ICS29.200

M41

YD

CommunicationsIndustryStandardofthePeople’

sRepublicofChina

YD/T731-2018

ReplaceYD/T731-2008

48VRectifierforTelecommunications

通信用48V整流器

(Englishtranslation)

Issuedate:2018-04-30Implementationdate:

2018-07-01

IssuedbytheMinistryofIndustryandInformationTechnologyofthePeople’sRepublicofChina

YD/T731-2018

Foreword

ChinaCommunicationsStandardsAssociation(CCSA)isinchargeofthisEnglish

translation.IncaseofanydoubtaboutthecontentsofEnglishtranslation,theChinese

originalshallbeconsideredauthoritative.

ThisstandardisdraftedinaccordancewiththerulesgiveninGB/T1.1-2009.

ThisstandardreplacesYD/T731-2008High-frequencySwitch-modeRectifierfor

Telecommunicationsinwhole.

ThefollowingtechnicaldeviationshavebeenmadewithrespecttotheYD/T731-2008:

a)Thestandardtitlehasbeenmodifiedto48VRectifierforTelecommunications;

b)TheDCoutputcurrentratingserieshavebeenmodified(see3.2,3.1inYD/T731-2008)

c)Therequirementsforwaveformdeviationofinputvoltagearedeleted,andthe

requirementthatTheinputvoltagewaveformdistortionshallnotbegreaterthan5%isadded

inthetestenvironmentalconditions(see5.1.1,4.2.5of2008Edition);

d)Thedefinitionofratedpowerisadded(see3.3);

e)Therequirementsforinputpowerfactoraremodified(see4.4,4.5of2008Edition);

f)Therequirementsforharmoniccomponentsofinputcurrentaremodified(see4.5,

4.6of2008Edition)

g)Therequirementsforrectifierefficiencyaremodified(see4.6,4.7of2008

Edition);

h)Therequirementsfordiscretefrequencynoisevoltagearedeleted(see4.8.3of2008

Edition);

i)Therequirementsforprotectionfunctionoffuse(orcircuitbreaker)aredeleted

(see4.23of2008Edition);

j)Therequirementsfordielectricstrengtharemodified(see4.24.2,4.26.2of2008

Edition)

k)Therequirementsforsoftstartaremodified(see4.15,4.16of2008Edition).

Attentionisdrawntothepossibilitythatsomeoftheelementsofthisstandardmay

bethesubjectofpatentrights.Theissuingbodyofthisdocumentshallnotbeheld

responsibleforidentifyinganyorallsuchpatentrights.

ThisstandardwasproposedandpreparedbyCCSA.

Thisstandardwasissuedin1994asfirstedition,wasfirstrevisedinFebruary2002

andthesecondrevisionwasissuedinJuly2008.Thisisthethirdrevisededition.

II

YD/T731-2018

1Scope

Thisstandardspecifiestheseries,requirements,testmethods,inspectionrules,sign,

packaging,transportandstorageof48Vrectifierfortelecommunications(hereinafter

referredtoastherectifier).

Thisstandardisapplicableto48Vrectifiersfortelecommunications,andmayalsobe

usedfor24Vrectifiers.

2NormativeReferences

Thefollowingreferenceddocumentsareindispensablefortheapplicationofthis

document.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,

thelatesteditionofthereferenceddocument(includinganyamendments)applies.

GB/T191Packaging-PictorialMarkingforHandlingofGoods

GB/T2423.1-2008EnvironmentalTestingforElectricandElectronicProducts-Part

2:TestMethods-TestA:Cold

GB/T2423.2-2008EnvironmentalTestingforElectricandElectronicProducts-Part

2:TestMethods–TestB:DryHeat

GB/T2423.3-2006EnvironmentalTestingforElectricandElectronicProducts-Part

2:TestMethods–TestCab:DampHeat,SteadyState

GB/T2423.5-1995EnvironmentalTestingforElectricandElectronicProducts-Part

2:TestMethods–TestEaandGuidance:Shock

GB/T2423.10-2008EnvironmentalTestingforElectricandElectronicProducts-Part

2:TestMethods–TestFc:Vibration(Sinusoidal)

GB/T2828.1-2012SamplingProceduresforInspectionbyAttributesPart1:Sampling

SchemesIndexedbyAcceptanceQualityLimit(AOL)forLot-by-lot

Inspection

GB/T2829-2002SamplingProceduresandTablesforPeriodicInspectionby

Attributes(ApplicabletoInspectionofProcessStability)

GB/T3859.2SemiconductorConverters-GeneralRequirementsandLine

CommutedConvertersPart1-2:ApplicationGuide

GB/T3873GeneralSpecificationsforProductsPackagingofCommunication

Equipment

GB4943.1-2011InformationTechnologyEquipment-Safety-Part1:General

Requirements

GB/T4980-2003DeterminationofSoundLevelforNoiseEmittedbyDisplacement

Compressors

GB/T18380.1-2001TestonElectricCablesunderFireConditions-Part1:Teston

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YD/T731-2018

aSingleVerticalInsulatedWireorCable

YD/T122-1997NameplatesofProductsforPostandTelecommunicationsIndustry

YD/T282-2000GeneralReliabilityTestMethodforofCommunicationEquipment

YD/T944-2007TechnicalSpecificationandTestingMethodsforSurgeProtection

ofPowerSupplyforCommunications

YD/T983-2013LimitsandMethodsofMeasurementofElectromagnetic

CompatibilityofTelecommunicationPowerSupplyEquipment

3ProductSeries

3.1NominalvalueseriesofDCoutputvoltage

ThenominalvalueofDCoutputvoltageoftherectifieris48V.

Note:Productsotherthannominalvaluemaybeproducedaftertherequestoftheuser

andnegotiationwiththemanufacturer.

3.2RatedvalueseriesofDCoutputcurrent

TheratedvalueseriesofDCoutputcurrentoftherectifiermaybe10A,15A,30A,50A,

and100A.

Note:Productsotherthanratedvalueseriesmaybeproducedaftertherequestoftheuserand

negotiationwiththemanufacturer.

3.3Ratedpowerseries

Theoutputvoltageoftherectifieris57.6V.Theoutputpoweratratedcurrentisthe

ratedpoweroftherectifier.

4Requirements

4.1Environmentalconditions

4.1.1Temperaturerange

Operatingtemperaturerange:-5℃~+45℃.

Note:Theuppertemperaturelimitofspecialapplicationenvironmentis55℃.

Storageandtransporttemperaturerange:-40℃~+70℃.

4.1.2Relativehumidityrange

Operatingrelativehumidityrange:≤90%(40℃±2℃).

Storageandtransportrelativehumidityrange:≤95%(40℃±2℃).

4.1.3Atmosphericpressure

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YD/T731-2018

Thealtitudeshallnotexceed1000m.Otherwise,thecapacityshallbereducedas

specifiedinGB/T3859.2.

4.1.4Impactandvibration

Therectifiershallbeabletowithstandtheimpactwithpeakaccelerationof150m/s2

anddurationof11ms.

Therectifiershallbeabletowithstandsinewavevibrationwithfrequencyof10Hz~55Hz

andamplitudeof0.35mm.

4.2ACinput

4.2.1Ratedvoltage

Singlephase:220V.

Threephases:380V.

4.2.2Ratedfrequency

Theratedfrequencyis50Hz.

4.2.3Voltagefluctuationrange

Whentherectifieroutputis100%ratedload,theACinputvoltageshallmeetthe

requirementsof85%~110%.

Note:WhentheACinputvoltageexceedstheaboverange,therectifiercanbederated.

4.2.4Frequencyfluctuationrange

Thefluctuationrangeofinputfrequencyis47.5Hz~52.5Hz.

4.3DCoutput

TheadjustablerangeofDCoutputvoltageis43.2V~57.6V.

TheDCoutputvoltagevalueofrectifiercanberegulatedmanuallyorunderthecontrol

ofmonitoringcircuit(systemmonitoringunit)continuouslywithintheadjustablerange.

TherectifiershalloutputratedcurrentwithintheadjustablerangeofDCoutput

voltage.

4.4Inputpowerfactor

TheinputpowerfactorofrectifiershallmeettherequirementsgiveninTable1.

Table1InputPowerFactor

ClassificationClassIClassIIClassIII

Inputpowerfactor(100%load)≥0.99≥0.96≥0.94

Inputpowerfactor(50%load)≥0.98≥0.95≥0.92

Inputpowerfactor(30%load)≥0.97≥0.94≥0.90

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4.5Totalharmoniccomponentofinputcurrent

Thetotalharmoniccomponentofinputcurrentofrectifiershallmeettherequirements

giveninTable2.

Table2TotalHarmonicComponentofInputCurrent(THDAfor3timesto39times)

ClassificationClassIClassIIClassIII

Totalharmoniccomponentofinputcurrent(100%≤5%≤10%≤25%

load)

Totalharmoniccomponentofinputcurrent(50%≤8%≤15%≤28%

load)

Totalharmoniccomponentofinputcurrent(30%≤12%≤20%≤30%

load)

Note:THDAistotalharmonicdistortionofcurrent

4.6Efficiency

TheefficiencyofrectifiershallmeettherequirementsgiveninTable3.

Table3Efficiency

Outputcurrent≥30A<30A

ClassificationClassIClassIIClassClassIClassIIClass

IIIIII

Efficiency(100%load)≥95%≥92%≥89%≥91%≥88%≥86%

Efficiency(50%load)≥96%≥92%≥89%≥92%≥88%≥86%

Efficiency(30%load)≥93%≥86%≥83%≥89%≥85%≥81%

4.7Noisevoltage

4.7.1Phonebalanceweightednoisevoltage

ThephonebalanceweightednoisevoltageattheDCoutputendoftherectifiershall

benotgreaterthan2mV.

4.7.2Broadbandnoisevoltage

ThebroadbandnoisevoltageattheDCoutputendofrectifierwithinthefrequencyband

of3.4kHz~150kHzshallbenotgreaterthan50mV.

ThebroadbandnoisevoltageattheDCoutputendofrectifierwithinthefrequencyband

of0.15MHz~30MHzshallbenotgreaterthan20mV.

4.7.3Peak-to-peakvaluenoisevoltage

Thepeak-to-peaknoisevoltageattheDCoutputendofrectifierwithinthefrequency

bandof0MHz~20MHzshallbenotgreaterthan200mV.

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4.8Loadeffect(loadregulation)

ThedifferencebetweentheDCoutputvoltageandtheoutputvoltagesettingvalueunder

differentloadconditionsshallnotexceed±0.5%oftheoutputvoltagesettingvalue.

4.9Sourceeffect(powergridregulation)

ThedifferencebetweentheDCoutputvoltageandtheoutputvoltagesettingvalueunder

differentACinputvoltagesshallnotexceed±0.1%oftheoutputvoltagesettingvalue.

4.10Stabilizedvoltageprecision

DifferentACinputvoltagesandloadsshallbecombined.Thedifferencebetweenthe

DCoutputvoltageandtheoutputvoltagesettingvalueundervariousconditionsshallnot

exceed±0.6%oftheoutputvoltagesettingvalue.

4.11Temperaturecoefficient(1/℃)

Relativeto20℃ambienttemperature,thedifferencebetweentheDCoutputvoltageand

theoutputvoltagesettingvalueshallnotexceed±0.02%oftheoutputvoltagesetting

valueeverytimethetemperaturechangesby1℃.

4.12Loadeffectrecoverytime(dynamicresponse)

TherecoverytimeafterthechangeofDCoutputvoltagecausedbythestepchange(sudden

change)oftheloadshallnotbegreaterthan200μs,anditsovershootshallnotexceed

±5%ofthesettingvalueofoutputvoltage.

Note:Therecoverytimereferstotheperiodoftimefromthetimewhenthechangeof

DCoutputvoltagerisestobegreaterthanthestabilizedvoltageprecision,tothetime

whenitrecoverstobelessthanorequaltoandnolongerexceedsthestabilizedvoltage

precision.

4.13Startup&shutdownovershootamplitude

ThemaximumpeakvalueofDCoutputvoltagechangecausedbystartup&shutdownshall

notexceed±5%ofthesettingvalueofDCoutputvoltage.

4.14Inrushstartingcurrent(surgecurrent)

Theinputimpulsecurrentcausedbystartingshallnotbegreaterthan150%ofthe

maximumsteady-stateinputcurrentpeakvalueundertheratedinputvoltage.

4.15Softstart

4.15.1Softstarttime

Thesoftstarttimeofrectifiershallbe3s~10s.

4.15.2Delaystarttimesettingfunction

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YD/T731-2018

Therectifiershallhavethefunctionofsettingthedelaystarttime,whichcanbe

setremotelythroughthesystemmonitoringunitorthesystem.

4.16Acousticnoise

Theacousticnoiseshallnotbegreaterthan55dB(A-weighted).

4.17Telemetering,remotesignalingandremotecontrolfunctions

Therectifiershallhaveinterfacecircuit,whichcanbeconnectedwiththemonitoring

circuit(systemmonitoringunit),andshallhavethefollowingfunctionsunderthecontrol

ofthemonitoringcircuit(systemmonitoringunit):

-Telemetering:Rectifieroutputvoltageandrectifieroutputcurrent;

-Remotesignaling:Rectifierworkingstate(on/off,equalized/floatingcharging/test,

currentlimiting/non-currentlimiting,fault/normal)

-Remotecontrol:On/off,equalized/floatingcharging/test.

4.18DCoutputcurrentlimitingoroutputpowerlimitingperformance

TherectifiershallhaveDCoutputcurrentlimitingperformance.TheDCoutputcurrent

limitingprotectionfunctionoftherectifiercontainstwoforms:

-ThecurrentlimitvalueofDCoutputcurrentoftherectifiercanbebetween105%~110%

ofitsnominalvalue.Whentheoutputcurrentreachesthecurrentlimitvalue,therectifier

willoutputthecurrentlimitvalue;

-Forconstant-powerrectifier,whentheDCoutputpowerofrectifierreachesthe

constantpowervalue,therectifiershalloutputinpowerlimitingmode.Therectifiershall

alsohaveautomaticshort-circuitprotectionperformance.Afterthefaultiseliminated,

therectifiershallreturntoworkautomatically.

4.19Loadsharing(paralleloperation)performance

Therectifiershallbeabletoadoptmultiplerectifiersofthesamemodelforparallel

operation.Whentherectifierworksindependentlyoriscontrolledbythesystemmonitoring

unitduringparalleloperation,theloadshallbeshared.Theunbalancedvalueoftheshared

loadwithintherangeof50%~100%oftheratedoutputcurrentofthesinglemachineshall

notexceed±5%oftheratedvalueoftheDCoutputcurrent.

4.20ACinputovervoltage,undervoltageandopen-phaseprotectionfunction

Therectifiershallbeabletomonitorthechangeofgridvoltage.WhentheACinput

voltageistoohighortoolow,therectifiershallhavethefollowingprotectionfunctions:

-Whenthegridvoltageistoohigh,therectifiershallhavethefunctionofovervoltage

shutdownprotectionandgiveanalarm.Afterthegridvoltagereturnstonormal,itcan

automaticallyreturntowork.Thesettingofovervoltageprotectionvoltageshallnotbe

lowerthan115%oftheratedvoltage(thesingle-phasevoltageshallbenotlessthan253V,

andthree-phasevoltageshallbenotlessthan437V);

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YD/T731-2018

-Whenthegridvoltageistoolow,therectifiershallhavethefunctionofundervoltage

protectionandgiveanalarm.Afterthegridvoltagereturnstonormal,itcanautomatically

returntowork.Thesettingofundervoltageprotectionvoltageshallnotbehigherthan

80%oftheratedvoltage(thesingle-phasevoltageshallbenotgreaterthan176V,and

three-phasevoltageshallbenotgreaterthan304V);

-Forthree-phaseinputrectifier,incaseofinputphaseloss,therectifiershallhave

openphaseprotectionfunctionandgiveanalarm.Afterthepowergridreturnstonormal,

itcanautomaticallyresumeoperation.

4.21Over-temperatureprotectionfunction

Whentheinternaltemperatureofrectifierreachestheprotectionsettingvalue,it

canautomaticallygiveanalarmandprotection.Afterthefaultiseliminated,therectifier

shallreturntoworkautomatically.

4.22Lightningprotectionperformance

TheACinputterminalofrectifiershallbeequippedwithsurgeprotectivedevice,which

shallcomplywiththerequirementsgiveninYD/T944.

4.23Groundingperformance

Theresistancebetweenallaccessiblemetalshellsandmetalpartsandtheprotective

earth(PE)terminalofrectifiershallnotbegreaterthan0.1Ω.

4.24Safetyrequirements

4.24.1Insulationresistance

WhenthetestvoltageisDC500V,theinsulationresistanceoftheACpartandDCpart

ofthemaincircuitofrectifiertothegroundandtheACparttotheDCpartshallnot

belessthan2MΩ.

4.24.2Dielectricstrength

TheACcircuittogroundcanwithstand50HzACvoltagewitheffectivevalueof1500V

(leakagecurrent≤30mA)or2120VDCvoltageequivalenttoitspeakvaluefor1minwithout

breakdownandflashover.

TheACcircuittoDCcircuitcanwithstand50HzACvoltagewitheffectivevalueof3000V

(leakagecurrent≤30mA)or4240VDCvoltageequivalenttoitspeakvaluefor1minwithout

breakdownandflashover.

TheDCcircuittogroundcanwithstand50HzACvoltagewitheffectivevalueof500V

(leakagecurrent≤30mA)or710VDCvoltageequivalenttoitspeakvaluefor1minwithout

breakdownandflashover.

4.24.3Touchcurrentandprotectiveconductorcurrent

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YD/T731-2018

Thetouchcurrentbetweentheprotectiveearth(PE)ofrectifierandtheinputneutral

line(N)shallnotbegreaterthan3.5mA.

Note:Whenthetouchcurrentisgreaterthan3.5mA,theeffectivevalueoftheprotective

conductorcurrentshallnotexceed5%oftheinputcurrentofeachphase.Iftheloadis

unbalanced,themaximumvalueamongthreephasecurrentsshallbeusedforcalculation.

Thecrosssectionalareaoftheprotectiveconductoronthehigh-currentpathofthe

protectiveconductorshallnotbelessthan1.0mm2.Attheprimarypowerconnectionend

closetotherectifier,asignboardindicatingwarningwordsorsimilarwordsshallbe

arranged,thatis,“Hightouchcurrentmustbegroundedbeforeturningonthepowersupply”.

4.24.4Flame-retardantperformanceofmaterials

Theflame-retardantratingofPCBusedfortherectifiershallmeettheV-0requirements

asspecifiedinGB4943.1-2011.Theflame-retardantratingofplasticconductorshallmeet

therequirementsasspecifiedinGB/T18380.1-2001.Theflame-retardantratingofother

insulatingmaterialsshallmeettheV-1requirementsasspecifiedinGB4943.1-2011.

4.25Electromagneticcompatibility

4.25.1Conducteddisturbancelimit

TheconducteddisturbancelimitofrectifiershallcomplywiththerequirementsofClass

AgiveninTable1ofYD/T983-2013.Theconducteddisturbanceshallbemeasuredatthe

inputandoutputportsofthepowersupply.

Note:Theoutputportrefersto48Vforcommunication.

4.25.2Radiationdisturbancelimit

TheradiationdisturbancelimitofrectifiershallcomplywiththerequirementsofLevel

AinTable1ofYD/T983-2013.

4.25.3Harmoniccurrentlimit

Theharmoniccurrentlimitofrectifiershallcomplywiththelimitrequirementsof

Class-AequipmentgiveninTable1ofYD/T983-2013.

4.25.4Voltagefluctuationandflickerlimit

Thevoltagefluctuationandflickerlimitofrectifiershallcomplytherequirements

giveninTable1inYD/T983-2013.

4.25.5Immunity

4.25.5.1Electrostaticdischargeimmunity

Inthetelecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable3inYD/T983-2013duringorafterthetest.

Innon-telecommunicationcenterenvironment,therectifiershallmeettherequirements

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YD/T731-2018

giveninTable8inYD/T983-2013duringorafterthetest.

4.25.5.2Radiatedelectromagneticfieldimmunity

Inthetelecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable3inYD/T983-2013duringorafterthetest.

Innon-telecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable8inYD/T983-2013duringorafterthetest.

4.25.5.3Electricalfasttransientburstimmunity

Inthetelecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable4,Table5,Table6andTable7inYD/T983-2013duringorafterthetest.

Innon-telecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable9,Table10,Table11andTable12inYD/T983-2013duringorafterthetest.

4.25.5.4Surge(impact)immunity

Inthetelecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable4,Table5andTable6inYD/T983-2013duringorafterthetest.

Innon-telecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable9,Table10andTable11inYD/T983-2013duringorafterthetest.

4.25.5.5Immunitytoconducteddisturbanceinducedbyradiofrequencyfield

Inthetelecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable4,Table5,Table6andTable7inYD/T983-2013duringorafterthetest

Innon-telecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable9,Table10,Table11andTable12inYD/T983-2013duringorafterthetest.

4.25.5.6Voltagesagandvoltageshort-timeinterruptionimmunity

Inthetelecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable6inYD/T983-2013duringorafterthetest.

Innon-telecommunicationcenterenvironment,therectifiershallmeettherequirements

giveninTable11inYD/T983-2013duringorafterthetest.

4.26Reliabilityindex

Meantimebetweenfailures(MTBF)is≥1×105h.

5TestMethods

5.1Preparationbeforetest

5.1.1Testenvironmentalconditions

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YD/T731-2018

Beforepower-on,therectifierundertestshallbebalancedwiththeambienttemperature,

andpreheatedaccordingtothespecifiedpreheatingtimeoftheproduct.Theinputvoltage

waveformdistortionshallnotbegreaterthan5%.

Unlessotherwisespecified,thetestshallbeconductedunderstandardatmospheric

conditions.Thestandardatmosphericconditionsare:

-Ambienttemperature:15℃~35℃;

-Relativehumidity:45%~75%;

-Atmosphericpressure:86kPa~106kPa.

5.1.2Testinstrumentsandequipment

SeeAnnexA.

5.2ACinputtest

5.2.1Basicprincipleoftest

ThebasicprincipleofthetestisshowninFigure1.

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