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IS 1885-38 (1993): Electrotechnical Vocabulary, Part 38:
Power Transformers and Reactors [ETD 1: Basic
Electrotechnical Standards]
“!ा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”
Indian Standard
ELECTROTECHNICALVOCABULARY
PART 38 POWElfBTRANSFORMERS AND REACTORS
Second Revision )
(
UDC 621.314.222*6+621*318-43 : 001.4
Q BIS 1993
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
May 1993 Price Group7
cisaB lacinhcetortcelE Standards lanoitceS ,eettimmoC TE 01
STNETNOC
tceS ion Page
10-124 lareneG smret . . . . . . . . . . . . . . . 1
20-124 slanimreT . . . . . . . . . . . . . . . . . . 3
30-124 Windings ._. . . . . . . . . . .-. . . . 3
40-124 Rating . . . . . . . . . . . . . . . 4
.I.
50-124 sgnippaT .I. . . . . . . . . . . .*. 5
60-124 sessoL and daol-on tnerruc . . . .., . . . . . . . . . 6
70-124 ecnadepmI ,egatlov tiucric-trohs ecnadepmi and egatlov pord . . . . . _.. 6
80-124 erutarepmeT esir . . . . . . . . . . . . . . . . . . 7
90-124 noitalusnI . . . ._. . . . . . . ._. 7
01-124 snoitcennoC . . . . . . . . . . . . . . . . . . 8
11-124 daol-nO sregnahc-pat . . . . . . . . . . . . . . 9
21-124 daol-nO regnahc-pat evird-rotom smsinahcem ._. . . . . . . 10
xednl “. . . . . . . ._. . . . . . . 12
LANOITAN FOREWORD
sihT naidnI dradnatS ( traP 38 ) ( dnoceS noisiveR ) hcihw is lacitnedi htiw CEI buP 50 ( 421 ) ( 1990 )
lanoitanretnI‘ lacinhcetortcele yralubacov - retpahC 42 1 rewoP sremrofsnart and ,’srotcaer issued yb
eht lanoitanretnI lacinhcetortcelE noissimmoC ( CEI ,) was detpoda yb eht uaeruB fo naidnI Standards
no eht noitadnemmocer fo cisaB lacinhcetortcelE Standards lanoitceS eettimmoC and lavorppa fo eht
lacinhcetortcelE noisiviD .licnuoC
sihT naidnI dradnatS ( traP 38 ) was tsrif dehsilbup ni 1973 and eht tsrif noisiver was enod ni 1977 and
derevoc yralubacov gnitaler ot sremrofsnart .ylno sihT dnoces noisiver has neeb nekatrednu ot revoc
eht yralubacov gnitaler ot htob sremrofsnart and srotcaer and osla ot align ti htiw eht lanoitanretni
.ecitcarp
ylnO eht hsilgnE txet nevig ni eht CEI noitacilbup has neeb deniater elihw gnitpoda as naidnI
,dradnatS and as hcus eht egap srebmun nevig ereh era ton eht emas as ni CEI .noitacilbup
IS 1885 (Part 38) : 1993
11x Pub 50 (421) (1990)
Indian Standard
ELECTROTECHNICAL VOCABULARY
PART 38 POWER TRANSFORMERS AND REACTORS
Second Revision )
(
SECTION 421-01- GENERAL TERMS
421-01-01
power transformer
Notes.
A cilats eceip of sutarappa htiw two or erom sgnidniw
,hcihw yh citengalnortcele ,noitcudni sun)ifsnart 21 -sys I - (iencrally. core-type sremrofsnart incorporate concentric
lnet of gnitanretla egatlov dna tnerruc otni rehtona windings.
metsys of egatlov dna tnerruc- yllliusu of lncrclfid
seulav dna at the emas ycneuqerf for the esoprup of 2 - Since, there are types of transformer which do not come
gnittimsnart lacirtcele power. clearly within the categories of “core-type” and “shell-type”,
the use of these terms is deprccakd. Generally they can be
421-01-02 avoided by indicaling the type of windings. i.e. “concentric” or
“sandwich” and/or whether or not the magnetic circuit has
series reactor unwound Imagnetic return paths.
A reactot dednetni for seires noitcennoc ni a ,krowten 80-10-124
rehtie for gnidnil the tnerruc rednu tluaf snoitidnoc or
epyt-eroc reactor (deprecated)
for gnir&-daol ni lellarap .stiucric
A reactor ni hcihw the citengam tiucric sekal the mof
30-10-124
of mnuloc .)sgel(
shunt reactor
A reactor dednetni for tnuhs noitcennoc ni a krowten Note. - Since there are types of reactor which do not come
ot etasnepinoc rof eviticapac .tnerruc clearly within the categories of “core-type” and “shell-type “.
the use of these terms is deprecated. Generally they can be
421-01-04 avoided by indicating whctber or not the magnetic circuit has
unwound magnetic return paths.
arc-suppressiou coil
421-01-09
A elgnis phase lartuen gnihtrae reactor dednetni for
gnitasnepmoc the eviticapac htrae-ot-enil tnerruc eud epyt-llehs remrofsnart (deprecated)
ol a esahp-elgnis earth .tluaf
A remofsnart where the packets of snoitanimal -unof
50-10-124 gni the core dna sekoy dnuorrus the sgnidniw dna
esolcne yllareneg the rojam parts of .meht
three-pliuse earthing transformer
grouuding transformer )ASU( Notrs.
A esahp-eerht remrofsnart dednetni for noitcennoc ni 1 -
Generally, shell-type transformers incorporate sandwich
a krowten tuohtiw a ,lartuen ot edivorp na laicifitra
windings.
.lartuen
_’ - Since there are types of tran~formrr which do not come
60-10-124 clearly within the categories of “core-type” and “shell-type”.
eht esu fo
these terms is deprecated. Generally they can be
three-phase neutral reactor
avoided by indicating the type of windings. i.e. “concenlric” or
A esahp-eerht reactor dednetni for noitcennoc ni a “~ndwich” ,Ind/or whether or no1 thr magnetic circuit ha.c
krowten tuohtiw a lartuen ot edivorp na laiciftira -uen unwound magncttc return paths
.ldrt
421-01-10
.
70-10-124
epyt-llehs reactor (deprecated)
epyt-eroc remrofsnart (deprecated)
A rotcaer where the packets of snoitanimal gniinrof the
A remrofsnart ni hcihw the citnegaln tiucric takes the core dna sekoy dnuorrus the sgnidniw dna esolcne
mrof of smnuloc .)sgel( yllareneg the rojam part of .meht
1
IS 1885 (Part 38) : 1993
:NI buP 50 (421) (1990)
.etoN - ecniS ereht era sepyt fo rotcaer hcihw do ton emoc
ylraelc nihtiw eht seirogetac fo ”epyt-eroc“ dna ,”epyt-llehs“
1 nI- eht esac fo oil-immersed .sremrofsnart eseht yam ro yam
eht esu fo eseht krms is .detacerped yllareneG yeht nac eh
ton evah a noihsuc fo air ( ro rehto gas).
dediova yb indicating rehtehw ro ton eht citengam circuit sah
dnuownu citengam nruter .shtap
2 delaeS-- sremrofsnart llaf otni owt :seirogetac
421-01-11 )a sremrofsnart ni hcihw eht latot emulov fo ,lio rehtegot htiw
air (or rehto gas), ro yna noitanibmoc ,foereht sniamer tnatsnoc
auto-transformer
revo eht erutarepmet .egnar
A remrofsnart ni hcihw at tsael two sgnidniw evah a
b) sremrofsnart ni hcihw eht latot emulov fo ,lio rehtegot htiw
c0n1111011 part. air (or rehto gas). ro yna noitanibmoc ,foereht seirav revo eht
erutarepmet egnar dna siht noitairav is detadommocca yb a
421-01-12
delaes elbixelf reniatnoc ro a elbixelf .enarbmem
booster transformer
421-01-19
series transformer )ASU(
sealed reactor
A remrofsnart of hcihw eno gnidniw si dednetni ot eb
detcennoc ni seires htiw a tiucric ni order ot retla sti A reactor hcihw si ,gnihtaerb-non that ,si so delaes that
egatlov dna the other gnidniw si na gnizigrene .gnidniw there uac eb on tnacifingis egnahcretni neewteb sti
stnetnoc dna the lanretxe .erehpsomta
31-10-124
NOICS.
separate gnidniw transformer
1 -In eht esac fo oil-immersed ,srotcaer eseht yam ro yam ton
A remrofsnart gnivah sgnidniw htiw on nonunoc
evah a noihsuc fo air (or rehto gas).
parts.
2 delaeS- srotcaer llaf otni owt :seirogetac
.r/oN - A etarapes winding remrofsnart gnivah owt windings
)a srotcaer ni hcihw eht latot emulov fo ,lio rehtegot htiw air (or
yam be detangised a “double dnuow .”remrofsnart
rehto gas), ro yna noitanibmoc ,foereht sniamer tnatsnoc revo
eht erutarepmet .egnar
421-01-14
oil-immersed type transformer b) srotcaer ni hcihw eht latot emulov fo ,lio air ( ro rehto gas),
ro yna noitanibmoc ,foereht seirav revo eht erutarepmet egnar
A remrofsnart of hcihw the citengam tiucric dna -dniw dna siht noitairav is detadommocca yb a delaes elbixelf -noc
sgni are desremmi ni .lio reniat ro elbixelf .enarbmem
51-10-124 421-01-20
desremmi-lio epyt reactor encapsulated-winding dry-type transformer
A reactor of hcihw the citengam tiucric dna sgnidniw A epyt-yrd remofsnart gnivah eno or erom sgnidniw
arc immersed ni .lio dkaluspacue htiw dilos .noitalusni
421-01-16 421-01-21
dry-type trausformer encapsulated wiuding dry-type reactor
A remrofsnart of hcihw the citengam tiucric dna -dniw A epyt-yrd reactor gnivah sti gnidniw detaluspacne
sgui arc ton desrenuni ni na gnitalusni .diuqil
htiw dilos .noitalusni
71-10-124
22-10-124
dry-type reactor
non-encapsulated-winding dry-type transformer
rotcaerA of hcihw the citengam tiucric dna gnidniw are
A epyt-yrd remrofsnart gnivah enon of the sgnidniw
ton desremmi ni na gnitalusni .diuqil
detaluspacne htiw dilos .noitalusni
H-10-124
32-10-124
sealed trausformer
gnidniw-detaluspacne-non epyt-yrd reactor
A remrofsnart hcihw si ,gnihtaerb-non that ,si so delaes
that there nac eb on tnacifingis egnahcretni neewteb sti epyt-yrdA reactor gnivah sti gnidniw detaluspacne-non
stnetnoc dna the lanretxe .erehpsomta htiw dilos .noitalusni
2
IS 1885 (Part 38) : 1993
IEC Pub 50 (421) (1990)
SECTION 421-02 - TERMINALS
421-02-01 lartuen )tniop of a detcennoc-rats or detcennoc-gazgiz
.gnidniw
line-termiual
A lanimret dednetni for noitcetmoc ot a enil rotcudnoc )b roF esahp-elgnis sremrofsnart or :srotcaer
of a nelwork.
ehT lanimret dednetni for noitcetmoc ot a lartuen tniop
421-02-02 of a .krowten
ueutral termiuul 30-20-124
;I) roF esahpylop sremrofsnart or reactors dna -ylop gnidnopserroc slanimret
phase sknab esahp-elgni sfo sremrofsnart or :srotcaer
slanimreT of tnereffid sgnidniw of a ,remrofsnart
ehT )s(lanimret detcetmoc ot the nommoc tniop (the dekram htiw the emas rettel or gnidnopserroc .lobmys
SECTION 421-03 - WINDINGS
421-03-01 60-30-124
whdirig primary wiudiug
ehT yibmessa of 5nrut gnimrof na cirtcele tiucric -ossa A gnidniw ,hcihw ni ,ecivres seviecer evitca power
detaic htiw eno of the segatlov dengissa ot the -snart morf the ylppus .krowten
remrof or ot the reactor.
70-30-124
Note - For a esahpylop remrofsnart ro esahpylop ,rotcaer eht sfcoudary winding
“winding” is eht noitanibmoc fo eht esahp windings.
A gnidniw ,hcihw ni ,ecivres sreviled evitca power ot
421-03-02 the daol .tiucric
phase wiudiug
421-03-08
ehT ylbmessa of snrul gnimrof eno phase of a -ylop
auxiliary wiudiug
phase .gnidniw
A windhg dednetni ylno for a llams daol derapmoc
NO/L’ - eh‘l term esahp“ winding” dluohs ton be desu rof htiw the rated power of the .remrofsnart
gniyfitnedi eht ylbmessa fo coils no a specific leg.
90-30-124
stabilizing winding
30-30-124
A yratnemelppus detcennoc-atled ,gnidniw yllaicepse
dedivorp no rats-rats or gazgiz-rats detcennoc -snart
high-voltage winding
sremrof ot decrease the ecneuqes-orez ecnadepmi of
ehT gnidniw gnivah the tsehgih rated .egatlov
the detcennoc-rats .gnidniw
40-30-124
01-30-124
low-voltage wiuding
commou wiuding
ehT gnidniw gnivah the tsewol rated .egatlov
ehT nommoc part of the gnidniw of na -snart-otua
.remrof
50-30-124 11-30-124
intermediate-voltage winding seires winding
A gnidniw of a gnidniw-itlum remrofsnart gnivah a ehT part of the gnidniw of na remrofsnart-otua or the
rated egatlov etaidemretni neewteb the tsehgih dna gnidniw of a retsoob remrofsnart hcihw si dednetni ot
tsewol gnidniw rated .segatlov eb detcennoc in seires htiw a .tiucric
IS 1885 (Part 38) : 1993
IEC l’ub 50 (421) (1990)
421-03-12 sgndniw are degnarra .yllacirtnecnoc
energizing winding
421-03-14
ehT gnidniw of a retsoob remrofsnart hcihw si -ni
sandwich windings
dednet ot ylppus power ot the seires .gnidniw
nA tnemegnarra where the sgnidniw or parts of -dniw
421-03-13
sgni are degnarra .yllaixa
concentric windings
Al tnwncgnarrrt where the sgnidniw or sIrap 01 NC,re. - Normally the windings would ix sub-divided.
SECTION 421-04 - IWI’IN(;
421-04-01 yb the rated egatlov of the gnidniw dna yb na -irporppa
ate phase .rolcaaf
rated voltage of a winding
ehT egatlov dengissa ot eb ,deilppa or depoleved at 42 60-40-I
,daol-on neewteb the of a gnidniw of a
litle tertklals
csahpylop remrofsnart or reactor, or neewteb the -innet
slan of a gnidniw of a esahp-elgnis renrr)ksnart or a) of a seires :rotcaer
reactor.
ehT suounitnoc tnerruc for hcihw ehI reactor si -ed
20-40-124 .dengis
rated voltage ratio (of a )remrofsnart
)b ofa esahp-eerht lartuen reactor or esahp-eerht -htrae
ehT oitar of the rated egatlov of a gnidniw ot the rated gni :remrofsnart
egatlov of rehtona gnidniw detaicossa htiw a rewol or
lauqe rated .egatlov ehT suounitnoc tnerruc ni the lartuen for hcihw the
tnempiuqe si dengised nehw ti si deilppus at sti rated
30-40-124
egatlov dna .ycneuqerf
rated frequency
70-40-124
ehT ycneuqerf at hcihw the relnrofsnart or reactor si
dengised ot operate. rated short-time current
42 40-40-l a) of a seires reactor or elgnis phase larturn gnihtrae
:rotcaer
rated power
lanoitnevnocA eulav of tnerappa power, gnihsilbatse a ehT tluaf tnerruc hcihw the reactor si dengised ot yrrac
sisab for the ngised of a ,relmofsnart a tnuhs reactor or for a deificeps .noitarud
na noisserppus-cra ,lioc the s’rerutcafunam se-
dna the tests, gninimreted a eulav of the rated tiierruc
f@? a esahp-eerht lartuen reactor or gnihtrae -sttart
that yant eb deirrac htiw rated egatlov ,deilppa rednu
:reinrof
deificeps .snoitidnoc
Note. - Both windings of a two-winding transformer have the ehT tnerruc ni the lartuen hcihw the sutarappa si -ed
same rated power, which by definition is the rated power of the dengis ot yrrac for a deificeps .noitarud
transformer. For multi-winding transformers the rated power for
each of the windings may differ. 80-40-124
421-04-05 rated current fo na arc swppression coil
rated current
ehT tnerruc hcihw ehi sutarappa si dengised ot yrrac
(of a gnidniw of a remrofsnart or tnuhs reactor)
for deificeps doirep nehw rated egatlov si deilppa at
of :I
ehT ,tnerruc gniwolf hguorht a enil aninnet a -dniw rated ycneuqerf htiw the degnarrarotcaer for mumixam
,gni devired yb gnidivid the rated power gnidniwehtfo .tnerruc
IS 1885 ‘(Part 38) : 1993
IEC Pub 50 (421) (1990)
SIWTION 421-05 -TAPPINC;S
421-05-01 dedivid- yb the gnippat factor of the tapped gnidniw
tappiug fi siht si the wol egatlov .gnidniw
tap 90-50-124
A noitcennoc edam at emos etaidemretni tniop ni a tapping duty
.gnidniw
ehT lacirentun seulav dengissa ot the seititnauq -tlov(
ages, ,stnerruc err.) hcihw are desu for a nevig gnippat
421-05-02
noitcennoc as a sisab for the s’rerutcafunam seetnaraug
principal tappiug
,dna ni the niatrec cases, for the tests.
ehT gnippat ot hcihw the rated seititnauq are .detaler
421-05-10
30-50-124
tapping quantities
tapping factor
esohT seititnauq the laciretttutt seulav of hcihw enifed
ehT oitar (/d / NU gnippat( factor) or 100 du / NU the gnippat .ytud ehT gnippat seititnauq edulcni for
gttippal( factor expressed as a .)eghnecrep each gttidttiw attd for each :gnippat
:erehw a) a gttippat ,egatlov
NU si the rated egatlov of the gnidniw )b a gttippat power,
dU si the egatlov hcihw dluow eb depoleved at daol-on c) a gttippat .tnerruc
at the slanitttret ofthe gttidniw detcennoc no the gnippat
Note. -
,denrecnoc yb gniylppa rated egatlov ot att deppatttu Tapping quantities are related IO a given tapping con-
.gnidniw nection of the transformer and apply therefore to any winding.
including any untapped winding.
N0rr. - ch’l‘ gnippal
factor expresses the relative value ol‘ the 421-05-11
“cffeclive number of turns” of the tapped winding at the rele-
tapping voltage of a winding
vant tapping. lhe basis 1 being the effective number of turns of
this winding at the principal tapping. ehT egatlov dettgissa ot eb deilppa or depoleved at on
daol neewteb the enil slanintrel of a gnidttiw of a
421-05-04
esahpylop tratsforttter or neewteb the slanitttrct of a
plus tapping gnidttiw of a elgttis phase ,remrofsnart for the tnaveler
A gnippal whose gnippaI factor si rehgih nak 1. gttippat of the .remrofsnart
50-50-124 21-50-124
niiuus tappiug gnippat power of a windiug
A gttippal whose gttippat factor si rewol thatt 1. A lattoitttevttoc eulav of tnerappa power, gttihsi@tse
for the tnaveler gnippat noitcennoc of the rcntrofmut
60-50-124
a sisab for the s’rerutcafuttattt seetnaraug ,dna ni -rec
gnippat step ttiat cases, for the test.
ehT ecnereffid tteewteb the gnippat factors, expressed 31-50-124
as a ,egatnecrep of two tnecajda .sgttippat
tapping current of a wind&
70-50-124
ehT tnerruc gniwolf hguorht a enil lanimret of a -dniw
gnippat egnar gni devired yb gnidivid the gnippat power of the -dniw
gni yb the gnippat egatlov of the gnidttiw dna yb na
ehT noitairav egnar of the gttippat factor expressed as
etairporppa phase factor.
a percetttage derapmoc htiw the eulav .”001“
41-50-124
Notr. - If this factor ranges from 100 +n to 100 4, the tapping rewop-lluf gnippat
range is said to be +~o/o 4% or I a% if o = b.
A gnippat whose gnippat power si lauqe ot the rated
421-05-08 power.
tapping voltage ratio (of a pair of winding)
421-05-15
ehT oitar hcihw si lauqe ot the rated egatlov :oitar
reduced-power tapping
- deilpitlunt yb the gnippat factor of the tapped -dniw A gnippat whose gnippat power si rewol that1 rated
gni fi siht si the hgih egatlov .gnidniw power.
