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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