IS 398 ( Part 5 ) : 1992

( Reaffirmed 1997 )

lndian Standard
ALUMINIUMCONDUCTORFOROVERHEAD
TRANSMISSIONPURPOSES-SPECIFICATION
PART 5 ALUMINIUM CONDUCTORS - GALVANIZED STEEL - REINFORCED
FOR EXTRA HIGH VOLTAGE ( qO0 kV AND ABOVE )

( First Revision)
First Reprint JUNE 1994

UDC 621.31555 [ 669.71-427 ] : 621.315.145

Q BIS 1992

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAPAR MAR0
NaW DELHI 110002

May 1992 Price Group 4

 Conductors and Accessories for Overhead Lines Sectional Committee, ET 37

FOREWORD
This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards, after
the draft finalized by the Conductors and Accessories for Overhead Lines Sectional Committee
had been approved by the Electrotechnical Division Council.
This standard has been prepared to cover the requirements of ACSR conductors for use on extra
high voltage lines ( 400 kV and above ). At such high voltages corona and radio interference
attain great importance and special attention has to be paid to the finish of the conductor.
Tests to ascertain conformity in,this regard have also been stipulated in the standard:
This standard ( Part 5 ) was first published in 1982. At that time the development of EHV
network was envisaged at 400 kV ac only. For this system after detailed techno-economic
studies by_CEA, 54/3. 53 mm Al+ 7/3-53 mm steel conductor in the form of horizontal twin
conductor bundle with a subconductor spacing of 450 mm was identified as the most suitable
conductor. However, with the expansion of 400 kV network and with the development of
f 500 kv dc and 800 kV ac systems, use of additional types of ACSR conductors is envisaged
in the country. This revision, therefore; covers three types of conductors instead of only one
covered in t-he earlier version of the standard. It is, however, not intended to restrict the
standard to the parameters of these conductors only and requirements for other conductors for
EHV purpose will be added later as and when the need arises.
In the standard value adopted for resistivity of EC grade aluminium is O-0282 64 ohm. mm*/m
at 20°C which is the value adopted in the IEC Standard also.
This part deals with aluminium conductors galvanized steel reinforced for high voltages ( 400 kV
and above ) and it forms Part 5 of the series. The other parts in the series are given below:
Part 1 : Aluminium stranded conductors
Part 2 : Aluminium conductors galvanized steel reinforced
Part 3 : Aluminium conductors, aluminium steel reinforced
Part 4 : Aluminium alloy stranded conductor
IS 398 ( Part 2 ) : 1976 to which reference has been made in this standard is a necessary
adjunct to this standard. Should, however, any deviation exist between IS 398 ( Part 2 ) 1976
and those of this standard, the provision of the latter shall apply,
For the purpose of deciding whether a particular requirement of this standard is complied with,
the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded
off -in accordance with IS 2 : 1960 ‘Rules for rounding ofi numerical valves. ( revised ).’ The
number of significant places retained in the rounded off value should be the same that of the
specified value in this standard.
 IS 398 ( Part 5 ) : 1992

Indian Standard
ALUMINIUM CONDUCTORFOROVERHEAD
TRANSMISSION PURPOSES-SPECIFICATION
PART 5 ALUMINIUM CONDUCTORS-GALVANIZED STEEL-REINFORCED
FOR EXTRA HIGH VOLTAGE ( 400 kV AND ABOVE )

( First Revision )
1 SCOPE 4 PHYSICAL CONSTANTS FOR HARD-
DRAWN ALUMINIUM
This standard ( Part 5 ) covers the requirements
and tests for aluminium conductors, galvanized 4.1 Resistivity
steel-reinforced used for extra high voltage The resistivity of aluminium depends upon its
overhead power lines ( 400 kV and above ). purity and its physical condition. For the
purpose of this standard, the maximum value
2 REFERENCES permitted is O-028 264 ohm. mm?/m at 20°C
and this value has been used for calculation of
The Indian Standards listed in Annex A are the maximum permissible value of resistance.
necessary adjuncts to this standard.
NOTE - It is not intended to check the resistivity
3 TERMINOLOGY from the measured values of resistance.

For the purpose of this standard, the following 4.2 Density

definitions in addition to those given in
IS 398 ( Part 2 ) : 1976 shall apply. At a tempera’ture of 2O”C, the density of hard-
drawn aluminium has been taken as 2.703
3.1 Type Tests kg/dm>.

Tests intended to prove that the quality and 4.3 Constant-Mass Temperature Coefftcient of
design of a given type of article are in accor- Resistance
dance with the specifications. At a temperature of 20” C the constant-mass
temperature coefficient of resistance of hard-
3.2 Acceptance Tests drawn aluminium measured between two
Tests carried out on samples drawn from a lot potential points rigidly fixed to the wire, the
for the purpose of acceptance of the lot. metal being allowed to expand freely, has been
taken as O-004 per degree Celsius.
3.3 Routine Tests 4.4 Coefficient of Linear Expansion
Tests carried out by the manufacturer/supplier The coefficient of linear expansion of hard-
on all the coils to check the requirements drawn aluminium at 0’ C has been taken as
which are likely to vary during manufacture. 23.0 x 1O-6 per degree Celsius. This value
holds good for all practical purposes over the
3.4 Conductor Rundle range of temperature from 0°C to the highest
safe operatmg temperature.
The combination of more than one conductors
perphase in parallel suitably spaced from each 5 PHYSICAL CONSTANTS FOR
other used in overhead transmission lines. GALVANIZED STEEL WIRES
5.1 Density
3.5 Subconductor
At a temperature of 2O”C, the density of
The individual conductor in a bundle defined galvanized steel wire is to be taken as 7-80
in 3.4. kg/dmY.

1
IS 398 ( Part 5 ) : 1992

5.2 Coefficient of Linear Expansion NOTE - Lithium soap grease corresponding to

Grade II of IS 7623 : 198.5 is suitable for such
In order to obtain uniformity in calculations a application.
value of 11.5x 1O-6/” C may be taken as the
value for the coefficient of liner expansion of 7 FREEDOM FROM DEFECTS
galvanized steel wires used for the cores of
steel-reinforced aluminium conductors. 7.1 The wires shall be smooth and free from all
imperfections such as spills, splits, slag
inclusion, die marks, scratches, fittings, blow-
6 MATERIAL holes, projections, looseness, overlapping of
stands, chipping of aluminium layers, etc and
6.1 The conductors shall be constructed from all such other defects as may hamper the
EC grade aluminium rods suitably hard-drawn mechanical and electrical properties of the
an wire drawing machine ( IS 1841 :. 1978 conductor. Special care should be taken to
and IS 5484 : 1978 can be referred for the keep away dirt, grit, etc during stranding.
aluminium rod specifications). The mechani-
cal and electrical properties of aluminium wire
shall comply with the requirements given in 8 STANDARD SIZES
Table 1. 8.1 Wires
6.1.1 Galvanized steel wire should be drawn 8.1.1 Nominal Sizes
from high carbon steel rods produced by either
acid or basic open heart process, electric The aluminium and galvanized steel wires for
ftirnace process or basic oxygen process. The the standard conductor covered by this. stan-
mechanical and electrical properties of wire dard shall have diameters specifie’d in Tables 1
shall comply with the requirements given in and 2. The diameter of the steel wires shall
Table 2. The chemical composition of high be measured over the zinc coating.
carbon steel wire is given in Annex B for the
purpose of guidance. 8.1.2 Tolerances on Nominal Sizes

8.1.2.1 Aluminium wires

6.2 The zinc used for galvanizing shall be elec-
trolytic high grade zinc not less than 99.95 A tolerance of f0.5 percent shall be permitted
percent purity. It shall conform to and satisfy on the nominal diameter specified in Table 1.
all the requirements of JS 209 : 1979. Galvamz-
ing may be done either by hot process or 8.1.2.2 Galvanized steel wire
electrolytic process.- When specified by the pur-
chaser, neutral grease may be applied between A tolerance of f 2 percent shall be permitted
the layers of wires. on the normal diameter specified in TabIe 2.

Table 1 Aluminium Wires Used in the Construction of Aluminium Conductors,

Galvanized Steel Reinforced for Extra High Voltages

(Cluuses6.1, 8.1.1,8.1.2.1, 13.5.2.1 and 13.10)

Diameter Cross Sectional Mass Resistance Breaking Load

c- _---- Area of Nominal at 20°C (----_I--___
Nom Min ---- Max Diameter Max Before After
Wires Stranding Stranding
(1) (2) (3) (4) (5) (6) (7) (8)
mti mm mm mm* kg/km n/km kV kN
3.53 3.51 3.55 9*187 26.45 2.921 1.57 1.49
4.13 4.11 4.15 13.3% 36*20 2.130 2.15 2.04
4.57 4.55 4.59 16403 44.34 1.738 2.64 2.51

NOTES
1 The resistance has been calculated from the cross-sectional area based on ntinimum diameter and a
resistivity of 0.028264 ohm. mm*/m.
2 me resistar.ce of individual wires shall be such that the completed stranded conductor meets the require_
ments of the maximum resistance specified in COI 8 of Table 3.

2
 IS 398 ( Part 5 ) : 1992

Table 2 Steel Wires Used in the Construction of Aluminium Conductors,

Galvanized Steel-Reinforced for Extra High Voltages

(C/uuses6.1.1, 8.1.1 and8.1.2.2)

Diameter Cross Sectional Mass Breaking Load

T---_~-_-- Area of Nominal Min
Nom Min Diameter /--_----T
Wires Before After
Stranding Stranding
(1) (2) (3) (4) (5) (6) (7)
mm mm mm mm ! kg/km kN kN
3.53 3.46 3.60 9.787 76.34 12.86 12-22
2.30 2.25 2.35 4.155 32.41 5.63 5.35
2.54 2.49 2.59 5.067 39.52 6-87 6.53

NOTE - In order to maintain the circularity of the NOTE - Joints have not been permitted in the steel
wires the tolerances allowed in 8.1.2.1 and 8.1.2.2 wires after final drawing in order to avoid reduc-
shall apply to both the measurements at right angles tion in the breaking strength of the conductors that
taken at the same cross-section as per 2.2 of IS 398 may occur as a result of failure of the joints.
( Part 2 ) : 1976.

8.2 Aluminium Conductors, Galvanized Steel- 10 STRANDING

Reinforced
10.1 The wires used in the construction of a
8.2.1 The size and properties of ACSR conduc- galvanized steel-inforced aluminium conductor
tors shall be given in Table 3. shall, before stranding, satisfy all the relevant
requirements of this standard.
8.2.2 The resistance of stranded conudctor
shall be in accordance with Table 3. The mass 10.2 The lay ratio of the different layers shall
( excluding the mass of grease, if applied ) is be within the ‘limits given in Table 4
given in Table 3 for information.
10.3 The ratio of the nominal diameter of the
9 JOINTS IN WIRES aluminium wires to the nominal diameter of the
9.1 Aluminium Wires
galvanized steel wires of ACSR conductor, shall
conform to the values given in Table 4.
No joint shall be permitted in the aluminium
wires in the outermost layer of the ACSR cond- 10.4 In all constructions, the successive layers
uctor. Joints in the individual aluminium shall have opposite directions of lay, the
wires in the layers are permitted in addition to outermost layer being right-handed. The
those made in the base rod or wire before final wires in each layer shall be evenly and closely
drawing, but no two such joints shall be less stranded.
than 15 m apart in the complete stranded
conductor. Such joints shall be made by the 10.5 In conductors having multiple layers of
cold pressure butt-welding. They are not aluminium wires, the lay ratio of any alumin-
required to fulfil the mechanical requirements ium layer shall not be greater than the lay
for the unjoined wires. ratio of the aluminium layer immediately
NOTE -Joints are not permitted in the outermost
beneath it.
layer of the conductor in order to ensure a smooth
conductor finish and reduce radio interference 11 LENGTHS AND VARIATIONS IN
levels and corona losses in the extra high voltage
lines. LENGTHS

9.2 Galvanized Steel Wires 11.1 Standard Length

There shall be no joints except those in the Unless otherwise agreed to between the pur-
base rod or wire before final drawing, in steel chaser and the manufacturer, galvanized steel-
wires forming the core of the steel-reinforced reinforced aluminium conductors shall be
aluminium conductor. supplied in the lengths from l-2 to 1.5 km.

3
IS39S(Part5):1992

Table 3 Aiuminium Condktors, Galvanized Steel-Reinforced for

Extra High Voltages
( Clause 8.2.2 )

Stranding and Sectional Total Approx Approx Calculated Appr?x

Wire Diameter Area of Sectional O*e41 Mass Resistance at
--‘h--__, Aluminium Area Diameter 20°C Bf,‘“Bska
Gumi- Steel Max Min
nium
(I) (2) (3) (4) (5) (6) (7) (8) (9)
mm mm mm mm nlm* mm kg/km Q/km kN
520 541353 713.53 528.5 597.0 31.77 2004 0.055 52 I61 +20
560 4214.13 712.13 562.7 59i .7 31.68 1 787 0.051 99 120.16
690 4214.57 712.54 688.9 72+4 35.04 2 187 0.042 42 146.87

NOTES
1 Mass of the conductoi mentioned in col 7 is different from the mass of the corresponding conductor in
other parts of this stindard due to the difference in mean lay ratio specified in this part of the standard.
2 Resistar.c-_ of the conductor mentioned in Cal 8 is different from the values specified for the corresponding
conductors in other parts of this standard due to the following factors:
a) Lower values of resistivity;
b) Difference in mean lay ratio; and
c) Differer.c:: in tolerance on ihe no!?ln.iI diameter of aluminium wire.

l’abie 4 Lay Ratio of Aluminium Conductors Galvanized Steel-Reinforced

( Clauses 10.3 and 13.4 )

Nominal Number of Ratio Alumi- Lay Ratios Lay Ratios for Aluminium Wire
Aluminium Wires nium Wires for Steel c-_-_--__- -------\
Area r-_C._ Diameter to Core Outside Layer Imme- Innermost Layer
Alumi- Steel Steel Wire ( 6 Wire Layer ) Layer diately Beneath of Conductor with
nium Diameter A- ,----- Outside Layer 3 Aluminium
G-- Max Mitt Max Wire Layer
z--7 Xax C--_-h--,
Min Max
(1) (21 (3) (4) (5) (6) (7) (8) (9) (10) (‘1) (12)
520 54 7 I.00 I6 18 10 I2 I1 I3 I2 I4
560 42 7 I .79 16 18 10 I2 II I3 12 I4
690 ,42 7 I.79 I6 24 IO 14 IO I6 10 I6
NOTE -For the purpose of calculation, the mean lav ratio shall be taken as the airthmatic mean of the
relevant minimum and maximum values given in this Table.

11.2 Random Length 12 PACKING AND- MARKING

UrJess otherwise agreed to between the pur- 12.1 The conductor shall be wound on non-
chaser and the supplier it shall be permissible returnable drums conforming to IS 1778 : 1980
to supply not more than 5 percent of the length strong enough and provided with lagging of ’
on any one order in random lengths; none of adequate strength, constructed to protect the
them shall be shorter than one half of the conductor against all damages and displace-
nominal length. ments during transit, storage and subsequent.

4
 IS 398 ( Part 5 ) : 1992

handling and straining operations in the field. 13.1.2 Acceptance Tests

Only one conductor length shall be packed on
each drum. The following shall constitute the acceptance
tests:
12.2 Each drum shall have the following in- a) Visual examination ( see 13.2 );
formation marked on it along with other b) Measurement of. diameters of individual
essential data: aluminium and steel wires ( see 13.3 );
c) Measurement of lay rat!, ( see 13.4 );
a ) Contract/specification number;
d) Breaking load test on indivi-dual wires
b ) Name and address of the consignee; ( see 13.5.2 ) ;
cl Indicating the s’?urce of manufacture; e) Ductility test ( see 13 6 I;
f) Wrapping test ( see 13.‘; );
d) Drum number;
g) Resistance test ( see 13.8 ); and
e) Size of the conductor; h) Galvanizing test ( see 13.9 ).
f) Length of the conductor;
13.1.3 Routine Tests
g) Gross weight of the drum with protec- The routine tests shall be same as acceptance
tive lagging including conductor;
tests and shall be carried out on each coil.
h) Weight of empty drum wiih protective
lagging; 13.1.4 Selections of Test Samples for Type Tests
j> Net weight of the conductor; For the purpose of type tests samples shall be
k ) Arrow marking for unwinding; and taken from a continuous length of conductor
and subjected to all the tests specified in
m j Position of the conductor end. 13.1.1.

12.2.1 The conductors may also be marked 13.1.5 Selection of Test SawpIes for Acceptance
with the Standard Mark. Tests
13.1.5.1 For ;he purpose of acceptance tests
13 TESTS samples of individual wires shall normally be
taken by the manufacturer before stranding,
13.1 Classification of Tests from the outer ends of not less than 10 percent
of wire coils and subjected to the tests speci-
13.1.1 Type Tests fied in 13.1.2

The following shall constitute the type tests: 13.1.5.2 Alternately, if desired by the purcha-
ser at the time of placing an order that the
a) Visual examination ( see 13.2 ); tests be made in the presence of this represent-
ative, samples shall than .be obtained by cut-
b) Measurement.of diameters of individual ting 1.2 metres from the outer end of the
aluminium and steel wires ( see 13.3 ); finished conductor from not more than 10
percent of the finished reels or drums. If
c>(Measurement
see 13.4 );
of lay ratio of each layer
there is more than one length on any reel or
drum, the sample shall be taken from the outer
d) Breaking load test ( see 13.5 ); length.
0 Ductility test ( see 13.6 );
13.1.5.3 Coils oflered for inspection Fhall be
f) Wrapping test ( see 13.7 );. divided into equal lots, the number of lots
being equal to the number of samples lo be
g) Resistance test ( see 13.8 ); selected a fraction of a lot being coupted as a
complete lot. One saniple coil shall be selected
h) Galvanizing test ( see 13.9 ); at random from each lot.
j> Surface condition test ( see 13.10 );
13.2 Visual Examination
k ) Corona test ( see 13.11 ); and
The conductor shall be examined visually for
m ) Radio interference voltage test ( see good workmanship and general surface finish
13.12 ) of the conductor.

5
IS 398 ( Part 5 ) : 1992

13.3 Measurement of Diameters of Individual 13.6.1 Torsion Test

Aluminium Steel wires One specimen cut from each of the samples
taken under 13.1.5.1 and 13.1.5.2 shall be
The diameter of individual aluminium and gripped at its ends in two vices, one of which
steel wire shall be checked as per the require- shall be free to move longitudinally during the
ments specified in 8.1. test. A small tensile load not exceeding 2
percent of the breaking load of the wire, shall
13.4 Measurement of Lay Ratio be applied to the sample during testing. The
The lay ratios of each layer of the conductor specimen shall be twisted by causing one of
shall be measured and checked as per the the vices to revolve until fracture occurs and
requirements specified in Table 4. the number of twists shall be indicated by a
counter or other suitable device. The rate of
13.5 Breaking Load Test twisting shall not exceed 60 rev/min.

13.5.1 Breaking Load Test on Complete When tested before stranding, the number of
Conductor complete twists before fracture occurs shall
be not less than 18 on a length equal to 100
This test shall be carried out for the purpose times the diameter of the wire. The primary
of type tests only. A sample of complete fracture shall show a smooth surface at right
conductor having a minimum length of 5 angles to the axis of the wire. Any secondary
metres with compression type dead-end clamps fracture shall be ignored.
compressed at both ends SO as to permit the
sample to take its normal straight line shape, When tested after stranding, the number of com-
shall be fixed to a suitable tensile testing plete twists before fracture occurs shall be not
machine. less than 16 on a length equal to 100 times the
diameter of the wire. The fracttire shall show
13.5.1.1 An axial load shall be applied gradually a smooth surface at right angles to the axis of
and held for about 10 seconds at a load of the wire.
5000 kg. less than the specified breaking 13.6.2 Elongation Test
load. The load shall then be raised in steps
of 500 kg. and held for about 10 seconds at The elongation of one specimen out fram each
each step until fracture occurs. The fracture of the samples taken under 13.1.5.1 or 13.1.5.2
shall not be below the breaking load specified shall be determined. The specimen shall be
in Table 3. straightened by hand and an original gauge
length of 200 mm shall be marked on the wire.
13.5.2 Breaking Load Test on Individual Wires A tensile load shall be applied as described in
12.5.2.1 and the elongation shall be measured
For the purpose of acceptance tests this test after the fractured ends have been fitted to-
shall be made on both aluminium aiid galvani- gether. If the fracture occurs outside the
zed steeI wires. gauge marks, or within 25 mm of either mark
and the required elongation,is not obtained,
13.5.2.1 The breaking load of one specimen the test shall be disregarded and another test
out from each of the sample taken under 13.5.1 made. When tested before stranding the
and 13.1.5.2 shall be determined by means of elongation shall be not less than 4 percent.
of a suitable tensile testing machine. The When tested after stranding, the elongation
load shall be applied gradually and the rate shall be not less than 3.5 percent.
of separation of the jaw of the testing machine
shall be not less than 25 mm/min and not 13.7 Wrapping Test
greater than 100 mm/min.
This test shall be made on both aluminium and
The ultimate breaking load of the specimens galvanized steel wires.
shall be not less than the appropriate value 13.7.1 Aluminium Wires
specified in Tables 1 and 2.
One specimen cut from each of the samples of
13.6 Ductility Test aluminium wire taken under 13.1.5.1 or 13.1.5.2
shall be wrapped round a wire of its own dia-
For the purpose of ductility test both torsion meter to form a close helix of 8 turns. Six
test and elongation test shall be carried out turns shall then be unwrapped and again closely
on galvanized steel wires only by the proce- wrapped in the same direction as before. The
dures given in 13.6.1 and 13.6.2. wire shall not break or show any crack.

6
 IS 398 ( Part 5 ) : 1992

NOTE - Slight surface cracks shall not constitute to get out of place or disturb the longitudinal
cause for rejection. smoothness of the conductor. The measured
diameter at any place shall be not less than the
13.7.2 Galvanized Steel Wires
sum of the minimum specified diameters of the
One specimen cut from each of the samples of individual aluminium and steel stl:ands as given
galvanized steel wire taken under 13.1.5.1 or in Tables 1 and 2.
13.1.5.2 shall be wrapped round a mandral of 13.11 Corona Test
diameter equal to 4 times the wire diameter to
form a close helix of 8 turns. Six turns shall For 400 kV
then be unwrapped and again closely wrapped Two samples of conductor of 5 m length shall be
in the same direction as before. The wire shall strung with a spacing of 450 mm between them,
not break. shall be subject to 50 Hz phase to earth voltage.
The stringing height of the bundle for the
13.8 Resistance Test purpose of this test shall be such that the
This test shall be made on aluminium wires minimum clearance’ to ground is not more than
only. The electrical resistance of one speci- S-84 m. The corona control rings shall be so
men of aluminium wire cut from each of the selected that they shield the insulators strings
samples taken under 13.1.5.1 or 13.1.5.2 shall be and hardware fittings only and do not provide
measured at ambient temperature. The mea- shielding for the conductor bundle.
sured resistance shall be corrected to the value For & 500 kV DC
at 20’ C by means of the formula:
I
Quadbundle conductors of maximum 5 m
R,o = RT 7 + tL ( T _ 3) ) length shall be strung with a spacing of 457 mm
between them, sample shall be subjected to
where dc voltage. The stringing height of the cond-
R,,, = resistance corrected at 20°C; uctors for the purpose of this test shall be such
Rr = resistance measured at TOC; that minimum clearance from ground is not
more than 7 m ( surface gradient 22 kV/cm )
u = constant-mass temperature co- under dry condition. The corona control rings
eflicient of resistance 0.004; shall be so selected that they shield insulator
T = ambient temperature during strings and hardware fittings only and do not
measurement. provide shielding for the conductor bundles.

The resistance corrected at 20°C shall be not For 800 kV

more than the maximum value specified in Quadbundle conductors of minimum 5 m shall
Table 1. be strung with a spacing of 457 mm between
them, shall be subjected to 50 Hz voltage. The
13.9 Galvanizing Test
stringing height of conductor for the purpose
This test shall be made on galvanized steel wires of this test shall be such that the minimum
only. clearance from ground is not more than 12.5 m.
The corona control rings shall be so selected
13.9.1This test shall be made on one specimen that they shield the insulator strings and hard-
cut from each of the samples of galvanized ware fittings only and do not provide shielding
steel wires taken under 13.1.5.1 or 13.1.5.2. for the conductor bundles.
13.9.2 The uniformity of galvanizing and the 13.11.1 The specimen shall have a corona
weight of coating shall be in accordance with extinction voltage with or without corona rings
IS 4826 : 1979. of not less than the following values:
Line Corona No. of Bundle Height
13.10 Surface Condition Test
Voltage Extinction Sub- Spacing Above
A sample of the finished conductor fo’r use in Voltage Condu- Ground
400 kV system and above having a minimum ctor in
recommended length of 5 metres with compre- ( rms ) Bundle
ssion type dead end clamps compressed on 400 kV ac 320 kV( rms ) 214 45 cm 8.8 m
both ends in such manner as to permit the con-
ductor to take its normal straight line shape, f500 kV 550 kV (line 4 45.7 cm 9.7 m
shall be subjected to a tension of 50 percent of dc to ground )
the UTS of the conductor. The surface shall ( surface grad-
not depart from its cylindrical shape nor shall ient 22 kV/cm )
the strands move relative to each other so as 800 kVac 610 kV ( rms ) 4 45.7 cm 12.5 m

7
1!5398(Part5):1992

13.11.1.1 There shall be no evidence of corona shall have a radio interference levels below
at any point of the sample. The correspond- 1 000 micro volts at 1.0 MHz.
ing corona inception voltage shall also be
NOTE - During the test corona control rings shall
measured. be used at both ends of the conductor. The dist-
ance betv.een the two corona control rings shall not
13.12 Radio Interference Voltage Test be fess than 5 metres and the tip of the rings shall
not project beyond 75 mm from the crimped position
of the conductor.
Under the conditions specified in the corona
test, the conductor shall be subjected to the 14 REJECTION AND RETESTS
following voltages ( line to ground ) under dry
condition: 14.1 Should any one of the test pieces first
selected fail to pass the tests, three further
System RIV Test Radio Interference
samples from the same batch shall be selected,
Voltage Voltage. Values Across 300 one of which shall be from the length from
R Resistor at 1 which the original test sample was taken unless
MHz that length has been withdrawn by the supplier.
400 kV ac 305 kV ( rms ) Max 1 000 PV
14.2 Should all the three test pieces from these
f500 kV dc 550 kV (surface additional samples satisfy the requirements of
gradient Max 1000 ,V
the test, the batch represented by these sam-
22 kV/cm ) ples shall be deemed to comply with the
800 kV ac 510 kV Max 500 PV standard. Should the test pieces from any of
the three additional samples fail, the batch
The test shall be carried out as per the proce- represented shall be deemed not to comply with
dure given in IS 8263 : 1976. The conductor the standard.

ANNEX A
( Clause 2.1 )
LIST OF REFERRED INDIAN. STANDARDS

IS No. Title IS No. Title

209 : 1979 Zinc ( third revision ) 4826 : 1979 Hot-dipped galvanized coat-
398 Aluminium conductors for ings on round steel wires (first
( Part 2 ) : 1976 overhead transmission pur- revision )
poses : Part 2 Aluminium
conductors galvanized steel 5484 : 1978 Autoclaved cellular concrete
reinforced ( second revision ) blocks
1841 : 1978 EC grade aluminium rod
produced by rolling ( second 7623 : 1985 Lithium base grease for indus-
revision ) trial purposes (first revision )

ANNEX B
( Clause 6.1.1 )
CHEMICAL COMPOSITION OF HIGH CARBON- STEEL
R-l The chemical composition of high carbon steel used in the manufacture of steel wire of
ACSR conductor is given below for guidance:
Element Percentage Composition
Carbon 0.50 to 0.85
Manganese 0.50 to 1.10
Phosphorus Max 0.035
Sulphur Max 0.045
Silicon 0.10 to 0.35
Bureat~ of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious
development of the activities of standardization,‘marking and quality certification of goods and attending to
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Dot : No ETD 37 ( 3159 )

Amendments Issued Since Publication

a_
Amend No Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

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 —————— . .. ... . . . . . ..- ——...—

AMENDMENT NO. 1 SEPTEMBER 2000

TO
IS 398( PART 5 ) : 1992 ALUMINIWI CONDUCTOR
FOR OVERHEAD TRANSMISSION PURPOSES —
SPECIFICATION
PART 5 ALUMINIUM CONDUCTORS — GALVANIZED STEEL —
REINFORCED FOR EXTRA HIGH VOLTAGE ( 400 kV AND ABOVE)

(First Revikwn )

(Page 3, clmse10.5) — Add the following new clause

‘10.6 For the purpose of calculation of breaking load and resistance, stranding _——-— ... .... .... . . ---.- .. . __
constants given in Table 5 are to be used.’

Table 5 StrandingConstant

( Clause 10.6)
No. OfwkeS !Mrandillg Collstaill
in Conductor

Maaa Electrical Resistance

‘, ,
Aluminium steel Aluminium Steel
(1) (2) (3) (4) (9
42 7 43.6 7.032 0.02515

54 7 55.458 7.035 0.026 3S

(Page 4, Table3,CO13 )– Substitute ‘~~.so’ for ‘71MY.

( ETD 37 )

Reprography Uni4 BIS, New Delhi, India