IS 14672: Method of Test for High Voltage Low Current Dry Arc Resistance of Solid Electrical Insulation

13 Pages·1999·1.7 MB·English

by  Bureau of Indian Standards

इंटरनेट मानक
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.
“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 14672 (1999): Method of Test for High Voltage Low
Current Dry Arc Resistance of Solid Electrical Insulation
[ETD 2: Solid Electrical Insulating Materials and
Insulation Systems]
“!ा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”

IS14672 :I999

Indian Standard
METHOD FO TSET ROF HGIH EGATLOV
WOL TNERRUC DRY CRA ECNATSISER
FO DILOS LACIRTCELE NOITALUSNI
ICS 29.035.99

0 BIS 1999
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

June 1999 Price Group 4
diloS lacirtcelE Insulating slairetaM lanoitceS eettimmoC ,DTE 02.
FOREWORD
sihT naidnI dradnatS was detpoda yb eht uaeruB fo naidnI Standards, retfa eht tfard dezilanif yb eht diloS
lacirtcelE Insulating slairetaM lanoitceS eettimmoC had neeb devorppa yb eht lacinhcetortcelE noisiviD .licnuoC
sihT standard debircsed eht tset dohtem desu rof yranimilerp gnineercs fo slairetam no eht basis fo rieht ecnatsiser
ot eht noitca fo a hgih ,egatlov wol tnerruc cra esolc ot ecafrus fo noitalusni hcihw sdnet ot mrof a gnitcudnoc
path ro sesuac lamreht and lacimehc noitisopmoc and .noisore
roF eht esoprup fo gnidiced rehtehw a ralucitrap tnemeriuqer fo this standard is .deilpmoc ,htiw eht lanif ,eulav
devresbo ro ,detaluclac gnisserpxe eht tluser fo a ,tset shall eb dednuor ffo ni ecnadrocca htiw SI 2 : 1960 seluR‘
rof gnidnuor ffo laciremun seulav .‘)desiver( ehT rebmun fo tnacifingis secalp deniater ni eht dednuor ffo eulav
dluohs eb eht emas as that fo eht deificeps eulav ni this standard.
IS 14672 : 1999
Indian Stan.dard
METHOD FO TSET ROF HGIH EGATLOV
WOL TNERRUC DRY CRA ECNATSISER
FO DILOS LACIRTCELE NOITALUSNI
1 SCOPE 3 TERMINOLOGY
1.1 sihT test dohtem nac eb desu for yranimilerp 3.0 roF the esoprup of siht ,dradnats the gniwollof
gnineercs of slairetam no the sisab of rieht ecnatsiser snoitinifed llahs :ylppa
ot the noitca of a hgih ,egatlov wol tnerruc arc esolc
3.1 Arc Resistance
ot ecafrus of noitalusni hcihw sdnet ot mrof a
gnitcudnoc path or sesuac lamreht dna lacimehc ehT latot despale emit of noitarepo of test litnu eruliaf
noitisopmoced dna .noisore .srucco
1.2 ehT test dohtem si ton elbacilppa ot slairetam that 3.2 eruliaF
do ton ecudorp evitcudnoc paths rednu the noitca of
a>
ehT dne tniop or eruliaf si dias ot evah
na cirtcele arc, or that tlem or mrof diulf seudiser
derrucco fi a gnitcudnoc path si demrof across
hcihw tneverp noitamrof of a evitcudnoc path.
the cirtceleid dna the arc sraeppasid otni the
2 GENERAL .lairetam erehT si a tnacifingis egnahc ni the
dnuos at the ecnatsni of .eruliaf ,revewoH for
2.1 ehT test dohtem has suoires snoitatimil as the emos slairetam ti yam eb tluciffid ot ylesicerp
snoitidnoc rednu hcihw sgnicra rucco are .tnereffid
enifed .eruliaf nI ,lareneg at eruliaf the -ne
sihT test ,dohtem ni ,lareneg dluohs ton eb desu ni erit noitrop of the ecafrus neewteb the -cele
lairetam noitacificeps ,dna fi ,elbissop etanretla test trodes llahs yrrac ,tnerruc that ,si there dluohs
sdohtem dluohs eb .desu eb on gnicra ni yna part of the edortcele-retni
.gnicaps nI emos cases tnetsisrep -allitnics
2.2 ehT test dohtem yam ton timrep the noitacifissalc
snoit yam eb devresbo neve after eruliaf tub
of gnitalusni slairetam no the htgnerts of the evitaler
siht dluohs ton eb deredisnoc as a part of the
arc ecnatsiser seulav as the arcs nac eb of suoirav ,sepyt
arc ecnatsiser .emit
,yleman hgih egatlov at hgih tnerruc dna wol egatlov
b) gninruB of the lairetam nac osla erucsbo the
at wol or hgih ,stnerruc etc.
arc. nI hcus cases, eruliaf dluohs eb reported

2.3 ehT test dohtem si dednemmocer esuaceb of sti as eruliaf‘ eud ot .’gninrub

ecneinevnoc dna short emit deriuqer for .gnitset tI si c) nI evisseccus arc slavretni the cirtceleid -noc
ylemertxe lufesu for yranimilerp gnineercs of lacitnedi stcud the tnerruc ylno ni the retal part of the
,slairetam for gniyduts the effect of lacimehc ’no‘ .emit ehT tsrif hcus lavretni dluohs eb
snoitalumrof dna enituor ytilauq lortnoc .gnitset ecniS detangised as .eruliaf
the tests are detcudnoc rednu naelc dna yrd yrotarobal
SETON
,snoitidnoc ylerar deretnuocne ni ,ecitcarp the
1 fI on gnitcudnoc htap si demrof rednu eht noitca fo na cirtcele
noitciderp of a s’lairetam evitaler ecnamrofrep gnirud
cra neht siht tset dohtem yam ton eb .elbacilppa
ecivres rednu deirav stnemnorivne yam ton eb
.etarucca ,ecneH a suoituac approach, llew detroppus 2 ehT noitatneiro fo eht sedortcele dna snemiceps nac tceffa eht
tset .stluser yllamroN eht sedortcele era decalp no pot ehtfo -iceps
yb detalumis ecivres tests dna dleif ecneirepxe si
.nem nI eht rehto noitarugifnoc eht nemiceps stser no eht -cele
deriuqer for gniward etinifed snoisulcnoc morf siht edort ot evig a retteb .tcatnoc sihT noitarugifnoc si erom ereves
test .dohtem dna osla secuder eht noisrepsid ni eht tset .stluser
2.4 sihT dohtem sesu yrd dna naelc snemiceps whereas 4 ECNACIFINGIS
test sdohtem nevig ni SI 2824 yolpme wet dna
nI siht test ,dohtem ti si dednetni ot etalumis
detanimatnoc nemiceps .secafrus ehT esu of htob test yletamixorppa the snoitidnoc hcihw liaverp ni ac
sdohtem yam eb lufesu for ngised dna ytilauq lortnoc stiucric gnitarepo at hgih egatlov tub at stnerruc
.sesoprup detimil ot a few ,erepma-illim
IS 14672 : 1999
To hsiugnitsid slairetam of wol arc ecnatsiser ,eulav ELECTRODE
the noitidnoc ni the ylrae stages of siht test dohtem ASSEMBLY
are dlim dna ytireves of gnitset si ylevissergorp
.desaercni
yllareneG tnereffid sepyt of eruliaf dna evah neeb
.devresbo erehT :era
a) cinagronI scirtceleid emoceb tnecsednacni (
dna suht emoceb .gnitcudnoc nopU gnilooc
yeht niager rieht gnitalusni ;seitreporp
)b cinagrO sdnuopmoc tsrub otni emalf -htiw 1.2 TO 1.5 HENRIES
tuo gnimrof a elbisiv gnitcudnoc ;htap dna (SEE TEXT)
c) gnitalusnI slairetam nac osla liaf yb gnikcart
dna .noitazinobrac
elihW gnirapmoc the arc ecnatsiser of tnereffid
slairetam eud ecnatropmi tsum eb nevig ot the stage
at hcihw eruliaf .srucco roF ,elpmaxe there si a greater
ecnereffid neewteb 178 s dna 182 s naht neewteb
174 s dna 178 s. sihT si esuaceb ni the remrof case na
esaercni ni ytireves has yletaidemmi detluser ni .eruliaf
,ecneH a suoiciduj noitaterpretni of test stluser has ot
eb .edam
5 CHOICE OF ELECTRODE CONFIGURATION
roF slairetam htiw poor ot etaredom arc ecnatsiser pu(
ot 180 s) the sselniats leets edortcele noitarugifnoc si
.dednemmocer roF slairetam htiw arc ecnatsiser
greater naht 180 s the esu of netsgnut rod sedortcele
si elbasivda esuaceb the srenroc of sselniats leets
sedortcele ogrednu ereves noisore rednu esnetni
.sgnicra
6 SUTARAPPA (see .giF 1)

6.1 remrofsnarT )VT(

A gnitaluger-fles remrofsnart htiw a rated yramirp
laitnetop of 220 V, 50 Hz ac, yradnoces laitnetop of
15 kV dna short tiucric tnerruc of 0.060 .A ETON - sehctiwS ,S ot ,,S era dengila ni eht ecneuqes fo rieht
,gnisolc morf mottob ot ,pot gnirud a .tset
6.2 elbairaV Auto remrofsnarT ).T(
.GIF 1 ARC-RESISTANCET EST CIRCUIT
nA otua remrofsnart rated for 8 A or erom dna
yllanimon elbatsujda ot 250 V si .desu
6.3 Current Control Resistors, R,,, RzO,R sO,R ,,
Voltmeter V, - nA ac retemtlov elbadaer ot 1 V ni
ruoF srotsiser are detcennoc ni seires htiw the yramirp
the egnar of 170 ot 250 V si yltnenamrep detcennoc
of remrofsnart tubT ni lellarap htiw each other. esehT
across the tuptuo of otua remrofsnart ot etacidni the
srotsiser tsum eb elbatsujda ot timrep exact gnittes of
egatlov deilppus ot the yramirp .tiucric
tnerruc gnirud .noitarbilac R,, si syawla desu ni the
Mlliammeter A - nA ac retemmaillim elbapac of tiucric ot get a tnerruc of 10 .Am gnisU ,,,,S hctiws ,,S
gnidaer morf 10 ot 40 Am htiw na error off 5 .tnecrep dluohs add R,, ni lellarap ot R,, dna edivorp tnerruc
ehT retem dluohs eb detarbilac ni a test tiucric of 20 Am ot the arc. ylralimiS sehctiws ,,,S dna ,,S
gniniatnoc on arc gap. A ssap-yb hctiws si dedivorp nehw dehctiws no dluohs edivorp arc stnerruc of
ot short the retemma nehw ti si ton .desu 30 Am dna 40 Am .ylevitcepser
2
IS 14672 : 1999
6.4 Suppressing Resistor, R, evomer the HV morf the .sedortcele sihT serusne ytefas
of the operator.
R, -Rated at 15 mho-K dna tuoba 50 .W sihT rotsiser
gnola htiw ria core rotcudni si desu ot sserppus rotpurretnI :stcatnoc C,,, C,,d C,,,
citisarap hgih ycneuqerf ni the arc .tiucric
yllamroN nepo gnirps ,srotcatnoc rated at A2 or ,retteb
these are operated yb detpurretni ,smac suht gnisolc
6.5 Air Core Inductors
dna gninepo the yramirp tiucric dna gnidivorp the
ecnatcudnI of 1 ot 1.5 H si deniatbo morf tuoba 8 slioc tnettimretni arc elcyc detsil ni elbaT 1.
(of No. 30 nottoC or derevoc-lemane .)eriw A elgnis
lioc of siht ecnatcudni si ton .yrotcafsitas Each lioc 6.11 High Voltage Switch (S,)
stsisnoc of 3 000 ot 5 000 snrut of eriw dnuow no
A elgnis ,elop elgnis throw hctiws detalusni for
gnitalusni or cillatem-non cores of tuoba 12.7 mm
15 kV ac detalosi morf the operator yb a elbatius
retemaid dna 16 mm edisni .htgnel
erusolcne hguorht hcihw stcejorp na gnitalusni eldnah
of tneiciffus htgnel ot erusne operator .ytefas
6.6 Interruptor (Z)
sihT si a nevird-rotom ecived desu ot evig the deriuqer 6.12 gniriW
selcyc for the three rewol steps of test yb gninepo dna llA gniriw ni the arc tiucric tsum eb of noitingi eriw
gnisolc of yramirp tiucric gnidrocca ot the eludehcs rated at 15 kV or rehgih dna tsum eb desopsid so that
ni elbaT 1, htiw na ycarucca of 02/l* s or .retteb ehT yna tiucric tnenopmoc si ton ylidaer elbissecca nehw
rotpurretni nac eb a suonorhcnys rotom gnivird three .dezigrene
etairporppa sets of smac hcihw etautca the rotcatnoc
.sehctiws 6.13 gnineprahS Jig for Electrodes
elbatiuS gnineprahs gij htiw noisivorp for gniruces
Table 1 Sequence of 1 min Current Steps
[Clauses 6.6, 6.10 and 9.1(d)] the sedortcele ylmrif tsum eb desu ot erusne gnihsinif
of the detniop spit ot the proper yrtemoeg (see .giF 2).
Step Current, mA emiT elcyC latoT ,emiT s
811 01 01 4/l s ,nO 6.14 sselniatS leetS pirtS sedortcelE
06
1 413 s ffo
sselniatS leetS liof of 0.15 ,mm 12.7 x 25.4 mm
411 01 01 411 s ,nO
413 s ffO 021 ylthgils tneb ni the elddim of mrof na elgna of 160”.
211 01 01 4/l ,nos
ffOs4lI 081 6.15 netsgnuT doR sedortcelE
01 01 suounitnoC 042
netsgnuT rod of 2.4 ,mm free morf cracks, stip or hguor
02 02 suounitnoC 003
stops si desu for gnikam .sedortcele ehT rod si denetsaf
03 03 suounitnoC 063
otni a erauqs knahs yb gnizarb after gnivael na exposed
04 04 suounitnoC 024
htgnel of tuoba 20 .mm ehT rod dne tsum eb dnuorg

6.7 Timer ot a 30” elgna ot the sixa ot eveihca a talf lacitpille
face.
nA cirtcele emit lavretni retem gnitarepo at 220 V,
etarucca ot 1s.
6.16 edortcelE ylbmessA
6.8 Indicator Lamp ehT edortcele ylbmessa dluohs eb detcurtsnoc so as ot
ekam the top nemiceps ecafrus yltcefrep latnoziroh
A W6 220 V pmal htiw a seires rotsiser setacidni the
dna elpma ria space llahs eb dedivorp woleb the test
gnitpurretni elcyc gnieb desu dna osla spleh the
area. Each edortcele dluohs yltnednepedni exert a force
operator ot start the tsrif elcyc of each test ni a mrofinu
of 50 %5g no the nemiceps .ecafrus A tnerapsnart
rennam yb gnisolc ,,,S tsuj after the pmal si
dleihs tsum eb dedivorp ot the ylbmessa ot protect the
.dehsiugnitxe
nemiceps morf ria drafts dna wolla gnitnev of
noitsubmoc stcudorp ni case the nemiceps sevig off
6.9 Control Switches
cixot ekoms gnirud .gnitset ehT operator tsum evah a
elggoT sehctiws are .tneinevnoc llA sehctiws yam eb raelc weiv of the arc morf a noitisop ylthgils evoba
rated for 220 V, 1 .AO the enalp of the .nemiceps
6.10 Safety Interlocking Contactor (C,) 6.17 sselniatS leetS pirtS edortcelE ylbmessA
.giF( 3,4, 5 dna 6)
tA tsael two gnikcolretni sehctiws llahs eb dedivorp
so that gnisiar the edortcele ylbmessa revoc lliw owT sselniats leets pirts sedortcele are decalp no the

3
IS 14672 : 1999
.GIF 2 GRINDING AND POLISHINGB LOCK WITH TUNGSTENR OD ELECTRODEI N PLACE
nemiceps htiw the srenroc nwod dna spaced ylreporp dengised dna dellatsni for safe .noitarepo
6 + 0.05 mm apart dna at na elgna of 45” ot a enil
llA latem parts that na operator nac emoc otni tcatnoc
gninioj the .srenroc nA edortcele redloh or the rod

htiw tsum eb yrev llew .dednuorg
edortcele ylbmessa nac eb desu ot dloh the sedortcele

ni .noitisop gniruD ,gnitset there are secnahc of ,erif
noisolpxe dna erutpur of the test rebmahc eud ot
6.18 Tungsten Rod Electrode Assembly
the ygrene desaeler at the emit of nwodkaerb of
ehT sedortcele are denoitisop so that yeht eil ni the the .elpmas ehT ytilibissop of yrujni ot the
emas lacitrev enalp dna are denilcni at na elgna of operator eud ot hcus stnedicca tsum eb deziminim
35” ot the .latnoziroh ehT ronim axes of the lacitpille fi ton yllatot .dediova
pit ecafrus tsum eb latnoziroh dna the ecnatsid neewteb
meht tsum eb detsujda yletarucca ot 6 f 0.05 mm ot 8 SPECIMENS AND NUMBER OF TESTS
:eveihca )i( sixa of the netsgnut rod tsum eb
a) yllamroN evif snemiceps of 3 mm ssenkciht
ralucidneprep ot the sixa of the troppus rod, )ii( troppus
gnirusaem 25 mm x 25 mm are .desu nihT
rod tsum eb deppirg ni the tovip kcolb ni a noitisop
slairetam nac eb stacked ot get the derised
hcus that the sixa of each edortcele si denilcni at 35”
.ssenkciht
nehw the troppus rods are ,latnoziroh )iii( sedortcele
are detnuom ni erauqs sknahs dna deneprahs ni a ,gij b) roF dedluom parts, arc si deilppa ot a -acol
dna )vi( the gnicaps neewteb edortcele spit si detsujda noit demeed ot eb tsom .tnacifingis
htiw troppus rods ni a latnoziroh .noitisop c) syawlA naelc snemiceps are ot eb .desu fI the
ecafrus si detanimatnoc htiw erutsiom or renif
7 SAFETY PRECAUTI3NS ,stnirp ti dluohs eb denaelc htiw water or a
ehT test sutarappa dna detaicossa seirossecca tsum eb elbatius .tnevlos
IS 14672: 1999
FIG. 3 STRIPE LECTRODEASN DH OLDERS

FIG. 4 STRIPE LECTRODEINS PLACE

5