中英文翻译器

18Tests

18.1Thespecificationsandorderfortestsarenotedinthesubquentpartsofthisstandard.

18.2Unlessotherwispecified,alltestsshallbeconductedatthesupplyvoltagesspecifiedinTable12.480V的电压进行

18.3Whenmarked,theprimaryinputinamperes,voltamperes,orwattsshallnotexceedthemarkedratingbymorethan

10percentwhenthetransformerisoperatedfromasupplycircuitoftheratedvoltageorvoltagesandfrequencyasmarked

anddeliveringratedoutputvoltageandcurrent,maryinputamperesshall

notexceedthemarkedratingwhentheequipmentisoperatedatatestvoltagespecifiedinTable12.（对电压电流损耗

的规定）

18.4Tetransformerisratedforarange

offrequencies(suchas50–60Hz)orhasadualfrequency(suchas50/60Hz),testsshallbeconductedat60Hzunless

otherwispecifiedinthisstandard.（频率说明）

18.5ResultsobtainedfromthetestsdescribedinClaus25and26performedontransformerswithaluminumwindings

r,resultsofthotestsconductedontransformers

withcopperwindingscannotbeudtoreprenttransformerswithaluminumwindings.（铜和铝绕组的规定）

18.6WithregardstoClau18.2,whenatransformerisprovidedwithoneormoreprimaryvoltagewindingtaps,the

e

voltageixpresdasarange,thehighestvoltageoftherangeshallbeud.（分接电压的规定）

19InsulatingBarriersTest（层绝缘）

ulatingmaterialshallbeplacedbetween

ctrodesshallbecylindricalbrassorstainlesssteelrods6.4mm(0.25in)indiameterwith

edgesroundedtoa0.8mm(0.031in)ermoveableelectrodeshallweigh502gramstoexertsufficient

tpotentialshallbeincreadtothetestvalueandthe

hallnotbedielectricbreakdown.（对绝缘材料的绝缘试

验要求，）

20Pullout,Bending,andTwistingTests（拔、弯曲、扭曲试验）

20.1Conduitandfixtureconnectionsofatransformerconstructedforsupportbyrigidmetalconduitshallbesubjectedto:

a)Apullof890N(200lb);

b)Abendingmomentof67.8N•m(600lbf-in);and

c)Atorqueof67.8N•m.

nectionsshallnotbepulledapartfollowingthistest.（试验力度的要求）

20.2Whenthepullouttestisconducted,thetransformershallbesupportedbyrigidmetalconduitintheintendedmanner.

Then,thetransformershallsupportaweightof90kg(198lbs)or,ifafixturestudorsimilarfittingisprovided,theweight

shallbesupportedfromrigidmetalconduitorsimilarmaterialthreadedontothisfittingsothatthestudandtheconduit

connectionaretestedsimultaneously.

20.3Whenthebendingandtwistingtestsareconducted,thetransformershallberigidlysupportedbyameansotherthan

endingtest,erarm

shallbemeasuredfromtheinnerendofthethreadedction,inaconduit-hub-orstud-typeconnection,tothepointof

applicationofthebendingforce.

20.4Inthetorsiontest,thetorqueshallbeappliedtotheconduitinadirectiontendingtotightentheconnection,andthe

leverarmshallbemeasuredfromthecenteroftheconduit.

21BondingConductorTest（导体焊接试验）

21.1AbondingconductorshallbesubjectedtothetestsnotedinClaus21.2–21.4whereappropriate.

Neitherthebondingconductornortheconnectionshallopenwhen:

a)Carryingcurrentqualto135and200percentoftheratingorttingoftheintendedbranch-circuit

overcurrent-protectivedeviceforthetimesspecifiedinTable13;and

b)Threesamplesaresubjectedtoalimited-short-circuittestusingatestcurrentasspecifiedinTable14whileconnected

inrieswithanonrenewablefuratedinaccordancewithTable13.

Note:Whenafuthatissmallerthanthatindicatedin(a)and(b)isudintheunitforprotectionofthecircuittowhich

thebondingconductorisconnected,thenthemagnitudeofthetestcurrentandsizeoffuudduringthetestistobe

badontheratingofthesmallerfu.

21.2ThetestcircuitdescribedinClau21.1(b)shallhaveapowerfactorof0.9–1.0andaclod-circuittestvoltageas

n-circuitvoltageshallbe100–105percentoftheclod-circuitvoltage.

21.3Withthebondatnormaloperatingtemperature,thecurrentshallbeappliedfromdeadmetalpartintendedfor

groentialdropshallbemeasured

betweenthegroundedpartandgroundingterminalmeansattheendofthisperiod.

21.4Resultscomplywhen:（检验依据）

a)Themeasuredpotentialdropdoesnotexceed4V;

b)Thebondingconnectiondoesnotopen;and

c)Thereisnoevidenceofmeltingofanymetalbondnorheatingorburningthatwouldcreateariskoffireorshockhazard.

22MoistureAbsorptionTest（吸湿试验）

22.1Asampleofmaterialrequiredtoberesistanttomoistureshallnotabsorbmorethan10percentofthewaterbymass

when:

a)Driedat1055°C(22141°F)for1hour;

b)Immerdinwaterat231°C(73.433.8°F)for24hours;and

c)Removedfromthewaterwithsurfacewaterwipedoff.

23Hot,FlamingOilTest（灼烧试验）

23.1Constructions,includingaventilatedbottompanel,notmeetingtherequirementsinClau6.6.4shallbeevaluated

byconductingthetestsdescribedinClaus23.2–23.5.

23.2Openingsinabottompanelshallbesmallinsize,fewinnumber,andarrangedsothathot,flaming

No.2fueloilpouredthreetimesontotheopeningsfromapositionabovethepanelixtinguishedasitpassthroughthe

openings.

23.3Asampleofthecomplete,finishedbottompanelshallbesupportedinahorizontalpositionashortdistanceabovea

horizontalsurfaceunderahood(orinanotherareathatisventilatedbutfreefromdrafts).Bleachedcheeclothrunning28

–30m2/kgmass(14–15yd2/lb)andhaving,foranysquareinch,32threadsinonedirectionand28intheother,shallbe

drapedinonelayeroverashallow,shallbesizedandshapedtocovercompletelythepattern

ofopeningsinthepanelbutnotsolargeastocatchanyoftheoilthatdoesnotpassthroughtheopeningsorrunsoverthe

shallbepositi

centerofthecheeclothshallbe50.8mm(2in)belowtheopenings.

Note:Uofametalscreenorwired-glasnclosuresurroundingthetestareaisrecommendedtoreducethelikelihood

ofsplatteringoil,causinginjurytotestpersonnel.

23.4Asmallmetalladlenomorethan63.5mm(2.5in)indiameter,withapouringlipandalonghandlewholongitudinal

axisremainshorizontalduringpouring,shallbepartiallyfilledwith10cm3(0.61in3)ofNo.2fueloil,whichisa

medium-volatiledistillatehaving:

a)AminimumAPIgravityof30degrees,

b)Aflashpointof43.3–87.7°C(110–190°F),and

c)Anaveragecalorificvalueof38.2MJ/L(136,900Btupergallon).SeeStandardSpecificationforFuelOils,ASTMD396.

shallflamefor1minuteandthenshallbe

pouredattheapproximaterateof,butnotlessthan,1cm3(0.061in3)percondinasteadystreamontothecenterofthe

patternofopeningsfromaposition102mm(4in)shallnotignitethecheecloth.

23.5Fiveminutesaftercompletionofthepouringoftheoil,thecheeclothshallbereplacedwithacleanpieceanda

cond10cm3(0.61in3)ofhot,flamingoilshallbepouredfromtheladleontotheopenings.

nuteslater,

cheeclothshallnotigniteduringanythreepourings.

24EnclosureTests（外壳试验）

24.1General

24.1.1ForadditionalenclosurerequirementsnotreferencedinthisClau,ePart2andPart3.

24.2Compressiontest（压缩试验）

24.2.1Anoutsideforceof444N(100lbs)shallbedirectedtowardtheinsideofthetransformeroneachofthefivesurfaces

oftheasmbledtransformerenclosure.(Thetransformercoreandcoilneednotbeinstalledintheenclosureduringthis

testunlessthecoreandcoilarenecessarytomaintainthestructuralstrengthofthefinishedtransformer.)Theforceshall

beappliedgradually905degreestoeachofthethinnermetalsurfacesinanyareathatismostlikelytocauthe

ceshallbetransmittedthrougharodhavingaflatsteelfacewitha12.7mm(0.5in)square

hallnotbeinwarddeflectiongreaterthan12.7mm.

24.3Outletboxcoversupportandimpacttests（接线盒盖的支撑和挤压试验）

24.3.1General

24.3.1.1Whenatransformerisprovidedwithanendbelloranonmetalliccoverintendedtocoveranoutletboxas

describedinClau6.7.2,thecovershallbesubjectedtothetestsdescribedinClaus

onclusionofthetest,thecovershall

withstandapotentialof2V+1000V(appliedasdescribedintheDielectricVoltage-WithstandTestinClau29ofPart2

orDielectricVoltage-WithstandTestinClau32ofPart3)testvoltagespecifiedin

Table12.（试验完后还要进行电气性能试验）

24.3.2Support

24.3.2.1Onesampleofthetransformerandcovershallbemountedonanoutletboxandsubjectedtoapplicationofa

weightthreetimestheweightofthetransformerusingbothconfigurationsshowninFigure5.

24.3.3Impact

24.3.3.1Threesamplesofthetransformerandcover(includingendbells)shallbesubjectedtoasingleimpactof7J(5

ft-lbs)actshallbeproducedasshowninFigure6by:

a)Droppingasteelsphere51mm(2in)indiameterandweighing0.535kg(1.18lbs)fromaheightof1.3m(51in)or

b)Suspendingthesteelspherefromacordandswingingitasapendulum,droppingthroughaverticaldistanceof1.3m.

24.4Polymericenclosureimpacttest（聚合体的外壳挤压试验）

24.4.1Whenapplicable,polymericenclosuresreferencedinClau6.2.3shallbesubjectedtothefollowingtestsspecified

inClaus24.4.2–24.4.4.

24.4.2Threesamplesshalleachbesubjectedtoanimpactonanysurfacethatixpodtoablowduringnormaluor

nclosurewithnosideorfacehavingasurfaceareaexceeding25,800mm2(40in2),theimpact

shallbe6.78N•m(5ft/lbs).Theimpactshallbeproducedbydroppingasteelsphere,51mm(2in)indiameterwithamass

of0.53kg(1.2lb),fromaheightof1300mm(4.3ft.).Foranenclosurehavinganysurfaceareaofmorethan25,800mm2,

theimpactshallbe13.56N•m(10ft/lbs).Thesteelsphereshallbedroppedfromaheightof2600mm(8.5ft).Testsareto

beconductedatanyambienttemperaturewithintherangeof10–40°C(50–104°F).

Note:Atthemanufacturer’sdiscretion,onesampleofthetransformermaybesubmittedandsubjectedtothreeimpacts

whereapplicable.

24.4.3Threesamplesshalleachbecooledto0°C(32°F)andmaintainedatthattemperaturefor3hoursImmediately

followingremovalfromthecoldchamber,eachsampleshallbesubjectedtotheappropriateimpactdescribedinClau

24.4.2.

24.4.4AsaresultofthetestsdescribedinClaus24.4.2and24.4.3,theimpactsshallnot:

a)Reducespacingsbelowtheminimumrequiredvalues;

b)Makeanybarelivepartsorinternalwiringaccessible;

c)Haveanundueadvereffectontheinsulation;and

d)Produceanyotherconditionthatmightincreaariskofshockorfire.

25InducedPotential（感应试验）

25.1WhileheatedasindicatedinthespecifictestconditionnotedinInducedPotentialinClau29.2ofPart2orInduced

PotentialinClau32.2ofPart3,atransformershallbesubjectedtotheapplicationofanalternatingpotentialbetweenthe

terminaentialshallbetwicetherated

quencyoftheappliedpotentialshallbeminimumtwicetheratedfrequencyofthe

hallnotbedielectricbreakdown.

25.2ThetestvoltagenotedinClau25.1shallbestartedatone-quarterorlessofthefullvalueandincreadtofullvalue

eingheldforthetimespecified,thevoltageshallbereducedtoone-quarterofthe

cuitshallthenbeopened.

26Temperature(Heating)Test（温升试验）

26.1Requirementsrelatingtoheatingshallbebadonanambientairtemperatureof25°C(77°F).Whenatemperature

testisconductedatanyambientairtemperature,thevariationfrom25°Cshallbeaddedtoorsubtractedfromtheobrved

temperaturereading.

26.2Temperaturesshallbemeasuredbymeansofthermocouplesunlessitisspecificallystatedthattemperature

ocouplemeasuredtemperatureisconstant

whenthreesuccessivereadings,takenatintervalsof10percentofthepreviouslyelapddurationofthetest(butatnot

lessthan5minuteintervals),ctionofthethermocoupleshallcurelycontactthepointofthe

rmocoupleshallconsistofwiresnotlargerthan24AWG(0.21mm2).(对热电偶测量点和

测量稳定的要求)

Note:Wherethethermocoupleisudtomeasuretemperaturesofelectricallylivepoints,electricalinsulationmayhavea

maximumthicknessof0.71mm(0.028in)betweenthethermocoupleandthelivepoints.

26.3Whenthermocouplesareudtodeterminetemperaturesregardingtheheatingofelectricaldevices,itshallbe

standardpracticetouthermocouplesconsistingof30AWG(0.05mm2)ironandconstantanwiresanda

uipmentshallbeudwheneverrefereetemperaturemeasurementsare

rmocouplewireshallcomplywiththerequirementsforspecialthermocouplesspecifiedinthetableof

errorlimitsforthermocouplesfoundinTemperatureMeasurementThermocouples,ISAMC96.1.（对热电偶说明）

26.4Thetemperatureriofacopperoraluminumwindingshallbedeterminedbythechange-of-resistancemethodusing

thefollowingformula(windingsaretobeatroomtemperatureatthestartofthetest):inwhich:

tisthetemperatureri,

Ristheresistanceofthecoilattheendofthetest,

ristheresistanceofthecoilatthebeginningofthetest,

kis234.5forcopperand225.0foraluminum,

t1istheroomtemperatureindegreesCatthebeginningofthetest,and

t2istheroomtemperatureindegreesCattheendofthetest.

26.5Shortlengthsofconductorsmaybeexpodtotemperaturerishigherthanthoshownintherespective

TemperatureTesttableswhensupplementaryheat-resistinginsulationofadequatedielectricstrengthisudoverthe

insulationtosafeguardagainstdeterioration.（绝缘安全）

LowVoltageTransformers–

Part2:GeneralPurpo

Transformers

5085-2

18Tests(试验)

18.6Reprentativesamplesofatransformershallbesubjectedtothetestsnotedbelowinthefollowingorder:

（对样品试验的要求）

Singlesample:VoltageMeasurementTest,Clau27;ImpedanceTest(ifapplicable),Clau28;Temperature(Heating)

Test,Clau26;DielectricVoltage-WithstandTest,Clau29;OverloadTest,Clau30;RepeatedDielectric

Voltage-WithstandTest,Clau31.

（试验类别）

Thefollowingalternatetestmethodcanbeudwithtwosamples:

a)Firstsample:VoltageMeasurementTest,Clau27;ImpedanceTest(ifapplicable),Clau28;Temperature(Heating)

Test,Clau26;DielectricVoltage-WithstandTest,Clau29.

b)Secondsample:VoltageMeasurementTest,Clau27;OverloadTest,Clau30;RepeatedDielectric

Voltage-WithstandTest,Clau31;DielectricVoltage-WithstandTest,ClauA1ofAnnexA.

18.7Whenatransformerhasitsoutputratedinvolt-amperes,thefull-loadcondarycurrentshallbedeterminedas

follows:

a)Forasinglephatransformer:Amperes=(Volt-amperes)/outputvolts

b)Forathreephatransformer:Amperes=(Volt-amperes)/√3*outputvolts

lalsobesubjectedtotheLiftingandMountingMeansTestspecifiedinClau

etransformerweighsmorethan45kilograms(100lbs),itshallbemarkedinaccordancewithClau17.4.3.

（对变压器重量的要求）

18.9ResultsobtainedfromthetestsdescribedinClaus26–36performedontransformerswithaluminumwindingscan

beudtoreprenttransformerswithcopperwindings,aslongasthesizeandnumberofwindingsofthecopper

r,resultsoftestsconductedontransformerswithcopper

windingscannotbeudtoreprenttransformerswithaluminumwindings.（铜芯和铝芯绕组变压器不能互相替代）

21BondingConductorTest（导体焊接试验）

21.5InadditiontotheapplicablerequirementsspecifiedinPart1,cord-connectedtransformersshallbesubjectedtothe

followingtest.A60Hzcurrentoftwicetheratingoftheattachmentplugcap,butnotlessthan30A,shallbeapplied

betweenadeadmetalpartintendedforgroundingandthegroundingterminalmeansfortheperiodspecifiedinTable13of

tialdropshallbemeasuredbetweenthegroundedpartandgroundingterminalmeansattheendofthis

period.

21.6Resultscomplywhen:（对焊接要求）

a)Themeasuredpotentialdropdoesnotexceed4Vand

b)Thereisnoevidenceofmeltingofanymetalbondnorheatingorburningthatwouldcreateariskoffireorelectricshock.

26Temperature(Heating)Test（温升试验）

26.6Withtheframeorenclosuregrounded,atransformershalloperatecontinuouslyatthetestvoltagespecifiedinTable

12ofPart1andrti-taptransformers,the

etransformerisratedforarangeoffrequencies,(suchas50–

60Hz),ormersrated50/60Hzshallbe

testedateither5tshallbeconducted

facetemperatureriorthetemperatureriofthecoilwindingsshallnot

exceedthevaluesspecifiedinTables8and9.（温度要求）Thereshallbenodegradationoftheinsulationsystemorany

partofthetransformer.（温升试验对电压分接频率和绕组温度绝缘系统要求注意：表8和表9）

Note:Thesurfacetemperatureriorthetemperatureriofthecoilwindingsmaybedeterminedusingmethodsspecified

intheStandardTestCodeforDry-TypeDistributionandPowerTransformers,ANSI/IEEEC57.12.91.

26.7InthetestmentionedinClau26.6,dshallbeadjusteduntilfullload

15minutesofoperation,theloadshallbereadjusted,whennecessary,torestorethecurrent

tofullloadvalue,gtemperatureris(fordeterminingthe

temperaturesonthewindinginsulation)shallbemeasuredbytheresistancemethod.（电阻法测量温升）

26.8Tosimulate（模拟条件）fieldconditionsforthistest,copperconductorssizedfor100percentfullloadcurrentbad

ona75°C(167°F)ampacityshallbeudfortransformerconnection.

Note:Conductorsmaybesizedonabasisof60°C(140°F)ampacityifthetransformerismarkedinaccordancewith

Clau17.5.4(b)or(d).

26.9Aferroresonanttransformerhavinga(marked)primaryvoltagerangeshallbetestedatthevoltageresultinginthe

greatestinputpowerconditionasdeterminedbythetestspecifiedinClau18.3ofPart1.（对电压电流频率）

Aferroresonanttransformerhavingmultipleprimaryorcondaryvoltageratings,orboth,shallbetestedatthevoltage

resultinginthegreatestinputpowerconditionasdeterminedbythetestspecifiedinClau18.3ofPart1.

26.10Thetemperatureriontheenclosureofatransformerintendedforwallmountingshallnotbegreaterthan80°C

duringtheheatingtestwhen:（对外壳温度的要求）

a)ThetemperaturetestisconductedwiththetransformermountedinanalcoveasdescribedinClau26.11andFigure1;

b)Thetemperatureriatanypointontheinnersurfacesofthealcoveisnotgreaterthan65°C;and

c)ThetransformerismarkedinaccordancewithClau17.4.7.

26.11ThesidewallandthetopofthetestalcovereprentedinFigure1shallconsistof9.5-mm(0.374-in)thickfir

rwall(onwhichthetransformerismounted)shallbeof19.1-mm(0.75-in)er

surfacesofthetestalcoveshallbepainteddullblack,

horizontaldimensionsofthewallsandtopshallextendbeyondthetransformerbyatleast30.5cm(1ft).

27VoltageMeasurementTest

27.1ForpurposofcomparisonwithvoltagesmeasuredasdescribedinClaus30.1and30.2,eachcondary

open-circuitvoltageshallbemeasuredwiththeprimaryconnectedtoatestvoltageandfrequencysupplysourceas

indicatedinTable12ofPart1andClau18.4ofPart1respectively.

28ImpedanceTest

28.1Thepercentimpedanceofatransformerrated25kVAormoreshallbedeterminedinaccordancewiththeStandard

TestCodeforDry-TypeDistributionandPowerTransformers,ANSI/kedvaluemaybeudifitis

within±erminedvalueshallbecorrectedtothetransformertemperatureri

plus20°Casshowninitem13ofTable8andTable9.

29DielectricVoltage-WithstandTest

29.1Appliedpotential

29.1.1Within5minutesoftheterminationoftheTemperature(Heating)TestinClau26,atransformershallbesubjected

for1minutetotheapplicationofapotentialbetweeneachwindingandeveryotherwindingofthetransformerandbetween

minal

endsandtapsofthewindingundertestshallbeelectricallyconnectedtoeachotherandtooneoutputterminalofthe

erterminalsandparts(includingcoreandenclosure)shallbeconnectedtotheotherterminalofthe

hallnotbedielectricbreakdown.

ForatransformerprovidedwiththemarkingdescribedinClau17.5.2,theappliedpotentialshallbebadonthevoltage

tentialshallbeappliedbetweeneachwinding

andmetalofthecoreandenclosureandbetweeneachwindingandeveryotherwindingthatmightnotbeinvolvedinthe

formerwithmultifilarwindingsmarkedasspecifiedinClau17.5.14shallbesubjectedtoapotentialof

1500Vbetweenwindingsintendedtobeconnectedinparallelorinries.

Note1:Whenthecoreand/orcoilareinsulatedsoasnottobeaccessible,connectionofthecoretothetestingtransformer

isnotrequired.

Note2:Multifilarconstructedcoilctionsdesignedforriesorparallelconnectionssubjectedtotheinducedpotential

testsdescribedinClau29.2.1neednotbesubjectedtotheappliedpotentialrequirementsofTable11.

29.1.2Whenthetransformerhasanextendedwinding,theratedvoltageindicatedinTable11shallincludethevoltageof

theextendedportionofthewinding,eventhoughbothterminalsoftheextendedportionarenotavailableforexternal

connection.

29.1.3Thetestpotentialshallbesuppliedfroma500VAorlargercapacitytransformer,theoutputvoltageofwhichis

liedpotentialshallbeincreadfromzerountiltherequiredtestlevelis

reaintheappliedpotentialshallbeatauniformrateasrapidas

hallbenodielectricbreakdown.

29.1.4Themachineudtomeasuredielectricbreakdownshallbeadjustedsothatthensitivityisnolessthan5mA

whenthetestvoltageisappliedtotheproduct.

29.2Inducedpotential

29.2.1Whileinaheatedcondition,tageandpotentialshallbeas

formerwithtwoormorewindings(markedasdescribedinClau

17.5.14)forautotransformeroperationshalladditionallybetestedinthismannerwiththetransformerconnectedforsuch

lti-windingtransformerthespecifiedtestvoltageshallbeappliedtoeachwinding

hallnotbeadielectricbreakdownasaresultofthistest.

30OverloadTest

30.1Atrbilizedsurfaceorcore

temperaturerecordedonthetransformerduringthecond50percentloadoperationshallnotbemorethan5°C(9°F)

greaterthanthestabilizedcn-circuitoutput

voltagedeterminedfollowingthefinal50percentloadoperationshallbewithin2percentoftheoutputvoltagemeasured

tion,aprotectivedevice,ifprovided,maybebypasdwhen

conductingthistest.

30.2ThetransformershallbeoperatedasdescribedintheTemperature(Heating)TestinClau26,

exceptthattheloadshallbe50percentoftheratedvalue,untilthecoreor(ifencapsulated)surface

tabilization,theloadshallbeadjusteduntil200percentofratedcondary

2minutesofoperation,theloadshallbereadjusted,ifnecessary,torestorethe

currentto200percent,ationofthisoverload

lbe

heldatthatvalueuntilthecoretemperatureagainstabilizesoruntilthetemperaturedropstowithin5°C

(9°F)oftheoriginalstabilized50-percentload-currenttemperature(whicheveroccursfirst).This

temperaturevalueshallbecomparedwiththeoriginal50-percentloadstabilizedcondition,asspecifiedin

,eprimaryenergized,thecondary

voltage(s)shallbemeasuredandcomparedwiththeoriginaloutputvoltagemeasurements.

Whenthecoreofthetransformerisnotaccessiblefordirecttemperaturemeasurement(duetothe

transformerconstructionorreasonssuchancapsulationorfillingwithelectricalinsulatingmaterial),the

tionoftheenclosuresurfaceudtomeasure

thistemperatureshallbethehottestspotoccurringinthe100-percentloadheatingtest.

Aprotectivedevice,whenprovided,shallbebypasdwhenthedeviceopenswhiletheloadisadjusted

afterthesurfacetemperatureshavestabilized.

31RepeatedDielectricVoltage-WithstandTest

31.1FollowingtheOverloadTestinClau30,thetransformershallbesubjectedtoarepeateddielectric

his

test,thetransformershallperformasintended.

32MaximumOutputPowerandShortCircuitTestsforLine-ConnectedTransformers

32.1Whensuppliedatitsmaximumratedinputvoltage,atransformershallnotemitflameormolten

metalandshallnotbecomeashockhazardwhenoperatedundershortcircuitconditionsorwhen

deliveringmaximumoutputpowerforonehour,oruntiltheconditionsdescribedinClaus32.2or32.3

areachieved.

32.2Ifthetestisinterruptedbyarettabledevice,thetestshallberepeatedunderthatabnormal

conditionfor50cyclesofoperation.

32.3Ifthetestisinterruptedbytheopeningofanapprovedfu,

resultsshallbeconsideredacceptablewhenthecriteriaspecifiedinClau32.1aremet.

33ShortCircuitTestonTransformerswithOutputReceptacles

33.1Atransformerwithoutputreceptacles,whentestedasspecifiedinthefollowingclaus,shallnot

atelyafterthetest,thetransformer

shallbesubjectedtotheAppliedpotentialtestinClau29.1.

33.2Duringthistesteachtransformershall:

a)Beplacedontwolayersofbleachedcheeclothrunning26to28m2/kgandhavingwhatis

knowntothetradeasacountof32by28;

b)Haveallexpoddeadmetalpartsconnectedtogroundthrougha3Anon-time-delayfu;

and

c)Beconnectedinacircuitwithasupplycircuitfuratedattwicetheampacityofthe

attachmentplug.

33.3ThetransformershalloperateatthevoltageandfrequencyspecifiedinTestsinClau18ofPart

r,whentheratedinputvoltageofthetransformerisspecifiedasarange,thetestshallbedone

tputofthetransformershallbeshortcircuitedinturnwithother

tshallbecontinuedfor7hoursoruntilanovercurrentprotectivedevice

operates.

esofahazardousconditionare:

a)Anopeningofthesupplycircuitfu;

b)Anopeningofthegroundfu;

c)Glowingofthecheecloth;

d)Emissionofflameormoltenmaterialfromtheenclosure;

e)Exposureoflivemetals;or

f)DielectricbreakdownasaresultoftheAppliedpotentialtestinClau29.1

34MaximumOutputPowerTestonTransformerswithOutputReceptacles

34.1Atransformerwithoutputreceptacles,whentestedasspecifiedinClau34.2,shallcomplywith

thetestrequirementsofClau34.3.

r,insteadofshort

circuitingtheoutput,aresistiveloadshallbeconnectedtotheoutputandtheloadshallbeadjusteduntil

dshallbereadjustedafter15minutesofoperation,

whennecessary,r,nofurtheradjustmentshall

stshallcontinueforaperiodof7hoursoruntilanovercurrentprotectivedevice

operates.

onally,the

atelyafterthetestthetransformershallbe

subjectedtothedielectrictestinAppliedpotentialinClau29.1.

35LeakageCurrentTest

35.1Theleakagecurrentofacord-connectedtransformerwhentestedinaccordancewithClaus35.2

–35.6shallnotbemorethan0.5mAforanon-stationarytransformeror0.75mAforastationary

transformer.

Aunitthatisrequiredtohaveprimary-circuitfilteringtomeettheapplicableelectromagneticcompatibility

(EMC)regulationsmayhavehigherleakagecurrentlevelsataccessiblepartsprovidedthattheunit

complieswiththefollowing:

a)Leakagecurrentdoesnotexceed5.0mAandtheunitcomplieswiththegrounding

requirementsinGroundinginClau10ofPart1or

b)Leakagecurrentdoesnotexceed5percentoftheinputcurrentdeterminedinaccordance

withthePowerInputTestinClau36,andallofthefollowingconditionsaremet:

1)TheunitcomplieswiththegroundingrequirementsinGroundinginClau10ofPart1;

2)Theunitisnotsuppliedthroughastandardconfiguration125V,15Anor125V,20Anon-lockingtypeplug;

3)Provisionismadeforconnecting,andearth-grounding,allthemetalframesofthetransformer;and

4)Suitableinstallationinstructionsareprovided.

multaneously

accessible,theleakagecurrentsfromthesurfacesshallbemeasuredtothegroundedsupplyconductor

reconsideredtobeexpod

surfacesare

consideredsimultaneouslyaccessibleiftheycanbereadilycontactedbyoneorbothhandsofaperson

easurementsdonotapplytooutputterminalsoperatingatvoltageslessthan

30Vrms(42.4Vpeak)laccessiblesurfacesarebondedtogetherandconnectedto

thegroundingconductorofthepowersupplycord,theleakagecurrentshallbemeasuredbetweenthe

groundingconductorandthegroundedsupplyconductor.

35.3Whenaconductivesurfaceotherthanmetalisudfortheenclosureorapartoftheenclosure,the

leakagecurrentshallbemeasuredusingametalfoilwithanareaof10x20cm(3.9x7.9in)incontact

esurfaceislessthan10x20cm,themetalfoilshallbethesamesizeasthe

alfoilshallnotremaininplacelongenoughtoaffectthetemperatureofthepowerunit.

35.4Thecircerthat

isactuallyudforameasurementneedonlyindicatethesamenumericalvalueforaparticular

erudneednothavealltheattributesofthe

surementinstrumentshallcomplywithallofthefollowing:

a)Themetershallhaveaninputimpedanceof1500ohmsresistiveshuntedbyacapacitance

of0.15microfarad.

b)Themetershallindicate1.11timestheaverageofthefull-waverectifiedcomposite

waveformofvoltageacrosstheresistororcurrentthroughtheresistor.

c)Overafrequencyrangeof0–100kHz,themeasurementcircuitshallhaveafrequency

respon–ratioofindicatedtoactualvalueofcurrent–thatiqualtotheratioofthe

indicationof0.5or0.75mA,themeasurementshallnothaveanerrorofmorethan5percentat

60Hz.

35.5Unlessthemeterisbeingudtomeasureleakagefromonepartofatransformertoanother,the

metershallbeconnectedbetweenanaccessiblepartandthegroundedsupplyconductor.

35.6Asampleofthetransformershallbetestedforleakagecurrentstartingwiththeas-received

condition(theas-receivedconditionmeaningtheunithasnotbeenenergizedexceptforoccurrencesthat

arepartoftheproduction-linetesting)butwiththegroundingconductor,ifany,openattheattachment

plyt

quence,withreferencetothemeasuringcircuit,Figure2,shallbeasfollows:

a)WithswitchS1open,thetransformershallbewithoutloadandconnectedtothemeasuring

kagecurrentshallbemeasuredusingbothpositionsofswitchS2andwithany

switchingdevicesinalltheiroperatingpositions.

b)SwitchS1shallthenbeclodenergizingthetransformerandwithin5condstheleakage

currentshallbemeasuredusingbothpositionsofswitchS2,andwithanyswitchingdevicesin

alltheiroperatingpositions.

c)sitionsofswitchS2

lstabilizationshallbeobtainedbyoperation

asinthetemperaturetest.

22CSAC22.2NO.66.2-06¨UL5085-2APRIL17,2006

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35.7Ingeneral,thecompleteleakagecurrenttestprogramasdescribedinClau35.6shallbe

econcurrenceofthoconcerned,theleakage

currenttestsmaybeinterruptedtoconductothernondestructivetests.

36PowerInputTest

36.1Thecurrentinputtoacord-connectedtransformer,whenconnectedtoasupplyadjustedtothetest

voltagespecifiedinTable12ofPart1,

transformershallbeloadedtoratedoutputandthecurrentmeasuredwithinoneminuteoftheapplication

oftheload.

37LiftingorMountingMeansTest

37.1TheliftingormountingmeansofatransformersspecifiedinClau5.3ofPart1orClau6.4.3of

Part1,respectively,shallbesubjectedtothedirectapplicationofaforceequaltoaminimumoffourtimes

theweightofthetransformer(theweightofthetransformerplusaforceofthreetimestheweightofthe

transformer).

37.2Whenthereismorethanonehook,bracket,orholeintendedforuwithaliftingcable,thetestshall

bleunderloadshall

derbarshallnotbeudwith

ure3foranexampleofatypicaltestt-up.

37.3Theforceshallbegraduallyappliedbetweenthehole,hook,orbracketandthatpartofthe

transformertowhichitiscured(byanyconvenientmeans).Theforceshallbemaintainedfor5minutes.

Forconvenience,thesampleudforthistestmayconsistofonlytheportionoftheenclosurecontaining

thelifthallnotbe

breakageoftheliftingormountingmeans.

38StrainReliefTest

38.1WhererequiredbyClau15.3,leadsandflexiblecordsshallbesubjectedtoadirectpullapplied

for1minuteasfollows:

a)Foroutputcordswheretheoutputvoltageislessthan30Vac,theforceshallbe89N(20

lbs);

b)Forinputandoutputcordsotherthan(a),theforceshallbe156N(35lbs);and

c)Forleads,theforceshallbeequaltotheweightofthetransformerbutnotlessthan13N(3

lbs)normorethan45N(10lbs).

Thereshallnotbeindicationofstressontheconnectionsinsidethetransformer.