Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 3347-4-2 (1982): Dimensions for Porcelain TransformerBushings for Use in Lightly Polluted Atmospheres - Part IV: 24 kV Bushings, Section 2: Metal Parts [ETD 6: ElectricalInsulators and Accessories]

REAFFIRMEDIS : 3347 (Part IV/Sec 2) - 1982

REAFFIRMED

APR1DB4

( Reaffirmed 1999 )7UU9

Indian Standard

DIMENSIONS FORPORCELAIN TRANSFORMER BUSHINGS FORUSE IN NORMAL AND LIGHTLY POLLUTED

ATMOSPHERES

PART IV 24 kV BUSHINGS

Section 2 Metal Parts

( First Revision)

Third Reprint APRIL 2002(Incorporating Amendment No.1)

UDe 621'315'626: 621'315'612-2: 621'314·21: 006-78

© Copyright 1983

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI )]0002

Gr 8 July 1983

IS : 3347 ( Part IVjSec 2) • 1982

indian StandardDIMENSIONS FOR

PORCELAIN TRANSFORMER BUSHINGS FORUSE IN NORMAL AND LIGHTLY POLLUTED

ATMOSPHERES

PART IV 24 kV BUSHINGS

Section 2 Metal Parts

( First Revision )

Electrical Insulators and Accessories Sectional Committee, ETDC 3

ChaiT11UlnSmu P. M. AHLUWALIA

RepresentingCentral Electricity Authority, New Delhi

Members

DIREOTOR (. TRANSMISSION) } (Alternates toDEPUTYDIRECTOR ( SUBSTATION) .

Shri P. M. Ahluwalia)SHRI U. R. G. ACHARYA Directorate General of Posts and Telegraphs,

JabalpurDEPUTY GENERAL MANAGER (T) (Alternate)

SHRI R. S. ARORA Directorate General of Supplies and Disposals.New Delhi

Directorate General of Technical Development,New Delhi

Bengal Potteries Ltd, Calcutta

SHRI ANIL GUPTA ( Alternate)SHRI D. S. CHABHAL

SHRI CHANDER PARKASHSaar S. C. SEN ( Alternatei

SJ'mI R. T. CHARI Tag Corporation, MadrasSHRI A. GURUPATHAM (Alternate)

SHRI A. K. CHOPRA Punjab State Electricity Board, PadalaSHRI K. K. PURl (Alternate)

DIRECTOR (TRACTION & INSTALLA- Research, Designs and Standards Organisation.TIOl"). Ministry of Railways, Lucknow

JOINT DIREOTOR STANDARDS (TI) (Alternate)SHRI G. L. DUA Rural Electrification Corporation Ltd, New Delhi

SHRI S; B. DESHKAR (Alternate)SHRI K. R. KASHYAP High Tension Insulator Factory, Ranchi

SHRI A. K. AGARWAL (Alternate)

( Continued onpal' 2)

e Copyright 1983BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian eopyriglu Act (XIV or 1957) andrepr -duct lDin whole or in part by any means except with written permission or thepublis' dhall be deemed to be an infringement of copyright under the laid Act.

AMENDlVIENT NO 1 JULY 1987

TO

IS : 3347 (Part IV/Sec 2 )-1982 DIMENSIONS FORPORCELAIN TRANSFORMER BUSHINGS FOR USE INNORMAL AND LIGHTLY POLLUTED ATMOSPHERES

PART IV 24 kV BUSHINGS

Section 2 Metal PartaI

(First Revision)

(Page 29, Fig. 29) - Substitute the following for the existing-.,figure:

(ETDC 3)

1

AMENDMENT NO. 2 FEBRUARY 1989TO

IS: 3347 (Part 4/See 2) -1981 DIMENSIONS FORPORCELAIN TRANSFORMER BUSHINGS FOR USE

IN NORMAL AND LIGHTLY POLLUTEDATMOSPHERES

PART 4 24 kV BUSHINGS

Section 2 Metal Parts

( Fi"st Revision )

( First cover, pages 1 and 3, title) - Substitute the following for theexisting title:

'Indian Standard

DIMENSIONS FOR PORCELAIN TRANSFORMERBUSHINGS FOR USE IN LIGHTLY POLLUTED

ATMOSPHERES

PART 4 24 kV BUSHINGS

Section 2 Metal Parts

( First Revisionr( Page S, clause 1.1, third line) - Delete the words 'normal and'.

(ETDC3)

Reprograpby Unit, BIS, New Delbi,lDdia

.-\MEND1\iENT NO. 3 APRIL 1994TO

IS 3347 (Part 4/Sec 2) : 1982 DIMENSIONS FORPORCEL}J~ TRANSFORMER BVSHINGS FOR USE IN

UGHTLY POLLUTED ATMOSPHERESPART 4 24 kV BUSHINGS

Section 2 Metal Parts

( First Revision)

( Page L Fig. 1 ) - Substitute 'R 2.5 ::: 0.1' for 'R 3.5 :: 0.1 'fordimensions of :.:>cking pins.

(ETD06)Reprography Unit, 81S. New Delhi, India

......

.....M

461

Hexagonal nutHexagonal nutPlain washerSpring washerHexagonal nutPlain washer

Gc385 155 150

PARTS NOMENCLATURE8.9.

10.II.12.13.

1. Insulator2. Stem3. Cap4. Upper spark gap horn5. Sealing washer for stem6. Separator7. Sealing washer for general purpose

NOTE I _ Clamping arrangement of bushings shall be according to IS: 4257(Part 1 ).193 I 'Dimension for clamping arrangement for porcelain transformerbushing: Part 1 For 12 kV to 36 kV bushings (first revision).'

NOTE 2 _ Alternate arrangement for fixing oflower spark gap horn may be used.

All dimensions in mil lirnetres.

BUSHING R.l.TINGkV/A24/250

FIG. 29 BUSHI~G ASSEMBLY (FOR 24 kVj250 A RATING)

2

IS: 3347 ( Part IV/Sec 2) • i9u2

0.7 The dimensions of bushings for other voltages are covered by thefollowing parts of this standard :

Part I Up to and including I kV bushings

Section 1 Porcelain part>Section 2 Metal parts

Part II 3'6 kV'bushiIlgs

Section 1 Porcelain partsSection 2 Metal parts

Part III 12 and 17'5 kV bushingsSection I Porcelain partsSection 2 Metal parts

Part V 36 kV bushingsSection 1 Porcelain partsSection 2 Metal parts

Part VI 72'5 kV bushingsSection I Porcelain partsSection 2 :M:etal parts

Part VII 123 kV bushingsSection 1 Porcelain partsSection 2 Metal parts

0.8 The dimensions of porcelain transformer bushings for use in heavilypolluted atmosphere are covered by the series of IS : 8603 *, The metalparts covered by t l.is section may be used for bushings covered byIS : 8603*.

0.9 In the preparation of this standard considerable assistance has beenderived from the follow ing DIN standards issued by the DeutscherNonnenausschuss:

DIN 42531 (1968) Indoor and outdoor transformer bushings,insulation class 10 to :,0 kV, 250 i\

DIN 42532 (1969) Indoor and outdoor transformer bushings,insulation class 10 to 30 kV, 630 A

DIN 42533 (1969) Indoor and outdoor transformer bushings,insulation class 10 to 30 kV, 1000 to 3 150 A

O.lO For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated,expressing the result of a test, shall be rounded off in accordance

·Dimensions for porcelain transformer bushings for use in heavily pollutedatmospheres,

4

IS : 3347 ( Part IV/Sec 2) - 1982

with IS: 2-1960*. The number of significant places retained in therounded off value should be the same as that of the specified value inthis standard.

1. SCOPE

1.1 This standard ( Part IV/Sec 2 ) lays down the dimensions and materialsof metal parts and accessories of bushings of 24 kV used with transformersfor use in ~lOrmal and lightly polluted atmospheres.

2. MATERIAL

2.1 The material of various parts shall conform to the relevant IndianStandards specified below:

Metal Part orAccessory

Hexagonal nut( for stem)

For Bushing withCopper" Stem

Material brass, s c r e wthreads conforming to 2.2of IS : 1364-1967t andIS: 3138-1966::: with aminimum tensile strengthof 300 N/mm~

For Bushing withAluminium Stem

Material aluminium alloy,screw threads conform­ing to 2.2 of IS: 1364­1967t and IS: 3138­1966::: with the followingproperties:

a) Electrical conducti­vity .at 200C Min 43percent lACS (25Smjmm")

b) Tensile strength, Min300 N/mm2

c) Brinell hardness 5/250Min 100 HB

·Rules for roundingoff numerical values (revised).tSpecification for precision and semi-precision hexagon bolts, screws, nuts and lock

nuts ( diameter range 6 to 39 mm ) (first rlvisiDII).tSpecification for hexagonal bolts and nuts ( M 42 to M 150 ).

5

IS : 3347 ( Part IV/Sec 2 ) - 1982

Metal Part orAceeo'sory

Stem ( see Fig. 1,2 and 3 )

Cap (see Fig.4, 5 and 6 )

Upper andlower spark­gap horn ( seeFig. 7, 8, 9and 10 )

Spark-gap horncarrier ( seeFig. 11 )

Sealing washerfor stem (seeFig. 12,13 and14 )

For Bushing withCopper Stem

For 250 A rated bushingsbra ss to grade 3 of IS : 292­1961* or IS: 3488-1966tor IS: 319-1974t. For630, 1 000, 2000, 3 150A rated bushings highconductivity copper toETP grade of IS: 191­1967§ and properties toIS : 613-196411.

Brass to grade 3 of IS : 292­19C1*ortolS: 3488-1966t

Cold drawn bright steelbar to IS : 9550-1980**

Brass to grade 3 of IS: 292­19fi1* or to IS: 3488­1966t

Oil resistant nitrile rubbermade from vulcanizedbutadiene/a c ry 10 ni tr i 1erubber compound havinga hardness of 65 to 70IRHD

For Bushing withAluminium Stem

Aluminium alloy with thefollowing properties:

a) Electrical conducti­vity at 20°C Min 43percent lACS (25Sm/mm2

)

b) Tensile strength Min300 N/mm2

c) Brinell hardness 5/250Min 100 HB

Aluminium alloy to 4 600M designation ofIS: 617­1975~ or any other suit­able aluminium alloy

Cold drawn bright steelbar to IS : 9550-1980**

Aluminium alloy to 4600M designation of IS : 617­1975~ or any other suit­able aluminium alloy

Oil resistant nitrile rubbermade from vulcanizedbut ad: 2 ae/acry10nitrilerubber co npound havinga hardness of 65 to 70IRHD

• Specification for brass ingots and castings (revised).tSpecification for brass bars, rods and sections suitable for forging.lSpecification for free-cutting brass bars, rods and sections ( third revision ).§Specificalion for copper ( second revision).IISpecification for copper rods for electrical purposes (revis'd).~Specification for aluminium and aluminium alloy ingots and castings for general

engineering purposes ( second revision )."Specification for bright bars.

6

IS : 334:7 ( Part IV/Sec 2) - 1982

M.etal Part orAccessory

Separator (seeFig. 15, 16 and17 ) and seal­ing washer forgeneral pur­pose type M( see Fig. 22 )

Vent plug (seeFig. HI and 19 )

Sealing washerfor g e n era 1purpose ( seeFig. 20 and21) and seal­ing wash e rType N (seeFig. 22)

Connecting lug( see Fig. 23 )

For Bushing ,withCopper Stem

Oil resistant asbestos fibrejointing to Grade B/O ofIS: 2712-1979*'

For 630 A rated bushingslotted cheese head brassscrew AM 8 X 15 ofIS: 1366-1968t

For 1000, 2000, 3 150 Arated bushing slottedcheese head brass screwAM 6 X 15 of IS: 1366­1968t

Nitrile rubber or nitrilerubber bonded cork toType C Grade' RC-70 Cof IS: 4253 (Part II )­1980t

For 1 000 and 2000 Arated, bushings brass toGrade 3 ofIS : 292- 1961§or to IS : 3488-1966[1

For 3 150 A rated bushingcopper chromium alloyforging having the follow­ing characteristics:a) Electrical conductivity

at 200 G Min 81 percentlAGS ( 47 S m/mm~ )

ForBushing withAluminium Stem

Oil resistance asbestos fibrejointing of Grade B/G ofIS: 2712-1979*

For 630 A rated bushingslotted cheese head brassscrew AM 8, X 15 ofIS : 1366-1968t

For 1 000, 2000, 3 150 Arated bushing slottedcheese head brass ScrewAM 6 X 15 of IS: 1366­1968t

Nitrile rubber or nitrilerubber bonded cork toType C Grade RC-70-Cof IS : 4253 (Part II )­1980t

Aluminium alloy havingthe following properties:

a) Electrical conducti­vity at 20°C Min 42percent lACS 25Sm/mm2

b) Tensile strength, Min300 N/rhm2

c) Brinell hardness5/250, Min 100 HB

*Specification for compressed asbestos fibre jointing (secondrevision ).tSpecification for slotted cheese head screws <' dia range 1"6to 20 mm ) (first rloision ).tSpecification for cork composition sheets: Part II Cork and rubber (first revision).§Spe~ification for brass ingots and castings ( revised).I1Specification for brass bars, rods and sections suitable for forging.

7

IS : 3347 ( Part IV Sec 2 ) • 1982

Metal Part orAcassory

Collar (see Fig.24 )

Gasket ring (seeFig. 25)

Retaining ring(see Fig. 26 )

U -link ring ( seeFig. 27 )

T-Bracket (seeFig. 28 )

For Bushing withCopprr Stem

b) Tensile strength, Min370 N/mm2

c) Brinell hardness 5/250Min 125 HB

d) Chemical composition;chromium 0'3 to 12percent total impurities0'3 percent remainJercopper

Brass to Grade 3 ofIS : 292­1961* or to IS: 3488­1966t

PTFE or polyamide

Annealed copper wire

Phosphor bronze Grade 3HE to IS: 7814-1975§

Steel to Grade Fe 410-S(St 42-S) of IS: 22rj.1975!!

For Bushillg withAluminium Stem

Aluminium alloy to 4 COO.:vI designation of IS:617-1975~ or any othersuitable aluminiumalloy

PTFE or polyamide

Annealed aluminium wire

Phosphor bronze Grade3 HE errs . 7814·1975§

Steel to Grade Fe 410-S(St 42-S) of IS : 22(j­197511

NIITE - Whcr» synthetic rr ansformcr liquid is ust d the ma rrria ifor all sealingwashers .xcvpr t\'pe' 1\1 of Fig. 22 shall be silicone rubber or any other resilientmaterial compat ibl e with the synthetic liquid.

*Specifiration for hr.iss ingots and castings ( rerised ]:tSpecificati"n for brass b.i rs , rocls and secnons suitable for forging.!Specification for aluminium and aluminium allow ingots and castings for general

engineering purposes ( second rel'i,liOl1 ).

§Specification for phosphor bronze sheet, strip and foil.[Specification for structural steel ( standard quality) (fifth reuision],

8

18:

3347

(Part

IV/S

ec2

)•

1982

3.T

OL

ER

AN

CE

S

3.1

Unl

ess

spec

ifie

dot

herw

ise,

allo

wab

leto

lera

nce

oil

dim

ensi

ons

ofan

ym

achi

ned

met

alp

art

shal

lbe

inac

cord

ance

wit

hm

ediu

mcl

ass

of

IS:

2102

-196

9*.

3.2

Unl

ess

spec

ifie

dot

herw

ise,

allo

wab

leto

lera

nce

ondi

men

sion

so

fan

yfo

rged

orca

stm

etal

par

tsh

all

bein

acco

rdan

cew

ith

the

Coa

rse

clas

so

fIS

:21

02-1

969*

.

4.S

UR

FA

CE

FIN

ISH

4.1

'Ihe

surf

ace

fini

shfo

rfe

rrou

sp

arts

shal

lbe

hot

dip

galv

anis

ing

acco

rdin

gto

IS:

4759

-197

9tor

zinc

plat

ing

acco

rdin

gto

IS:

1573

­19

70:::

orca

dm

ium

plat

ing

wit

hch

rom

ate

pass

ivat

ion

Cd

8C

racc

ord

ing

toIS

:l5

72-1

968§

subj

ect

toag

reem

ent

betw

een

the

man

ufa

ctu

rer

and

the

purc

hase

r..

4.2

Th

esu

rfac

efi

nish

for

.non

,fer

rous

par

tssh

all

beel

ectr

otin

ning

acco

rdin

gto

IS:

1359

-1!1

7711

subj

ect

toag

reem

ent

betw

een

the

man

ufa

ctu

rer

and

the

purc

hase

r.

5.M

ET

AL

PA

RT

SA

ND

AC

CE

SS

OR

IES

5.1

Hex

ago

nal

Nu

ts-

Th

ehe

xago

nal

nuts

used

shal

lco

nfor

mto

IS:1364'-1967~

and

IS:

3138

-196

6**.

Th

eth

read

ssh

all

bein

acco

rdan

cew

ith

the

rele

vant

par

tso

fIS

:4

21

8tt

.

5.2

Th

edi

men

sion

so

fm

etal

par

ts,

and

acce

ssor

ies

for

bush

ings

wit

hco

pper

and

alum

iniu

mst

ems

corr

espo

ndin

gto

the

vari

ous

curr

ent

rati

ngs

shal

lb

ein

acco

rdan

cew

ithT

able

I.

*Spe

cifi

cati

onfo

ral

low

able

devi

atio

nsfo

rdi

men

sion

sw

ith

ou

tsp

ecif

ied

tole

ranc

es(f

irst

revi

sion

).tS

pec

ific

atio

nfo

rho

t-ni

pzi

ncco

atin

gon

stru

ctu

ral

stee

lan

do

ther

alli

edp

rod

uct

s(f

irst

revi

sion

).;S

peci

fica

tion

for

clec

rrop

late

dco

atin

gsof

zinc

onir

on

and

stee

l(f

irst

revi

sion

).§S

peci

fica

tion

for

elec

tro

pla

ted

coat

ings

ofc

adm

ium

onir

onan

dst

eel

(fir

stre

visi

on).

IiS

peci

fica

tion

for

elec

trop

late

dco

atin

gsof

tin

(sec

ondr

eois

ion)

.~Specification

for

prec

isio

nan

dse

mi-

prec

isio

nhe

xago

nbo

lts,

scre

ws,

nuts

and

lock

nuts

(d

iam

eter

rang

e,6

to39

mm

)(f

irst

revi

sion

).**

Spe

cifi

cati

on,f

orhe

xago

nal

bolt

san

dn

uts

(M

42to

M,1

50

).tt

Sp

ecif

icat

ion

for

ISO

met

ric

scre

wth

read

s.

9

IS : 3347 ( Part IV/Sec 2 ) - 1982

TABLE 1 DIMENSIONS OF METAL PARTS

( Clause 5.2 )

PAH'I';' ACCESSORY M~,'rAL OFSTEM

CUHHE:'fT RA'II1<G, A,- .A. -,

250 630 1000 2000 3 ISO

(I)

Stem

Cap

Upper spark-gaphorn

Lowe-r spark-gaphorn

Spark-gaphorn carrier

Sealing washerfor stem

Separator

Vent plug

Sealing washer forgeneral purpose

Connectinglug

Collar

Gasket ring

Retaining ring

V-Link ring

T-Bracket

(2)

AluminiumCopper

AluminiumCoppr r

AlumiuiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

AluminiumCopper

(3)

Fig. 1Fig. I

Fig. 4Fig. 4

Fig. 7Fig. 7

Fig. 12Fig. 12

Fig. ISFig. 15

Fig. 18

Fig. 20Fig. 20

(4)

J7ig . 3Fig. 2

Fig. 6Fig. 5

Fig. 9Fig. 8

Fig. 10

Fig. II

Fig. 14Fig. 13

Fig. 17Fig. 16

Fig. 19Fig. 18

Fig. 22Fig. 21

Fig. 23 A

Fig. 24

Fig. 25 BFig. 25 A

Fig. 26

Fig. 27

Fig. 28

(5)

Fig. 3Fig. 3

Fig. 6Fig. 6

Fig. 9Fig. 9

Fig. 10Fig. JO

Fig. 11Fig. 11

Fig. 14Fig. 14

Fig. 17Fig. 17

Fig. 19Fig. 19

Fig. 22Fig. 22

Fig. 23 BFig. 23 A

Fig. 24Fig. 24

Fig. 25 BFig. 25 B

Fig. 26Fig. 26

Fig. 27Fig. 27

Fig. 28Fig. 28

(6) (7)

Fig. 3Fig. 3 Fig. 3Fig. 6Fig. 6 Fig. 6

Fig. 9Fig. 9 Fig. 9

Fig. 10Fig. 10 Fig. 10

Fig. IIFig. II Fig. 11Fig. 14Fig. 14 Fig. 14

Fig. 17Fig. 17 Fig. 17

Fig. 19Fig. 19 Fig. 19

Fig. 22Fig. 22 Fig. 22Fig. 23 BFig. 23 B Fig. 23 B

Fig. 24Fig. 24 Fig. 24

Fig. 25 BFig. 25 B Fig. 25 B

Fig. 26Fig. 26 Fig. 26

Fig. 27Fig. 27 Fig. 27

Fig. 28Fig. 28 Fig. 28

6. ASSEMBLY

6.1 For 24 kV/250 A Rating - The assembly of the bushing is shownin Fig. 29.

6.2 For 24 kV/630 A Rating - The assembly- of the bushing is shownin Fig. 30.

6.3 For 24 kV/630, 1000,2000 and 3150 A Rating - The assemblyof the bushing is shown in Fig. 31.

10

IS: 3347 ( Pai't IViSec2 ) • f982

..';!

II

I oJ>oJ>

\"-:!?

"lIZ

NOTE: 1- Dimension L shall be adjustedso that the overall length 461 in Fig. 29is obtained.

NOTE 2 - The corresponding porcelain part for this stern shall be 24 kV{250 Aspecified in Part IV {Sec I of this standard.

NO·.rE 3 - Internal connections to the stem may also be made by means offlexible cable instead of using bolt. In such a case in place threaded hole of M 12,a suitable hole-required for the flexible cable may be made. -

NOTE 4"';' Thread ends and run outsshatl be according to IS : 1368-1980· andIS : 1369-1975t respectively.

All dimensions in mil'limetres,

FIG. 1 STEM ( FOR 24kV/250 A RATING)

·Dimensions of ends of bolts and screws (secondreuision).tDirnensions of'screw thread run outs and undercuts (]irst r'lIisiMl).

11

ts . 3347 ( Part IV/Sec 2) ·1982

<t> 22

aM

R2·5~o·,

i--J"120

!

aN

a

N '"N N

BOLT

N UTE I - L to be such that the overall length 493 in Fig. 30 is obtained.NUTE 2 - The corresponding porcelain part for this stem shall be 24 kV/630 A

specified in Part IV/Sec I of this standard.NUTE 3 -Internal connections to the stem may also be made by means of

flexible cable instead of using bolt. In such case instead threaded hole of M 20, asuitable hole required for the flexible cable may be made.

NOTE 4 - Thread ends and runout shall be according to IS: 1368-1980* andIS: 1369-1975t respectively.

All dimensions in millimetres.

FIG. 2 STEM(FOR24kVi630ARATING)

*Dimensions 'of ends of bolts and screws (second revision \.tDimEnsions of screw thread run-outs and undercuts (first revision).

IS : 3347 ( Part IV/Sec 2) - 1962

1--4-#----"

DESIGN LEFT TO

l i'J~"\.Z_-,-.;k;~~ L~~====:=dIo\-...1

TYPE OF BUSHING CORRESPONDING Dl D17 »; I. L.S'CEM RATING RATING OI!' POH-

kV/A CELAIN PAHT OF

SECTION 1kV/A

Aluminium 24-/630 24/1000 M30x 2 30 27 206 98

Copper 24/1000 24(1000 M30 X 2 30 27 206 98

Aluminium 24-/1 000 24-/2 000, 3 150 M42 X 3 42 39 236 128

Copper 24(2000 24-/2000, 3 150 M42 X 3 42 39 236 128

Aluminium 24-/2000 24-/2OeD, 3 150 M48 X 3 48 45 241 133

Copper 24-/3 150 24/2 OpO, 3 150 M4-8x3 48 45 241 133

NOTE- The threaded "ends shall be chamfered in accordance with IS : 1368-1980*. The thread runouts and undercuts shall be in accordance with IS: 1369-1975t·

All dimensions in millimetres.

FIG. 3 STEM ( FOR 24 kV/630, 1000,2000 AND 3 150 A RATING)

"'Dimensions of ends of bolts and screws (second revision).tDimensions ofscrew thread run-outs and undercuts (first "vision ).

13

All

dim

ensi

ons

inm

illi

met

res.

FIG

.4

CA

P(

FO

R24

kV/2

50A

RA

TIN

G)

All

dim

ensi

ons

inm

illi

met

res.

FIG

.5

CA

P(

FO

R24

kV/6

30A

-RA

TIN

G)

IS : 3347 ( Part IV/Sec 2 ) • 1982

TYl'E 011' BUSHING D. D'I DU Du DIsSTEM RATING

kV/A

Aluminium 24/630 100 32 54 80 80popper 24/1000

Aluminium 24/1000 120 44- 66 100 100Copper 24/2000

Aluminium %4/2000 120 50 72 100 100Copper 211-/3150

All dimensions in miltimetres.

FIG. 6 CAP ( FOR 24 kV/630, I 000, 2000 AND 3 150 A RATING)

15

IS : 3347 ( P'\l"t IV Sec 2) - 1932

-7"'-7+--- - --- - -_.

NOTE - The threaded ends shall be chamfered in accordance with IS : 1368­IgloO·. The thread ru nouts shall be in accordance with IS: 1369-1975t.

All dimensions in mill imetres.

FIG. 7 UPPER SPARK-GAP HORN ( FOR 24 kVj250 A RATING)

NOTE - The threaded ends shall be chamfered in accordance with IS : 1368­1980·. The thread runouts shall be in accordance with IS : 1369.1975t.

All dimensions in mil limetrea.

FIG. 8 UPPER SPARK-GAP HORN (FOR 24 kV/630 A RATING)

"Dimensions of end~of bolts and screws (second revision).tDimemions of screw thread run-outs and undercuts (first revision) .

16

IS : 3347 ( Part IV/Sec 2) - 1982

.-- J.lQ _

,--- ~~-t_~--- - --- --- -+-- oN

-:E

NOTE - The threaded ends shall be chamfered in accordance with IS : 1368­1980*. The.thread run-out shall be in accordance with IS : 1369-1975t.

All dimensions in milllmetres.

FIG. 9 UPPER SPARK.~GAPHORN ( FOR 24 kV/630~ 1000,2000 AND3150 A RATING)

o 0.., lD

All dimensions in miIIimetres.

FIG. 10 LOWER SPARK-GAl? HORN ( FOR 24 kV 630, 1000, 2000 AND3150 A RATING)

*DiiI!.ensions of ends of bolts and screws ( second revision ).tDimensions of screw thread run-outs and undercuts (first revision).

17

IS : 3347 ( Part IV/Sec 2) . 1932

<P 16 HOLE TO BEPROVIDED IN BL ANK-- - -- --------------\

80 32 54- 60 50

100 44 66 80 55 80 32 54 60 50

100 50 72 90 60 100 44 66 80 55

100 50 72 90 60

All dimensions in m illirnctres.

BUSHINGRATING

kV/A

24/630

24/1000

24/2 000

24/3150

FOR BUSHING WITH ALUMINIUM STf<;}I~- - __A----_--~

D'9 ])20 D21 D2 2 Q.

FOR BUSHING WITH COPPER STEM,... ---Jo,. ~

D'9 D 20 D21 D22 Q.

FIG. 11 SPARK-GAP HORN CARRIER ( FOR 24 kV/630, 1000,2000 AND

3 150 A RATING)

IS: 3347 fPart IV/Sec 2)· 1982

All dimensions in. millimetres.

FIG. 12 SEALING; WASHER FOR: SUM ( Foa2.4 k;'V1250; A RATING)

All dimensions in millimetres.

FIG. 13 SEALING WASHER FORSTEM' ( FOR 24 kV/630 A RATING)

546672

FOB BUSHING WITH'COPPER; STEM

BUSHINGRATING

kV/A

24'/63a24/1aOa24/200024'/3150

FOR BUSHING WITHALU,MINIUM STEM,....-__. __Jo~ .....

D.7 ± 0·5 Dsa ±0'3

304248

All dimensions in millimetres.

~

<>.....N

546672

304248

FIG. 14 SEALING WASHER FOR STEM(FOR 24 kV/630•. 1OOO~ 2000 AND 3150 A RATING)

1.9

18 13347 ( Part IV,Sec 2) • J982

i 1

All di rncnsions in rn ilIimetres.

FIG. 15 SEPAI{ATOR ( FUR 24 1V/25-0 A RATING)

All dimensions in millimetrel.

FIG. 16 SEPARATOR ( FOR 24 kV/630 A RATING)

20

IS : 3347 ( Part IV/Sec 2) • 1982

BUSHING RATING BUSHING WITH ALUMINIUM BUSHING WITH COPPER

STEM STEM,--___A-___.... ,... "-----~

kV/A DS9 Dso T U Dn Dau T U

24/630 56 32 12 48

24/1000 70 50 17 62 56 32 12 48

24/2000 70 50 17 62 70 50 17 62

24/3150 70 50 17 62

All dimensions inmillimetres.

FIG. 17 SEPARATOR ( FOR 24 kV/630, 1000, 2000AND 3 150A RATING)

AU dimensions in millimetre••

FIG. 18 VENT PLUO ( FOR 24 kV/630 A RATING)

All dimension. in millimetre••

FlO. 19 VENT PLUG ( FOR 24 kV/630, 1000,2000AND 3 150 A RATING )

21

18 : 3347 (Part IV/Sec 2) - 1982

!<P 76

All dimensions in mitlimetres.

FIG. 20 SEALING WASHERS FOR GENERAL PURPOS~

( FOR 24 kV/'250 A RATING)

<P90<P 125

4

[:t-=--·TAll dimensions in millimetres.

FIG. 21 SEALING WASHER FOR GENERAL PURPOSE

( FOR 24 kV/630 A RATING)

BUSBING RATING TYPE BUSBINGWJ~'BALUMINIUM BUSHING WITH COPPERSTEM STEM,.....--___.A.-____~ .--__.A____-..,

kV/A Dn D.. S Dn D.. S

24-/630 M 80 36 2N 160 110 4

24/1000 M ,100 ~ 2 80 36 2N 180 135 4 160 110 4

24-/2000 M 100 50 2 100 50 2N 180 135 4- 180 135 4-

24/3150 M 100 50 2N 180 135 4

All dimensions in millimetres.

FlO. 22 SEALING W AaHER FORG-ENERAL PURPOSE

(FOR 24 kV/630, 1000, 2000 AND 3 150 A RATING)

22

FORM A

Aluminium

Copper

co

'"

llUHHING RATINGkV/A

201/630

24/1000

IS : 3347 (Part IV/Sec 2·) • 1982

::;

FORM B

All dimensions in millimetres,

FIG. 23A CONNECTING LUG (FOR 24 kV/630, 1000 A RATING)

23

IS I 33"7 (Part IV/Sec2 ) • 1982

MID, 6•• 40

-$-$-'--- --

-(f)-¢n

IIii

~~~l" -SPRINGW.:,SHER BIDSee IS' 3063

FORM A FORM BTYPE OJ! BUSHING D1 B1 B. Bo B. E1 E. E3 E. E5 HI H, H3 H. T1 A~hE}r RA'!'ING

kV/A

Aluminium 24/10001JM 42 X 3 100 58 45 20 25 50 40 20 25 190 100 105 ISS 28 26°Copper 24/2000

Aluminium .24/2000}M48 X 3 120 68 58 28 30 60 45 18 30 210 120 125 175 26 30°Copper 24/3 150

All dimensions in millimetres,

FIG. 23B CONNECTING LUG ( FOR 24 IN!! 000, 2 000 AND 3 150 A RATING)

24I

IS : 3347 ( Part IV/Sec 2) ·1982

--I.x:i

BUSHING BUSHING WITH AL"ttMINIUM STEM BUSHING WITH COPPER STEMRATING ~-------~-------~

~_______ A _______•

kV/A D 33 D3• D 31 D 3s D 3 7 X D 33 »; D 31 Du D3 7 X

24-/630 56 34- 44- 33 30'7 10

24-{1000 70 4-6 60 50 4-2'7 15 56 34- 44- 33 30'7 10

24-{2000 70 52 60 50 4-8'7 15 70 4-5 60 50 4-2'7 15

24-/3150 70 52 60 50 4-8'7 15

All dimensions in mil'lirnetres.

FIG. 24 COLlAR (FOR 24 kVj630, 1000,2000 AND 3 150 A RATING)

25

IS: 3347 ( Part IV/Sec 2) ·1982

2 THICI<

q:, 14

25A 258

All dimensions in millimetres.

FIG. 25 GASKET RING (FOR 24 kV/630, 1 ODD, 2000 AND

3 150 A RATING)

BUSHING RA.TING

kV/ABUSHING WITH ALUMINIUM

STEMr-------A.-------.

DaB StretchedLength

BUSHING WITH COPPERSTEM

,---__.A.- ~

D 3 • StretchedLength

24/630

24/100024/2000

24/3150

27

3945

92'4

130152

2739

45

92'4·130

152

All dimensions in millimetres.

FIG. 26 RETAINING RING ( FOR 24 kV/630, 1000, 2000 AND

3150 A RATING)

26

IS : 3347 ( Part IVjSec 2) - 1982

o-'s1----~-_.c_-------1

I Ol,_D----....- !

II

(

I

f

BUSBINO RATINGkVjA

BUSHING WiTH AIiuMINIUMSTEM

,- .A.-_~__,

DaD D••

BUSHING WITH COFPERSTEM,- .A. -,

DaD D4D

24/630

24/10ll0

24/2000

24/3150

76 58

96 70 76 58

96 76 96 70

96 76

All dimensions in mil limetres,

FIG. 27 U·LJNK RING ( FOR 24 kV/630, 1000, 2000 AND3 150 A RATING)

27

IS : 1347 (Part IV jSec 2 ) • 1982

* ALTERNAI E METHOD OFFIXING OF LOWER SPARKGAP HORN

""o

1

.r,r-

493

Hexagonal nutHexagonal nutWasherSpring washerHexagonal nutWasher

10.II.12.13.14.IS.

GcA

417 ISS IBOPARTS NOMENCLATURE

6. Separator7. Vent plugB. Gasket ring9. Sealing washer

for generalpurposes

BUSHING RATING

kV{A24/630

1. Insulator2. Stem3. Cap4. Upper spark

gap horn5'. Sealing washer

for stemNOTE I - Clamping arrangement of bushing shall be according to IS: 4257

(Part I )-19Bl 'Dimensions for clamping arrangement for porcelain transformerbushings: Part 1 For 12 kV to 36 kV bushings (.first revision ).'

NOTE 2 - Alternate arrangement for fixing of lower spark gap horn may be used.

All dimensions in millimetres.

FIG, 30 BUSHING ASSEMBLY WITH COPPER STEM

(FOR 24 kV/630 A RATING)

(Pa.!:,e 30, Fig. 30) ·--Substitute the fullo\\.ng f01 -Ihe '.'.:>'l:';l;!ngfigure:

*ALTfRNATE METHOD OFFIXING OF lOWER $PAflXGAl" HORN

"'20,! !"e "

7

...o

oil..

FIG. 30 BUSHING ASSEMBLY WITH COPPER STEM

( FOR 24 kVj630 A RATIN'G)

t;

493

Hexagonal nutHexagonal nutWasherSpring washerHexagonal nut''''asher

10.11.12.13.14.15.

GcA

417 155 180PARTS NOMENCLATURE

6. Separator7. Vent plug8. Gasket ring9. Sealing washer

fOI" generalpurposes

Bt'IHn'C RA.T~~

k\'fA24j630

1. Insulator2. Stem3. Cap4. Upper spark

gap hom5. SeaEng washer

for stemN~ I - Clamping arrangement of bushing shall be according to IS: 4257

(Part 1 )·1981 'Dimensions for clamping arrangement for porcelain transformerbushings: Part I For 12 ItV to 36 ltV bushings (first revision)"

NO"l'B 2 - Alternate arrangement for fixing of lower spark gap horn may be used.

All dimensions in millimetre••

IL

ILl

Q)

<C(

.:

PARTS NOMENCLATURE

701

731

t;

626

G.

148

148

138

230

225

235

G1

178

F

183

148

314

314

314

E

16. Vent plug17. Gasket ring18. Grub screw19. Tvhrackct20. Hexagonal screw21. Hexagonal nut22. Spring washer23. V·link ring

183

183

163

D.

120

120

100

D.D3

135

110

135

M48x3

M42x3

M 30x2

155

155

155

9. Sealing washer forgeneral purposes Type M

10. Sealing washer forgeneral purposes Type N

11. Connecting lug12. Collar13. Retaining ring14. Hexagonal nut15. Hexagonal nut

C D1B

168

168

168

A

530

635

605

1. Insulator(0; 2. Stem~ 3. Cap

4. Spark-gap hom carrier5. Upper spark gap horn6. Lower spark gap horn7. Sealing washer for

stem8. Separator

Tn-x or BUSHINGSTEM RATING

kV/A

Aluminium 24/630Copper 24/1000Aluminium 24/1 000Copper 24/2000Aluminium 24/2 000Copper 24/3 150

NOTlC I - Clamping arrangement of bushings shall be according to IS : 4257 (Part 1 )-19BJ.NOTlC 2 - Alternate arrangement for fixing of lower spark gap horn may be used.

All dimensions in millimetres.

FIG. 31 BUSHING ASSEMBLY ( FOR 24 kV/630, 1000,2 000 AND 3 150 A RATING) -rIl~~

~

·Specificatioll (or clamping arrangements (or porcelain transformer bushings: Part I For 12 kV to 36 kV bushings(first rnisioll ).

Io'd~"I..1004

<:iiiItt'lN­•...Ill>CON

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