Volume-II, Section 5A – HTLS Conductor Marsyangdi Corridor 220 kV Transmission Line Project

TECHNICAL SPECIFICATIONS

SECTION-V-A

1.0 Description of High Temperature Low Sag Conductor and its Technical Requirements 1

1.2 Current Carrying Capacity /Ampacity Requirements 1

1.3 Technical Particulars of HTLS Conductor 3

1.4 Sag-Tension Requirements 3

1.5 Workmanship 7

1.6 Joints in Wires 7

1.7 Tolerances 8

1.8 Materials 8

1.9 Standard Length 9

1.10 Evaluation of Ohmic Losses & Differential Price Loading 9

2.0 Tests and Standards 10

2.1 Type Tests 10

2.2 Acceptance Tests 12

2.3 Routine Test 14

2.4 Tests During Manufacture 14

2.5 Testing Expenses 14

2.6 Additional Tests 15

2.7 Sample Batch For Type Testing 15

2.8 Test Reports 16

2.9 Inspection 16

2.10 Test Facilities 16

2.11 Packing 17

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2.12 Verification of Conductor Length 18

2.13 Standards 18

1.0 Tests on Conductor 23

1.1 UTS Test on Stranded Conductor 23

1.2 Corona Extinction Voltage Test 23

1.3 Radio Interference Voltage Test 23

1.4 D.C. Resistance Test on Stranded Conductor 23

1.5 Stress-strain test at elevated temperature 24

1.6 High Temperature endurance & creep test 24

1.7 Sheaves Test 25

1.8 Axial Impact Test 25

1.9 Radial Crush Test 25

1.10 Torsional Ductility Test 25

1.11 Aeolian Vibration Test 25

1.12 Temperature Cycle Test 26

1.13 Heat Resistance test on Aluminium Alloy wire 27

1.14 Bending test on Aluminium clad core wire (if applicable) 27

1.15 Compression test on Aluminium clad wires (if applicable) 27

1.16 Coefficient of linear expansion for core/ core wires 27

1.17 Strand Brittle fracture test (for carbon-fibre composite core only) 27

1.18 Visual and Dimensional Check on Drums 28

1.19 Visual Check for Joints, Scratches etc. 28

1.20 Dimensional Check on Core/ CoreWires and Aluminium/ Aluminium Alloy Wires 28

1.21 Check for Lay-ratios of Various Layers 28

1.22 Galvanising Test 28

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1.23 Aluminum thickness on aluminum clad wires (if applicable) 28

1.24 Torsion and Elongation Tests on Composite Core/ INVAR Core wires 29

1.25 Breaking load test on Aluminium/ Aluminium Alloy &Composite core/ INVAR Corewires
and D.C Resistance test on Aluminium/ Aluminium Alloy wire 29

1.26 Wrap test on Corewires(Applicable for steel/Al clad Steel/invar core only) 29

1.27 Minimum conductivity test on thermal resistant Aluminium alloy wire 30

1.28 Procedure Qualification test on welded Aluminium/ Aluminium Alloy wire. 30

1.29 Ageing Test on Filler (if applicable) 30

1.30 Aluminium conductivity test on Aluminium clad wire (if applicable) 30

1.31 Glass Transition Temperature Test (for carbon-fibrecomposite core only) 30

1.32 Flexural Strength Test (for carbon-fibre composite core only) 30

1.33 Chemical Analysis of Aluminium/Aluminium Alloy and Composite core/INVAR Core

Wires 30

1.34 Chemical Analysis of Zinc 31

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Volume-II, Section 5A – HTLS Conductor Marsyangdi Corridor 220 kV Transmission Line Project

TECHNICAL SPECIFICATIONS

SECTION-V-A

1.0 Description of High Temperature Low Sag Conductor and its Technical
Requirements

1.1 The offered HTLS Conductor shall be capable of providing the maximum
ampacity of 1200 A at a continuous operating conductor temperature not
exceeding the maximum permissible operating temperature for continuous
operation of the offered HTLS Conductor and without exceeding the level of
maximum permissible sag indicated below at Clause 1.2.1

The physical and operating performance requirements of the transmission line

with HTLS conductor are mentioned below. The bidder shall offer HTLS
conductor complying with the specified requirements. The Bidder shall indicate
particulars of the proposed conductor in the relevant GTP schedule of BPS along
with calculations to establish compliance with the specified requirements.

1.2 Current Carrying Capacity /Ampacity Requirements

1.2.1 Each conductor shall be suitable to carry minimum 1200 Amperes of 50 Hz

alternating current under the ambient conditions & maximum conductor sag
specified below while satisfying other specified technical requirements/
parameters: -

Elevation above sea level = 0 m

Ambient température : 45 deg C

Solar Absorption coefficient =0.8

Solar Radiation = 1045 watt/sq.m

Emissivity Constant= 0.45

Wind velocity considering angle between wind & axis of conductor as 90 degrees
= 0.56m/sec

Effective angle of incidence of sun’s rays= 90 deg

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Maximum permissible Conductor sag for 350 m span at steady state conductor
temperature and nil wind corresponding to 50 Hz alternating current of 1200
Amperes per conductor under ambient conditions specified above = 10.36m

The calculations for Ampacity shall be based on IEEE Standard 738-2006 in SI

units. Ratio of AC resistance & DC resistance for HTLS conductor shall be
calculated on the basis of Chapter-2, EPRI AC Transmission Line Reference Book –
200 kV and Above or the formulae indicated as follows :-

Rac = Rdc X ( 1+ 0.00519 X (mr)n X k1 + k2) where,

mr = 0.3544938/(Rdc)½

ifmr< 2.8, then n = 4- 0.0616 + 0.0896 X mr – 0.0513 X(mr)2

ifmr> 2.8 < 5.0, then n = 4+ 0.5363 -0.2949X mr +0.0097 X(mr)2

k1= {cos (90 (d/D)P)}2.35where,

p = 0.7 + 0.11Xmr – 0.04Xmr2+ 0.0094Xmr3

k2=0.15 for single Aluminium layer INVAR type HTLS conductor

= 0.03 for three Aluminium layer INVAR type HTLS conductor

= 0.003 for two or four Aluminium layer INVAR type HTLS conductor

= 0 for composite core type HTLS conductor

where,

D= conductor outer diameter in metres

d = conductor inner diameter in metres

Rdc = dc resistance of conductor at given temperature, ohms/ km

Rac=ac resistance of conductor at given temperature, ohms/ km

The bidder in his bid shall furnish calculations for the ampacity based on the
above for the proposed HTLS conductor.

1.2.2 The design of conductor shall be suitable for operation at a steady state
conductor temperature experienced for a sub conductor AC current flow of 1200
Amperes under the above ambient conditions based on ampacity calculations
mentioned above. The bidder shall also indicate the maximum permissible

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conductor temperature for continuous operation without any deterioration of its

electrical, mechanical & metallurgical properties. In case of INVAR conductor &
metal-matrix composite core conductor, the maximum permissible conductor
temperature for continuous operation shall not be considered more than 210
deg C and in case of carbon fibre composite core conductor, the same shall not
be considered more than 180 deg C. The bidder shall also furnish the maximum
permissible conductor temperature for short term operations including
permissible duration of such short term operation. The UTS of conductor
declared in the GTP shall hold good up to the designed maximum temperature
(i.e. the steady state conductor temperature corresponding to 1200A)

1.3 Technical Particulars of HTLS Conductor

The HTLS conductor shall meet the following minimum requirements:

Overall diameter of complete conductor Not exceeding 28.63 mm and

Not less than 25 mm

Approx. mass of complete conductor Equals to 1621±5%

(kg/km)
kg/km

Direction of lay of outer layer Right Hand

The bidder shall indicate the technical particulars and details of the construction
of the conductor in the relevant schedule of GTP. The bidder shall also guarantee
the DC resistance of conductor at 20 deg C and AC resistance at the calculated
temperature corresponding to 50Hz alternating current flow of 1200 Amperes at
specified ambient conditions (designed maximum temperature).

The bidder shall submit the supporting calculations for the AC resistance at 1200
Amperes and at 615 Amperes indicating details & justifications of values of
temperature coefficient of resistance & DC to AC resistance conversion factor(s)
with due reference to construction / geometry of the conductor.

1.4 Sag-Tension Requirements

1.4.1 The HTLS conductor shall meet the following sag tension requirements for
ruling span of 350meters:

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Particulars Limiting value

Tension at every day condition (32°C, no wind) Not exceeding 25% of

UTS of proposed
conductor

Sag at designed maximum temperature ≤10.36meters

(corresponding to 1200 Amperes and ambient
conditions specified at 1.2.1)

Tension at following wind pressure:-

i) Tension at 32 deg C, full wind (166.8kg/m2) ≤ 6892kg & not

exceeding 70% of UTS
of proposed conductor

The calculations for Sag & tension shall be as described below: -

a) In case of INVAR Conductor: Sag-Tension calculations for INVAR conductor

can be carried out using conventional methodology or by using PLSCAD.

I) Conventional Method: This methodology is illustrated at Annexure-B to the

section. Following values shall be considered for the purpose of sag-tension
calculation: -

i) Modulus of Elasticity of Thermal resistant Al alloy strands: 55 GPa to

61.8 GPa

ii) Modulus of Elasticity of INVAR core strands: 155 GPa

iii) Coefficient of Linear Expansion of Thermal resistant Al. Alloy: 23 X

10-6 /deg C

iv) Coefficient of Linear Expansion of INVAR core strands (max.): 3.7 X

10-6 /deg C

v) Initial temperature in manufacturing conductor- not less than 15

deg C

In case the bidder proposes the coefficient of linear expansion of

INVAR core strands less than 3.7 X 10-6 /deg C, the bidder shall submit
proper justification in the form of test reports, documents, etc. along
with the bid.

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II) PLS CAD Method: Following values shall be considered for the purpose of
sag-tension calculation:-

i) Final values of modulus of elasticity of Aluminium Alloy/ Core

strands, Coefficient of Linear Expansion of Aluminium Alloy/ Core
strands, Stress-Strain coefficients & Creep coefficients of Aluminium
alloy / core strands in the cable data (.wir file) used for calculation of
sag in PLSCAD shall be based on either of the following :-

a) Existing standard files on PLS website

b) A file derived from existing standard file for conductor of
equivalent/ near equivalent stranding.
c) A file derived from type test conducted on conductor of same
stranding.

However, value of Final values of modulus of elasticity of Aluminium

Alloy/ Core strands, Coefficient of Linear Expansion of Aluminium
Alloy/ Core strands shall be within the limits defined under I) above

In each of the above cases, proper justification in the form of test

reports/ calculations/ print out of ‘.wir’ file as available on PLS
website, etc. shall be required to be submitted by the bidder
alongwith the bid.

ii) PLSCAD Sagging criteria/conditions shall be based on the sag

tension limits specified above at Clause 1.4.1and shall be carried out in
a manner that the above mentioned sag-tension limits are met in
“After Creep” as well as in “After Load” condition.

b) In case of composite core conductor: Sag-Tension calculations for composite

core conductor can be carried by using PLSCAD. Following values shall be
considered for the purpose of sag-tension calculation: -

i) Final values of modulus of elasticity of Aluminium/ composite core, Coefficient

of Linear Expansion of Aluminium/ composite core, Stress-Strain coefficients
& Creep coefficients of Aluminium/ composite core in the cable data (.wir file)
used for calculation of sag in PLSCAD shall be based on either of the following
:-

a) Existing standard files on PLS website

b) A file derived from existing standard file for conductor of
equivalent/ near equivalent stranding.

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c) A file derived from type test conducted on conductor of

same stranding.

In each of the above cases, proper justification in the form of test

reports/ calculations/ print out of ‘.wir’ file as available on PLS
website, etc. shall be required to be submitted by the bidder along
with the bid.

ii) PLSCAD Sagging criteria/conditions shall be based on the sag tension limits
specified above at Clause 1.4.1and shall be carried out in a manner that the
above mentioned sag-tension limits are met in “After Creep” as well as in
“After Load” condition.

1.4.2 Various conductor parameters (viz. modulus of elasticity, coefficient of linear

expansion, stress-strain and creep, etc.) considered above in the sag tension
calculation shall be verified during detailed engineering based on type tests
conducted.

1.4.3 The bidder shall also furnish sag & tensions under no windfor various
temperatures starting from 0 deg C to designed maximum temperature in steps
of 5 deg C.

1.4.4 After award of the contract, the Supplier shall submit Sag-Tension calculations
corresponding to specified conditions and for the ruling span and also all the
spans as per detailed survey and spans ranging from 100 m to 1100 m in
intervals of 50 m.

1.4.5 Besides above, the Supplier shall also furnish during detailed engineering details
of creep characteristics in respect of the offered type of HTLS conductor based
on laboratory investigations/ experimentation (creep test as per IEE1138 or IEC
61395) conducted on similar type of conductor and shall indicate creep strain
values corresponding to 1 month, 6 month, 1 year, 10 year & 20 year creep at
everyday tension &designed maximum temperature as well as at room
temperature.

1.4.6 The installation & stringing of the offered HTLS conductor shall be carried out by
the transmission line contractor under supervision of the HTLS conductor
supplier.

The supplier shall supervise the stringing at site as per the approved stringing
procedure. The supplier shall prepare stringing charts for the HTLS conductor
showing the initial and final sags and tension for various temperatures and spans
along with equivalent spans on the basis of tower schedule prepared by
transmission line contractor and submit the same for the approval of the
Employer. Site visit for supervision shall be carried out as per instructions of the

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Employer. The supervision/Inspection work in supplier’s scope shall mainly

include inspection as per stringing procedure, proper location of drum site,
installation of stringing blocks/pulley, proper sagging, proper installation of its
fittings & accessories, proper tension as per sag-Tension chart etc. The
supervision shall also include arranging all necessary special tools & tackles
required for stringing of the offered HTLS conductor free of cost.

1.4.7 The above stringing work including installation of its fittings & accessories shall
be supervised by a team of supplier’s engineers / supervisory staff/ workmen
already experienced in stringing work associated with the type of HTLS
conductor being supplied. The bidder shall furnish experience details of the
engineers /supervisory staff proposed to be deployed.

1.4.8 The cost of conductor shall also include supply of one set of all the special tools
& tackles required for stringing of the offered HTLS conductor.

1.5 Workmanship

1.5.1 All the conductor strands shall be smooth, uniform and free from all
imperfections, such as spills and splits, cracks, die marks, scratches, abrasions,
rust etc.

1.5.2 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.

1.6 Joints in Wires

1.6.1 Aluminium/ Aluminium Alloy Wires

1.6.1.1 During stranding, no Aluminium/ Alloywire welds shall be made for the purpose
of achieving the required conductor length.

1.6.1.2 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(s) 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/ Alloywires. 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/Alloywire of the completed conductor. A record
of such joints for each individual length of the conductor shall be maintained by
The Contractor for Employer’s review.

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1.6.1.3 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.

1.6.2 Core Wires

There shall be no joint of any kind in the finished wire entering into the
manufacture of the strand. There shall also be no joints or splices in any length
of the complete stranded core

1.7 Tolerances

Manufacturing tolerances on the dimensions to the extent of one percent (+/-1

%) shall be permitted for individual strands and the complete conductor.

1.8 Materials

The materials used for construction of the conductor shall be such that the
conductor meets the specified technical and performance requirements.

1.8.1 Outer layer

The material of outer layer of HTLS conductor shall be of high temperature

resistant aluminum alloy added with zirconium or any other suitable element(s)
etc. to electrolytic Aluminium or annealed Aluminium (0tempered) having purity
not less than 99.5%and a copper content not exceeding 0.04%.The strands shall
be manufactured through appropriate manufacturing process to ensure
consistent electrical, mechanical and metallurgical properties under continuous
high temperature operation. Bidder shall guarantee the chemical composition in
the schedule GTP of BPS and also furnish description of the manufacturing
process in the Bid.

In case of fully annealed type (0 tempered), Aluminium strands trapezoidal/ Z-

shaped wires shall only be accepted.

1.8.2 Core

The core wire strand(s) shall be of Zinc-5% Aluminium – Mischmetal alloy coated
invarwires/ galvanized invar wires/ Aluminium clad invar wires/composite
materials, etc. and shall have properties conforming to the technical
performance requirements of the finished conductor. Bidder shall furnish
properties and composition of the core wire strand(s) in the schedule GTP of
BPS.

The zinc used for galvanizing of core (if used) shall be electrolytic High Grade
Zinc of 99.95% purity. It shall conform to and satisfy all the requirements of
IS:209. The minimum mass of zinc coating shall conform to the requirements of

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relevant standard. Zinc-5% Aluminium –Mischmetal alloy coating, if used, shall

conform to and satisfy all the requirements of ASTM B 803 / B 958.

The Aluminium cladding of invar wires shall be with aluminum having purity not
less than 99.5 % and shall be thoroughly bonded to the core wire strand(s). The
minimum thickness of Aluminium cladding shall be 0.07mm to achieve a
minimum conductivity of 14% of IACS. The aluminum matrix core strands shall
conform to minimum conductivity of 24% IACS.

Where composite material for core is offered, the materials shall be of such
proven quality that its properties are not adversely influenced by the normal
operating conditions of a 220 kV transmission line in tropical environment
conditions these lines will be exposed to as detailed in Section-I. The bidder shall
provide adequate details including specifications/test reports/operating
experience details/performance certificates etc. in support of the suitability of
the offered materials along with the bid.

1.9 Standard Length

1.9.1 The standard length of the conductor shall be indicated by the bidder in the
guaranteed technical particulars of offer. A tolerance of +/-5% on the standard
length offered by the Bidder shall be permitted. Standard Length shall not be
more than 2500 m. All lengths outside this limit of tolerance shall be treated as
random lengths.

1.9.2 Random lengths will be accepted provided no length is less than 70% of the
standard length and the total quantity of such random lengths shall not be more
than 10% of the total quantity ordered. At any point, the cumulative quantity
supplied of such random lengths shall not be more than 12.5% of the total
cumulative quantity supplied including such random lengths. However, the last
20% of the quantity ordered shall be supplied only in standard lengths as
specified.

1.9.3 Bidder shall also indicate the maximum single length, above the standard length,
he can manufacture in the guaranteed technical particulars of offer. This is
required for special stretches like river crossing etc. The Employer reserves the
right to place orders for the above lengths on the same terms and conditions
applicable for the standard lengths during the pendency of the Contract.

1.10 Evaluation of Ohmic Losses & Differential Price Loading

1.10.1 Based on the conductor parameters guaranteed by the bidders, average ohmic
losses for different type of conductors offered by the bidders shall be calculated
as per the following formula:

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Average Ohmic loss (kW) = Total Running Conductor length X (Continuous

operating current under normal condition)2 XAC Resistance corresponding to
continuous operating current

For 832 km conductor length, continuous operating current of 615 Amp;

Average Ohmic loss (kW) = 832x (615)2 x Rac/1000

= 314,683.20 X Rac

Where Rac is the AC resistance per km guaranteed by the bidder at temperature

corresponding to the continuous operating current of 615 A under normal
condition.

Differential price evaluation for the conductors offered by the bidders shall be
carried out considering the average ohmic losses calculated as above and
considering US $ 2962 per kW.

The best parameter of loss (lowest ohmic loss for conductor) corresponding to
lowest AC resistance quoted among bidders by any technically responsive and
qualified bidder shall be taken as basis and that quoted by the particular bidder
shall be used to arrive at differential price to be applied for each bid.

2.0 Tests and Standards

2.1 Type Tests

2.1.1 Type Tests on Stranded Conductor/ Stranded wire

The following tests shall be conducted once on sample/samples of conductor

from each manufacturing facility:

(i) On complete Conductor

a) DC resistance test on stranded conductor : As per Annexure-A

b) UTS test on stranded conductor : As per Annexure-A

c) Radio interference voltage test (dry) : As per Annexure-A

d) Corona extinction voltage test (dry) : As per Annexure-A

e) Stress- Strain test on stranded conductor : IEC 61089

and core at room temperature

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f) Stress-strain test on stranded conductor and As per Annexure-A

core at elevated temperature

g) High temperature endurance & creep test : As per Annexure-A

on stranded conductor

h) Sheaves Test : As per Annexure-A

i) Axial Impact Test : As per Annexure-A

j) Radial Crush Test : As per Annexure-A

k) Torsional Ductility Test : As per Annexure-A

l) Aeolian Vibration Test : As per Annexure-A

m) Temperature Cycle Test : As per Annexure-A

(ii) On Conductor Strand/core

a) Heat resistance test on Aluminium Alloy : As per Annexure-A

strands or core

b) Bending test on Aluminium clad core (if : As per Annexure-A

applicable)

c) Compression test on Aluminium clad core (if : As per Annexure-A

applicable)

d) Coefficient of linear expansion on core wire : As per Annexure-A

e) Strand Brittle fracture test (for Carbon fibre : As per Annexure-A

composite core only)

Bending test on composite core (for Carbon

f) fibre composite core only) : As per ASTM B987

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2.1.2 Type tests specified under Clause 2.1.1 shall not be required to be carried out if a
valid test certificate is available for the offered design, i.e., tests conducted
earlier should have 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 the representative (s)
of POWERGRID or Utility.

In the event of any discrepancy in the test report (i.e., any test report not
applicable due to any design / material/manufacturing process change including
substitution of components or due to noncompliance with the requirement
stipulated in the Technical Specification) the tests shall be conducted by the
Contractor as per the quoted as per BPS schedule 4(d).

2.2 Acceptance Tests

a) Visual and dimensional check on drum : As per Annexure-A

b) Visual check for joints scratches etc. and : As per Annexure-A

length measurement of conductor by
rewinding

c) Dimensional check on core or core : As per Annexure-A

strands and Aluminium or Aluminium
Alloy strands

d) Check for lay-ratios of various layers : As per Annexure-A

e) Galvanising test on core strands(if : As per Annexure-A

applicable)

Coating Test on Zinc-5% Al-Mischmetal

f) alloy coating (if applicable) : As per ASTM B803/B
958
Adherence of Coating Test on Zinc-5% Al-
Mischmetal alloy coating (if applicable) : As per ASTM B803/B
g) 958

h) Thickness of aluminum on Aluminium : As per Annexure-A

clad wires

i) Torsion and Elongation tests on core : As per Annexure-A

strands

j) Breaking load test on core strands and : As per Annexure-A

Aluminium/Aluminium Alloy strands

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k) Wrap test on core strands and : As per IEC:888 &

Aluminium Alloystrands (not applicable
for carbon fibre composite core) IES:889

l) Minimum conductivity test on : As per IEC : 889

Aluminium/ thermal resistant Aluminium
Alloy strands

m) Procedure qualification test on welded : As per Annexure-A

joint of Aluminium/Aluminium
Alloystrands

n) Heat resistance test on Aluminium Alloy : As per Annexure-A

strands

o) Ageing test on filler (if applicable) : As per Annexure-A

p) Minimum conductivity test on Aluminium : As per Annexure-A

clad core wires (if applicable)

Glass transition temperature test (For

q) : As per Annexure-A
Carbon fibre-composite core only)

Flexural Strength test(For Carbon

r) : As per Annexure-A
Fibre-composite core only)

Galvanic layer thickness test (for Carbon

s) fibre composite core only) : As per ASTM B987

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Bending test on composite core (for

Carbon fibre-composite core only)
t) : As per ASTM B987

Note: All the above tests except (m) shall be carried out on Aluminium
Alloy and core / core strands after stranding only.

2.3 Routine Test

a) Check to ensure that the joints are as per Specification

b) Check that there are no cuts, fins etc., on the strands.

c) Check that drums are as per Specification

d) All acceptance tests as mentioned above to be carried out on 10 % of

drums

2.4 Tests During Manufacture

a) Chemical analysis of zinc used for galvanizing : As per Annexure-A

b) Chemical analysis of Aluminium alloy used for : As per Annexure-A

making Aluminium Alloy strands

c) Chemical analysis of core strands/composite : As per Annexure-A

core

2.5 Testing Expenses

2.5.1 As indicated in Clause 2.1.2, no type test charges shall be payable to the
supplier.

2.5.2 In case of failure in any type test the Supplier is either required to manufacture
fresh sample lot and repeat the entire test successfully once or repeat that
particular type test three times successfully on the sample selected from the
already manufactured lot at his own expenses. In case a fresh lot is
manufactured for testing then the lot already manufactured shall be rejected.

2.5.3 Bidder shall indicate the laboratories in which they propose to conduct the type
tests, if required. They shall ensure that adequate facilities are available in the
laboratories and the tests can be completed in these laboratories within the
time schedule guaranteed by them.

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2.5.4 The entire cost of testing for the acceptance and routine tests and Tests during
manufacture as well as type tests, if required, specified herein shall be treated as
included in the quoted unit price of conductor, except for the expenses of the
inspector/Employer's representative.

2.5.5 In case of failure in any type test, if repeat type tests are required to be
conducted, then all the expenses for deputation of Inspector/Employer's
representative shall be deducted from the contract price. Also if on receipt of
the Supplier's notice of testing, the Employer's representative does not find
material/ testing facilities to be ready for testing the expenses incurred by the
Employer for re-deputation shall be deducted from contract price.

2.5.6 The Supplier shall intimate the Employer about carrying out of the type tests
along with detailed testing programme at least 3 weeks in advance (in case of
testing in India) and at least 6 weeks in advance (in case of testing abroad) of the
schedule date of testing during which the Employer will arrange to depute his
representative to be present at the time of carrying out the tests.

2.6 Additional Tests

2.6.1 The Employer reserves the right of having at his own expenses any other test(s)
of reasonable nature carried out at Supplier’s premises, at site or in any other
place in addition to the aforesaid type, acceptance and routine tests to satisfy
himself that the materials comply with the Specifications.

2.6.2 The Employer also reserves the right to conduct all the tests mentioned in this
specification at his own expense on the samples drawn from the site at
Supplier’s premises or at any other test centre. In case of evidence of non
compliance, it shall be binding on the part of Supplier to prove the compliance of
the items to the technical specifications by repeat tests, or correction of
deficiencies, or replacement of defective items all without any extra cost to the
Employer.

2.7 Sample Batch For Type Testing

2.7.1 The Supplier shall offer material for selection of samples for type testing only
after getting Quality Assurance Plan approved from Employer’s Quality
Assurance Deptt. The sample shall be manufactured strictly in accordance with
the Quality Assurance Plan approved by Employer.

2.7.2 The Supplier shall offer at least three drums for selection of sample required for
conducting all the type test.

2.7.3 The Supplier is required to carry out all the acceptance tests successfully in
presence of Employer’s representative before sample selection.

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2.8 Test Reports

2.8.1 Copies of type test reports shall be furnished in at least three copies along with
one original. One copy will be returned duly certified by the Employer only after
which the commercial production of the material shall start.

2.8.2 Record of routine test reports shall be maintained by the Supplier at his works
for periodic inspection by the Employer’s representative.

2.8.3 Test Certificates of tests during manufacture shall be maintained by the Supplier.
These shall be produced for verification as and when desired by the Employer.

2.9 Inspection

2.9.1 The Employer’s representative shall at all times be entitled to have access to the
works and all places of manufacture, where conductor shall be manufactured
and representative shall have full facilities for unrestricted inspection of the
Supplier’s works, raw materials and process of manufacture for conducting
necessary tests as detailed herein.

2.9.2 The Supplier shall keep the Employer informed in advance of the time of starting
and of the progress of manufacture of conductor in its various stages so that
arrangements can be made for inspection.

2.9.3 No material shall be dispatched from its point of manufacture before it has been
satisfactorily inspected and tested, unless the inspection is waived off by the
Employer in writing. In the latter case also the conductor shall be dispatched
only after satisfactory testing for all tests specified herein have been completed.

2.9.4 The acceptance of any quantity of material shall in no way relieve the Supplier of
any of his responsibilities for meeting all requirements of the Specification, and
shall not prevent subsequent rejection it such material is later found to be
defective.

2.10 Test Facilities

2.10.1 The following additional test facilities shall be available at the Supplier’s works:

a) Calibration of various testing and measuring equipment including tensile

testing machine, resistance measurement facilities, burette, thermometer,
barometer etc.

b) Standard resistance for calibration of resistance bridges.

c) Finished conductor shall be checked for length verification and surface finish
on separate rewinding machine at reduced speed (variable from 8 to 16 meters

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per minute). The rewinding facilities shall have appropriate clutch system and
free of vibrations, jerks etc. with traverse laying facilities.

2.11 Packing

2.11.1 The conductor shall be supplied in non-returnable, strong, wooden/painted

steel/hybrid (painted steel cum wood) drums provided with lagging of adequate
strength, constructed to protect the conductor against all damage and
displacement during transit, storage and subsequent handling and stringing
operations in the field. As an alternative to wooden drum Bidder may also supply
the conductors in returnable painted steel drums or returnable wood-Steel
hybrid drums. The Supplier shall select suitable drums for supply of conductor
and shall be responsible for any loss or damage to conductor and/or drum
during transportation handling and storage due to improper selection of drum or
packing. Wooden/Steel drum/Wood-Steel hybrid drum will be treated at par for
evaluation purpose and accordingly the Bidder should quote in the package.

2.11.2 After completion of stringing works, the supplier shall take back or dispose off
the empty drums on his own, except for the drums of spare conductor, if any,
which shall be kept by the Owner.

2.11.3 The drums shall be suitable for wheel mounting and for letting off the conductor
under a minimum controlled tension of the order of 5 KN.

2.11.4 The Bidder should submit their proposed drum drawings along with the bid.

2.11.5 One conductor length only shall be wound on each drum.

2.11.6 The conductor ends shall be properly sealed and secured on the side of one of
the flanges to avoid loosening of the conductor layers during transit and
handling.

2.11.7 Marking

Each drum shall have the following information stenciled on it in indelible ink
along with other essential data :

(a) Contract/Award letter number.

(b) Name and address of consignee.

(c) Manufacturer’s name and address.

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(d) Drum number

(e) Size of conductor

(f) Length of conductor in meters

(g) Arrow marking for unwinding

(h) Position of the conductor ends

(i) Distance between outer-most Layer of conductor and the inner

surface of lagging.

(k) Barrel diameter at three locations & an arrow marking at the location
of the measurement.

(l) Number of turns in the outer most layer.

(m) Gross weight of drum after putting lagging.

(n) Tear weight of the drum without lagging.

(o) Net weight of the conductor in the drum.

(p) CIP/MICC No.

The above should be indicated in the packing list also.

2.12 Verification of Conductor Length

The Employer reserves the right to verify the length of conductor after unreeling
at least ten (10) percent of the drums in a lot offered for inspection.

2.13 Standards

2.13.1 The conductor shall conform to the following Indian/International Standards,

which shall mean latest revisions, with amendments/changes adopted and
published, unless specifically stated otherwise in the Specification.

2.13.2 In the event of the supply of conductor conforming to standards other than
specified, the Bidder shall confirm in his bid that these standards are equivalent
to those specified. In case of award, salient features of comparison between the

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standards proposed by the Supplier and those specified in this document will be
provided by the Supplier to establish their equivalence.

Sl. Title International

No. Standard

1. Specification for zinc BS:3436-1986

2. Specification for Aluminium IEC:1089-1991

Conductors for Overhead BS:215-1970
Transmission Purposes

3. Aluminum Conductor Galvanised BS;215-1970

Steel Reinforced IEC:1089-1991

4. Aluminum Conductor Galvanised IEC:1089-1991

Steel- Reinforced For Extra High
Voltage (400 KV) and above BS:215-1970

5. Reels and Drums for Bare Conductors BS:1559-1949

6. Method of Tensile Testing of Steel ISO 6892-1984

Wire

7. Recommended Practice for Hot Dip

Galvanising of Iron and Steel

8. Method of Testing Uniformity of

Coating on Zinc Coated Articles

9. Galvanised Coating on Round Steel IEC : 888-1987

Wires
BS:443-1969

10. Methods of Determination of Weight BS:433-1969

of Zinc Coating of Zinc Coated Iron
and Steel ISO 1460 - 1973
Articles

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Sl. Title International

No. Standard

11. Method of Radio Interference Tests IEC:437-1973

on High Voltage Insulators
NEMA:107-
1964 CISPR

12. Aluminium Alloy Redraw Rods IEC 104 - 1987

13. Zinc Coated steel wires for stranded IEC : 888-1987

Conductors

14. Hard drawn Aluminium wire for IEC : 889-1987

overhead line conductors

15. Aluminium Alloy stranded conductor IEC : 208-1966

BS-3242-1970

16. Aluminium clad steel wires IEC:1232

17. Method of measurement of resistivity IEC:468

of metallic materials

18 Ampacity IEEE738

19. Thermal resistant Aluminium Alloy IEC 62004

The standards mentioned above are available from:

Reference Abbreviation Name and Address

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Reference Abbreviation Name and Address

BS British Standards,

British Standards Institution

101, Pentonvile Road,

N - 19-ND

UK

IEC/CISPR International Electro technical Commission,

Bureau Central de la Commission,

electro Technique international,

1 Rue de verembe,

Geneva

SWITZERLAND

BIS/IS Beureau Of Indian Standards.

ManakBhavan,

9, Bahadur Shah ZafarMarg,

New Delhi - 110001.

INDIA

ISO International Organisation for

Standardization.

Danish Board of Standardization

Danish Standardizing Sraat,

Aurehoegvej-12

DK-2900, Heeleprup,

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Reference Abbreviation Name and Address

DENMARK.

NEMA National Electric Manufacture Association,

155, East 44th Street.

New York, NY 10017

U.S.A.

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Annexure-A

1.0 Tests on Conductor

1.1 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 5 m length between fixing arrangement
suitably fixed by appropriate fittings on a tensile testing machine. 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 steady rate to minimum 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.

1.2 Corona Extinction Voltage Test

Two samples of conductor of minimum 5 m length each shall be strung in

horizontal twin bundle configuration with spacing of 450 mm between sub
conductors at a height not exceeding 7.01 m above ground. The sample
assembly when subjected to power frequency voltage shall have a corona
extinction voltage of not less than 154 kV (rms) line to ground under dry
condition. There shall be no evidence of corona on any part of the samples. The
test should be conducted without corona control rings. However, small corona
control rings may be used to prevent corona in the end fittings. The voltage
should be corrected for standard atmospheric conditions.

1.3 Radio Interference Voltage Test

Under the conditions as specified under (1.2) above, the conductor samples shall
have radio interference voltage level below 1000 microvolts at one MHz when
subjected to 50 Hz AC voltage of 154 kV line to ground under dry conditions. This
test may be carried out with corona control rings and arcing horns.

1.4 D.C. Resistance Test on Stranded Conductor

On a conductor 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 or using micro ohm meter of suitable accuracy 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 20deg C as per IS:398-(Part-IV)/(Part-V). The
resistance corrected at 20deg C shall conform to the requirements of this
Specification.

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1.5 Stress-strain test at elevated temperature

Stress-strain test as per IEC-1089 shall be conducted keeping conductor

temperature at designed maximum temperature.. UTS for this test shall be as
guaranteed in the GTP.

1.6 High Temperature endurance & creep test

Two conductor samples of length equal to at least 100 X d + 2 X a (where, d is

the conductor diameter and a is the distance between the end fitting and the
gauge length) shall be strung at tension equal to 25 % of conductor UTS. The
distance, a, shall be at least 25 % of the gauge length or 2 m whichever is the
smaller. The conductor samples shall be subjected to tests as indicated below:

(i) On one of the conductor samples, the conductor temperature shall be

maintained at 20 deg C for 1000 hours. The elongation/creep strain of the
conductor during this period shall be measured and recorded at end of 1
hour, 10 hour, 100 hour and subsequently every 100 hour up to 1000 hours
time period.

(ii)On other conductor sample, the conductor temperature shall be increased to

designed maximum temperature in steps of 20 deg. C and thermal elongation
of the conductor sample shall be measured & recorded at each step. The
temperature shall be held at each step for sufficient duration for stablisation
of temperature. Further, the temperature of the conductor shall be
maintained at designed maximum temperature (+10 Deg. C) for 1000 hours.
The elongation/creep strain of the conductor during this period shall be
measured and recorded at end of 1 hour, 10 hour, 100 hour and subsequently
every 100 hour up to 1000 hours time period. After completion of the above,
the core of the conductor sample shall be subjected to UTS test as mentioned
above at clause 1.1 of Annexure-A. The conductor core shall withstand a load
equivalent to 95 % of UTS. In case of carbon-fibre-composite core conductor,
the flexural strength & glass transition temperature of the core shall also be
evaluated and the same shall not be degraded by more than 10 % over the
initial value. The supplier shall plot the thermal elongation with temperature.

The supplier shall furnish details of creep characteristic in respect of the

conducted based on laboratory test and other laboratory investigations/
experimental conducted on similar type of conductor and shall indicate creep
strain values corresponding to 1 month, 6 month, 1 year, 10 year & 20 year
creep at everyday tension & designed maximum temperature as well as room
temperature.

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1.7 Sheaves Test

The conductor sample of minimum length of 35 meter shall be tensioned at 22 %

of the UTS and shall be passed through pulleys having diameter of 32 times that
of the conductor with angle of 20 deg. between the pulleys. The conductor shall
be passed over the pulleys 36 times a speed of 2 m/sec. After this test UTS test
on the conductor shall be carried out. In case of composite core conductors, the
core shall be inspected for any sign of damage or cracking through dye
penetration test as per ASTM B987.

1.8 Axial Impact Test

The conductor sample shall be suspended vertically and load applied by

dropping a 650 Kg from an elevation of 4 meters above the sample. The impact
velocity shall be not be less than 8 m/sec. with an intial pre-tension of 200 kgs.
The curve for load vs time shall be recorded and recorded load of failure for core
shall not be less than UTS of core.

1.9 Radial Crush Test

A section of conductor is to be crushed between two six inch steel platens. Load
shall be held at 350 Kgs for 1 minute and then released. Core/ core strands shall
be subsequently disassembled and tensile tested. Core/ core strands shall
exhibit full strength retention vis-a-vis guaranteed breaking strength of core
wires (after stranding).

1.10 Torsional Ductility Test

The conductor sample of 10-15 m shall be loaded to 20% of UTS and then
rotated in increasing steps of +/-180 deg. In case of INVAR type HTLS conductor,
the entire conductor shall withstand at least 16 such rotation and there shall not
be any damage to Aluminium Alloy or INVAR core wires.

In case of carbon-fibrecomposite core conductors, after 4 rotations or after

separation of Aluminium strands, the Aluminium wires shall be cut and removed
from the conductor and the exposed core shall be twisted upto 16 rotations. The
composite core shall not break after completion of 16 rotations.

1.11 Aeolian Vibration Test

The conductor and supporting hardware shall be loaded to 25% of UTS. A

dynamometer, load cell, calibrated beam or other device shall be used to
measure the conductor tension. Some means should be provided to maintain
constant tension to allow for temperature fluctuations during the testing. The
overall span between system terminations shall be a minimum of 30 m. The span
shall be supported at a height such that the static sag angle of the cable to

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horizontal is (1.5 + 0.5) deg in the active span. Means shall be provided for
measuring and monitoring the mid-loop (antinode) vibration amplitude at a free
loop, not a support loop. An electronically controlled shaker shall be used to
excite the conductor in the vertical plane. The shaker armature shall be securely
fastened to the conductor so it is perpendicular to the conductor in the vertical
plane. The shaker should be located in the span to allow for a minimum of six
vibration loops between the suspension assembly and the shaker

The test shall be carried out at one or more resonance frequencies(more than 10
Hz) . The amplitude (peak-to-peak) at the antinode point shall be one third of
conductor diameter. The assembly shall be vibrated for not less than 10 million
cycles without any failure. After the test, the conductor should not exhibit any
damage (broken strands). The conductor shall be tested to demonstrate that it
retains at least 95% UTS.

1.12 Temperature Cycle Test

The purpose of this test is verification of degradation characteristics of metallic

and non-metallic material when subjected to thermal cycling temperature
cycling can create large internal stresses due to thermal expansion mismatch
between constituents.

Test Methods:-

-Mechanical tension, 20 % UTS, marks on the conductor at the edge of the

conductor

-100 cycles from room temperature up to designed maximum temperature. Hold

at designed maximum temperature + 2.5deg. C for 5 minutes

-After the above mentioned 100 cycles, the mechanical tension shall be
increased up to 70 % UTS at room temperature and kept at this tension for
24hrs. Thereafter, release to 20 % UTS.

-This cycling test shall be repeated 5 times.

-During the test, temperature of connectors, conductor and resistance are

recorded according to ANSI C 119.

-A breaking load test is applied at the end of the test. Conductor strength has to
be higher than 95 % UTS.

-In case of carbon-fibre composites, the flexural strength should not be less than
90% of the value guaranteed in GTP and the Glass Transition temperature shall
not be less than 90% of the value guaranteed in GTP after thermal cycling.

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Flexural strength shall be obtained on the basis of test procedure indicated at

1.32 below.

1.13 Heat Resistance test on Aluminium Alloy wire

Breaking load test as per clause 1.21 above shall be carried out before and after
heating the sample in uniform heat furnace at following temperature for one
hour. The breaking strength of the wire after heating shall not be less than the
90% of the breaking strength before heating:-

Maximum continuous operating Test Temperature

temperature of the conductor

Upto 150 deg. C 230 degC (+5/-3 degC)

More than 150 deg. C &upto 210 deg. C 280 degC (+5/-3 degC)

More than 210 deg. C &upto 230 deg. C 400 degC (+5/-3 degC)

1.14 Bending test on Aluminium clad core wire (if applicable)

A sample of Aluminium clad invar strand measuring 30 cm in length shall be

subject to bending with help of a vise. The vised length of wire should be 5 cm
and radius of bend 4.8 mm. The bending should be first 90 degrees left and 90
degree right. After this operation the strand should cut at the bending point.
There should be no separation of core and Aluminium at the bending point after
this operation.

1.15 Compression test on Aluminium clad wires (if applicable)

A sample of Aluminium clad core strand 10 mm in length is to be compressed by

a plate with a load of 3600 kgs. The Aluminium clad core strand should not
break.

1.16 Coefficient of linear expansion for core/ core wires

The temperature and elongation on a sample shall be continuously measured

and recorded at interval of approximately 15 degree C from 15 degree C to
designed maximum temperature corresponding to rated current(1200A)by
changing the temperature by suitable means. Coefficient of linear expansion
shall be determined from the measured results.

1.17 Strand Brittle fracture test (for carbon-fibre composite core only)

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The sample shall be tensioned to approx. 25 % of UTS with simultaneous

application of 1N-HNO3 acid directly in contact with naked polymer composite
core for 96 hrs. The contact length of acid shall not be less than 40mm and
thickness around the core not less than 10mm.The rod shall withstand UTS test
after 96 hours.

1.18 Visual and Dimensional Check on Drums

The drums shall be visually and dimensionally checked to ensure that they
conform to the approved drawings.

1.19 Visual Check for Joints, Scratches etc.

Conductor drums shall be rewound in the presence of the Employer. The

Employer shall visually check for scratches, joints etc. and that the conductor
generally conform to the requirements of this Specification. Ten percent (10%)
drums from each lot shall be rewound in the presence of the Employer's
representative.

1.20 Dimensional Check on Core/ CoreWires and Aluminium/ Aluminium Alloy

Wires

The individual strands shall be dimensionally checked to ensure that they

conform to the requirement of this Specification. Diameter of formed wires shall
be determined as per Clause 6.3.1.2 of IEC 62420.

1.21 Check for Lay-ratios of Various Layers

The lay-ratios of various layers shall be checked to ensure that they conform to
the guaranteed values furnished by the Contractor.

1.22 Galvanising Test

The test procedure shall be as specified in IEC: 888. 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.

1.23 Aluminum thickness on aluminum clad wires (if applicable)

The thickness of Aluminium of the specimen shall be determined by using

suitable electrical indicating instruments operating on the permeameter
principle, or direct measurement. Measurements shall be read to three decimal
places, and number rounded to two decimal places is considered as measured
thickness. For reference purposes, direct measurement shall be used to
determine Aluminium thickness on specimens taken from the end of the coils.

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1.24 Torsion and Elongation Tests on Composite Core/ INVAR Core wires

For INVAR type HTLS conductor, the test procedures for Torsion and Elongation
tests on core wires shall be as per clause No. 6.3.3 and Clause 6.3.2 (b) of IEC
61232 respectively. In torsion test, the number of complete twists before
fracture shall not be less than the value specified in the GTP on a length equal to
100 times the standard diameter of the strand. 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 the value specified in the
GTP for a gauge length of 250 mm.

In case of carbon-fibre composite core HTLS conductor, the following procedure

shall be applicable:-

i) Elongation Test:- The elongation of the composite core sample at fracture

shall be determined using extensometer. The load along the core shall be
gradually increased. The elongation achieved on reaching the tensile strength
of the core shall not be less than the value guaranteed in the GTP.

ii) Torsion Test : The purpose of the testis to determine the resilience of the
composite core to twisting and to show that after the composite core has
experienced the prescribed twisting, it will not crack or have a loss in tensile
strength due to the twisting. A sample length that is 170 times the diameter
of the composite core being tested is mounted in the gripping fixtures. One
grip shall then be fixed so that it does not twist and the other end shall be
twisted a full 360 degrees and then fixed in this position for 2 minutes. Once
the twist time is completed, the core is untwisted an inspected for any crazing
or other damage. If no damage is observed, the composite core is then tensile
tested to failure and the final load recorded. For the test to be accepted, the
composite core must withstand at least 100% of its rated tensile strength.
Two samples need to be completed in order to satisfy the testing
requirement.

1.25 Breaking load test on Aluminium/ Aluminium Alloy &Composite core/ INVAR
Corewires and D.C Resistance test on Aluminium/ Aluminium Alloy wire

The above tests shall be carried out as per IEC: 888/889 or relevant international
standards and the results shall meet the requirements of the specification.

1.26 Wrap test on Core wires (Applicable for steel/Al clad Steel/invar core only)

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The wrap test on core strands shall be meet the requirements of IEC: 888. In
case of Aluminium clad core wire, the same shall be wrapped around a mandrel
of diameter of five times that of the strand to form a helix of eight turns. The
strand shall be unwrapped. No breakage of strand shall occurred.

1.27 Minimum conductivity test on thermal resistant Aluminium alloy wire

Resistivity test as per IEC-468/IEC 889 shall be conducted to confirm minimum

conductivity as per specification requirement.

1.28 Procedure Qualification test on welded Aluminium/ Aluminium Alloy wire.

Two Aluminium/ Aluminium Alloy wire 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 guaranteed breaking strength
of individual strands.

1.29 Ageing Test on Filler (if applicable)

The test shall be done in accordance with Grease drop point test method. The
specimen should be drop as a droplet when kept at a temperature 40 deg. C
above designed maximum operating temperature of the conductor for 30
minutes. The temperature shall then be increase till one droplet drops and the
temperature recorded.

1.30 Aluminium conductivity test on Aluminium clad wire (if applicable)

Resistivity test as per IEC-468 shall be conducted to confirm minimum

conductivity as per specification requirement.

1.31 Glass Transition Temperature Test (for carbon-fibrecomposite core only)

Test method shall be as per ASTM D7028, A Standard Test Method for Glass
Transition Temperature of Polymer Matrix Composites by Dynamic Mechanical
Analysis. The glass transition temperature shall be greater than the designed
maximum temperature of the offered HTLS conductor +35 ° C.

1.32 Flexural Strength Test (for carbon-fibre composite core only)

Test method shall be as per ASTM D7264, ASTM D4475 or ISO 14125.

1.33 Chemical Analysis of Aluminium/Aluminium Alloy and Composite core/INVAR

Core Wires

Samples taken from the Aluminium /Aluminium Alloy and core coils/strands shall
be chemically/spectrographically analysed. The same shall be in conformity to

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the particulars guaranteed by the bidder so as to meet the requirements stated

in this Specification.

1.34 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 the
Specification.

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Annexure-B

Calculation of sag & tension for INVAR type HTLS Conductor

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Definition of Symbols are as follows:-

tc Knee point Temperature

Tc Tension at Knee point temperature, tc

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Envelope

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SAMPLE CALCULATION

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