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Technicalspecificationofexternalcircuit-breaker

forelectricitymeters

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T/CEC—XXXX

Technicalspecificationofcircuit-breakersforelectricitymeters

1Scope

Thisstandardstatestheclassification,typeofstructure,technicalrequirements,testmethodsandsoonof

theexternalcircuit-breakersforelectricitymeters(hereinafterreferredtoascircuit-breaker).

Thisstandardappliestoa.c.circuit-breakerforoperationat50Hz,60Hzor50/60Hz,hacingarated

voltagenotexceedingAC400?V,aratedcurrentnotexceeding125?A，andratedshort-circuitbreaking

capacitynotlessthan6000?A.

2Normativereferences

Thefollowingdocumentsareindispensablefortheapplicationthisdocument.Fordatedreference,only

theeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includingany

amendments)applies.

GB/T1804—2000GeneraltolerancesTolerancesforlinearandangulardimensionswithoutindividual

toleranceindications

GB10963.1—2005Electricalaccessories-Circuit-breakersforovercurrentprotectionforhouseholdand

similarinstallation-Part1:Circuit-breakersfora.c.operation

GB14048.1-2012Low-voltageswitchgearandcontrolgear--Part1:Generalrules

GB/T17626.2—2006Electromagneticcompatibility（EMC）--Testingandmeasurement

techniques--Electrostaticdischargeimmunitytest

GB/T17626.4—2008Electromagneticcompatibility-Testingandmeasurementtechniques--Electrical

fasttransient/burstimmunitytest

GB/T17626.5—2006Electromagneticcompatibility-Testingandmeasurementtechniques--Surge

immunitytest

GB17701—2008Circuit-breakerforequipment

GB/T19334—2003Dimensionoflow-voltageswitchgearandcontrolgear--Standardizedmountingon

railsformechanicalsupportofelectricaldevicesinswitchgearandcontrolgearinstallations

GB/T20645—2006Specificenvironmentalcondition--Technicalrequirementsoflow-voltage

apparatusesforplateau

GB/T26572—2011Requirementsofconcentrationlimitsforcertainrestrictedsubstancesinelectrical

andelectronicproducts

IEC62055-31:2005Electricitymetering--Paymentsystems--Part31：Particularrequirements--Static

paymentmetersforactiveenergy(classes1and2)）

3Termsanddefinitions

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Forthepurposeofthisdocument,thetermsanddefinitionsgiveninGB14048.1—2012,aswellasthe

followingapply.

3.1

circuit-breaker

Mechanicalswitchingdevice,capableofmaking,carryingandbreakingcurrentsundernormalcircuit

conditionsandalsomaking,carryingforaspecifiedtimeandbreakingcurrentsunderspecifiedabnormal

circuitconditions(suchasshort-circuitcondition).

[SOURCE:GB14048.1,2.2.11]

3.2

externalcircuit-breakerforelectricitymeters

Thecircuit-breaker，installedexternallyandcooperatedwiththeelectricitymetertocontrolitsopening

andclosingoperation.

3.3

automaticopeningandclosingoperation

Openingandclosingoperationofthecircuit-breakerthat,bymeansofremotecontrolsignalsfrommaster

stationorotherequipment.

(Operationofopeningorclosingthecircuitbreakerbyremotecontrolsignalsfromthemasterstationor

otherequipment)

3.4

automaticopeningandclosingtime

Timemeasuredfromtheinstantatwhichthecircuit-breakerreceivestheopeningorclosingsignaltothe

instantwhenopeningorclosingoperationisaccomplished.

3.5

innershaftdrivemode

Drivingmodethatenableseachpoletooperatetogetherbymeansofintegralshaftinthecircuitbreaker.

3.6

power-ondelaytime

Theintervaltimebetweenthepowering-upandreadyforresponsetocontrolsignal.

(Thedurationfromtheinstantofpower-ontotheinstantatwhichthebreakerisreadytorespondtoa

controlsignal)

3.7

synchronoustime

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Thetimeperiodamongeachpoleofthecircuit-breakertocompleteitsopeningorclosingoperation.

(Timedifferenceamongallpolesofabreakertocompleteitsopeningorclosingoperation.)

4Classificationandperformancerequirements

4.1Classification

4.1.1

Accordingtothenumberofpoles

Accordingtothenumberofpoles:

a)1P+N,two-polecircuit-breakerswithoneprotectedpole;

b)2P,two-polecircuit-breakerswithtwoprotectedpoles;

c)3P,three-polecircuit-breakerswiththreeprotectedpoles;

d)3P+N,four-polecircuit-breakerswiththreeprotectedpoles;

e)4P,four-polecircuit-breakerswithfourprotectedpoles.

Note:Thepolewhichisnotaprotectedpolecanbe“switchedneutral”.

4.1.2

Accordingtoinstallationmethods(Accordingtothemethodofmounting）

a)Surface-type;

b)Flush-type;

c)Panelboardtype,alsoreferredtoasdistributionboardtype.

Note:Thesetypesmaybeintendedtoberailmounted.

4.1.3

（Accordingtothemethodofcontrol）

Accordingtothemethodofcontrol:

a)Manualcontrol,tocloseandopenmanually

b)Semi-automaticcontrol,toclosemanuallyandopenautomatically,

c)Automaticcontrol,tocloseandopenautomatically,

d)Semi-automaticorRemoteautomaticcontrolselectionmode,Havingmodeswitchforselectionof

manualorautomaticmode.Wheninmanualmode,functioningasinremotesemi-automaticcontrol

mode.Wheninautomaticmode,functioningasinremoteautomaticcontrolmode.

4.1.4

Accordingtotheinstantaneoustrippingcurrent

a)B-type;

b)C-type;

c)D-type.

Note:Theselectionofaparticulartypecandependontheinstallationrules.

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4.2.1Characteristicsrequirements

4.2.2Controlsignalvoltage

TheratedcontrolsignalvoltageshallbeAC220V.

4.2.2Ratedvoltage（Ue）

PreferredvaluesofratedvoltagearegiveninTable1.

Table1Preferredvaluesofratedvoltage

Ratedvoltageofcircuit-breakersRatedvoltageof

Circuit-breakerforuseinsystems230?V、circuit-breakersforusein

Circuitsupplyingthecircuit-breaker

s230/400?V、400?Vsystems240?V

VV

Singlephase(phasetoneutralorphase

230/

tophase)

Three-phasefour-wire230/

SinglepoleSingle-phase（phasetoneutral）

orthreephase，usingthreesingle-pole

230/400/

circuit-breakers（three-wireor

four-wire）

Singlephase（phasetoneutralor

230/

phasetophase）

Singlephase（phasetophase）400240

Two-pole

Singlephase（phasetophase,

/240

three-wire）

Threephase（four-wire）230/

Three-phase（three-wireor

Three-pole400240

four-wire）

Four-poleThree-phase（four-wire）400/

Note1：InIEC60038，thenetworkvoltagevalueof230/400?Vhasbeenstandardized.Thisvaluewillprogressively

supersedethevaluesof220/380?Vand240/415?V.

Note2：Whereverinthisstandardthereisareferenceto230?Vor400?V,theycanbereadas220?Vor240?V,380?Vor

415?V,respectively.

Note3：Whereverinthisstandardthereisareferenceto240?V,theycanbereadas200?V.

4.2.3Ratedinsulationvoltage（Ui）

Theratedinsulationvoltageshallnotbelessthan500?V.

4.2.4Ratedimpulsewithstandvoltage（Uimp）

Theratedimpulsewithstandvoltageshallnotbelessthan6?kV.

4.2.5Ratedcurrent（In）

Preferredvaluesofratedcurrentare:40?A,63?A,80?A,100?Aand125?A.

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4.2.6Ratedfrequency（fn）

Standardvaluesofratedfrequencyare50?Hzand60?Hz.

4.2.7Ratedshort-circuitcapacity（Icn）

Theratedshort-circuitbreakingcapacityshallnotbelessthan6000?A.

4.2.8Automaticclosingtime（tc）

tc≤3?s。

4.2.9Synchronoustime

Thesynchronoustimeofacircuit-breakershallmeettherequirementsofitsproductspecification.

4.2.10Power-ondelaytime（te）

Thepower-updelaytimeofcircuit-breakersshouldbesatisfiedwiththerequirementsoftheproduct

specification.

(Thepower-ondelaytimeofacircuitbreakershallmeettherequirementsofitsproductspecification.)

4.2.11Ratedcontrolsignalvoltage（Uc）

TheratedcontrolsignalvoltageshallbeAC220?V.

4.2.12Controlsignalcurrent（Ic）

Ic≤1?mA。

4.2.13Closingphaseleakagecurrent（IL1）

Steady-statecurrentlossperphaseshallbelessthan0.2?mAwhenthecontrolunitsareattheclosed

position.

4.2.14Openingphaseleakagecurrent（IL2）

Steady-statecurrentlossperphaseshallbevlessthan0.2?mAwhenthecontrolunitsareattheopen

position.

4.2.15Powerloss

Themaximumpermissiblevaluesperpoleofcircuit-breakersareindicatedinTable2.

Table2–Maximumpowerlossperpole

RangeofratedcurrentInMaximumpowerlossperpole

AW

32＜In≤406.5

40＜In≤508

50＜In≤6311.5

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63＜In≤10013.5

100＜In≤12518

4.2.16Pollutiondegree

Circuit-breakerstothisstandardareintendedforenvironmentwithpollutiondegree2,i.e.normallyonly

non-conductivepollutionoccurs;occasionally,however,atemporaryconductivitycausedbycondensation

maybeexpected.

5Constructionalrequirements

5.1General

Circuit-breakersshallbesodesignedandconstructedthat,innormaluse,theirperformanceisreliableand

withoutdangertotheuserorsurroundings.Complianceischeckedbycarryingoutalltherelevanttests

specified.

5.2Appearance

Metalpartsofthecircuitbreakershallbeadequatelyplatedandcoatedagainstrusting.Metalpartsshall

nothavecracks,pittingorpeeling.Thesurfaceoftheplasticpartsshallbesmoothwithoutblisters,cracks,

dents,orotherdefects.

Externalpartswhichareaccessiblewhenoperatingthecircuit-breakershallbemadeofinsulating

material.

Dimensionsofcircuit-breakersarespecifiedinAnnexA

5.3Operatingmechanism

Theoperatingmechanismofacircuitbreakershallmeetthefollowingrequirements:

a)Theoperatingpartsmustbeflexibleandreliable,anditshallhaveatrip-freemechanism;

b)Forautomaticcontrolapoweroperatingmechanismshallbeprovided；

c)Themovingcontactscancometorestonlyintheclosedoropenposition,eveniftheoperating

memberistrippedinanintermediateposition

d)Thecircuitbreakershallbeprovidedwithanoperatinghandleformanuallyopeningandclosing,the

operatinghandlemustbesecuredreliably；

e)Goodinsulationbetweenoperatinghandleandlivepartsshouldberealizedtoensuresafety；

f)Themovingcontactsofallpolesofmultipolecircuitbreakersshallbesomechanicallycoupledthat

allpoles,excepttheswitchedneutral,makeandbreaksubstantiallytogether,evenifanoverload

occursononeprotectedpoleonly.

g)Theswitchedneutralpole,ifavailable,shallnotcloseafterandshallnotopenbeforetheprotected

poles；

h)Ifapolehavinganappropriateshortcircuitmakingandbreakingcapacityisusedasaneutralpole,

andthecircuitbreakerisindependentofmanualoperation,allpolesincludetheneutralpolemay

operatesubstantiallytogether；

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i)Exceptinmanualcontrolmode,whenreceivingatripcommand,theacircuitbreakershall

openautomaticallyandthemovingcontactsshallstayintheopenposition,andcouldn’tbeclosed

manually；

j)Abreakerunderclosingcommandshallallowmanuallyopenorclose.Afteropening,itshallstayin

openpositionincaseofapower-offandreenergizing；

Foracircuitbreakersupportingautomaticcontrolmode,theautomaticclosingmoduleshallemployatotally

enclosedconstructionwithinnershaftdriving,torealizeautomaticclosingfunctionandtoensuremoving

contactsstayintheopenpositionwhenmanuallyclosingabreakwhichisinopenstate.

5.4Isolationprotection

Eachpoleofcircuit-breakersshallreliablybreakintheopenposition.Circuit-breakersshallprovidein

theopenpositionanisolationdistanceinaccordancewiththerequirementsnecessarytosatisfytheisolating

function.Indicationoftheopenandclosedpositionofthemaincontactsshallbeprovidedbybothofthe

followingmeans:

a)thepositionoftheactuator;

b)aseparatemechanicalindicator.

5.5(Mechanicalindicatorandactuator)

Indicationoftheopenandclosedpositionofthemaincontactsshallbeprovided.

Itshallbepossibletoswitchthecircuit-breakeronandoffbyhand.Amechanicalindicatorisusedto

indicatethepositionofthecontacts,thisshallshowthesymbol“|”(or“closed”,“ON”,“red”)fortheclosed

positionandthesymbol“○”(or“open”,“OFF”,“green”)fortheopenposition(OFF).

Indicationofthecontactpositionshallbereliable.

Circuit-breakersshallbedesignedsothattheactuator,frontplateorcovercanonlybecorrectlyfittedina

mannerwhichensurescorrectindicationofthecontactposition.

5.6Modeselectionswitch

Forcircuit-breakerswithsemi-automaticandautomaticcontrolmode,amodeswitchshallbeprovidedin

thefronttoselectsemi-automaticcontrolmodeandremoteautomaticcontrolmode.

Modeswitchshallbedesignedonthefrontalsideofthecircuit-breaker,andwiththeidentificationof

“Automatic”and“Manual”forindicatingthemodeatpresent.

Protectionmeasuresshallbetakentopreventthemodeswitchfromtamperinganditshallnotbe

possibletoselectamodewithouttheaidofatool.

5.7Screws,current-carryingpartsandconnections

5.7.1Screwsandconnections

Connections,whetherelectricalormechanical,shallwithstandthemechanicalstressesoccurringin

normaluse.

5.7.2Electricalconnections

Electricalconnectionsshallbesodesignedthatcontactpressureisnottransmittedthroughinsulating

materialotherthanceramic,puremicaorothermaterialwithcharacteristicsnolesssuitable,unlessthereis

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sufficientresilienceinthemetallicpartstocompensateforanypossibleshrinkageoryieldingoftheinsulating

material.

5.7.3Current-carryingpartsandconnections

Current-carryingpartsincludingpartsintendedforprotectiveconductorsshallbemadeof

——copper;

——analloycontainingatleast58%copperforpartsworkedcold,oratleast50%copperforother

parts;

——othermetalorsuitablycoatedmetal,nolessresistanttocorrosionthancopperandhaving

mechanicalpropertiesnolesssuitable.

Note:

Incaseofusingferrousalloysorsuitablycoatedferrousalloys,compliancetoresistancetocorrosionis

checkedbyatestofresistancetorusting.Therequirementsofthissubclausedonotapplytocontacts,

magneticcircuits,heaterelements,bimetals,shunts,partsofelectronicdevicesortoscrews,nuts,washers,

clampingplates,similarpartsofterminalsandpartsofthetestcircuit.

5.8Terminalsforexternalconductors

Terminalsforexternalconductorsshallbesuchthattheconductorsmaybeconnectedsoastoensurethat

thenecessarycontactpressureismaintainedpermanently.Connectionarrangementsintendedforbusbar

connectionareadmissible,providedtheyarenotusedfortheconnectionofcables.Sucharrangementsmaybe

ofthebolt-ontype.Theterminalsshallbereadilyaccessibleundertheintendedconditionsofuse.

Circuit-breakersshallbeprovidedwithterminalswhichshallallowtheconnectionofcopperconductors

havingnominalcross-sectionalareasasshowninTable3.

Table3Connectablecross-sectionsofcopperconductorsforscrew-typeterminals

RatedcurrentInCross-sectionalareaofthewireS

Amm2

32＜In≤5010

50＜In≤6316

63＜In≤8025

80＜In≤10035

100＜In≤12550

Foracurrentratingnotspecified,ifrequired,complianceischeckedbyrelevantnationalstandards.

Itisrequiredthat,forcurrentratingsuptoandincluding50A,terminalsbedesignedtoclampsolidconductorsandrigid

strandedconductors,flexibleconductorsmayalsobeused.

Themeansforclampingtheconductorsintheterminalsshallnotservetofixanyothercomponent.

Terminalsshallhaveadequatemechanicalstrength.Screwsandnutsforclampingtheconductorsshall

haveametricISOthreadorathreadcomparableinpitchandmechanicalstrength.

Terminalsshallbesodesignedthattheyclamptheconductorwithoutunduedamagetotheconductor.

Terminalsshallbesodesignedthattheyclamptheconductorreliablyandbetweenmetalsurfaces.

Terminalsshallbesodesignedorpositionedthatneitherarigidsolidconductornorawireofastranded

conductorcanslipoutwhiletheclampingscrewsornutsaretightened.

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Terminalsshallbesofixedorlocatedthat,whentheclampingscrewsornutsaretightenedorloosened,

theterminalsshallnotworkloosefromtheirfixingstocircuit-breakers.

Clampingscrewsornutsofterminalsintendedfortheconnectionofprotectiveconductorsshallbe

adequatelysecuredagainstaccidentalloosening.

Pillarterminalsshallallowfullinsertionandreliableclampingoftheconductor.

Complianceischeckedbyinspectionafterarigidconductorofthelargestcross-sectionalareaspecified

fortherelevantratedcurrentinTable3hasbeenfullyinsertedandfullyclampedbyapplyingthetorques

accordingtoTable4.

Table4–Screwthreaddiameterandappliedtorque

ScrewthreaddiameterTorque

mmNm

ⅠⅡⅢ

≤2.80.20.40.4

＞2.8～≤3.00.250.50.5

＞3.0～≤3.20.30.60.6

＞3.2～≤3.60.40.80.8

＞3.6～≤4.10.71.21.2

＞4.1～≤4.70.81.81.8

＞4.7～≤5.30.82.02.0

＞5.3～≤6.01.22.53.0

＞6.0～≤8.02.53.56.0

＞8.0～≤10.0—4.010.0

＞10.0～≤12.0——14.0

＞12.0～≤15.0——19.0

＞15.0～≤20.0——25.0

＞20.0～≤24.0——36.0

＞24.0——50.0

Note1.ColumnIappliestoscrewswithoutheadsifthescrew,whentightened,doesnotprotrudefromthehole,andto

otherscrewswhichcannotbetightenedbymeansofascrewdriverwithabladewiderthanthediameterofthescrew.

Note2.ColumnIIappliestootherscrewswhicharetightenedbymeansofascrewdriver.

Note3.ColumnIIIappliestoscrewsandnutswhicharetightenedbymeansotherthanascrewdriver.

Screwsandnutsofterminalsintendedfortheconnectionofexternalconductorsshallbeinengagement

withametalthreadandthescrewsshallnotbeofthetappingscrewtype.

5.9Signalfeedbackmode

ThecontrolsignalisanAC220Vsignal.Thecontrolunitispoweredbythecontrollineorbythephase

linetransientlyduringtheopeningandclosingoperations.Theleakagecurrentofphaseaftertheclosingor

openingoperationshallcomplywiththerequirementsof4.2.13and4.2.14respectively.

ThefeedbacksignalisanAC220Vsignal.Thefeedbacksignalispoweredbythephaselinefor

single-phasecircuit-breakers.Forthree-phasecircuit-breakersthefeedbacksignalispoweredbythreephases

andshallensureproperfeedbackevenunderanyonephaseloss..

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Thecontrolwireandthefeedbacksignalwireshallhaveacross-sectionalareanolessthan0.3?mm2,with

crimpedlugsatbothendstopreventinverseconnection.Specificationsmaybeinaccordancewiththe

manufacturer'sinstructions.

5.10Protectionagainstelectricshock

Circuit-breakersshallbesodesignedthat,whentheyaremountedandwiredasfornormaluse,liveparts

arenotaccessible.Externalparts,otherthanscrewsorothermeansforfixingcoversandlabels,shalleitherbe

ofinsulatingmaterialorbelinedthroughoutwithinsulatingmaterial,unlessthelivepartsarewithinan

internalenclosureofinsulatingmaterial.

Liningsshallbefixedinsuchawaythattheyarenotlikelytobelostduringinstallationofthe

circuit-breakers.Theyshallhaveadequatethicknessandmechanicalstrengthandshallprovideadequate

protectionatplaceswheresharpedgesoccur.

Inletopeningsforcablesorconduitsshalleitherbeofinsulatingmaterialorbeprovidedwithbushingsor

similardevicesofinsulatingmaterial.Suchdevicesshallbereliablyfixedandshallhaveadequatemechanical

strength.

Metallicoperatingmeansshallbeinsulatedfromlivepartsandtheirexposedconductivepartsshallbe

coveredbyinsulatingmaterial.Thisrequirementdoesnotapplytomeansforcouplinginsulatedoperating

meansofseveralpoles.Metalpartsofthemechanismshallnotbeaccessible.

6TechnicalRequirements

6.1Basicrequirements

6.1.1Ambientairtemperaturerange

TheambientairtemperatureshallcomplywiththosespecifiedinTable5.

Table5Ambientairtemperaturerange

No.ConditionTemperaturerange(℃)

1Specifiedoperatingtemperature-25～65

2Limittemperature-40～70

6.1.2Humidityrange

TherelativehumidityoftheairshallcomplywiththosespecifiedinTable6.

Table6RelativeAirHumidity

No.ConditionRelativehumidity

1Annualaverage＜75％

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30days(thesedaysaredistributedinanaturalway

295％

throughouttheyear)

3Occasionallyoccuronotherdays85％

6.1.3Atmosphericconditions

63.0?kPa～106.0?kPa（海拔2000?m及以下），特殊訂貨要求除外。高海拔地區(qū)的要求應(yīng)按照標(biāo)準(zhǔn)

GB/T20645—2006中7.2.2的要求進行修正。

63.0kPa~106.0kPa(thealtitudedoesnotexceed2000?m),exceptforspecialorderrequirements.The

requirementsathigheraltitudesshallbemodifiedinaccordancewiththerequirementsof7.2.2of

GB/T20645-2006.

6.1.4In