©
© B
BII S
S 20
2004
04
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B U
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M A N A K
M A N A K BHAVAN
BHAVAN
,,
9
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BAHADUR
BAHADUR SHAH
SHAH ZAFAR
ZAFAR MARG
MARG
N
N E
E W
W D E L H I
D E L H I
110002
110002
(R
(Reaeaffirffirmemedd 1199999)9)
Edition 2.3
Edition 2.3
(1989-03)
(1989-03)
Pr
Price
ice Gr
Gro
oup 5
up 5
II n d i
n d i a n
a n S
St a
t an d a r d
n d a r d
D
DII ME
ME NS
NSII O
ONS
NS F
FO
OR PO
R PORC
RCEL
EL AI
AI N
N
T
TRA
RAN
NSF
SFORM
ORM E
ER BU
R BU SH
SHII N
NGS
GS F
FOR U
OR USE
SE II N
N
L
L II G
GHTL
HTL Y P
Y P O
OL
L L
L UTED AT
UTED ATMO
MOS
SPHE
PHE R
RES
ES
PA
PART II
RT II
3
3..6
6 k
kV B
V BU
US
SHI
HIN
NG
GS
S
S
Se
ect
ctio
ion 2
n 2 Me
Metta
al Pa
l Part
rts
s
(
( F
F ii rr s
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s. 1, 2 & 3)
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8.6
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4.2
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1
Reaffirmed 2004
Reaffirmed 2004
©
© BBII S 2004S 2004 BURE
BURE AU OF IAU OF I NDIAN SNDIAN STANDATANDARDSRDS T
This his pupubbliliccatation ion is is proproteteccteted d undundeer r thethe I nI n d i a n d i a n C oC op y r i g h t A c t p y r i g h t A c t (XI (XI V V oof 19f 195757) and) and
II n d i
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an S
n St a
t an d a r d
n d a r d
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NSII O
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SFORM
ORM E
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SHII N
NGS F
GS FOR U
OR USE
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L II G
GHTL
HTL Y PO
Y POL
L L
L UTED A
UTED ATMO
TMOS
SPHE
PHE R
RES
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PA
PART
RT II
II
3
3..6
6 k
kV
V B
BUS
USHIN
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TDC
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3
CChh aaii rr mm aann RR eepprr eesseenn tt ii nn gg
S
SHHRIRI L L . C. . C. JJAIAI NN MinMinistristry oy of Ef Enenergy, rgy, NNeew Dew Delhlhii
M
M eemm beberr s s
S
SHHRIRI V. R. A V. R. ANANTHANARAYANANNANTHANARAYANAN BengBengal Pal Poottetteririees Ls Ltd, Calcuttatd, Calcutta
S
SHRHR II C CHANDERHANDER P PARKASHARKASH ( (A l t e r n a t e A l t e r n a t e ) ) S
SHHRIRI B. C. B B. C. BANEANERJRJ EEEE AlAll l II ndia Pndia Poottetterry My Manufacanufacturtureers’ rs’ AssoAssocciatiiatioon,n,
Calcutta Calcutta S
SHRHR II B. C. D B. C. DAWAW ( (A l t e r n a t e A l t e r n a t e ) )
S
SHHRIRI D. S. C D. S. CHABHALHABHAL Directorate General of Technical Development,Directorate General of Technical Development,
N
Neew Dew Delhlhii S
SHHRIRI R. T. C R. T. CHARIHARI Tag Tag CoCorporporatioration, n, MMadadrasras
S
SHRHR II A. A. GGURUPATHAMURUPATHAM ( (A l t e r n a t e A l t e r n a t e ) ) S
SHHRIRI K K . S. . S. CCHELLAPPANHELLAPPAN T Tamamil Nil N adadu Elu Eleecctritriccity ity BoBoardard, , MMadadrasras
S
SHRHR II N. R. S N. R. SANKARANANKARAN ( (A l t e r n a t e A l t e r n a t e ) )
S
SHHRIRI A. K A. K. C. CHOPRAHOPRA Punjab State Electricity Board, PatialaPunjab State Electricity Board, Patiala
S
SHRHR II N NIRVAIRIRVAIR S SINGHINGH ( (A l t e r n a t e A l t e r n a t e ) ) S
SHHRIRI A. N. D A. N. DEBEB DamodaDamodar r ValValley Corpoley Corporatiratioon, Cn, Calcuttaalcutta
S
SHRHR II A. C. B A. C. BOSEOSE ( (A l t e r n a t e A l t e r n a t e ) ) D
DIRECTORIRECTOR OFOF R RESEARCHESEARCH (T & D) (T & D) MaMahahararasshhtra tra StStaate te EleElecctritriccitity y BoBoaardrd, B, Boommbbaayy
D
DIRECTORIRECTOR ( (TTRACTIONRACTION ANAN DD
IINSTALLATIONNSTALLATION))
Research, Designs & Standards Organization, Research, Designs & Standards Organization,
M
Miniinistry ostry of Rf Railwayailways, Ls, Lucucknoknoww J
JOINTOINT D DIRECTORIRECTOR S S TA TA NDANDARDSRDS (T (T11))
((A l t e r n a t e A l t e r n a t e ) )
D
DIRECTORIRECTOR ( (TTRANSMISSIONRANSMISSION)) CCeennttrraal El Elleeccttrriicciitty y AAuutthhoorriittyy, , NNeew w DDeellhhii
D
DEPUTYEPUTY D DIRECTORIRECTOR ( (SSUBSTATIONUBSTATION))
((A l t e r n a t e A l t e r n a t e ) )
(Conti nu ed from page 1 )
M em ber s R epr esen t i n g
GENERAL MANAGER (T)
DIRECTOR OF TELEGRAPHS (L )
( A l t e r n a t e )
DIVISIONAL ENGINEER TEL E -GRAPHS (C) (A l t e r n a t e )
Director General of Posts & T elegraphs, J abalpur
SHR I B. N. GHOSH Bharat Heavy Electricals L td, Bhopal
SHR I H . M. S. LINGAIAH K arnataka E lectricity Board, Bangalore
SHR I G. S. MAHAGAONKAR Mysore Porcelains L td, Bangalore
SHR I S. K. MU K H E RJ E E
SHR I U . S. VERMA (A l t e r n a t e )
National Test House, Calcutta
DR G. M. PHADKE
SHR I C. R. VARRIER (A l t e r n a t e )
I ndian E lectrical Manufacturers’ Association, Bombay
SHR I P. S. RAMAN
SHR I E . P. WILFRED (A l t e r n a t e )
NGEF L imited, Bangalore
SHR I M. SANKARALINGAM
D Y DIRECTOR OF INSPECTION
( A l t e r n a t e )
Directorate General of Supplies & Disposals, New Delhi
SHR I P. K. SAXENA
SHR I G. L. DUA (A l t e r n a t e )
Rural Electrification Corporation L imited, New Delhi
SHR I N. S. SEETHURAMON
SHR I V. SRINIVASAN (A l t e r n a t e )
W. S. I nsulators of I ndia Ltd, Madras
DR U. S. SINGH
SHR I A. D. DUA (A l t e r n a t e )
High Tension I nsulator F actory, Ranchi
SHR I SURENDRA SINGH U. P. Government Pottery Development Centre,
Khurja SHR I T. B. L . SRIVASTAVA (A l t e r n a t e )
SHR I L. VENKATESUBBU
SHR I R. V. ACHUTHAN (A l t e r n a t e )
Seshasayee Industries L td, Vadalur South Arcot, District
SHR I S. P. SACHDEV,
Director (Elec tech)
Director General, I SI (Ex-offi cio M em ber )
Secretary
SHRI R. S. SARMA
Assistant Director (Elec tech), I SI
Panel for Dimensions of Bushings, ETDC 3 : P3
ConvenerSHR I V. SRINIVASAN W. S. I nsulators of I ndia Ltd, Madras
M em ber s
SHR I K . N. J AYARAM Mysore Porcelains L td, Bangalore
SHR I S. V. MANERIKAR Crompton Greaves L td, Bombay
SHR I M. L. MITTAL Bharat Heavy Electricals L td, Bhopal
SHR I S. P. SINGH (A l t e r n a t e )
SHR I R. G. PRADHANANI Bharat Bijlee L td, Bombay
SHR I P. RAMACHANDRAN Transformers & Electricals K erala L td,
Angamally South P. O. SHR I K URIAKOSE ANTONY (A l t e r n a t e )
SHR I P. S. RAMAN NGEF L imited, Bangalore
DR U. S. SINGH High Tension I nsulator F actory, Ranchi
I n d i a n St an d a r d
DI ME NSI ONS FOR PORCEL AI N
TRANSFORM ER BU SHI NGS FOR USE I N
L I GHTL Y P OL L UTED ATMOSPHE RES
PART II
3.6 kV BUSHINGS
Section 2 Metal Parts
( F i r st Revi si on )
0.
F O R E W O R D
0.1
This Indian Standard (Part I I /Sec 2) (First Revision) was adopted
by the Indian Standards Institution on 29 August 1979, after the draft
finalized by the Electrical I nsulators and Accessories Sectional
Committee had been approved by the Electrotechnical Division
Council.
0.2
This standard was first issued in 1967. This revision has been
undertaken with a view to including details of fixing arrangements of
jumpers at oil end. This revision also incorporates amendment issued
to the original standard.
0.3
The dimensions of porcelain parts of the bushings for use in lightly
polluted atmospheres of 3.6 kV are covered in I S : 3347 (Part I I /Sec
1)-1979*. This section (Section 2), which is a necessary adjunct to
Section 1, lays down the dimensions of the metal parts and accessories
of the bushings to go with the porcelain parts specified in Section 1.
The materials of the metal parts have also been specified.
0.4
The need for changing over to aluminium for the metal parts of
bushings has been fully recognized. This section, therefore, includes
complete sets of dimensions of parts using aluminium as well as
copper. Dimensions for copper parts have been given to ensure a
smooth changeover to aluminium. These are expected to be deleted in
due course.
0.5
I n this section, the dimensions of metal parts have been
formulated in such a way that the porcelain parts available in
Section 1 of this standard may be used both for aluminium as well as
copper metal parts. Suitable references are given to indicate the
appropriate porcelain part at each place.
0.6
For a current rating of 3 150A, no aluminium metal parts have
been specified. I n this case the use of copper metal parts only is
recommended.
*Dimensions for porcelain transformer bushings for use in normal and lightly polluted atmospheres : Part I I 3.6 kV bushings, Section 1 Porcelain parts (fi rst revision ).
0.7
The dimensions of bushings for other voltages are covered by the
following parts of this standard:
Part I Up to and including 1 kV
Section 1 Porcelain parts
Section 2 Metal parts
Part II I 12 and 17.5 kV Bushings
Section 1 Porcelain parts
Section 2 Metal parts
Part I V 24 kV Bushings
Section 1 Porcelain parts
Section 2 Metal parts
Part V 36 kV Bushings
Section 1 Porcelain parts
Section 2 Metal parts
Part VI 72.5 kV Bushings
Section 1 Porcelain parts
Section 2 Metal parts (
un der prepar ati on
)
Part VI I 123 kV Bushings
Section 1 Porcelain parts
Section 2 Metal parts (
un der prepar ati on
)
0.8
The dimensions for porcelain transformer bushings for use in
heavily polluted atmospheres are covered by IS : 8603 ( Parts I to I I I
)-1977*. The metal parts covered by this section may be used for bushings
covered by IS : 8603 (Parts I to II I )-1977*.
0.9
I n the preparation of this standard, assistance has been derived
from DI N 42539 (1968) ‘I ndoor and outdoor transformers, bushings
voltage rating 3 kV for 250 to 3 150A’, issued by Deutscher
Normenausschuss.
0.10
This edition 2.3 incorporates Amendment No. 1 (J une 1982),
Amendment N o. 2 (April 1987) and Amendment N o. 3 (March 1989).
Side bar indicates modification of the text as the result of incorporation
of the amendments.
0.11
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, shall be rounded off in accordance with
I S : 2-1960†. The number of significant places retained in the rounded
off value should be the same as that of the specified value in this
standard.
*Dimensions for porcelain transformer bushings for use in heavily polluted atmospheres:
Part I 12 and 17.5 kV bushings, Part II 24 kV bushings, and Part I I I 36 kV bushings.
1. SCOPE
1.1
This standard (Part I I /Sec 2) lays down the dimensions and
materials of metal parts and accessories of 3.6 kV rating bushings
used with transformers for use in lightly polluted atmospheres.
2. MATERI ALS
2.1
The materials of various parts shall conform to the relevant Indian
Standards specified below:
*Specification for precision and semi-precision hexagon bolts, screws, nuts and lock nuts (diameter range 6 to 39 mm) (fir st r evision ).
†Specification for copper rods for electrical purposes (r evi sed ). ‡Specification for aluminium ingots (EC grade) (fir st r evision ). §Specification for brass bars, rods and sections suitable for forging.
| |Specification for brass ingots and castings (r evi sed ).
¶Specification for free-cutting brass bars, rods and sections (t h i r d r ev i si o n ). M et a l P a r t o r A ccessor y F or B u sh i n g w i t h Copper St em F or B u sh i n g w i t h A l u m i n i u m S t em
Hexagonal nut (4.1)
Brass conforming to
2.2
of I S : 1364-1967*
Aluminium alloy
confor-ming to
2.2 of IS :
1364-1967*
Stem (3.2)
Copper rods conforming
to I S : 613-1964†
Aluminium conforming to
electrical
grade
of
I S : 4026- 1969‡ or any
other suitable
alumi-nium alloy to be agreed
between
manufacturer
and the purchaser
Nut (3.3)
Brass conforming to
I S : 3488-1966§
or
Grade 2 of I S :
292-1961
| |or
I S :
319-1974¶
Aluminium conforming to
electrical grade of I S :
4026-1969‡ or any other
suitable aluminium alloy
to be agreed between
manufacturer and the
purchaser
Washer (top end) (
3.5) Brass conforming to
Type I of I S :
319-1974¶ or I S :
3488-1966§
—do—
Washer (stem) (3.6)
Brass conforming to
Type I of I S :
319-1974¶ or I S :
3488-1966§
NOTE — F or 250 A rated bushing, brass conforming to I S : 3488-1966† may be used for manufacture of stem in place of copper rod.
2.2
The material used for sealing washers for general purposes (four
types
M
,
N
,
P
and
Q
) shall be synthetic rubber or synthetic rubber
bonded cork. The material used for sealing washers for stem shall be
synthetic rubber (acrylic nitrile rubber) having hardness of 70 ±
5 I RHD. Where synthetic insulating transformer coolant is used, the
material of the washer shall be silicone rubber or any other resilient
material compatible with the transformer coolant.
3. DIMENSIONS
3.1
The hexagonal nuts used shall conform to I S : 1364-1967§ and
I S : 3138-1966
| |. The threads shall be in accordance with
I S : 1362-1962¶ and IS : 3139-1966
**
.
3.2 Stem
3.2.1
For
3.6
/
250 a n d 6 3 0 R a t i n g
(
Copper Stem
)
and for 3.6
/
250
R a t i n g
(
A l u m i n i u m S tem
) — The dimensions shall conform to Fig. 1.
3.2.2
For 3.6
/
1 000 , 2 000 an d 3 150 R at i n g
(
Copper St em
)
and for
3.6
/
6 30 , 1 0 00 a n d 2 0 00 R a t i n g
(
A l u m i n i u m S t e m
) — The
dimensions shall conform to Fig. 2.
M et a l P a r t o r A ccessor y F or B u sh i n g w i t h Copper St em F or B u sh i n g w i t h A l u m i n i u m S t emConnecting lug
For 1 000 and 2 000 A
brass conforming to
Grade 3 of I S :
292-1961* or to I S :
3488-1966†
For 3 150 A copper
chromium alloy
Aluminium
alloy
conforming
to
A-6-M
designation of I S :
617-1975
‡
or any other
suitable aluminium alloy
to be agreed between the
manufacturer and the
purchaser
*Specification for brass ingots and castings ( revised ).
†Specification for brass bars, rods and sections suitable for forging.
‡Specification for aluminium and aluminium alloy ingots and castings for general engineering purposes (secon d r evi sion ).
§Specification for precision and semi-precision hexagon bolts, screws, nuts and lock nuts diameter range 6 to 39 mm (fi rst r evision ).
| |Specification for hexagonal bolts and nuts (M 42 to M 150).
¶Dimensions for screw threads for general purposes (diameter range 1.6 to 39 mm) (r evi sed ).
3.3 Nut
3.3.1
For 3.6
/
250 and 630 Rating
(
Copper Stem
)
and for 3.6
/
250
R a t i n g
(
A l u m i n i u m S tem
) — The dimensions shall conform to Fig. 3.
3.3.2
For 3.6
/
1 00 0 R at i n g
(
Copper Stem
)
and 3.6
/
6 3 0 R a t i n g
(
A l u m i n i u m S t em
) — The dimensions shall conform to Fig. 4.
3.3.3
For 3.6
/
2 000 an d 3 1 50 Ra ti n g
(
Copp er St em
)
and for 3.6
/
1 000,
2 0 00 R at i n g
(
A l u m i n i u m S tem
) — The dimensions shall conform to
Fig. 5.
3.4 Stem Subassembly
3.4.1
For 3.6
/
250 and 630 Ratin g
(
Copp er St em
)
and for 3.6
/
250 an d
6 30 R a t i n g
(
Copper St em
)
and for 3.6
/
2 50 R a t i n g
(
A l u m i n i u m S t em
)
— The subassembly shall conform to Fig. 6.
3.4.2
For 3.6
/
1 000, 2 00 0 a n d 3 150 Ra ti n g
(
Copper Stem
)
an d
3.6
/
6 30 , 1 0 00 an d 2 0 00 R at i n g
(
A l u m i n i u m S t e m
) — The
subassembly shall conform to Fig. 7.
3.5 Washer (Top End)
— The washer (top end) shall conform to
Fig. 8.
3.6 Washer (Stem) —
The washer (stem) shall conform to Fig. 9.
3.7 Sealing Washers
3.7.1
For Stem
— The sealing washer for stem shall conform to Fig. 10.
3.7.2
Gen er al Pu r pose
(
four T ypes M , N, O and P
) — The general
purposes sealing washer shall be in accordance with Fig. 11.
3.7.3
Gasket
(
R a n d X T y p e
) — T he gasket shall conform to Fig. 12.
3.8 Connecting Lug
— The connecting lug shall conform to Fig. 13.
4. TOLERANCES
4.1
Unless otherwise specified allowable tolerance on a dimension of
any machined metal part shall be in accordance with medium class of
I S : 2102-1969*.
4.2
Unless otherwise specified, allowable tolerance on a dimension of
any forged or cast metal part shall be in accordance with coarse class
of I S : 2102-1969*.
5. ASSEMBL Y
5.1
The assembly of the bushing is shown in Fig. 14.
*Specification for allowable deviations for dimensions without specified tolerances (fi r st r evi sion ).
NOTE — T he chamfered ends shall be in accordance with I S : 1368-1967* and f and x shall be in accordance with I S : 1369-1975†.
T Y PE OF S TE M BUSHINGRATING kV/A CORRESPONDING RATING OF PORCELAIN PART OF SEC 1, kV/A d 1 l 1 l 2 l 3 (1) (2) (3) (4) (5) (6) (7) Copper and aluminium 3.6/250 3.6/250 M 12 272 71 38.5 Copper 3.6/630 3.6/630 M 20 318 100 53
*Dimensions of ends of bolts and screws ( f irst r evi sion ).
†Dimensions of screw threads run out and undercuts (f ir st r evi sion ).
F
I G. 1 S
TE M F OR250
AND630A R
ATINGT Y PE OF S TE M BUSHINGRATING kV/A C ORRESPONDING RATING OF PORCELAIN PART OF SEC 1, kV/A d 1 d 13 c 8 l 1 l 2 l 3 (1) (2) (3) (4) (5) (6) (7) (8) Aluminium Copper Aluminium Copper Aluminium Copper 3.6/630 3.6/1 000 3.6/1 000 3.6/2 000 3.6/2 000 3.6/3 150 3.6/1 000 3.6/1 000 3.6/2 000 3.6/2 000 3.6/3 150 3.6/3 150 M 30 × 2 M 30 × 2 M 42 × 3 M 42 × 3 M 48 × 3 M 48 × 3 29 29 41 41 47 47 300 300 340 340 353 353 110 110 140 140 148 148 24 24 29 29 34 34 NOTE —f and x shall be in accordance with I S : 1369-1975*.
*Dimensions of screw threads run out and undercuts (fi r st r evi sion ).
T Y PE OF S TE M BUSHINGRATING kV/A C ORRESPONDING RATING OF PORCELAIN PART OF SEC 1, kV/A d 14 d 15 d 16 M ax h 7 l 3 M ax (1) (2) (3) (4) (5) (6) (7) (8) Aluminium Copper Copper 3.6/250 3.6/630 3.6/250 3.6/630 M 12 M 20 45 63 24 39 15 18 19 27
F
I G. 3 N
UT FOR250
AN D630A R
ATINGT Y PE OF S TE M BUSHING RATING kV/A CORRES -PONDING RATING OF PORCELAIN PART OF SEC 1, kV/A d 17 H 8 d 18 M ax d 19 M ax h 8 h 9 ±0.3 d 4 M ax l 6 (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) Aluminium Copper Aluminium Copper 3.6/1 000 3.6/2 000 3.6/2 000 3.6/3 150 3.6/2 000 3.6/2 000 3.6/3 150 3.6/3 150 41 41 47 47 62 62 78 78 56 56 66 66 34 34 39 39 27 27 32 32 50 50 60 60 100 100 110 110
T YP E OF S TE M BUSHING RATING kV/A CORRESPONDING RATING OF PORCELAIN PART OF SEC 1, kV/A l 4±0.3 S TE M NUT (1) (2) (3) (4) (5) (6) Copper and Aluminium Copper 3.6/250 3.6/630 3.6/250 3.6/630 25 37 See F ig. 1 See F ig. 1 See Fig. 3 See Fig. 3
T Y PE OF S TE M BUSHING RATING kV/A CORRESPONDING RATING OF PORCELAIN PART OF SEC 1, kV/A l 5 S TE M NUT (1) (2) (3) (4) (5) (6) Aluminium Copper Aluminium Copper Aluminium Copper 3.6/630 3.6/1 000 3.6/1 000 3.6/2 000 3.6/2 000 3.6/3 150 3.6/1 000 3.6/1 000 3.6/2 000 3.6/2 000 3.6/3 150 3.6/3 150 307 307 347 347 360 360 See F ig. 2 See F ig. 2 See F ig. 2 See F ig. 2 See F ig. 2 See F ig. 2 See Fig. 4 See Fig. 4 See Fig. 5 See Fig. 5 See Fig. 5 See Fig. 5
BUSHING RATING
kV/A
BUSHING WITH ALUMINIUM S TE M BUSHING WITH COPPER S TE M
d 2 d 20 d 21 h 10 t d 2 d 20 d 21 h 10 t (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) 3.6/250 3.6/630 3.6/1 000 3.6/2 000 3.6/3 150 28 56 70 80 — 13 31 43 50 — 22 45 59 65 — 20 24 26 26 — 1.5 3 3 3 — 28 40 56 70 80 13 21 31 43 50 22 32 45 59 65 20 22 24 26 26 1.5 2 3 3 3
F
I G. 8 W
ASHER(T
OPE
ND)
BUSHING RATING kV/ABUSHING WITH ALUMINIUM S TE M BUSHING WITH COPPER S TE M
d 22 d 23 d 24 d 25 h 11 d 22 d 23 d 24 d 25 h 11 (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) 3.6/250 3.6/630 3.6/1000 3.6/2000 3.6/3150 28 56 70 80 — 13 31 43 50 — 22 45 59 65 — 32 65 80 100 — 4 6 7 8 — 28 40 56 70 80 13 21 31 43 50 22 32 45 59 65 32 47 65 80 100 4 5 6 7 8
F
I G. 9 W
ASHER(S
TE M)
BUSHING RATING
kV/A
BUSHING WITH ALUMINIUM
S TE M
BUSHING WITH COPPER
S TE M d 28±0.3 d 29 S 1 d 28±0.3 d 29 S 1 (1) (2) (3) (4) (5) (6) (7) 3.6/250 3.6/630 3.6/1 000 3.6/2 000 3.6/3 150 22 45 59 65 — 12 30 42 48 — 11 16 18 18 — 22 32 45 59 65 12 20 30 42 48 11 13 16 18 18
F
I G. 10 S
EALINGW
ASHER FORS
TE MT YP E BUSHING RATING
kV/A
BUSHING WITH ALUMINIUM
S TE M
BUSHING WITH COPPER
S TE M d 30 d 31 S 2 d 30 d 31 S 2 (1) (2) (3) (4) (5) (6) (7) (8) M M M M M N N N N N P P O O 3.6/250 3.6/630 3.6/1 000 3.6/2 000 3.6/3 150 3.6/250 3.6/630 3.6/1 000 3.6/2 000 3.6/3 150 3.6/250 3.6/630 3.6/250 3.6/630 32 65 80 100 — 60 90 104 125 — 45 — 60 — 14 32 45 50 — 38 56 70 90 — 25 — 38 — 2 2 2 2 — 4 4 4 4 — 2 — 2 — 32 47 65 80 90 60 70 100 104 125 45 63 60 70 14 22 32 45 50 38 45 56 70 90 25 40 38 45 2 2 2 2 2 4 4 4 4 4 2 2 2 2
F
I G. 11 G
ENERALP
URPOSEW
ASHER(F
OURT
Y PESM
,
N
,
O
ANDP
)
T YP E RATING
kV/A
BUSHING WITH ALUMINIUM
S TE M
BUSHING WITH COPPER
S TE M d 26 d 27 T d 26 d 27 T (1) (2) (3) (4) (5) (6) (7) (8) R R R R R X X X X X 3.6/250 3.6/630 3.6/1 000 3.6/2 000 3.6/3 150 3.6/250 3.6/630 3.6/1 000 3.6/2 000 3.6/3 150 45 56 70 90 — 40 45 63 80 — 70 90 104 125 — 70 70 90 110 — 3 3 3 3 — 3 3 3 3 — 28 40 45 70 90 25 45 56 70 90 50 70 70 104 125 50 70 90 104 125 3 3 3 3 3 3 3 3 3 3
F
I G. 12 G
ASKET(
R
ANDX
T
Y PE)
BUSHING
RATING
kV/A
WI TH ALUMINIUM S TE M
C D 1 D 2 D 20 G H 11 H 12 H 13 S W N T P Q R4 R 5 U V (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) 3.6/1 000 58 M 42 ×3 18 M 16 40 195 80 100 50 25 45 35 20 18 15 20 15 26 3.6/2 000 68 M 48 ×3 18 M 16 40 220 80 120 60 30 45 35 20 18 15 20 15 30 WI TH COPPER S TE M 3.6/1 000 45 M 30 ×2 14 M 12 30 130 60 060 32 14 30 25 12 10 10 15 10 16 3.6/2 000 58 M 42 ×3 18 M 16 40 195 80 100 50 25 45 35 20 18 15 20 15 26 3.6/3 150 68 M 48 ×3 18 M 16 40 220 80 120 60 30 45 35 20 18 15 20 15 30 FI G. 13 CONNECTING LUG
1. I nsulator (top) 2. I nsulator (bottom) 3. Stem
4. Washer (top end) 5. Washer (stem) 6. Connecting lug
7. Sealing Washer (stem)
8. Sealing washerM Type 9. General purpose washer 10. GasketX
11. GasketR
12. Washer in accordance with I S : 2016-1967† 13. N ut
14. Spri ng washer (TypeB as per I S : 3063-1972‡) T YP E OF S TE M BUSHING RATING
kV/A a M a x b M a x d 1 d 2 d 3 d 4 d 5 Aluminium 3.6/250 3.6/630 3.6/1 000 3.6/2 000 3.6/3 150 180 290 372 402 — 94 80 86 92 — M 12 ×0 M 30 ×2 M 42 ×3 M 48 ×3 — 28 56 70 80 — 39 56 70 90 — 070 110 125 150 — 075 110 125 145 — Copper 3.6/250 3.6/630 3.6/1 000 3.6/2 000 3.6/3 150 180 210 294 372 404 94 110 80 86 92 M 12 ×0 M 20 ×0 M 30 ×2 M 42 ×3 M 48 ×3 28 46 56 70 90 39 45 56 70 90 070 085 110 125 150 075 90 110 125 145 *4 to 8 up to and includi ng 1 000 A, 6 to 10 above 1 000 A.
†Specification for plain washers (fir st revision ).
‡Specification for single coil rectangular section spring washers for bolts, nuts and screws (fir st revision ).
FI G. 14 ASSEMBLY OF BUSHING
harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.
Copyright
BI S has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in wri ting of BI S. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BI S.
Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. U sers of I ndian Standards should ascertain that they are in possession of the latest amendments or edition by referri ng to the latest issue of ‘BIS Catalogue’ and ‘Standards : Monthly Additions’.
This Indian Standard has been developed by Technical Committee : ETDC 3 Amendments Issued Since Publication
Amend No. Date of Issue
Amd. No. 1 J une 1982
Amd. No. 2 April 1987
Amd. No. 3 March 1989
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