IS 9348: Coupling capacitor and capacitor dividers

47 Pages·1998·2.9 MB·English

by  Bureau of Indian Standards

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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.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 9348 (1998): Coupling capacitor and capacitor dividers
[ETD 29: Power Capacitors]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 8439 : 1998
IEC 358 (1990)
w?TRvmx

Gbi-kik3tk 4+iKiki
* ~wtY
(=wjjm)
Indian Standard
GNILPUOC SROTICAPAC DNA ROTICAPAC
SREDIVID
(
First Revision )
ICS 31.060.70.29.120.30

0 SIB 8991
BUREAU OF INDIAN STANDARDS
KANAM ,NAVAHB 9 RUDAHAB HAHS RAFAZ GRAM
NEW IHLED 200011

July 1990 Price Group 12
rewoP sroticapaC lanoitceS Committee, TE 92
LANOITAN FOREWORD
sihT naidnI dradnatS hcihw si lacitnedi htiw CEI 853 )0991( gnilpuoC‘ sroticapac dna roticapac ’sredivid
deussi yb eht lanoitanretnI lacinhcetortcelE noissimmoC saw detpoda yb eht uaeruB fo naidnI
sdradnatS no eht snoitadnemmocer fo eht rewoP sroticapaC lanoitceS Committee TE( )92 dna
lavorppa fo eht lacinhcetortcelE noisiviD .licnuoC
ehT txet fo eht CEI dradnatS sah neeb devorppa sa elbatius rof noitacilbup sa naidnI dradnatS tuohtiw
.snoitaived sihT dradnats sedesrepus eht stnetnoc fo SI 9791:8439 dna setutitsnoc sti lacinhcet
.noisiver
nI eht detpoda ,dradnats niatrec ygolonimret dna snoitnevnoc era ton lacitnedi ot esoht desu nI naidnI
.sdradnatS noitnettA si yllaiceps nward ot eht :gniwollof
a) Wherever eht sdrow lanoitanretnI‘ ’dradnatS raeppa gnirrefer ot siht ,dradnats yeht dluohs eb
daer sa naidnI‘ .’dradnatS
b) Comma (,) sah neeb desu sa a lamiced marker elihw ni naidnI ,dradnatS eht tnerruc ecitcarp
si ot esu a tniop (.) sa eht lamiced marker.
nI siht detpoda ,dradnatS ecnerefer sraeppa ot niatrec lanoitanretnI sdradnatS rof hcihw naidnI
sdradnatS osla .tsixe ehT gnidnopserroc naidnI sdradnatS hcihw era ot eb detutitsbus ni rieht ecalp
era detsil woleb gnola htiw rieht eerged fo :ecnelaviuqe
International Standard Corresponding Indian Degree of
Standard Equivalence
CEI 05 )634( : 0991 lanoitanretnI SI 5881 )24traP( : 3991 lacitnedI
lacinhcetortcele yralubacov retpahC 634 :
rewoP sroticapac
CEI l-06 : 9891 hgiH egatlov tset SI 702 (Part 1) : 3991 od
traP-seuqinhcet 1 : lareneG snoitinifed dna
tset stnemeriuqer
CEI 2-06 : 3791 hgiH egatlov tset SI 1702 (Part 2) : 4791 tnelaviuqE
traP-seuqinhcet 2 : tseT serudecorp

CEI 3-06 : ,6791 hgiH egatlov tset SI 1702 (Part 3) : 6791 od

traP-seuqinhcet 3 : gnirusaeM secived
CEI 4-06 : ,7791 hgiH egatlov tset SI 0968 : 7791 od
traP-seuqinhcet 4 : noitacilppA ediug rof
gnirusaem secived
CEI l-17 : 6791 noitalusnI traP-noitanidrooc SI 5612 (Part 1) : 7791 od
:1 Terms, ,snoitinifed selpicnirp dna selur
CEI 2-17 : 6791 noitalusnI traP-noianidro-oc SI 6173 : 8791 od
2 : elbacilppA ediug
CEI 011 : 3791 snoitadnemmoceR rof SI 1529 : 9791 od
sroticapac rof evitcudni taeh gnitareneg stnalp
gnitarepo ta seicneuqerf neewteb 04 dna
42 000 zH
CEI 341 : 2791 seireS sroticapac rof rewop SI 5389 : 1891 od
systems
CEI 681 : 7891 egatloV transformers SI 6513 : 2991 od
CEI 332 : 4791 stseT no wolloh srotalusni rof SI 1265 : 0891 od
esu ni lacirtcele tnempiuqe
CEI 252 : 5791 CA rotoM sroticapac SI 3992 : 8991 lacitnedI

( Continued on third cover)
SI 8991:8439
IEC 358(19W)
CONTENTS
Clause
SECTION ONE - GENERAL
Scope ............................................... ........... 3
:: Object ......................................................... 4
3qD:ef initions .................................................... 4‘
Service conditions ............................................. ’9
SECTION TWO - QUALITY REQUIREMENTS AND TESTS
Z: Test requirements ............................................. 10
CI8ssification of tests .......................................... 10
ii: Capacitance measurement at pow8r frequency .................. 12
Capacitor loss measurement .................................... 13
1::V oltage tests .................................................. 14
Voltage test between low voltage terminal and earth terminal ... 17
11. Discharge test ................................................. 18
12. High frequency meesurements (only for coupling capacitors and
capacitor dividers intended for carrier coupling) ............... 18

Partial discharge test .......................................... 20
::- Determination of the temperature coefficient .................... 23
15: Sealing test .................................................... 24
16. Cantilever test ................................................ 24
SECTION THREE - INSULATION LEVELS AND CRELPAGE DISTANCE
17. Insulation levels and test v&ages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
18. Creepage distance . . . . . . . . . . . . . . . ..*................*.......... 27
SECTION FOUR - SAFETY REQUIREMENTS
19. Connections to metal parts . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . 27
20. Protection of the environment . . , . . . . . , , . . . . . . . . . , . . . . . . ..*.*... 28
21. National regulations ..*.......*.....,* * ...,,,......b .......,*.. 28

1
IS :8439 1998
IEC 358(l990)
Page
Clruse
SECTION FIVE- MARKINGS
.................................. 28
22. Marking of the capacitor unit
23. Marking of the capacitor stack ................................. 28
SECTION SIX - GUIDE FOR INSTALLATION AND OPERATION
92
24. General .......................................................
........................................ 30
Choice of rated voltage
...................................... 30
Z: Choice of insulation level
30
27. Operating temperature .........................................
28. Special ‘conditions ............................................. 32
29. Mechanical stress .... ..W ....................................... 33
APPENDIX A- Capacitor diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
APPENDIX B - High frequency characteristics of coupling capa-
citors for power line carrier circuits . . . . . . . . . . . . . . . . . 36

2
IS 9348:1998
IEC 358(1990)
Indian Standard
COUPLING CAPACITORS AND CAPACITOR -
DIVIDERS
( First Revision )
SECTION ONE - GENERAL
, apocS
This standard is applicable to:
cou,pling capacitors for power line carrier (PLC) systems on
high voltage overhead power lines, the power-frequency range
being 15 Hz to 60 Hz, and the carrier frequency range 30 kHz
to 500 kHz;
lb capacitor dividers of capacitor voltage transformers. Additional
requirements for capacitor voltage transformers are given in
IEC Publication 186;
lC
capacitors with one terminal either permanently earthed or at low
voltage as used for overvoltage protection and other similar uses.
Notes f.- Diswsms of capacitors to which this stan&rd spplies ars
givsn in Figures Al to A4 in Appendix A.
-.2 Ths following cspscitors arm sxcludsd from this standard:
shunt cspscitors for S.C. power systsss having a rstsd
voltage sbovs 660 V (IEC Publication 8711;

shunt power capacitors of the self-healing typo for

systsss having s rstsd voltsgs pu to snd including
S.C.
660 V (IEC Publicition 831)~
shunt power cmpscitors of ths non self-healing type for
s.c. systems having s rstsd voltsgs to and including
UP
660 V <IEC Publication 93111
cspscitors for inductive heat generating plrnts opsr-
sting at frequencies between 40 and 24 000 Hz (IEC
Publication 1101;
series capacitors CIEC Publication 1431;
espstitors for motor spplicstions and the like
CIEC Publication 2521;
capacitors to be ussd in power electronics circuits
(IEC Publication under consideration);
3
-- __.. ....__.. I __- ”_. -_.. 11.“.1__4. __-.~.-~.l
I
IS 9348:1998
IEC 358(1990)
capacitors for use ni tubular fluorescent and other
discharge lemp circuits (IEC Publication 566);
capacitors for suppression of radio interference (IEC
Publication 384-14);
capacitors intended to be used in various types of
elactrical equipment and therefore considered as
componentsi
capacitors intended for use with d.c. voltage super-
imposed on the a.c. voltas#e.
2.
Ths object of th& standard is:
a) to formulate uniform rules regarding performance, testing and
f
rating;
6) to formulate specific safety rules;
c) to provide a guide for installation and operation.
3. Definitions
3.1 Cupucltor element (or element)
A device consisting estentioliy of two electrodes separated by a
dielectric (I EV 436-01 -(x3*).
3.2 Capacitor unit (or unit)

An assembly of one or more capacitor elements in the same container

with terminals brought out (IEV 436-01-04).
Notes .1 - A common type of unit for coupling capacitors has a
cylindrical housing of insulatina material and metal end
segnalf hcihw evres as terminals.
2.- Units in metal containers usuelly have one terminal con-
nected to the container and the other brought out through a
bushing.
3.3 Capacitor stock (or stack)
An assembly of capacitor units connected in series (IEV 436-01-05).
The capacitor units are usually mounted in a vertical array.
Note. -
* IEC Publication 50(436) (in preparation).
4
IS 9348:1998
IEC 358(1990)
3.4 Capacitor
A general term used when it is not necessary to state whether
reference is made to a capacitor unit or to a capacitor stack.
3.5 Rated capacitance of a captxltor (C,)
The capacitance value for which the capacitor has been designed.
This definition applies%
Nate.-
for a c8pacitor unit, to the capacitance between the
terminals of the uniti
for a capacitor stack, to the capacitance between line and
low voltage terminals or between line earth terminal,
and
of the stack;
for a capacitor divider, to the resultant capacitance:
3.6 Rated frequency of u capacitor (f,)
The frequency for which the capacitor has been designed (IEV
436-01-14).
3.7 Rated voltage of a capacitor (U,,,)
The r.m.s. value of the alternating voltage for which the capacitor
has been designed (IEV 436-01-15).

3.8 Rated temperature cate g ory of a capacitor
The range of temperature of the ambient air or of the cooling medium
for which the capacitor has been designed (IEV 436-01-17).
3.9 Ccam/tor voltage divider
A capacitor stack forming an alternating voltage divider (IEV
436-02- 10).
Notes -.I See Figures A3 and A4, Appendix A.
-.2 A capecitor divider usually forma pmrt of l capacitor
voltrpr trensformer.
3.10 Coupling cqwcltor
A capacitor used for the transmission of signals in a power system
(IEV 436-02-11).

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