IS 3347_2_2
Short Description
Descripción: Indian standard 3347-2-2...
Description
I S : 3347 (Part (Part II I I /S /Se ec 2) 2) - 19 1979 (Rea (R eaffir ffirme med d 19 99) Reaffirmed 2004 Edition 2.3 (1989-03)
I n d i a n S t an an d a r d
DI ME NSI NSI ONS F OR PORC PORCEL EL AI N TRA T RAN N SFORM SF ORM E R BU SHI SH I N GS F OR USE U SE I N L I GHTL Y P OL L UTED ATMO ATMOS SPHE RES PART PART II
3.6 kV BU BUSHIN HINGS
Sectio ction n 2 Met Metal Part Parts s
( F i r st Revi Revi si on ) (Inco (I ncorrpor por ating ati ng Am Amendme ndment N os. 1, 2 & 3)
U DC
621.3 .31 15. 5.6 6266-2 2 : 621.3 .31 15.6 .61 12.2 : 00 006 6.7 .78 8.6 .62 21.3 .31 14.2 .21 1
©BI S 20 2004 04
BUREAU
OF
I NDI AN
ST ANDAR DS
M A N A K BHAVAN , 9 BAHADUR SHAH ZAFAR MARG N E W D E L H I 110002
Price Pr ice Gro Gr oup 5
I S : 3347 (Part (Part II I I /S /Se ec 2) 2) - 19 1979
I n d i a n St S t an an d a r d
DI ME NSI NSI ONS F OR PORC PORCEL EL AI N TR T R A N SFORM SF ORM E R BU SHI SH I N GS FOR F OR USE U SE I N L I GHTL Y POL POL L UTED ATMO ATMOS SPHE RES PART PART II
3.6 kV BUS USHIN HING GS
Section ion 2 Met Metal Part Parts s
( Fi r st Revi Revi si on ) E l ectri tr i cal I nsulato nsulatorrs and Acce Access sso or ies Sec Sectio ti onal Comm Commi tte ttee, E T DC 3 Ch ai r m an
SH RI L . C. J AI N
R ep r esen t i n g
M inistr in istry y of of Ene E nergy, rgy, N ew Delh Delhii
M em ber ber s
SH RI V. R. A NANTHANARAYANAN Bengal Bengal Po P otteri tterie es Ltd, L td, Calcutta SHR I CHANDER PARKASH ( A l t e r n a t e ) ANERJ EE SH RI B. C. B ANERJ All Al l I ndia Po P otter tter y Manufac M anufactur ture ers’ Assoc Associatio iati on, Calcutta SHR I B. C. DAW ( A l t e r n a t e ) SH RI D. S. CHABHAL Directorate General of Technical Development, N ew Delh Delhii SH RI R. T. CHARI Tag T ag Corpo Corporatio ration, n, M adras adras SHR I A. GURUPATHAM ( A l t e r n a t e ) SH RI K . S. CHELLAPPAN Tam T amil il N adu adu Ele El ectric tri city Board Board,, M adras adras SHR I N. R. SANKARAN ( A l t e r n a t e ) SH RI A. K. K . CHOPRA Punjab State Electricity Board, Patiala SHR I N IRVAIR SINGH ( A l t e r n a t e ) SH RI A. N. DEB Damoda Damodarr Valley Val ley Corporati Corporatio on, Calcutta C alcutta SHR I A. C. B OSE ( A l t e r n a t e ) DIRECTOR OF RESEARCH (T (T & D) Maha Mahara ras shtra Sta State Elec Electric tricity ity Boa Board, rd, Bo Bombay DIRECTOR (T (T RACTION AN D Research, Designs & Standards Organization, I NSTALLATION) M inistry ini stry of of Railway R ailways, s, Luc L uckno know w J OINT DIRECTOR S TA NDARDS NDA RDS (T1 (T 1) ( A l t e r n a t e ) DIRECTOR (T (T RANSMISSION) Centr al El E l ectr i ci ty A uthor i ty, N ew Del hi DEPUTY DIRECTOR (S (SUBSTATION ) ( A l t e r n a t e ) ( Conti nu ed on page 2 ) ©B I S 2004 BURE AU OF I NDIAN STANDA STANDARDS RDS This T his pub public li cation ation is prote protec cted ted unde under the I n d i a n C op (XI V of 1957 1957)) and op y r i g h t A c t reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.
IS : 3347 (Part II/Sec 2) - 1979 ( Conti nu ed from page 1 ) M em ber s
R epr esen t i n g
GENERAL M ANAGER (T) DIRECTOR OF TELEGRAPHS (L ) ( A l t e r n a t e ) DIVISIONAL E NGINEER TEL E GRAPHS (C) ( A l t e r n a t e ) SHR I B. N. GHOSH SHR I H . M. S. LINGAIAH SHR I G. S. M AHAGAONKAR SHR I S. K. M U K H E RJ E E SHR I U . S. VERMA ( A l t e r n a t e ) DR G. M. P HADKE SHR I C. R. V ARRIER ( A l t e r n a t e ) SHR I P. S. R AMAN SHR I E . P. WILFRED ( A l t e r n a t e ) SHR I M. SANKARALINGAM D Y DIRECTOR OF I NSPECTION ( A l t e r n a t e ) SHR I P. K. SAXENA SHR I G. L. DUA ( A l t e r n a t e ) SHR I N. S. SEETHURAMON SHR I V. SRINIVASAN ( A l t e r n a t e ) DR U. S. SINGH SHR I A. D. DUA ( A l t e r n a t e ) SHR I SURENDRA SINGH
Director General of Posts & T elegraphs, J abalpur
Bharat Heavy Electricals L td, Bhopal K arnataka E lectricity Board, Bangalore Mysore Porcelains L td, Bangalore National Test House, Calcutta I ndian E lectrical Manufacturers’ Association, Bombay NGEF L imited, Bangalore Directorate General of Supplies & Disposals, New Delhi Rural Electrification Corporation L imited, New Delhi W. S. I nsulators of I ndia Ltd, Madras High Tension I nsulator F actory, Ranchi
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. V ENKATESUBBU Seshasayee Industries L td, Vadalur South Arcot, SHR I R. V. A CHUTHAN ( A l t e r n a t e ) District SHR I S. P. SACHDEV, Director General, I SI ( Ex-offi cio M em ber ) Director (Elec tech) Secretary
SHRI R. S. SARMA Assistant Di rector (Elec tech), I SI
Panel for Dimensions of Bushings, ETDC 3 : P3 Convener
SHR I V. SRINIVASAN
W. S. I nsulators of I ndia Ltd, Madras
M em ber s
SHR I K . N. J AYARAM SHR I S. V. M ANERIKAR SHR I M. L. M ITTAL SHR I S. P. SINGH ( A l t e r n a t e ) SHR I R. G. P RADHANANI SHR I P. RAMACHANDRAN
Mysore Porcelains L td, Bangalore Crompton Greaves L td, Bombay Bharat Heavy Electricals L td, Bhopal
Bharat Bijlee L td, Bombay Transformers & Electricals K erala Angamally South P. O. SHR I K U RIAKOSE ANTONY ( A l t e r n a t e ) SHR I P. S. R AMAN NGEF L imited, Bangalore DR U. S. SINGH High Tension I nsulator F actory, Ranchi SHR I A. D. DUA ( A l t e r n a t e )
2
L td,
IS : 3347 (Part II/Sec 2) - 1979
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 ).
3
IS : 3347 (Part II/Sec 2) - 1979 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. †Rules for rounding off numerical values ( r evi sed ).
4
IS : 3347 (Part II/Sec 2) - 1979 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: 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 Aluminium alloy conforof I S : 1364-1967* ming to 2.2 of IS : 13641967* Stem (3.2) Copper rods conforming Aluminium conforming to to I S : 613-1964† electrical grade of I S : 4026- 1969‡ or any other suitable aluminium alloy to be agreed between manufacturer and the purchaser Nut (3.3) Brass conforming to Aluminium conforming to I S : 3488-1966§ or electrical grade of I S : Grade 2 of I S : 292- 4026-1969‡ or any other 1961| | or I S : 319- suitable aluminium alloy 1974¶ to be agreed between manufacturer and the purchaser Washer (top end) (3.5) Brass conforming to Type I of I S : 319—do— 1974¶ or I S : 34881966§ Washer (stem) (3.6) Brass conforming to Type I of I S : 319—do— 1974¶ or I S : 34881966§ *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 ).
5
IS : 3347 (Part II/Sec 2) - 1979 M et a l P a r t o r A ccessor y
Connecti ng lug
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
F or 1 000 and 2 000 A Aluminium alloy brass conforming to conforming to A-6-M Grade 3 of I S : designation of I S : 617292-1961* or to I S : 1975‡ or any other 3488-1966† suitable aluminium alloy For 3 150 A copper to be agreed between the manufacturer and the chromium alloy purchaser
N OTE — 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. *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 ). **Dimensions for screw threads for bolts and nuts (diameter range M 42 to M 150).
6
IS : 3347 (Part II/Sec 2) - 1979 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 ).
7
IS : 3347 (Part II/Sec 2) - 1979
N OTE — 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
B USHING RATING CORRESPONDING d 1 l 1 l 2 kV/A RATING OF P ORCELAIN P ART OF SEC 1, kV/A (1) (2) (3) (4) (5) (6) Copper and 3.6/250 3.6/250 272 71 M 12 aluminium Copper 3.6/630 3.6/630 318 100 M 20 *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
T Y PE OF S TE M
(1)
53
(3)
d 1
d 13 c 8
l 1
l 2
l 3
(4)
(5)
(6)
(7)
(8)
110 110 140 140 148 148
24 24 29 29 34 34
M 30 × 2 Aluminium 3.6/630 3.6/1 000 29 300 Copper 3.6/1 000 3.6/1 000 29 300 M 30 × 2 M 42 × 3 Aluminium 3.6/1 000 3.6/2 000 41 340 M 42 × 3 Copper 3.6/2 000 3.6/2 000 41 340 M 48 × 3 Aluminium 3.6/2 000 3.6/3 150 47 353 Copper 3.6/3 150 3.6/3 150 47 353 M 48 × 3 N OTE — 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 ).
F I G. 2 S TEM
(7) 38.5
F OR 250 AND 630A R ATING
B USHING R ATING CORRESPONDING kV/A RATING OF P ORCELAIN P ART OF SEC 1, kV/A (2)
l 3
FOR 1 000,
2 000 AN D 3 150A R ATING 8
IS : 3347 (Part II/Sec 2) - 1979
T Y PE OF S TE M
(1) Aluminium Copper Copper
B USHING R ATING CORRESPONDING kV/A RATING OF P ORCELAIN P ART OF SEC 1, kV/A
d 14
d 15
d 16 M ax
h 7
l 3 M ax
(2)
(3)
(4)
(5)
(6)
(7)
(8)
3.6/250
3.6/250
M 12
45
24
15
19
3.6/630
3.6/630
M 20
63
39
18
27
F I G. 3 N UT
F I G. 4 N UT
FOR 250 AN D 630A RATING
FOR 630 AN D 1 000A
9
R ATING
IS : 3347 (Part II/Sec 2) - 1979
T Y PE OF S TE M
B USHING RATING kV/A
CORRESPONDING RATING OF P ORCELAIN P ART OF SEC 1,
d 17 H 8
d 18 d 19 M ax M ax
h 8
h 9
±0.3
d 4 M ax
l 6
kV/A (1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
Aluminium
3.6/1 000
3.6/2 000
41
62
56
34
27
50
100
Copper
3.6/2 000
3.6/2 000
41
62
56
34
27
50
100
Aluminium
3.6/2 000
3.6/3 150
47
78
66
39
32
60
110
Copper
3.6/3 150
3.6/3 150
47
78
66
39
32
60
110
F I G. 5 N UT
F OR 2 000 AND 3 150A
10
R ATING
IS : 3347 (Part II/Sec 2) - 1979
T YP E OF S TE M
(1)
B USHING RATING CORRESPONDING kV/A RATING OF P ORCELAIN P ART OF SEC 1, kV/A
l 4±0.3
S TE M
N UT
(5)
(6)
(2)
(3)
(4)
Copper and Aluminium
3.6/250
3.6/250
25
F ig. 1 See Fig. 3 See
Copper
3.6/630
3.6/630
37
F ig. 1 See Fig. 3 See
F I G. 6 S TE M SUBASSEMBLY
FOR 250 AN D 630A RATING
11
IS : 3347 (Part II/Sec 2) - 1979
T Y PE OF S TE M
B USHING RATING kV/A
CORRESPONDING RATING OF P ORCELAIN P ART OF SEC 1, kV/A
l 5
S TE M
N UT
(1)
(2)
(3)
(4)
(5)
(6)
Aluminium
3.6/630
3.6/1 000
307
See F ig. 2
See Fig. 4
Copper
3.6/1 000
3.6/1 000
307
See F ig. 2
See Fig. 4
Aluminium
3.6/1 000
3.6/2 000
347
F ig. 2 See
Fig. 5 See
Copper
3.6/2 000
3.6/2 000
347
See F ig. 2
See Fig. 5
Aluminium
3.6/2 000
3.6/3 150
360
See F ig. 2
See Fig. 5
Copper
3.6/3 150
3.6/3 150
360
F ig. 2 See
Fig. 5 See
F I G. 7 S TE M SUBASSEMBLY
F OR 630,
12
1 000, 2 000 AN D 3 150A R ATING
IS : 3347 (Part II/Sec 2) - 1979
B USHING RATING B USHING WITH ALUMINIUM S TE M kV/A d d d h t
B USHING WITH COPPER S TE M
d 2
d 20
d 21
h 10
t
2
20
21
10
(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 WASHER (T OP E ND )
B USHING RATING B USHING WITH ALUMINIUM S TE M kV/A d d d d h
B USHING WITH COPPER S TE M
d 25
24
25
11
d 22
(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
13
d 24
23
F I G. 9 WASHER (S TE M )
d 23
22
h 11
IS : 3347 (Part II/Sec 2) - 1979
B USHING RATING kV/A
B USHING WITH ALUMINIUM S TE M
d 28±0.3
d 29
B USHING WITH COPPER S TE M
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 SEALING WASHER FOR S TE M
T YP E B USHING RATING kV/A
B USHING WITH ALUMINIUM S TE M
d 30
(1)
(2)
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
d 31
S 2
B USHING WITH COPPER S TE M
d 30
d 31
S 2
(3)
(4)
(5)
(6)
(7)
(8)
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 GENERAL PURPOSE WASHER (F OUR T Y PES M , N , O AND P ) 14
IS : 3347 (Part II/Sec 2) - 1979
T YP E
RATING kV/A
B USHING WITH ALUMINIUM S TE M
B USHING WITH COPPER S TE M
d 26
d 27
T
d 26
d 27
T
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
R
3.6/250
45
70
3
28
50
3
R
3.6/630
56
90
3
40
70
3
R
3.6/1 000
70
104
3
45
70
3
R
3.6/2 000
90
125
3
70
104
3
R
3.6/3 150
—
—
—
90
125
3
X
3.6/250
40
70
3
25
50
3
X
3.6/630
45
70
3
45
70
3
X
3.6/1 000
63
90
3
56
90
3
X
3.6/2 000
80
110
3
70
104
3
X
3.6/3 150
—
—
—
90
125
3
F I G. 12 GASKET ( R AND X T Y PE )
15
As in the Original Standard, this Page is Intentionally Left Blank
IS : 3347 (Part II /Sec 2) – 1979
BUSHING RATING kV/A
WI TH ALUMINIUM S TE M
H 11 H 12 H 13
S
W
N
T
P
Q
R4
R 5
U
C
D 1
D 2
D 20
G
V
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
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
(10) (11) (12) (13) (14) (15) (16) (17) (18) (19)
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
F I G. 13 CONNECTING L UG
17
IS : 3347 (Part II /Sec 2) – 1979
1. I nsulator (top) 2. I nsulator (bottom) 3. Stem 4. Washer (top end) 5. Washer (stem) 6. Connecting lug 7. Sealing Washer (stem) T YP E
OF S TE M
Aluminium
Copper
B USHING RATING kV/A
8. 9. 10. 11. 12. 13. 14.
Sealing washer M Type General purpose washer Gasket X Gasket R Washer in accordance with I S : 2016-1967† N ut Spri ng washer (Type B as per I S : 3063-1972‡)
a M a x
b M a x
d 1
d 2
d 3
d 4
d 5
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 —
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 ).
F I G. 14 A SSEMBLY
18
OF BUSHING
Bureau of Indian Standards BI S is a statutory institution established under the B u r ea u o f I n d i a n S t a n d a r d s A ct , 1986 to promote 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 Amd. No. 2 Amd. No. 3
J une 1982 April 1987 March 1989
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