bidder shall furnish the details/document in support of above Technical experience of manufacturer along
with bid.

1.2.3 Operational Requirements

The air-conditioning is required for critical applications i.e. for maintaining the temperature of the critical
telecom equipment inside the shelters on 24hours, 365 days of the year operation basis. Thus, to provide
redundancy for such critical applications, Contractor shall offer twin circuit air conditioning system
comprising of two air conditioning units packed in a single frame working in conjunction, controlled by the
single inbuilt Micro processor based controller for desired operation.
Rev-02
Depending upon the size and location of shelter, following type of air conditioning systems shall be
supplied:
i) 2X2TR capacity air conditioning system with free cooling unit
ii) 2X2TR capacity air conditioning system without free cooling unit
iii) 2X1.5TR capacity air conditioning system with free cooling unit
iv) 2X1.5TR capacity air conditioning system without free cooling unit

Both units shall be independent of each other. The units shall run one by one in pre settable time bound
cyclic ON/OFF mode. However, during running of AC unit 1, if the inside temperature of the shelter reaches
to a predefined value, the AC unit 2 shall also start running to maintain the inside temperature to specified
24 oC. After achieving this temperature, the other unit shall again shut off.

Problem/ fault in one of the unit shall not hamper the working of other unit and during such fault in any of
the unit; the alternate unit shall take over and continue to operate till the faulty unit is operational again.

Both units shall never start at the same time. If the condition is such that both units shall start together then
internal time delay of at least 10sec shall be provided in starting of each unit to avoid surge.

In free cooling mode, the refrigerant cycle of AC unit shall be switched off and outside air (after filtration)
shall be circulated inside the conditioned space through the operation of dampers provided with suitable
sensors. It should be possible to run the Free Cooling Unit (FCU) on both AC & -48V DC Power supplies.
This mode shall come into operation in the following conditions;

i. When the ambient temperature is below a preset value, which is to be decided during detailed
engineering.
ii. In case of failure of refrigeration system of both the units.

The failure of free-cooling feature shall not hamper the normal operation of Air Conditioning units.
1.2.4 Operational Life
The air conditioning system to be supplied shall have operational life of 10 years.

1.2.5 Design
The air-cooled self contained package AC system shall be designed as per following conditions:
 Rated Capacity : 1.5TR/2TR
 Type of Discharge : Free Flow.
 Air inlet Temp (Return Air) : 24 0C (DB) RH : 50
 Temperature Variation allowed :  1 0C
 Ambient Air Design Temp : 45 0C
(entering the Condenser)
 No. of Refrigeration Circuits : Two
 Type of load Factor : High sensible heat load (SHR>0.9)

1.2.6 Micro processor based Controller

The air conditioning system shall have a common microprocessor based controller for both AC units, packed
within the same cabinet. The microprocessor based controller shall have the following features;

Controller Common for AC1+AC2

Mode of Operation RUN/TEST/ Standby mode

Rev-02
Temperature Setting 16 -30 deg. C with 1 deg C resolution

Temperature variation from set temperature:  1 0C

Cycle Time, Duty Changeover 2, 4, 6, 8, 10, 12 hours.

Unit Changeover Both the AC units shall operate in pre-settable cyclic

mode. Also, if one unit is faulty the controller shall be able to detect &
put the other unit in operation automatically.

Running of both units: Start of IInd unit along with Ist unit in case sensor senses high
temperature.

Memory Non-volatile memory for various settings supported by

Battery backup eg. Set temp., working hours & ON /
OFF Status

Alarms Displays Potential Free contacts for Remote monitoring at NOC

a) AC unit1 fails alarm
b) AC unit2 fails alarm
c) High Temp inside shelter alarm
d) Power Fail alarm
e) Indication for free cooling
In addition to the above, following minimum LED Indications shall
also be available in the Controller Mimic Panel for local indication;
a) Alarm.
b) Power Healthy.
c) Blower Working.
d) Compressor Working.
Time Delay On / Off sequence delay shall be available.
Cumulative hours run For each compressor of Air-conditioning system
Free Cooling Operates the blower fans & changeover damper position to
circulate outside air.
Enthalpy/Temperature Sensor : As required along with free cooling.

Further, the free cooling function may be enabled/ disabled with help of the controller.

1.2.11 Earthing
The AC equipment shall be properly earthed by connecting it to the earthing system.

1.2.12 Power Supply

The offered air-conditionings equipment shall work satisfactorily for the power supply range as mentioned
at mentioned below:

Nominal Voltage: 230 V (Single phase)

Variations: ± 10%
System frequency: 50 Hz (±5%)

Supply and installation of all required cabling, wiring and termination and accessories including surge
arrestors, motor starters, circuit breakers and switches from the power supply point/ Meter point to the
various units via ACDB shall be carried out by the Contractor.

Rev-02
1.2.13 Testing

1.2.13.1 Type Testing

The type testing of the air-conditioning system shall conform to latest IS: 8148 standards or equivalent
International standard.

1.2.13.2 Factory Acceptance Testing

The factory acceptance testing shall be carried out as per latest IS: 8148 standards or equivalent International
standard.

1.2.13.3 Site Acceptance Testing (SAT)

The site acceptance testing for air-conditioning system shall be carried out by the Contractor after successful
installation of the air conditioning system. The SAT shall demonstrate all its functions properly. The
detailed SAT procedure shall be submitted by the Contractor for Employer’s approval.

1.3 Requirements for DG Set

1.3.1 General
The DG sets shall generally be installed on ground and the required RCC/PCC floor shall be provided by the
Contractor. Single Phase DG sets of rated capacity without AMF panel are required. AMF panel shall be the
part of Power Interface Unit (PIU). Most of these DG sets shall be installed at unmanned sites located in
rural/remote villages/towns. The DG set shall have an operational life of 10 years.

1.3.2 Technical Experience

The DG set shall be offered from a manufacturer of Diesel Generator set and Diesel Generator set
manufactured by such manufacturer should have been in operation for at least one (1) year as on the
originally scheduled date of bid opening.
Bidder shall furnish the details/document in support of above Technical Experience of manufacturer along
with bid.

1.3.3 Generator Set Configuration

The generator set shall consist of a diesel engine directly coupled to an electric generator, together with the
switchgear, controls, battery and other associated accessories required to provide continuous electric power
for any duration of failure of the normal AC source. The DG sets shall be rated for continuous operation.

1.3.4 Diesel Engine

The Contractor shall provide diesel engines of standard designs of original manufacturers in their DG sets.
It shall be from reputed manufacturers i.e. Kirloskar Oil Engine / Cummins / Ashok Leyland / Mahindra /
Crompton Greaves / Eicher makes conforming to latest BS 5514/ ISO 3046 standards. The bidder shall
submit the details of the engine along with their bid.

The diesel engine shall be direct injection, 4 stroke cycles, multi cylinder, air-cooled/ water-cooled, naturally
aspirated/ turbo charged, instantly started, operating at a nominal speed of 1500 R.P.M. and capable of
developing requisite Brake Horse Power i.e. the rated horsepower of the engine, at the generator
synchronous speed, with all accessories attached, shall not be less than the required power as specified in the
appendices. In addition, the horsepower rating shall take into account the generator efficiency, losses and
maximum rated environmental conditions stipulated in Clause 1.3.19. All moving parts of the engine shall
Rev-02
be mechanically guarded in such a manner that a human finger cannot touch a moving part. The diesel
engine shall be equipped with a dry type air filter system.

1.3.5 Governor

The engine shall be equipped with class A-1 governor or better as per IS 10000 Part-VII or any other
equivalent International standard. The speed regulation shall be as per the above governing class.

1.3.6 Engine Cooling

The bidder may offer air-cooled or water-cooled type DG sets. However, no preference / compensation shall
be applicable for any particular type of offered DG sets. The cooling system shall provide adequate cooling
to the generator set when operated on full load for prolonged periods of time at the maximum environmental
conditions stated in Clause 3.3.19. In case of water-cooled engine, necessary breathing arrangement shall be
provided with the radiator to take care of the expansion/ contraction of the coolant water in the radiator.

1.3.7 Fuel System

The engine shall operate on a commercial grade diesel fuel; no premium fuel shall be required. The DG set
shall be provided with inbuilt fuel storage tank with capacity to last 12 hrs on 100% load. It shall be
equipped with low level fuel alarm potential free contacts for connection to the Equipment NMS system.

The Contractor shall also indicate the fuel consumption of the offered DG sets at 25%, 50%, 75% and 100%
of rated loads along with their bid in the DRS format.

Fuel required to carry out all kind of tests including site acceptance tests shall be supplied by the Contractor.

1.3.8 Exhaust System

The DG set shall be provided with a suitable exhaust system capable of carrying exhaust gases from the
engine and dissipate them to the atmosphere as quickly and silently as possible meeting the latest noise and
emission norms of CPCB. The exhaust system shall be equipped with proper heat shielding to protect
personnel and facilities.

1.3.9 Starting System

The engine shall be equipped with an electric starting system with a 12/24 volt heavy duty lead acid battery
of suitable AH capacity sufficient to provide a minimum of twelve (12) successive abortive starts of the
engine without recharging. A suitable battery charger complete with voltage regulator, float or booster
selector switch, on-off switch, digital voltmeter and ammeter shall be supplied (along with the battery) for
charging the battery from mains. The battery charging system shall operate on an input of 240 V AC, 50 Hz
from the ACDB. The battery shall be housed within the DG enclosure suitably.

The engine control shall provide for multiple crank start-up cycles. Each cycle shall be approximately 10-
seconds of cranking followed by 10-seconds of rest. The starting circuit shall automatically be disconnected
after the start up of the engine. If the engine does not start after three (user adjustable number) attempts, the
starting circuit shall be disabled and an alarm indication ("over crank") shall be provided. A potential free
contact shall be provided to interface these alarms with the Equipment NMS.

The starting time of the DG set in ‘AUTO’ mode shall be continuously and linearly adjustable from 5
minutes to 8 hours from the time of power failure sensing. The starting of DG set shall be based on the
condition of the 48V DC battery voltage (being used for telecommunication equipment) and temperature
inside shelter. For this purpose, the required auxiliary contacts from DC power supply system shall be
available in DCPS cabinet and for sensing temperature inside shelter, the required thermostat shall be

Rev-02
provided by the DG Contractor. The exact time setting and other settings of DG start up shall be finalised
during site acceptance on site-to-site basis based on the actual site conditions.

1.3.10 Instrumentation and Controls

The Employer shall procure DG sets with the capability to extend the controls to external PIU unit equipped
with AMF control panel.
The microprocessor based AMF (Automatic Mains Failure) panel shall be equipped with standard
instrumentation including interlock and protection arrangement, suitable annunciation and indications etc.
for proper start up, monitoring, control and safe operation of the DG set. The AMF shall start the DG set in
case of AC mains failure and transfer the load from normal source to diesel generator without any human
intervention. Similarly on restoration of mains supply it shall be able to transfer the load to mains supply and
switch off the DG automatically.

The AMF panel shall be equipped with following minimum instrumentation:

a). Microprocessor based relay with composite meter for digital display of;
i. AC mains Voltage & Generator Voltage
ii. Generator Current
iii. Power Factor
iv. Output KW meter
v. Output AC frequency meter
vi. RPM indication
vii. Over speed indication
viii. Engine hours indication (Cumulative)

b). Mode selector switch for setting the panel on any one position such as OFF or Auto/
Manual/ Test. The operation of the DG set shall be possible in any of the modes.
c). Engine ON/OFF switch (Push button type)
d). Emergency Stop switch (Push button type)
e). ON delay timer for load change over.
f). ON delay timer for engine shut off.
g). Indicating lamps to indicate ‘Mains ON’, ‘Load on Mains’, ‘DG Running’, ‘Load on
DG’, ‘Battery charger ON’
h). Audio visual alarm for
i. Low lubricating oil pressure
ii. High water temperature (for water cooled DG)
iii. High cylinder head temperature (for air cooled DG)
iv. Start failure
v. DG over load.
i) Suitable battery charger complete with voltage regulator, float or booster selector switch, on-off
switch, digital voltmeter and ammeter for charging the battery from mains operating 240V/ 50 Hz
j). MCCB of suitable rating
k) Two no. contactors of suitable ratings (one for DG set and one for AC mains) with overload
relay.
l) Under voltage relay for Mains.
m) Instrument and control fuses.
n) Any other switch, instrument, relay or contactor etc. essential for smooth and trouble
free functioning of DG set with AMF panel. (To be specified by the bidder with complete detail of the
item).
Standard colour codes and numbered ferrules shall be used for wiring the AMF panel. Sensing and control
relays shall be of continuous duty, industrial control grade type. The transfer breaker shall be rated for

Rev-02
continuous duty. The breaker shall be interlocked to ensure non-paralleling SEB power supply and DG
supply.

Following automatic shut down protection system for DG set shall also be integrated in the control panel;
i. Low lubricating oil pressure shut down.
ii. High coolant (water) temperature shut down.
iii. Engine over speed shut down.
iv. Over load shut down.
v. Short Circuit shut down.
vi. Over Voltage shut down
vii. Low Fuel Level
viii. Earth Fault shut down.
ix. Emergency Stop

The AC mains supply shall be of either single Phase or three Phase. The loads connected shall be single
phase in nature.

1.3.11 Alternator
The Contractor shall supply alternators in their offered DG sets only from the reputed manufacturers i.e.
Crompton-Greaves / Kirloskar / FG Wilson / ELGI / KEL makes as per latest BS 5000/ IS 4722 standards.
Details of alternator shall be submitted by the Contractor along with the bid.

The alternator shall be self excited, self regulated, screen protected, double bearing, brushless type, drip
proof, continuous duty type, synchronous and suitable for 1500 RPM. 0.8 P.F lagging, horizontal foot
mounted, with class H insulation.

The alternator shall also have a solid state type Automatic Voltage Regulator (AVR) suitable for single
running with control limits of 1% from no load to full load under normal load changes. It shall be of static
type and complete with cross current compensation. The regulator shall be provided with voltage adjusting
potentiometer and shall be complete with all alarm contacts, internal wiring etc.

The alternator shall be capable of carrying 50% overload for a duration of one minute.

The alternator shall be suitable for 20% over speed for two minutes.

The alternator shall be capable of carrying 10% overloading for one hour in any period of 12 hrs running
without injury.

1.3.12 Mounting Arrangement

Engine and alternator shall be mounted on a common MS fabricated base frame with anti vibration pads.

1.3.13 DG set Enclosures

1.3.13.1 A suitable weather-proof enclosure which shall be provided for protection from rain, sun, dust etc.
Further, in addition to the weather proofing, acoustic enclosures shall also be provided such that the noise
level of acoustic enclosure DG set shall meet the requirement of MOEF The diesel generator sets should
also conform to Environment (Protection) Rules, 1986 as amended. An exhaust fan with louvers shall be
installed in the enclosure for temperature control inside the enclosure. The enclosure shall allow sufficient
ventilation to the enclosed D.G. Set so that the body temperature is limit to 50°C. The air flow of the exhaust
fan shall be from inside to the outside the enclosure. The exhaust fan shall be powered from the DG set
supply output so that it starts with the starting of the DG set and stops with the stopping of the DG set. The
enclosure shall have suitable viewing glass to view the local parameters on the engine.

Rev-02
1.3.13.2 Fresh air intake for the Engine shall be available abundantly; without making the Engine to gasp
for air intake. A chicken mess shall be provided for air inlet at suitable location in enclosure which shall be
finalized during detailed engineering.
1.3.13.3 The Enclosure shall be designed and the layout of the equipment inside it shall be such that there
is easy access to all the serviceable parts.
1.3.13.4 Engine and Alternator used inside the Enclosure shall carry their manufacturer’s Warranty for
their respective Models and this shall not degrade their performance.
1.3.13.5 Exhaust from the Engine shall be let off through Silencer arrangement to keep the noise level
within desired limits. Interconnection between silencer and engine should be through stainless steel flexible
hose/ pipe.
1.3.13.6 All the Controls for Operation of the D.G. Set shall be easily assessable. There should be
provision for emergency shutdown from outside the enclosure.
1.3.13.7 Arrangement shall be made for housing the Battery set in a tray inside the Enclosure.

1.3.14 Construction Features:

1.3.14.1 The enclosure shall be fabricated from at least 14 Gauge CRCA sheet steel and of Modular
construction for easy assembling and dismantling. The sheet metal components shall be pre-treated by Seven
Tank Process and Powder coated (PURO Polyester based) both-in side and out side – for long life. The hard-
ware and accessories shall be high tensile grade. Enclosure shall be given a lasting anti-rust treatment and
finished with pleasant environment friendly paint. All the hardware and fixtures shall be rust proof and able
to withstand the weather conditions.
1.3.14.2 Doors shall be large sized for easy access and provided with long lasting gasket to make the
enclosure sound proof. All the door handles shall be lockable type.
1.3.14.3 High quality rock wool of required density and thickness shall be used with fire retardant thermo
– setting resin to make the Enclosure sound proof.
1.3.14.4 Points for Neutral/Body earthing shall be available at two side of the enclosure with the help of
flexible copper wires from alternator neutral, and electrical panel body respectively. The earthing point shall
be isolated through insulator mounted on enclosure.

1.3.15 Main Circuit Breaker of DG

The DG set shall be connected to the Input ACDB buses through main circuit breaker (MCCB type).
Separate cables from DG set to the breaker shall be laid to extend DG power supply.

1.3.16 DG Set Mode of Operation

Operation of DG set shall only be allowed when the selector switch is in the Manual/Automatic/Test posi-
tions. Moving the selector switch to the OFF position shall properly shut down the generator set, remove it
from the AC loads and inhibit it from starting in any mode. The DG set shall be capable of operation in the
following modes;

1.3.16.1 Start Operation

a. Auto Mode
b. Manual Mode
c. Test Mode

1.3.16.1.1 Auto Mode

In the ‘AUTO’ mode, the DG Set shall start only after a set time delay when either the primary AC source
has failed or conditions prevail as indicated below;

When the main source power fails, the DG set shall include detection and control to automatically
disconnect the primary AC source, start the DG set and extend power to ACDB after the set time period of
Rev-02
the timer. The time delay is continuously & linearly adjustable at site from 5 minutes to 8 hours as specified
at Clause 5.2.6. The engine shall also start automatically after detecting a predefined temperature (20 oC to
55 oC continuous) inside the shelter or initiation from 48V DC under-voltage contact from DCPS. All
required control like thermostat, extension of potential DC under-voltage contact from DCPS shall be
provided by the Contractor to support the above controls.

All phases of primary AC sources voltage shall be monitored. The automatic start-up system shall detect
failure or abnormal conditions specified and start the generator set. At the time of loss of primary voltage or
an abnormal condition of low phase voltage, a start control shall be initiated. The automatic start shall try the
start-up of the generator set for three successive attempts. If the primary AC returns during the start-up
attempt, the start-up sequence shall be stopped.

If at any time during operation of the generator set the selector switch is set to ‘OFF’ position, the generator
shall shut down and be disabled from starting.

1.3.16.1.2 Test Operation

A test operation of DG set shall be possible by putting the control switch in “TEST” position from where the
generator shall initiate an automatic start, just as if there had been a power interruption to the primary power.
Upon removal of the selector switch from “TEST” position, the generator shall initiate an automatic
shutdown sequence. However, there shall be interlock such that Main circuit breaker of DG set is in ‘OFF’
condition while the engine is started in “TEST” position.

1.3.16.1.3 Manual Operation

When the control switch is in “MANUAL” position, the generator set can be started using the manual start
push-button on the control panel. The generator set will be stopped by setting the control switch back to the
“OFF” position or by pressing stop button on the AMF panel. During manual operation, all main and AC
source breakers must be operated manually to transfer load to or from the generator set.

1.3.16.2 Automatic Shutdown

When the primary power is restored and remains normal continuously for a period of 5 minutes (locally user
adjustable from 0 to 15 minutes), the load will be switched over from DG set to primary power and the
generator shall be automatically stopped and be enabled for another future start-up request.

1.3.17 Remote and Local Monitoring

The DG set shall be capable of being monitored from remote as well as local.

1.3.17.1 Visual Annunciation

The following minimum visual annunciation shall be provided for DG set shut down due to:

(i) Low fuel level

(ii) Engine failed to start (failed to start in 60 sec. after receiving the first start impulse)

1.3.17.2 Remote Monitoring

The above parameters shall also be monitored remotely through telecom equipment NMS or any other
independent remote monitoring arrangement. Suitable potential free dry contacts (NO) for this purpose shall
be provided by the Contractor. The contractor shall do all the required wiring for such purpose.

1.3.18 General Requirements

The DG sets shall be generally installed at outdoor positions near to the shelter locations. The DG sets shall
be installed either on ground near to Shelter installed at ground or on rooftop near to shelter installed at roof
top. However, in some cases, the DG sets may be installed on ground and shall be connected to shelter

Rev-02
installed on rooftop. The exact requirement shall be finalised during detail engineering based on actual site
conditions.

1.3.18.1 Mounting and Installation

The generator set shall be skid mounted using anti vibration pads. At some locations, DG set may be
installed on the rooftop. The required RCC floor/ PCC pedestals shall be provided by the Contractor.

1.3.18.2 Earthing
The Contractor shall suitably connect the DG sets with the integrated earthing system being provided by the
Contractor under this package. The neutral of alternator shall be earthed separately.

1.3.18.3 Trenching
The Contractor shall prepare necessary cable routes for installing cables and earthing system from DG set to
the shelter and earthing pits. The cables shall always be installed inside the GI pipes of suitable size
embedded properly with PCC finish. In case the DG set is installed on ground and the shelter is installed at
roof top, the necessary cable trenching/ GI pipe shall be provided from DG set to the building ground from
where the cables shall be installed in the wall of the building. The cable trays with proper cover and supports
shall be provided from bottom of the trench at the ground near the building up to the shelter installed at the
roof top. The Contractor shall submit the detail drawings for the same for Employer’s approval.

1.3.19 Operating Environment

The generator sets shall operate within the following ambient environmental requirements:
(a) Operating temperature range: +2°C to +50°C
(b) Maximum relative humidity at 23°C of 95% (non-condensing)
(c) In non-filtered air containing a high proportion of dust
(d) In a corrosive atmosphere (at high humidity)
(e) At altitudes of up to 500 metres above sea level
(f) The equipment must withstand mechanical vibrations as defined in the IEC 68-2-6 test requirements.

1.3.20 Cables and ACDBs

All cables of required size and ratings for proper functioning of the DG set including all accessories shall be
supplied, installed and terminated by the Contractor.

1.3.20.1 AC Distribution Boards

The contractor shall provide AC Distribution Boards associated with each system. The AC distribution
boards shall distribute power to the equipment and provide protection against failures on feeder circuits.

Generally, ACDBs shall be part of Power Interface unit (PIU), however, at few locations, Standalone ACDB
shall be required where PIU is not required. ACDBs shall be wall mounted enclosure/panel as finalized
during detailed engineering. They shall have indicating lamps and voltmeter to indicate three phase voltage
on the bus.

The MCCB and sub-assemblies shall be easily replaceable and maintainable. The MCCBs of requisite
ratings must conform to IEC-60947-2 and IS 13947-2/IEC 60947-2. All MCCBs shall provide over-current,
short circuit protection and coordinate with associated breakers in upstream & downstream such that faults
are cleared reliably with discrimination.

The contractor shall extend safety earth connections from Input ACDB panel & Output ACDB panel to
nearest earthing system being provided under this contract.

Rev-02
1.3.21 Testing of DG sets
1.3.21.1 Type Test
The Contractor shall submit the earlier carried type test reports for the engines, Alternator & enclosure of the
offered DG sets for the highest rating of offered DG set as per the latest relevant IS standards or equivalent
International standard for Employer’s approval. The type tests on Alternators shall be carried out as per
Table 5.10(a) as given below.

1.3.21.2 Factory Acceptance Test

A complete DG set shall be assembled and installed at factory as being envisaged at site and shall be run to
check proper installation and assembly of all items of the DG set. It shall demonstrate all specified design
features and functional requirements as per specifications, for adopting the same at sites. Manufacturer’s
internal test reports of Alternators for each DG set shall be submitted during FAT.

Table-5.10(a)
List of Tests for DG Set
SNo. Test Type Factory Site
Test Acceptance Acceptance
Test Test
A. ALTERNATOR
1. Measurement of resistance √
2. Regulation test √ √ √
3. Measurement of open circuit characteristics √
4. Measurement of short circuit characteristics √
5. Efficiency test √
6. Temperature rise test √
7. Occasional excess current test √
8. Over speed test √
9. Insulation resistance (both before & after high √
voltage test)
10. High Voltage test √
11. Determination of deviation of voltage waveform √
sinusoidal
Note : All the above tests as per IS: 4722 or equivalent International standard
B. DG Set (including Alternator)
1. Noise and vibration test For all √
2. Load Test Type √ √ (Note )
tests
3. Functional tests on control panel, starting √ √
provision AVR and speed governor
Note: SNo. 1 above: As per standard IS 12065/12075 or equivalent International standard.
1)During FAT, Load test shall be conducted on each rating of DG sets before dispatch to site as
follows:
a) No load test for 15 minutes
b) 100% Load test for 8 hrs
c) 110% load test for 1 hr
2) During SAT, 6 hours load test shall be carried out with existing load.
Rev-02
 SNo. Test Type Factory Site
Test Acceptance Acceptance
Test Test
3) The Oil consumption, governing, noise and vibration shall be recorded during the testing period.
Further during above test, AMF panel associated with highest rating DG set shall be integrated to
check all the functional requirements and other requirements as per technical specifications.
---End of Table---

1.3.21.3 Site Acceptance Test

After successful installation of the DG set, Site Acceptance Testing for each DG set shall be carried out at
respective site. The total installed system in power up condition shall be tested for the specified functional
requirements. The minimum requirements for SAT are given in Table 5.10(a) above. The timer setting for
automatic DG set starting after normal power supply failure and for automatic shut off after restoration of
normal supply shall be done at each site based on the actual site conditions. The detailed SAT procedure
shall be submitted by the Contractor for Employer’s approval.

1.3.22 Marking

The following information shall be provided on each DG sets:

g. POWERGRID and its logo

h. DG Set location name
i. Identification no.
j. Year of Manufacture
k. DG set dimension
l. DG set weight
m. KVA rating, HP Rating
n. Voltage, Per phase current

1.3.23 Tool Kit

One set of following tools of Taparia or other reputed make shall be supplied with each DG set;
Tool kit
SNo. Item Description Unit Qty
1 Digital Multimeter No. 1
2 Cutter No. 1
3 Pliers No. 1
4 Nose Pliers No. 1
5 D Spanner set (All sizes from 6 mm to 22 mm) Set 1
6 Ring Spanner set (All sizes from 6 mm to 22 mm) Set 1
7 Cable Cutter No. 1
8 Hammer – 250 gm with handle No. 1
9 Hack Saw No. 1
10 Wire Stripper No. 1
11 Screw Driver Set (-) type (6 Nos. of different sizes) Set 1
12 Screw Driver Set (x) type (6 Nos. of different sizes) Set 1
13 Tool Box (To accommodate all the above specified tools) No 1
--End of Table--

1.4 Requirements for Power Interface Unit (PIU)

1.4.1 General Requirements

Rev-02
Power Interface Unit (PIU) shall integrate the surge protection devices, AMF panel for DG control, AC
voltage stabilizer, and AC distribution panel etc. in a single unit to save the valuable floor space inside the
shelter and to provide quality AC power supply to the various systems including SMPS based DC power
supply system, air conditioning system etc. used in telecom applications.

The PIU unit to be supplied shall have an operational life of 15 years.

1.4.2 System Configuration

PIU unit shall consist of following subsystems integrated in a single cabinet suitable for indoor installations.

1) Healthy Phase Selector

2) Surge Protection Devices
3) Static Voltage Stabilizer
4) AMF Panel
5) PIU controller
6) AC distribution panel

1.4.3 Healthy Phase Selector

Generally the AC supply shall be taken directly from available rural/urban overhead distribution supply.
Healthy phase selector shall select the healthy phase out of the available phases. PIU in one of the following
three configurations shall be provided at each location;
i) 15kVA PIU working on best two phase with input voltage 240-480 Normal L-L for Urban
locations
ii) 10kVA PIU working on best single phase with input voltage 155-280 Normal L-N for Rural
locations
iii) 10kVA PIU working on best single phase with input voltage 155-280 Normal L-N for Rural
locations capable of controlling two DG sets (as per clause 6.3.7)

Suitable circuitry along with all hardware, cables, relays, sensors etc. shall be so provided that it shall be
possible to select the healthy phase(s) automatically and have the output at the stabiliser and the load
requirement can be met. The Contractor shall submit the scheme for Employer’s approval during detail
engineering.

There should be a Manual by pass arrangement for bypassing the Healthy Phase Selector.

1.4.4 Lightning & Surge Protection

The PIU unit shall be equipped with lightning and surge protection devices to provide protection to all the
equipment being connected and integrated against incoming lightning and low voltage surges. The
lightning/surge protection shall be in compliance with IEC-61312, IEC-61024 and VDE-0100-534 for
following surges:

A) Lightning Electromagnetic impulse and other High Surges (Class B):

Between Requirement
R, Y, B & N Iimp ≥ 50 kA, 10/350 µS for each phase
N & PE Iimp ≥ 100 kA, 10/350 µS
Iimp= Value of Lightning Impulse Current

B) Low Voltage Surges (Class C)

Rev-02
Between Requirement
R, Y, B & N In ≥ 10 kA, 8/20 µS for each phase
N & PE In ≥ 20 kA, 8/20 µS
In= Value of Nominal Discharge Current.
The protection system for both the above stages shall be reusable after clearance of surge. In case of fault,
provision for manually bypassing the protection system should be available to ensure the operation without
protection system. The manufacturer shall give complete details of the arrangement provided for the purpose
during detail engineering and also ensure and demonstrate the effectiveness of the arrangement. Test
Certificate from a reputed third party lab may be accepted provided the protective devices of both stages
have been tested in the same lab.

1.4.5 Static Voltage Stabilizer

AC Static automatic voltage stabiliser using microprocessor based controller shall provide the stabilised
quality power supply to the air-conditioners, battery charger, lighting etc. through ACDB. The
capacities/ratings of voltage stabiliser shall be as per appendices. The stabiliser shall conform to the
following parameters specified in Table 6.1 below:

Table 6.1
S. No. Items PIU for Urban locations PIU for Rural locations

1 Input Power 3 Φ, 4 wire 3 Φ, 4 wire

Input Voltage (Volts) 240-480 Normal L-L on 155-280 L-N when working on
2 best two phase working single phase

Output Voltage (Volts) 230 V± 10% (Single 230 V± 10% (Single Phase)
3
Phase)
4 Voltage correction speed 400 V in 1 μsec 400 V in 1 μsec
5 Efficiency (excluding IT) > 96% > 96%
6 Frequency 48 – 52 Hz 48 – 52 Hz

1.4.6 Automatic Mains Failure (AMF) Panel

The PIU unit shall support the microprocessor based AMF panel for various capacity DG sets as per BoQ.
The AMF shall start the DG set and transfer the AC load from normal source to diesel generator
automatically in case of AC mains failure with availability of other conditions as per section 5.6.1.1 of this
specification. Similarly on restoration of mains supply it shall be able to transfer the load to mains supply
and switch off the DG automatically. Provision for a suitable delay shall be kept for starting of DG and
changeover of load between DG & Mains.

The AMF panel shall be equipped with suitable instrumentation, interlock and protection arrangement,
suitable annunciation and indications etc. as defined in the Section 5.2.7 of this specification for proper start
up, monitoring, control and safe operation of the DG set.
An option for selection of Auto / Manual Mode operation should be provided on the front panel of the PIU.
Operation (Start / Stop) of the DG set in manual mode should be available on the PIU. In manual mode,
AMF logic will be totally bypassed. However during manual mode, the DG protections will not be
bypassed. A change over switch shall also be provided for total bypassing the AMF.

Rev-02
1.4.7 PIU Controller
Contractor shall integrate the Alarms of various Auxiliaries of shelter with the PIU and Alarms shall be
monitored by Central Supervisory Unit. Central Supervisory Unit shall be designed to facilitate better
interface of man and machine. It shall consist of High-Speed micro controller displaying true RMS for all
voltage & current through LCD display. All the inputs to the measurement board shall be duly protected
against surge as per IEEE-62.41. The measurement circuit shall be rated at 1.5 times the maximum input
range. The unit shall be equipped to log 500 events with date and time stamping including DG start and stop
logs. It shall display various site conditions like Mains ON, DG ON, Smoke/ Fire Alarm, Over Load,
Charger MODULE fail, DG Fuel Low, DG fail to start, DG fail to stop, Alternator fail, LLOP, DG overload,
Mains Fail, Site battery low, DG battery low, HCT/HWT, High Shelter temperature etc. Various Mains and
DG related measurements viz. Mains energy measurement, DG energy measurement, DG accumulated
hours, peak energy requirement of site etc. shall also be displayed.

Contractor shall integrate and extend the Potential Free Contacts for monitoring at NOC for following
minimum alarms;

i) Mains Fail
ii) Door Open
iii) High Room Temperature
iv) DCPS battery Low
v) Rectifier Fail
vi) Fire and Smoke
vii) DG Fail to Start
viii) LLOP
ix) Fuel Low
x) DG ON LOAD
xi) DG ON
xii) HCT
xiii) DG Over speed
xiv) DG Fail to Stop
xv) Other Common DG Faults

It must support a RS 232 port for PC interface for programming / reconfiguration of the parameters through
laptop.

1.4.8 AC Distribution Panel

There shall be AC distribution panel for termination of the load. The SMPS, Air conditioners etc. shall be
connected to this AC distribution panel through suitable MCBs. The ratings of the MCBs shall be selected to
provide safe and continuous operation of the DCPS system, Air conditioning system etc being supplied
under this contract. The Contractor shall submit the details of MCB ratings for Employer’s approval.

The AC mains and DG set shall be connected to PIU unit through MCCBs of suitable ratings.

1.4.9 PIU with Dual DG logic

At few of the remote Telecom locations, two DG sets may be required. For those locations, PIU capable of
controlling two DGs shall be supplied. In case of power failure, command shall always go to that DG which
was in standby mode during previous cycle of Power failure. For the sites operated purely on DG supply, the
logic shall be to run the DG Set for a prefixed time with in the range of 0 to 10 hrs. After every set time of
DG run the load of the Repeater Shelters need to be shifted to battery bank. DC load need to be fed through
battery till time either shelter temperature exceeds the set threshold or battery bank voltage falls below the
set threshold. In case of crossing of any of these thresholds, the PIU to give DG start command to second

Rev-02
DG set. DG sets supplied under earlier packages having capacity 15kVA or below may also be available at
sites.

1.4.10 Constructional Features of Rack

Only a single cabinet shall accommodate all the systems that include phase selector, surge protection
devices, static voltage stabilizer, AMF panel and PIU controller, digital displays and meters, wires and
cables, associated sub systems etc. The dimensions of the rack shall be such that it shall occupy minimum
space inside the shelter.

The enclosure (rack) shall be freestanding type of design and shall have sufficient structural strength to
withstand the ultimate mechanical load capacity without any deformity. Cable entry shall be from the
bottom/top of the enclosures. The design of the rack (enclosure) shall be modular allowing easy maintenance
and installation such that replacement or taking out of one subsystem for repair or maintenance shall not
require dismantling of whole system. The rack shall be free of sharp edges or sharp corners. Rack mounting
arrangement shall provide easy access from front, rear and top for installation and maintenance.

Where cables pass through metal panels suitable arrangement including bushings shall be provided to
protect cables from damage. Bus-bars shall be suitably spaced and insulated to prevent any possibility of
short circuit between bus-bar and/ or rack.

With doors in position, all visual alarms and meters shall be clearly visible. In case of hinged doors, meters
and alarm indicators are permitted on the door provided the fixtures on the door do not restrict the
movement of door in any way.

1.4.10.1 Components
The component parts of the equipment shall be of professional grade from reputed manufacturer to ensure
continuous and safe operation of the equipment including its sub systems. The component shall conform to
relevant IEC/IS standards and Complete PIU unit shall ensure compliance to safety as per IEC-60950 or any
other international standard.

1.4.10.2 Finish and Painting

The finish of Steel/Aluminium structure and panels shall conform to relevant IS specification (or equivalent
international specifications). The colour scheme for Rack, Door and Modules shall be decided during
detailed engineering.

1.4.10.3 Earthing
The PIU unit including its subsystems shall be properly earthed by connecting it to the earthing system
being provided by the Contractor under this Package.

1.4.11 MTBF
The mean time between the faults of the PIU and its subsystems shall be more than 70,000 hrs.

1.4.12 Installation
The transportation of PIU unit and its complete installation at respective sites as per attached appendices
shall be carried out by the Contractor. All type of cables or associated accessories shall be supplied and
installed by the Contractor. Connection to SEB supplied AC mains and ACDB etc shall also be carried out
by the Contractor

1.4.13 Testing

Rev-02
1.4.13.1 Type Testing
PIU shall conform to EMI/EMC requirements as per IEC-870-2-1 standards. It shall also conform the
Environmental requirements as per the TEC Standard for Environmental testing i.e. SD: QM-333 Mar 2010
(with amendments, if any) in category B2.
Electrical and mechanical safety and Performance test shall also be carried out on PIU as per specification.
The Contractor can also submit the earlier carried out type test reports on the offered system for above tests.

1.4.13.2 Factory Acceptance Testing

The Contractor shall submit the detailed format of factory acceptance testing plan for PIU unit incorporating
various tests for testing of all its systems and sub systems and get it approved from the Employer. The FAT
shall be conducted on the offered PIU units as per approved FAT tests and procedure.

1.4.13.3 Site Acceptance Test

After successful installation, the site acceptance testing for PIU unit including its subsystems shall be carried
out by the Contractor for each site demonstrating all its functions properly. The detailed SAT procedure
shall be submitted by the Contractor for Employer’s approval.

1.5 DC Power Supply system

In order to provide reliable power supply to communication equipment at various locations, 48 V DC Power
Supply (DCPS) system is to be provided as a part of this project. This section describes the technical
requirement of DC power supply & associated Battery.

The DC Power Supply system shall be capable of meeting the load requirements for various Telecom
equipments. The rating of offered SMPS modules shall meet Employer’s requirements of DCPS system as
stipulated in the BoQ.

The DC Power supply system shall have a single DCPS system as per conceptual configuration diagram
given in Fig.3-1, shall be supplied.

Surge protection devices shall be installed in the DCPS panel to provide adequate protection against current
and voltage transients introduced on input mains AC due to load switching and low energy lightning surges.
These protection devices shall be in compliance with IEC 61312, IEC 61024 and VDE 0100-534 for
following surges:

It shall be provided with Class ‘B’ & ‘C’ type surge protection device. The device must be provided with
Class B type lightning current arrester (Switching Type) with a discharge current capacity of at least 50 kA,
10/350 µs, and Class C type surge arrester (linear device) as per IEC 61643-1. The blind spots shall be
avoided in accordance to IEC 61312. The Class ‘C’ surge protection device should be pluggable type,
equipped with features of thermal disconnection, & health indication and potential free contacts for surge
arrestors connected between phase & neutral.

The surge protection device shall comply to IEC 61643.

1.5.1 General Technical Requirements for SMPS based DC power supply units

SMPS based DC power supply system is to be used in Auto Float-cum-Boost Charge mode as a regulated
DC Power source. DCPS system is to be installed indoors and shall be provided with IP21 panels. The
System shall consist of the following:

SMPS modules
Rev-02
 a) Controller module to control and monitor all DCPS modules.

The Panel, Distribution/Switching arrangement shall be provided for the ultimate system capacity. Ultimate
System capacity is defined as 150% of the present capacity specified. The ultimate capacity is over and
above the requirement of redundancy wherever specified. All factory wiring for the panel shall be for the
ultimate capacity so that only plugging-in of SMPS module shall enhance the DC power output.

The size of fuses, MCBs, switch, bus etc shall be suitable for the ultimate capacity.

The SMPS modules of DCPS system shall be suitable for operation from single phase A.C. mains/DG set
supply. However, the input AC mains supply to DCPS system shall be 3-phase, 4 wire which shall be evenly
distributed among all the offered SMPS modules.

1.5.1.1 Operational/Component Requirements

The basic modules shall operate at specified ratings and conform to requirements stipulated in this
specification. The DCPS system shall meet requirement of the latest TEC specification / IEC/BS for other
parameters as applicable.

1.5.1.2 Wiring

All insulated conductors except those within the confines of a printed circuit board assembly shall be of the
rating enough to withstand the maximum current and voltage during fault and overload. All insulated
conductors/cables used shall conform to IS 1554 or equivalent international standard.

1.5.1.3 Bus Bars

High conductivity Cu bus bar shall be provided and shall be sized to take care of the current of ultimate
DCPS system capacity for which it is designed. However, it shall not be less than 25mm X 5mm.

1.5.1.4 Earthing

Two earth terminals shall be provided in the frame of the system. The Contractor shall connect these earth
terminals to the earth bus. All modules and devices shall be connected to these earth terminals. The hinged
door, if provided shall be connected to the panel with braided Cu at two points at least.

1.5.1.5 Marking and Labelling of Cables

The Contractor shall propose a scheme for marking and labelling the inter panel cables by Halogen &
Silicon free labels of polyamide ensuring scratch proof labelling with the use of solvent free ink & latest UV
Technology making it environment friendly printing with a WIPE RESISITANCE according to DIN EN
61010-1/VDE 0411-1 and get it approved from the Employer. A cabling diagram, screen printed or any
other better arrangement ensuring better life expectancy shall be placed in the inside of the front door or any
other convenient place for ready reference of the maintenance staff.

1.5.1.6 System and Panel Configuration

The mechanical and electrical requirements of the Panel are described as below:

1.5.1.7 System Configuration

The SMPS modules shall be accommodated in panels. The system shall employ a modular configuration to
provide flexibility, keeping in view the future load requirements of DC Power. The system shall be

Rev-02
configured for ultimate capacity as brought out in Section 3.1. The Control, Monitoring, Alarm arrangement
and DC & AC distribution shall be provided suitably in the panel.

The SMPS modules shall be provided as per the load requirement stipulated in the Appendix, BOQ. The
DCPS system shall comprise of N+2 Modules. In case of DCPS system having N=1, the SMPS shall
comprise of N+1 modules. Here N refers to number of SMPS modules to meet the load requirements
specified in the Appendix, BOQ and battery charging current. The current rating of each module shall be
considered as output current of the SMPS module at nominal voltage (48V).

Total current = load current + battery charging current

Where, battery charging current is equal to the 20 % AH of the battery supplied.

Total Current
N=
Current rating of each SMPS module at 48 V

The Distribution/switching/Alarm unit shall be provided for the ultimate system capacity. All AC, DC or
control/alarm cabling/wiring shall be pre-wired for the ultimate capacity so that mere plugging-in of SMPS
module shall add to the DC power output.

1.5.1.8 Constructional Features of Panel

For the enclosures/panel, the front door (if provided) shall not be wider than 80 cm and rear door may be of
hinged or removable type with locking as per standard design of the manufacturer. Keyed locking is
required with identical keys for all enclosures. The enclosures shall not exceed 220 cm in height. The
thickness of the structural frames and load bearing members shall be minimum 2.0 mm and for others shall
be minimum 1.6 mm. The panels/boards shall be equipped with necessary cable gland plates. The degree of
protection of DCPS enclosures shall preferably be IP21.

Conductors in multi conductor cables shall be individually colour coded, and numbered at both ends by
Halogen & Silicon free labels of polyamide ensuring scratch proof labelling with the use of solvent free ink
& latest UV Technology making it environment friendly printing with a WIPE RESISITANCE according to
DIN EN 61010-1/VDE 0411-1within enclosures.

Each panel shall be supplied with 240 VAC, 50Hz single-phase sockets with switch and lighting lamp for
panel illumination.

The Panel shall be designed to allow cooling preferably by natural convection. The Contractor shall submit
detail design of proposed Panel/enclosure and heat dissipation calculations during detailed engineering.
Forced cooling is permitted (DC Fans are permitted in the Panel or SMPS module) for equipment mounted
indoors (buildings/rooms/shelters). Proper filtering shall be provided to control dust ingress. There shall be
an arrangement for automatic Switching-OFF of fans during AC input failure.

1.5.1.9 Electrical Requirements:

AC input supply: The nominal input frequency is 50 Hz, which may vary from 47.5-52.5Hz. The input
voltage shall be as mentioned below:

Field Site Application – Three phase/4Wire (Nominal 415/240 V): 415 + 10 % - 15%. However, at site the
voltage may vary from 160V to 300V (Ph-N). An Auto-Mains Changeover unit shall be provided for each
field site DC power supply system. The Auto-Mains Changeover unit shall accept input from two AC
sources and extend any one of the available healthy sources to the DC Power supply system.

Rev-02
The suitable HVD (High Voltage Disconnector) Protection shall be provided at input of each DCPS system.
This HVD protection shall protect the SMPS modules of DCPS system against the sustained over voltage at
the input.

A tolerance of ±5V may be acceptable for protection & alarm operation.

1.5.1.10 DC output Characteristics of Modules

The module shall be capable of operating in “Auto Float-cum-Boost Charge” mode depending on the
condition of the battery sets being sensed by the Control unit.

(a) The float voltage shall be continuously adjustable & pre-settable at any value in the range of –48 to –
56V or as per battery manufacturer recommendations either at the module or may be set from the
common controller configuration. Further, the prescribed float voltage setting shall be based on
recommendations of the battery supplier.

(b) In Boost charge mode, DCPS shall supply battery & equipment current till terminal voltage reaches set
value, as recommended by the battery supplier & shall change
over to constant voltage mode

(c) The DC output voltage variation shall not be more than 2% for load variation from 25% load to full
load.

1.5.1.11 Current Limiting (Voltage Droop)

The current limiting (Voltage Droop) shall be provided in DCPS SMPS modules in float and boost charge modes of operation.
The float/boost charge current limiting shall be continuously adjustable between 50 to 100% of rated output current for output
voltage range of –44.4 volts to –56 Volts or as per manufacturer’s specified catalogue.

The float and boost charge current limit adjustment shall be provided in the DCPS system. The SMPS modules shall be fully
protected against short circuit. It shall be ensured that short circuit does not lead to any fire hazard.

1.5.1.12 Soft/Slow Start Feature

Soft/Slow start circuitry shall be employed such that SMPS module input current and output voltage shall reach their nominal
value within 10 seconds.

The maximum instantaneous current during start up shall not exceed the peak value of the rectifier input current at full load at the
lowest input voltage specified.

1.5.1.13 Voltage Overshoot/Undershoot

The requirements of (a) to (c) given below shall be achieved without a battery connected to the output of SMPS modules.

(a) The SMPS modules shall be designed to minimize DC output voltage Overshoot/Undershoot such
that when they are switched on the DC output voltage shall be limited to ± 5% of the set voltage &
return to their steady state within 20 ms for load variation of 25% to 100%.

(b) The DC output voltage overshoot for a step change in AC mains as specified in clause 4.3.12
Electrical Requirements shall not cause shut down of SMPS module and the voltage overshoot shall
be limited to ± 5% of its set voltage and return to steady state within 20ms.

(c) The modules shall be designed such that a step load change of 25 to 100% and vice versa shall
not result in DC output voltage Overshoot/Undershoot of not more than 5% and return to steady
state value within 10 ms without resulting the unit to trip.

Rev-02
1.5.1.14 Electrical Noise

The Rectifier (SMPS) Modules shall be provided with suitable filter at output with discharge arrangements
on shut down of the modules. The Psophometric Noise (e.m.f weighted at 800Hz) with battery connected
across the output should be within 2 mV at full load at nominal input AC supply. For test purposes, this shall
be taken as equivalent to 4mV when the battery is not connected and in accordance to ITU-T Rec. O.41.

Voltage at the output of the Rectifier (SMPS) module, without battery connected, shall not exceed 300 mV
at the switching frequency measured by an Oscilloscope of 50/60 MHz bandwidth (Typical).

1.5.1.15 Parallel Operation

SMPS modules shall be suitable for operating in parallel with one or more modules of similar type, make
and rating, other output conditions remaining within specified limits.

The current sharing shall be within ± 10% of the average current per rectifier module individual capacity of
each rectifier module in the system (mounted in the same or different Panels) when loaded between 50 to
100% of its rated capacity for all other working conditions.
1.5.1.16
1.5.1.17 Protection

The SMPS module, which has failed (for any reason) shall be automatically isolated from the rest of the
modules and an alarm shall be initiated for the failure.

1.5.1.18 DC Over voltage protection

DCPS shall be fitted with an internal over voltage protection circuit.

In case output DC voltage exceeds –57V or as per the recommendations of the manufacturer of batteries, the
over voltage protection circuit shall operate & shut off the faulty module. A tolerance of ± 0.25V is
permitted in this case.

Shutting off of faulty SMPS module shall not affect the operation of other SMPS modules operating in the
Panel. Operation of over voltage shut down shall be suitably indicated and extended monitoring/control unit.
The circuit design shall ensure protection against the discharge of the Battery through the SMPS module in
any case. The over voltage protection circuit failure shall not cause any safety hazard.

1.5.1.19 Fuse/Circuit Breakers

Fuses or miniature circuit breakers (MCB) shall be provided for each SMPS module as follows:
1. Live AC input line
2. Control Circuit
All fuses/circuit breaker used shall be suitably fault rated.

1.5.1.20 AC Under/Over Voltage Protection

AC input Under/Over voltage protection shall be provided as per clause 3.1.11 for Electrical Requirements.
The DC side of the SMPS should also be provided with surge protection device to protect the SMPS in case
of transients being generated by the loads or due to induction in the DC line from the AC line running
parallel together. The Surge protection device should be able to discharge a current of at least 10 kA of 8/20
µs (Class ‘C’ surge arrestor), pluggable and should have indication to show its health to facilitate the
replacement on fault condition.

1.5.1.21 Over Load/Short Circuit Protection

Rev-02
The SMPS shall be protected for Over load/Short circuit as per clause 3.1.13 Current Limiting (Voltage
Droop).

1.5.1.22 Alarms and indicating lamps

Visual indications/display such as LEDs, LCDs or a combination of both shall be provided on each SMPS
module for detection of SMPS module failure.

1.5.1.23 Termination

Suitable termination arrangements shall be provided in the panel for termination of inter cubicle cables from
other equipment such as Employers ACDB, Telecom and other associated equipments and alarm cables.

1.5.1.24 DC Terminations

All terminations including through MCBs shall be through lock and screw type terminations. Load and
batteries shall be connected to DCPS through appropriate MCBs. The isolation of any of the battery from the
load shall create an alarm. DC distribution shall be provided with adequate no. of feeders with appropriate
MCBs (6 Amp thru 32 Amp) for termination of the loads. Actual rating of the MCBs shall be finalized
during the detail engineering. The no. of feeders shall be minimum 10 (ten) nos.

DC distribution may be done either on wall mounted panel or on the DCPS panel. The proper rated MCB
shall be provided at the combined output of the SMPS modules (if not provided at each SMPS module). All
the AC, DC and Control/alarm cabling shall be supplied with the Panel. All DC +ve and –ve leads shall be
clearly marked. All conductors shall be properly rated to prevent excessive heating.

1.5.1.25 Earthing Cables

Earthing cables between equipment and grounding bus bars shall be minimum size 70 mm 2 stranded
conductors copper/copper strip, rated at 300 volts. All hinged doors shall be earthed through flexible
earthing braid. Signal and Safety earthing shall be provided separately.

1.5.1.26 Alarms

Following Visual indications/display such as LEDs, LCDs or a combination of both shall be provided to
indicate:

Functional Indications for local monitoring:

a) Mains available
b) DCPS/SMPSs in Float charge Mode
c) DCPS/SMPSs in Boost Charge Mode

Alarm Indication for local monitoring:

a) Load Voltage High /Low

b) DCPS module/SMPS fail
c) Mains out of range
d) System Over Load
e) Mains “ON”/Battery Discharge
f) Battery fail/isolated

All the protections/alarms shall be within tolerance of 0.25V in case of DC voltage, 1% in case of DC
current and ± 5V for AC voltage
Rev-02
 Alarm Indication for remote monitoring:
a) Input AC mains supply fail alarm
b) Battery low voltage (Pre cut off) alarm
c) DCPS module fail

Potential free Contacts in two numbers for each of the above remote monitoring alarms (one for remote
alarm interfaced through communication equipments and one redundant for local monitoring at suitable
location) shall be provided. All these potential free contacts are to be wired and terminated at the suitable
location for interfacing purpose.

1.5.1.27 Digital Meters/Display Unit

There shall be provision to monitor the following parameters through digital meters or digital display units:

(a) Input AC voltage.

(b) Out put DC voltage
(c) Output DC current of charger
(d) Battery current
(e) Load current.

The Digital display of meters or LCD based display unit shall be with minimum 31/2 digital display of height
12mm and shall have accuracy 1.5% or better.

1.5.2 Cabling & Enclosure Requirements

The contractor shall supply, install and commission all power cables, control cables, network interface
cables and associated hardware (lugs, glands, cable termination boxes etc.) as required for all equipment.
The contractor shall be responsible for Cable laying and termination at both ends of the cable. The
Contractor shall also be responsible for termination of feeder cables at contractor’s equipment end including
supply of suitable lugs, glands, terminal blocks & if necessary cable termination boxes etc. All cabling,
wiring, and interconnections shall be installed in accordance with the following requirements.

1.5.2.1 Power Cables

All external power cables shall be stranded Aluminium conductor, armoured XLPE/PVC insulated and
sheathed, 1100V grade as per IS 1554 Part-I.

1.5.2.2 Enclosure/Panel Earthing

Each enclosure shall include suitable earth networks within the enclosure. Earth network shall be a copper
bus bar, braid or cable inside enclosures.

The safety earth network shall terminate at two/more studs for connecting with the earthing grid. Safety
earthing cables between equipment and enclosure grounding bus bars shall be minimum size 6 sq. mm,
stranded copper conductors, rated at 300 volts. All hinged doors (if provided) shall be earthed through
flexible earthing braid.

For all enclosures requiring AC input power, the green earthing wire from the AC input shall be wired to the
safety earthing stud. The Contractor shall provide all required cabling between enclosures for earthing. The
contractor shall connect safety and signal earths (as applicable) of each enclosure to the Employer provided
nearest earth grid/earth riser through suitable 50X6 sq. mm. GI strips or suitably sized copper cable.

Rev-02
The signal earthing network shall terminate at a separate stud connection, isolated from safety ground. The
stud connection shall be sized for an external earthing cable equipped with a suitable lug.

All earthing connections to equipment shall be made directly to each equipment chassis via earthing lug and
star washer. Use of the enclosure frame, skins, or chassis mounting hardware for the earthing network is not
acceptable.

1.5.3 Temperature Compensation for Battery

There shall be provision for monitoring the temperature of battery and consequent arrangement for
Automatic temperature compensation of the SMPS output voltage to match the battery temperature
dependent charge characteristics. The output voltage of the rectifier in Float/Charge operation shall decrease
or increase at the rate of 72 mV (3mV/cell, 24 cell battery) per degree increase or decrease in temperature
over the set voltage or as may be recommended by the VRLA Battery supplier. A tolerance of +/- 5mV may
be acceptable over the specified rate of 72 mV/degree C. The output voltage shall decrease till the open
circuit voltage of the battery is reached. The open circuit voltage range shall be settable between 2.1V/cell
to 2.2V/cell. The increase in output voltage due to decrease in temperature has been taken care of by the
tripping of the unit due to output voltage high (57V) protection. Failure of temperature compensation circuit
including sensors shall create an alarm and shall not lead to abnormal change in output voltage. The nominal
distance between the battery & DCPS system may be 20 metres. The Contractor shall provide the necessary
sensor and cord for the purpose with DCPS system to sense the Battery temperature.

FIG.: CONCEPTUAL CONFIGURATION OF DC POWER SUPPLY (DCPS) SYSTEM (For Field

Sites Locations)

SOURCE SOURCE ‘B’

‘A’ (3-PH AC)
(3-PH AC)

4-P

CLASS ‘B’ CLASS ‘B’

& ‘C’ SPDs & ‘C’ SPDs

INPUT SUPPLY +v -ve MC

AUTO CHANGE-OVER e Feeder
SCHEME WITH HVD SMPS Modules #1
PROTECTION
Switc Feeder
#2
-ve
1
+v Feeder
e
#3
Feeder
-ve #4
2
+v MC
e
NEUTRAL (N)

Batter Feeder
PHASE (PH)

#10

N+ -ve
2 +v
e Eart

Rev-02
1.5.4 Battery Requirements

1.5.4.1 Valve Regulated Lead Acid (VRLA) maintenance free Battery

The contractor shall supply Valve Regulated Lead Acid (VRLA) maintenance free Battery. Each battery set
shall have sufficient capacity to maintain output at full rated load as indicated in BOQ in Appendix. The
battery shall be capable of being recharged to 90% State of Charge (SOC) from the fully discharged
condition (1.75V/cell) within 10 hrs. In all cases, the battery is normally not allowed to discharge beyond
80% of rated capacity (80% DOD) at 10 hours rate of discharge.

The supplier, supplying the cells/batteries as per this document shall be responsible to replace/repair free of
charge, the battery/cell becoming faulty, owing to defective workmanship or material as per the provisions
of the bid document

1.5.4.2 Containers
The container material shall have chemical and electro-chemical compatibility and shall be acid resistant.
The material shall meet all the requirements of VRLA batteries and be consistent with the life of battery.
The container shall be fire retardant and shall have an Oxygen Index of at least 28%. The porosity of the
container shall be such as not to allow any gases to escape except from the regulation valve. The tensile
strength of the material of the container shall be such as to handle the internal cell pressure of the cells in the
worst working condition. Cell shall not show any deformity or bulge on the sides under all working
conditions. The container shall be capable of withstanding the rigours of transport, storage and handling.
The containers shall be enclosed in a steel tray.

1.5.4.3 Pressure Regulation Valve

Each cell shall be provided with a pressure regulation valve. The valve shall be self re-sealable and flame
retardant. The valve unit shall be such that it cannot be opened without a proper tool. The valve shall be
capable to withstand the internal cell pressure specified by the manufacturer.

1.5.4.4 Flame Arrestors

Each cell shall be equipped with a Flame Arrestor to defuse the Hydrogen gas escaped during charge and
discharge. Material of the flame arrestor shall not affect the performance of the cell.

1.5.4.5 Battery Bank Stand

All batteries shall be mounted in a suitable metallic stand/frame. The frame shall be properly painted with
the acid resistant paint. The suitable insulation shall be provided between stand/frame and floor to avoid the
grounding of the frame/stand.

1.5.4.6 Capacity Requirements

When the battery is discharged at 10 hour rate, it shall deliver 80% of C (rated capacity, corrected at
27ºCelcius) before any of the cells in the battery bank reaches 1.85V/cell.

All the cells in a battery shall be designed for continuous float operation at the specified float voltage
throughout the life. Float voltage of each cell in the string shall be within the average float voltage/cell
+0.05V band.

The capacity (corrected at 27ºCelcius) shall also not be less than C and not more than 120% of C before any
cell in the battery bank reaches 1.75V/cell. The battery voltage shall not be less than the following values,
when a fully charged battery is put to discharge at C/10 rate:

(a) After Six minutes of discharge : 1.98V/cell

Rev-02
 (b) After Six hours of discharge : 1.92V/cell
(c) After 8 hours of discharge : 1.85V/cell
(d) After 10 hours of discharge : 1.75V/cell

Loss in capacity during storage at an average ambient temperature of 35º Celsius for a period of 6 months
shall not be more than 60% and the cell/battery shall achieve 85% of its rated capacity within 3
charge/discharge cycles and full rated capacity within 5 cycles, after the storage period of 6 months. Voltage
of each cell in the battery set shall be within +0.05V of the average voltage throughout the storage period.
Ampere hour efficiency shall be better than 90% and watt hour efficiency shall be better than 80%.

1.5.4.7 Expected Battery Life

The battery shall be capable of giving more than 1200 charge/discharge cycles at 80% Depth of discharge
(DOD) at an average temperature of 27º Celsius. DOD (Depth of Discharge) is defined as the ratio of the
quantity of electricity (in Ampere-hour) removed from a cell or battery on discharge to its rated capacity.
The battery sets shall have a minimum expected operational life of 5 years at normal operating conditions or
1200 charge/discharge cycles (whichever is early).

1.5.4.8 Routine Maintenance of Battery system

For routine maintenance of battery system, the contractor shall supply one set of following tools:
a. Torque wrench.
b. Tool for opening /closing of pressure regulation valve of battery.

1.5.4.9 Testing requirements

The Contractor shall submit type test reports for the battery for the same make, model & rating as offered as
per the IEC 60896 or equivalent IS/EN/BS/TEC standards. In the event, the type test reports for exact rating
is not available, the Contractor shall submit type test reports for higher rating Battery.

1.5.4.10 List of Type Tests

The type testing shall be conducted on the following equipment

(a) DCPS
(b) Battery System

1.5.4.10.1 Type testing of DCPS

The test reports for Immunity, Emission and safety must be in accordance with relevant IEC/CISPR
standards shall be submitted. The Contractor shall submit the DCPS type test reports of earlier conducted
tests on the same make, model, type & rating which shall include the following tests listed in Table A.
Table A
Type Tests on DCPS
1 Surge immunity (Level 4- as per IEC 61000-4-5)
2 Electrical Fast Transients/Burst (Level 4 – as per IEC 61000-4-4)
3 Electrostatic Discharge (Level 4 – as per IEC 61000-4-2)
4 Radiated Electromagnetic Field (Level 3 – as per IEC 61000-4-3)
Conducted disturbances induced by radio-frequency field (Level 3 – as per IEC
5
61000-4-6)
6 Damped oscillatory magnetic field (Level 3 – as per IEC 61000-4-10)

Rev-02
 Table A
Type Tests on DCPS
Voltage dips, short interruptions and voltage variations (Level 2 – as per IEC
7 61000-4-11)
8 Conducted Emission (Level - Class A, Group 1 as per IEC CISPR 11)
9 Radiated Emission (Level - Class A, Group 1 as per IEC CISPR 11)
10 Safety Tests (as per IEC 60950)

15.4.10.2 Testing Requirements of Battery

Table B
List of tests for VRLA battery
Type Test
Sl.
Test As per IEC FAT SAT
No.
60896
√ √ √
1. Verification of marking
- Visual observation
- Dimensional inspection
- Polarity checking
Capacity test √ √ √
2.
3. Suitability for floating battery operation √
4. Endurance in discharge/charge cycles √

5. Charge Retention √
6. Short-circuit current and internal resistance √
7. Mechanical Tests √
-Vibration Test
(procedure as per IEC 60068-2-6)
- Free fall Test
(procedure as per IEC 60068-2-32)
NOTE :
The batteries shall meet the general requirements as per IEC 60896 or equivalent.

1.5.4.11 Factory Acceptance Tests

1.5.4.11.1 FAT/SAT of DCPS

The factory/site tests to be carried out on DCPS system/module in the factory and site are listed
respectively in Table C below.

Table C
Lists of tests for FAT/SAT of DCPS
S.No. Test FAT SAT
Tests on DCPS System
1. Mechanical & Visual Check Tests √ √
Rev-02
 Table C
Lists of tests for FAT/SAT of DCPS
S.No. Test FAT SAT
2. Insulation Test. √
3. High Voltage Withstand Test √
4. Switch On Test √ √
5. DCPS Low voltage & High voltage limits check Test √ √
6. Pre-alarm test for Battery Voltage Low √ √
7. Battery Low Voltage Disconnect Level Test √ √
8. AC Input Low and High voltage limits check Test √
9. Rectifier Fail Alarm Test √ √
10. Voltage Regulation Test √
11. Current Sharing Test √
12. Total Output Power Test √ √
13. Hot Plug In Test ( if applicable ) √ √
14. Calibration & Parameter settings √ √
15. Automatic Float cum Boost Charge Mode Change Over √ √
Test
16. Battery Path Current Limiting Test √ √
17. Battery Charging and full load Current Test √ √
18. Total Harmonic distortion Test √
19. Burn in Test at 50 ° C (for 8 hrs duration) √
Tests on SMPS module
20 Mechanical & Visual Check Test √
21 Module-On Test √
22 Input low/high voltage cut-off test √
23 Voltage Drop Test √
24 Voltage Regulation Test √
25 Power Output & Current Limit Test √
26 DC High Voltage Test √
27 O/P Voltage Ripple Test √
28 Psophometric Noise Test √
29 Efficiency Test √
30 Power Factor √
31. Input Current Limit √
32. Input AC Frequency Range Test √
33. Rectifier Dynamic Response √
34. Output Short Circuit Test √
35. Hold up Time Test √

---------------------------------------------End of this Section-----------------------------------------

Rev-02