DAKSHIN HARYANA BIJLI VITRAN NIGAM

TECHNICAL Specification No. S- S 9 I) D"!) - /17

TECH N ICALSP Eel FICA TI 0 N

FOR

NON SEALED TYPE 11 KV CLASS DISTRIBUTION

TRANSFORMERS OF 200~400~630& 990 KV A
CAPACITIES

VOLUME- A: TECHNICAL
SPECIFICATIONS VOLUME- B :
TECHNICAL DATA SHFETS

Office of
the:

Chief Engineer (PD&C),

DHBVN, Vidyut :-Jagar,
HISAR-
125005(HAR Y A:\A).

Month of Issue: July, 2006

DAKSHIN HARYANA BIJLI VITRAN NIGAM

TECHNICAL SPECIFICATIONS
FOR OUTDOOR NON SEALED
TYPE
11 Kv CLASS DISTRIBUTION
TRANSFORMERS OF 200,400,
. 630
& 990 KVA CAPACITIES.

VOLUME
'A'
 TECHNICAL SPECIFICATIONS FOR 11 kV
CLASS DISTRIBUTION TRANSFORMERS

INDEX_
X
6
SR.NO
DESCRIPTION
Documentation
Climatic
StandardsAssurance
Tests
Scope.
General
Packing
Inspection
Principal
Quality &Conditions
technical
Parameters
forwarding
----_J
Plan ,
Requirements
I rAGE NO. I
I --
TECHNICAL SPECIFICATIONS FOR OUTDOOR NON SEALED TYPE
THREE PHASE llKV /433-250V DISTRIBUTION TRANSFORMERS OF
200,400, 630
& 990'KV A CAPACITIES.

1. SCOPE:

This standard covers oil - immersed, naturally air cooled, double wound,

non sealed, three-phase, 50Hz, outdoor type,

aluminium wound distribution transfonners of capacities of

200,400, 630 & 990 KV A for use on earthed-neutral electric distribution

system with nominal system voltages of 11 kV neutral effectively

earthed. Any other paI1S not specifically mentioned in this

speci fication, but otherwise required for proper [J.nctioning of the

equipment, should be included by the tender in this offer.

2. ST ANDARDS :

14.2 T1le transformer shall conform in all respect to IS, 1180-1981 and IS:

2026-1977 except where specified otherwise. Equipment meering any

other authoritative standard which ensures an equal or better quality than the

standard mentioned above will also be acceptable. In such cases the copy
of standards

(English version) adopted should be enclosed with the tender.

3. CLIMATIC CONDITION:

i) Maximum temperature

ii) MinimUlTI ten1pcrature

i) Relative humidity

a) Maximum 100%

b) Minimum 26%

ii) Isoceraunic level 45

v) A verage number of rainy days per year Nearly 120 days

vi) Average annual rainfall 900mm

i) A verage number of dust stonns 35

days per annum

viii) Altitude BeIO\~,,'1000 Mrs.

ar.f")\c

mean sca level.

 ix) Maximum temp in the shade 45°C xi)
x) Maximum wind pressure 195 kg/m2

1.0 PRINCIPAL PARAMETERS

4. I TYPE & RATING:

The transfonner shall have core type construction, be ON AN cooled

as mentioned below and shall be suitable for outdoor service as

step-down transfonner. The rating & electrical characteristic of the

transfor!:ler shall be as follows:-
Connection
Sr.No.
Rated
No. of(off
Frequency
Vector
Tape
.Rated
1.
Item
HT
phases
group
Continuous
LT HT
LT
voltage
Load)
capacity KV A
voltage Specification
4. 200,400,630 & 990 KV A
standard rating shall be.

11 kV

433-250V
50 Hz
3

Delta

Star(Neutral brought out)

Dy-II

No taps are required for

200KV A T/Fs & for other

taps shall be
10. Type of cooling provided +3%, 0-3%, -6%

WINDING:

The primary winding shall be connected in delta and the secondary

winding in star (Vector group Dy- 11), so as to produce a positive

displacement of 30° from the primary to the secondary vectors of the

same phase. The neutral 6 f
the secondary winding shall be brought out to a separate insulated
terminal. Transformer of 200 KV A shall be Aluminium wound and sizes
above 200 KVA
 shall be copper wound. The current density for Aluminium wound transfonner
shall be limited to 1.5 A/mm sq. and for copper wound transfol1ner shall be
limited to 2.6 A/mm sq.
All the delta leads from HT coils as well as HT line leads of all the T/F's

should be taken out through D.P.C copper \vire of sufficient X-sectional area to
impart desired mechanical strength. The cunent density in these reads should
however not exceed 0.8 AInm2

All HV and LV coil ends shall be provided with crimped lugs. The star
point on LT sides shall be properly sleeved and crimped.
The transfom1er shall be designed and constructed to withstand, without
damage, thel1nal and dynamic effects of an extemal short circuit. The
manufacturer/supplier shall fumish all relevant design data and calculation 111
support of having fulfilled this requirement as stipulated in IS: 2026(part-I).

CORE: The core shall be constructed from cold rolled grain oriented (CRGO-
41) silicon steel laminations of grade-41.Atleast one side of each lamination shall
be coated with a hot oil proof insulating material such as oxide silicate. In case the
manufacturers standard method is different from this, it should be clearly
described. The lamination shall be held rigidly by a steel fraille work, which shall
clamp them together to prevent any variation. The core shall be provided with
lifting lugs for lifting the complete core and coil assembly of the transfonner
without transmitting the stress to the lamination. The flux density should not more
than 1.6 tesla. Laminations used should be free from burrs and rust and the

finally assembled core is free from distortion. The alTangements of connecting

central limb with yoke should be by providing suitable notch in the yoke to
eliminate the cross grain effect. The yoke of the lamination should be in single
piece instead of pieces. The supporting frame work of the core shall be so
designed as to avoid the presence of pockets which would prevent complete
emptying if the tank through the grain value or cause trapping of air during filling.
Bolts should not be used through the core for fastening the laminations; instead
fastening should be done by clamping using clamping bolts. The core shall be so
insulated that there is no possibility of contact between edges and the clamp bolt.
Core shall be of robust design and securely fastened to the tank and capable of
withstanding any shocks to which it may be subjected to during lifting, transport,
installation and service.
/
Bidder can offer transfomler made of other superior (Low Loss) for material

and they should fumish design details in their bid. Successful bidders should

submit requite type test cel1ificates after issue of P.O. but before material offered

for inspection.
4.2 TEMPERATURE RISE:

The temperature rise shall not exceed the limit of 50°c (measured by

resistance) for transformer \yindings·& 40°c measured by (themlometer) of top

oil when tested in acccdance with IS:2026-1977. Hot spot temperature shall not

exceed 95°c when calculated on an annual \\'eighted average temperature of 35°c

as per IS:2026.
4.3 LOSSES AND VALUES:

4.3.1 The no load and load-losses shall not exceed the value given in the following
table:-

KVA· 750
1800
1000load losses(fixed
400
No Load lossesC(Watts)
7000
5000
11000
3135
75 degree at

The above losses are maximum allowable and there would not be any positive

tolerance. Bids with higher losses then aboye specified values would be treated as

non-responsIve.

4.3.1 IMPEDANCE:

The percentage impedance at 75° C shall be 4.5 % subject to a tolerance

as per IS: 2026.overflux shall be limited to 1.6 tesla at full load and nOffilal

frequency and voltage.

4.4 NO LOAD CURRENT AND OVER FLUXING

No load current at 100% voltage shall not be more than of the full load

current & shall be subjected to ISS tolerance. r\o load current at 12.5 % over

voltage shall not be exceed 4% for 200 KV A & for above 200 KV A 5% over

nuxing & Flux density shall be limited to 12.5 & 1.6 Tesla at no load at normal

frequency & voltage. The tenderer shall submit necessary design data in the spot
 2.0 GENERAL TECHNICAL REQUIREMENTS:
5.1 COOLING:

All transfoffi1er shall be capable of giving a continuous output without

exceeding the specified temperature rise.

5.2 TRANSFORi'\1ER OIL :

The transfon11er oil shall comply with the requirement of IS:335

specification for insulating oil for transfom1er & switchgear (low viscosity type)
The transfonner oil used shall also comply with the requirement of
specification, as below:-
S.No. Characteristics Requirements
I. Appearancf' Oil shall be clear & transparent &
free from suspended meter or
sediments.

2. Density(max) 0.89 g/cm3 at 27°c

3. ~inematic viscosity(max) 27 Cst at n° c

4. Interfacial Tension at 27°C (min) 0.04 N/M

5. Flash point (min)

6. Pour point (max)
7. Neutralization value

i)Acidity(max) 0.3MglKvh
ii)Inorganic acidity Nil
8. Corrosive sulphur Non-Corrosive
9. Electric strength breakdown Voltage (Min)
a) New unfiltered oil as 30KVA(rms)
;oeceivedcondition.

b) After treatment 60 KV A(n11s)

10. Dielectric dissipation Factor 0.002
(tan delta) at 90°c(max)
II. Water content (Max) 35 PPM
12. Specific Resistance (Min)
a) 35xl212 Ohm cm

b) 1500xl012 Ohm cm

13 Oxidation Stability mg. KOH/g(Max)

a) Neutralization value after 0.20 mg/KOH/g

Oxid(lf::ion (Max)
b) Total sludge after 0.02% by \veight
2.0 GENERAL TECHNICAL REQUIREMENTS:
5.1 COOLING:

All transformer shall be capable of giving a continuous output without

exceeding the specified temperature rise.

5.2 TRANSFORMER OIL :

The transfoffi1er oil shall comply with the requirement of IS:335

specification for insulating oil for transformer & switchgear (low viscosity type)

The transfoffi1er oil used shaH also comply with the requirement of

specification, as below:-
S.No. Characteristics Requirements
1. Appearance Oil shall be clear & transparent &
free from suspended meter or
sediments.

2. Density(max) 0.89 g1cm3 at 27°c

3. Kinematic viscosity(max) 27 Cst at nOc

4. Interfacial Tension at 27°C (min) 0.04 NIM

5. Flash point (min)

6. Pour point (Illax)

7. Neutralization value

i)Acidity(max) 0.3MglKoh

ii)lnorganic acidity ~il

8. Corrosive sulphur Non-Corrosive
9. Electric strength breakdown Voltage (Min)

a) New unfiltered oil as 30KVA(rms)

received condition.

b) After treatment 60 KVA(rms)

10. Dielectric dissipation Factor 0.002

(tan delta) at 90°c(max)

11. Water content (Max) 35 PPM
12. Specific Resistance (Min)

a) At 90°C 35xl212 Ohm cm

b) At nOc 1500xlOl2 0lm1 cm

13 Oxidation Stability mg. KOH/g(Max)

a) Neutralization value after 0.20 mg/KOH/g

Oxidatyion (Max)

b) Total sludge after 0.02% by \\eight

 1. Aging characteristics after accelerated aging
(open breaker method with copper catalyst).

(a) Resistivity at 27°C (Min) 1.18t02.2xl012 cm

(b) Resistivity at 90°C (Min) 1.12toO.16xl012 cm

(c) Dielectric loss factor tan 0.1 to 0.15

delta at 90°C (Max)

(d) Total acidity mg. 0.6

KOH/g(Max)

(e) Sludge content after ageing 0.3

%max.

15. Presence of Oxidation in-hibitor Absent. The important characteristics 0 f the

transfom1er oil after it is filled in the transformer (within 8 months of filling) shall be as
follows :-

Sr.No. Characteristics Requirements

1. Electric Strength 30 KV (Min.)
2. Dielectric dissipation factor tan 0.01 Max.

delta at 90°C (Max)

3. Specific Resistance (Resishvity)

a) At nOc (Ohm- cm) Above 10xl012 Ohm cm

4. Flash point PM (closed) 140°C (Min)

5. Interfacial Tension at 27°C (min) 0.03 N/M or more.

6. Neutralization value (Total Acidity) 0.05 Mg or KOH/g or less

7. Water content PPM 35 Max.

All tests to verify the characteristics mentioned as above shall be carried out
in accordance with ISS:335.

5.3 FITTINGS:

1 Two earthing tem1inals with lugs.

2. 3 Nos. 11 KV porcelain bushings confonning to ISS:3347 Part-III of the latest

version thereof with brass studs fitted with single gap arcing horns.

3. 4 Nos. 0.433 KV porcelain bushings con filming to IS-3347, Part-lor the latest

version thereof with brass studs fitted with single gap arcing horns (Neutral to be

made available on LV side).

1. Oil level gauge to be provided on the conservator tank indicating three positions of oil
marked as follo\\s:

Minimum
 Nornlal
Maximum

5. One set of lifting lugs and pulling lugs.

6. Rating and tenninal marking plates.

7. Dehydration breather (with oil seal) of \veather proof design with minimum silica gel
as under:-

i) for 200 KV A 400 gms.

ii) for 400 KVA

. 400 gms .
ii i) for 630 KVA 600 gms.

iv) for 990 KVA 1000 gms.

8. Siphon opening should be provided in each T/F. in place of drain valve.

9. 1 No. filter valve with plug 25mm2 dia (Minimum) at the top for filtration.

10. One 4" dial type themlometer.

II. One thernl0meter pocket.

12. An air release plug on the top cover of main tank for release of tapped air.

13. Conservator tank along with the drain plug and a filling hole 25mm dla each with the

cap.
14. Base channels.

2. Explosive vent.

3. Externally operated circuit tap changing s\\'itch with a locking device.

4. Plain Rollers.

5. Bimetallic telminal connectors on the HV I LV bushings.

6. Radiators - As per requirements.

5.4. CONSERVATORS:
Provision of conservator on all the transfonllers is obligatory. When a conservator is
fitted, the oil gauge and the breathing device shall be fixed to the conservator which
shall also be provided with a drain plug and filling hole with a cover. In addition,
the cover of the main tank shall be provided with an release plug to enable release
of air trapped within the main tank, unless the conservator is also located as to
eliminate the possibility of air being trapped within the main tank.

The inside diameter of the pipe connecting the conservator to the main tank shall
be within 20mm2 to 50mm2 and it should project into the conservator in such a way
that its end is approximately 20mm anO"e the bottom of conservator so as to create a
sump for collection of impurities. The conservator should have a capacity of minimum
10% of the total oil in the transfonllers and while supplying the transfonners, the
conservator should contain minimum 3 % of the total quantity in the transformers
corresponding to 5°C. Breather pipe should be connested at the top of the
conscnator tank \\lith two bends at right angles.
 5.5. TANK:

Transfonner tanks shall be of robust constmction in accordance with the best

engineering practice. The main tank of the transforn1er shall be made of good quality
steel.

The tank will be valid (V shape welding fillet) inside of tank two outside welding

of tank to bear more pressure to avoid bursting.

The thickness of the top and bottom plates shall not be less than 6 mm and

thickness for the side plates shall not be less than 4 mm for transformer. The internal

clearance of the tank shall be such that it shall facilitate easy lifting of core with coils

from the tank out dismantling L T bushing etc. The tank shall be capable of withst~nding

a pressure of +/- 1 Kg. /cm2 without defoffi1ation. Suitable stiffeners shall be orovided ~o

make the tank sturdy.

RADIATORS:
These shall be made of ERW tubes with minimum side thickness of 18 SWG.

These tubes should be used in a vertical fonnation without any bending anc properly

welded on both ends to common headers. These radiators should be individually test for

leakage and pressure tests etc. before welding with the main tank.
5.6 BUSHINGS:

The Bushings shall confonn to IS-2099-1973 "Specification for High Voltage

porcelain bushings". The Bushing rods and nuts shall be made of brass. Creepage s1:311
not be less than 25111m/ kV at 12 kV.

The dimensions of bushings of the following voltage classes shall confonn to

Indian Standards mentioned against them.

I '. T 1. r-'l1 I ..•.....• __. ~. , - -

v uHage ~lass .t'or rorcelam parts tor metal parts.

Upto 1.1 kV Bushings IS:334 (Part-I Sec-I) 1965 IS:3347 (Part-I Sec-I) 1967

12 kV Bushings IS:334 7/(Part-III See-I) IS:334 7{Part-III Sec-2)

1972 1967

The transfonners shall be provided with bimetallic connectors on bushings both

on HV & LV side.

1.0 WINDING INSULATION:

Double paper covering shall be used for winding insulation both for HV & LV

windings. Electrical grade epoxy coated insulated paper shall be used for inter-layer
 be provided between HV & LV winding. Angle shaped and rings made from pre-
compressed board shall be used between end coil and the core.

1.0 CLEARANCES:
a) Following ri1inimum clearances shall be maintained:-
Between HV & LV winding in oil. 10mm
Between Yoke & Tank Button. 40mm

Between BV winding & Tank wall. 30mm

(between inside surface of the tank & outside edge
of the windings)

Between sections of HV winding. 06mm

Between yoke & inside of top cover. 100mm

a) Following minimum electrical clearances shall he maintained:-

earth.
VoltagePhase
phaseto 55mm
Clearance
Medium
205mm
255mm
75mm
I
Air
Air

The transfo1111ershall be adequately insulated and suitably designed :lS to be

capable of continuous operation on any particular tap at the rated KVA provided that the
voltage does not vary by more than +/- 10% of voltage corre~ponding to the tapping.

5.9 SEALING GASKETS:

All sealing washers /gaskets shall be made of oil and heat resistance nitrate
bonded cork type RC-70C gaskets. Gaskets make of natural rubber or cork sheet are not
permissible. The minimum thickness of gaskets shall not be less than 10mm.

5.10 INSULATION RESISTANCE:

The following shall be minimum resistance resistance values in Mega Ohm
between winding and earth when the transfOlmer is filled with oil and insulated resistance
in Mega 01U11sbetween winding to earth
30°C 50°C

11000V(HV) 800 400 200 100 50

433V (LV) 400 200 100 50 25

 The IR values will be measured with 2500 Volts, Meggar, preferably motorized
and of some good standard manufacturer (such as MIS Evershed and Vignole make).

5.11 OVERLOADING CAPACITY:

The over loading capacity of the transfoffiler shall be as per IS:6600.

5.12 UNBALANCE CURRENT:

The value of unbalance CUlTent indicated, by the ammeter as shown in the test
alTangement in enclosed sketch Fig. 1 shall not be more than 2% of the full load cunenl.
5.13 OFF CIRCUIT TAPS:

The tap changing switch shall be located at a convenient position so that it can be
conveniently operated without any undue effort. The switch handle shall be provided
with a locking alTangement along with a tap position indicator, thus enabling the switch
to be locked in position.

5.14 FINISlI :

The exterior of the transfoffiler tank and other felTous fittings shall be thoroughly
cleaned scrapped and given a priming coat and two finishing coats of durable oil and
weather resisting paint or enamel. The colour of the finishing coats shall be dark
admirably grey confoffiling to No. 632 ofIS:5-1961 "Colours for Ready Mixed - Paints
(Second revision).

5.15 RATING AND TERMINAL MARKING PLATES:

Each transformer shall be provided within non-detachable rating and terminal

marking plates of weather proof material, fitted in a visible position and showing the

complete infoDnation as given in relevant IS for transformers including the following

details:-

(1) P.O.No. and date.

(2) Date of inspection.
(3) Property ofDHBVNL.

\
5.16 MOUNTING ARRANGEMENTS:

For transfonners upto 200 KV A the mounting alTangement shall be as per

enclosed sketch Fig. 2.
For higher sizes, the transfoffilers shall be provided with bi-directional flat rollers
suitable for use on I (JOOmm gauge track.
..

5.17 TEST VOLTAGES:

Transfomler shall be capable of withstanding the power frequency and impulse test

voltagt;: prescribed below:-

Nominal 11 kV n11S.

Highest 12 kV filS.

Impulse 75 KVP

Power frequency system test voltage = 28 kV rins.

6. TESTS:
6.1 The design of transfomler being offered shall be duly type tested as per relevant

standard mentioned under Clause-2. In case the equipment of the type and design offered

has already been type tested in an independent test laboratory. the tenderer shall furnish

four sets of type tests reports along the offer. However, short circuit test, temperature rise

test and impulse test shall be canied out on one transfomler of each type, compulsorily.

The 'price of these tests shall be included in the price of transfomler in Bid Pr~posal
Sheets. However, once a type test is done, it would be valid for next three years on the

date of opening of bid provided the specification unaltered. In case any manufacturer ha~

already obtained a test certificate \v;lh similar design parameters within three years of the

bid, such certificates would be acceptable.

Once a type test is done, the rnanufacturer would ensure that the material

manufactured / 'supplied to DHBVNL would confoml to all parameters recorded for the

transfomler which was type tested. The purchaser reseryes the right to demand repetition

of some or all the type tests in the presence of purchaser's representative. For this
purpose the tenderer may quote unit rates for carrying out each type test. These prices

shall be taken into consideration for bid evaluation. For any change in the design / type

already type tested and the design type offered against this specifkation the purchaser

reserves the right to demand repetition of tests without any extra cost. In case the

equipment have not been type tested earlier, all the type tests as per relevant standards

shall be carried out by the successful tenderer in the presence of purchaser's

representative without any extra cost.

6.2 ACCEPTANCE AND ROUTINE TESTS:
6.2.1 All acceptance and routine tests as stipulated in the relevant standards shall be

catTied out by the supplier in the presence of purchaser's representative.

1.0.0 Immediately after finalization of the programmed of type / acceptance / routine

testing, the supplier shall give fifteen days advance intimation to the purchaser, to

enable him to depute his representative for witnessing the tests.

7. A) TEST AND INSPECTION:

All tests and inspection shall be made at place of manufacture unless other wise especially
agreed upon by the manufacture and the purchaser. The manufacturer shall afford the
inspector representing the purchaser all reasonable testing facilities, without charge to satisfy
him that the material offered for inspection is in accordance with the requisite specifications.

The bidder shall give 15 days advance infomlation to enable the purchaser to depute his
representative for witnessing rou~ine tests and acceptance thereof.

The manufacturer shall provide all services to establish and maintain quality of workman ship
at his works and that of his sub-contactors to ensure the mechanical/electrical perfonnance of
components, compliance with drawing, identification and 'acceptability of all materials, parts
and equipment as per latest quality standards ofISa 9001 :2000.

Nigam intends to purchase only High Quality material. For this purpose stringent testing of the
material shall be done as per procedure given below:-

1. On offer of inspection for distribution transformers by the firm, a team on Nigam's

officials may go to the Works site the Manufacturer to pick up samples from offered lot
and may send the same for testing as per GTPlNigam's Technical Specifications at
some Central Govt. Testing Lab. or at Nigam's Transfomler Workshop at Nigam's cC'st.

2. At the same time after receipt of offer for inspection, Inspect~on Agency will be deputed
to inspect 100% of the offered lot.

3. The checking / inspection repol1s received from both the agencies i.e. sample checking
report from Central Govt. Testing Lab. and inspection rep0I1 of inspection agency will
be scrutinized by Office of CE/MM and, if both the reports are found O.K. the dispatch
authorization will be issued to the finn.

4. After the receipt of material in the Stores, the tests for no load and full load losses shall
be carried out on each T/F through post receipt inspection Committee constituted for the
purpose.

5.1 No load losses and full load losses are fixed.

5.2 During post receipt inspection if the losses of any transformer are found more th~n the
prescribed limit given in the technical specification, the transformer(s) shall be got
replaced and in addition the penalty equivalent to the cost of the transfomler supplied
will be charged from the firm for supplying inferior quality material.

6. If during the post receipt inspection the failure rate of Transfomler is more than 10%
(Ten percent) of the lot supplied then the entire lot will be rejected and fiml will not be
rejected and firm will not be entitle for any payment. The payment, if any, made will
have to be refunded back within 10 days of giving such notice of failure to the supplier.

7. Inspection will be conducted every year, for the first 5 year on a 2% sample of the
quantities supplied. Samples will be collected at random to establish that the guaranteed
technical parameters are as per the submitted bid by the supplier. In the case of non-
adherence, the purchaser may take suitable action 011 the supplier including cancellation
of vendor registration and banning further dealings, depending on the gravity of the
deviation. These random inspections may be entrusted to a third party.
 8. If the distribution transfomler rejection rate exceeds 5% of the total supply, the finn will
be automatically blacklisted.

7. B), FAKE INSPECTION CALLS:

All such finn's who after giving inspection call do not put up materials to
Inspecting Officer for inspection due to one or other reason, shall be required to remit the
expenditure on TA & DA of the Inspecting Officer(s) a penalty of Rs. 2000/- giving fake
inspection call.
8. QUALITY ASSURANCE PLAN:

8.1 The 'Tenderer shall invariably fumish following information along with his offer,
failing which his offer shall be liable for rejection. Intonnation shall be
separately given for individual type of equipment offered.
i) Statement giving list of important raw materials, names of sub-suppliers for
the raw materials, list of standards according to which the raw materials are
tested. List of tests nonnally carried out 0;-, raw matelials in the presence of
. tenderer's representative, copies of test certificates.

ii) Inforr:lation and copies of test certificates as (l) abov-:; in respect of

bought out accessories.
iii) List of manufacturing facilities available.

iv) Level of automation achieved and list of areas where manual processing
exists.

a) List of areas in manufacturing process, where stage inspections are

n0l111ally carried out for quality control and details of such tests and
inspections.
vi) Special features provided in the equipment to make it maintenance free.

equipment specified and test plant limitation, if any, vis-a-vis the type,
special acceptance and routine tests specified in the relevant standards.
These limitations shall be very clearly brought out in schedule of
deviations from specified test requirement.
8.2 The successful Bidder shall within 30 days of placement of order submit
following infonnation to the purchaser:
i) List of raw materials as well as bought out accessories and the names of sub-
suppliers selected from those fumished along with offer.
ii) Type test certificates of the raw materials and bought out accessories.
The central excise passes for raw material at the time of routine testing.
 iii) Quality assurance plan (QAP) with hold points for purchaser's inspection. The

quality assurance plan and purchasers hold points shall be discussed between the

purchaser and Bidder before the QAP is finalized.

8.3 The successful tenderer shall submit the routine test certificates of bought out

accessones and central excise phases for raw materialviz oil, copper, aluminium,

conductors insulating materials, core material at the time of routine testing of the full\'

assembled equipment.
9. DOCUMENTATION:

1.0 All drawings shall cunform to International Standards Organization (ISO) 'A',

series of drawi~lgs sheet / Indian Standards Specification IS-G56. All drawings

shall be in ink and suitable for micro filming. All dimensions and data shall be in
SI Units.

2.0 LIST OF DRAWINGS AND DOCUMENTS:

The tenderer shall furnish f0ur sets of following drawings along with his offer:- ,

.a) Gerteral outline and assembly drawings of the equipment.

a) Graphs showi~:g the perfornlance of equipment in regard to magnetization

characteristics.

b) Sectional views showing:

a) General constructional features.

i) The materials / gaskets / sealings used.

ii) The Insulation, the winding arrangements, method of connection of

the primary / secondary winding to the primary / secondary

tenninals etc.

iii) Porcelain used and its dimensions along with the mechanical and
electrical characteristics.

c) Anangement of terminals and details of cOlmection studs provided. d)

Name plate.

e) Schematic drawing.

f) Type test reports in case the equipment has already been type tested.

g) Test reports, literature, pamphlets of the bought out items and raw
material.

9.3 The successful tenderer shall within 15 days of placement of order, submit three

sets of final versions of all the above said drawings for purchaser's appro\'aJ. The

purchaser shall communicate his comments / approval on the drawings to the

supplier within 30 days. The supplier shall, if necessary. modify the dra\\ll1gs and

submit three copies of the modified drawings for pllJ'chaser'~ (,01l11l1f'nr~ An",,·
 receipt of purchaser's approval, the suppliers shall within 15 days, submit 12

prints and two good quality reproducible of the approved drawings for
purchaser's use.
9.4 Six sets of the type test reports, duly approved by the purchaser, shall be
submitted by the supplier for distribution before commencement of supply.
Adequate copies acceptance and routine test certificates, duly approved by the
purchaser, shall accompany the dispatched consignment.
1.0 The manufacturing of the equipment shall be strictly in accordance with the
approved drawings and no deviation shall be pennitted without the written
approval of the purchaser. All manufacturing and fabrication work is connection
with the equipment Plior to the approval of the drawing shall be at the supplier's
risk.

2.0 16 sets of nicely printed and bound volumes of operation, maintenance and
erection manuals in English Language, for each type and rating of equipment
suppiied shall be submitted by the supplier for distribution, prior to the dispatch of
the equipment. The manual shall contain all the drawings and infonnation
required for erection, operation and maintenance of the distribution transfonner.
The manual shall also contain a set of all the approved drawings, type test reports
etc.

9.7 Approval of drawings / work by purchaser shall not relieve the supplier of his
responsibility and liability for ensuring COITectness and conect interpretation of
the drawings for meeting the requirement of the latest version of applicable
standards, rules and codes of practices. The equipment shall confirm in all
respects to high standards engineering, design workmanship and latest revisions
of relevant standards at the time to ordering and purchaser shall have the power to .
reject any work or materials which, in his judgement is not in full accordance
therewith.
10. PACKING AND FORWARDING:

10.1 The equipment shall be packed in crates suitable for vertical/horizontal transport
as the case may be, and suitable to withstand handling during transport and outdoor
storage during transit. The supplier shall be responsible for any damage to the equipment
during transit, due to improper and inadequate packing. The easily damageable material
shall carefully packed and marked with the appropriate caution symbol. Wherever
necessary, proper anangement for lifting, sLlch as lifting hooks etc. shall be provided.
Any material found short inside the packing cases shall be supplied by the supplier
without any extra cost.
10.2 Each consignment shall be accompanied by a detailed packing list containing the
following infonnation :

a) Name of the consignee.

b) Detai Is of consignment.
c) Destination.
 e) Signs showing upper/lower side of the crate. f)
Handling and unpacking instlUctions.
g) Bill of matelial indicating contents of each packing.

10.3 The supplier shall ensure that the packing list and bill of material are approved by
the purchaser before despatch.

11. GUARANTEED TECHNICAL PARTICULARS:

There will not be any negati\'e tolerance on the guaranteed technical

particulars mentioned by the manufacturers i.e. size of tranSfOn1lerS, weight of
transfonller, quantity of oil and core weight ete.
. )\
s~k~ & Design,
for C.E / PD&C, DHBVN, Hisar.

", ,