综合输电线路差动保护继电器Word文档下载推荐.docx

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theprotectionofeverylinesectionsconnectedtothesubstation

busbar.Thecurrentdifferentialalgorithmswithmultiplesettings

areimplementedintotherelaytocoveralltheprotectedline

sections.Theschemeissupportedbyadvancedcommunication

networkandstandard.Studiesshowthatthenewschemenotonly

offersthenewprotectionfeaturesforindividualpowerline,but

alsoprovidesthecharacteristicsofintegratedprotection.Studies

alsoshowthatthenewrelayoffersmoreprotectionfunctionsand

significanteconomicadvantagesovertheconventionalcurrent

differentialrelays.

IndexTerms--CentralizedProtection,CurrentDifferential

Protection,IntegratedProtection.

I.INTRODUCTION

URRENTdifferentialprotectionhasbeenplayingamajor

roleinpowertransmissionlineprotection[1].In

particularwiththedevelopmentofopticalcommunication

technology,thecurrentdifferentialrelayhasbecomethemain

protectiondevicefortransmissionlinesatandaboveEHV

level.Inrecentyears,therehasalsothefastdevelopmentin

bothmicroprocessorandtransducertechnologies.Thishas

enabledprotectiontechniquestobeconsideredwhichwere

impracticalinthepast.Studieshavefoundthatthefault

generatedhighfrequencytransientscanbedetectedand

quantifiedandopenthepossibilityfordevelopingnew

protectionprinciplesandtechniques.Considerableefforthas

nowbeendevotedtoresearchonhighfrequencytransient

detection[2].Anumberofnewtechniqueshavebeen

proposedandtheirassociatedmeasurementandsignal

processingtechniquesinvestigated.Atthesametime,the

dramaticgrowthinsignalprocessingpowerofrelayplatforms,

andtheavailabilityofsuitablecommunicationsschemes,has

ZQBoandAKlimekarewiththeAREVAT&

D–Automation,UK.（e-

mail:

zhiqian.bo@areva-）.

YLRenandJHHearewiththeDepartmentofElectricalEngineering,

BeijingJiaotongUniversity,China.

978-1-4244-1762-9/08/$25.00?

2008IEEE

providedanewopportunitytoimprovetheexistingand

developnewprotectiontechniquesbasedonpowerfrequency

measurements.Researchshowsthatinformationobtainedfrom

multiplepowerplantsandcomponentscanbeusedtoderive

newprotectionprinciplesandschemes[3-14],whichcould

havesignificantadvantagesovertheexistingprotection

techniquesbasedonindividualplantorcomponent.Inthis

respect,ithasbeenfoundthatthenewtransientbased

protectiontechniquesnotonlyinheritthecapabilitytoprotect

individualplant,butcanalsobeusedtoproducenovel

schemesfortheintegratedprotectionofapowernetworkwhen

supportedbymoderncommunicationtechnology.Recently,a

novelintegratedprotectionschemebasedonfaulttransient

detectionisproposed[15].Inthescheme,acentralized

protectionrelayisinstalledatasubstationandinterfacedto

everyline,throughtheCTs.Thefaultgeneratedtransient

signalsarecapturedbytherelay,thepolaritiesandlevelsof

thesignalsarethencompared,fromwhichthedirectionofthe

faultcanbederived.Thedirectionaldecisionisthen

forwardedtorelevantsubstationrelaysandtheintegrated

networkprotectionandautomationunit,thefaultedline

sectioncanbeisolatedbylocalprotectionornetwork

protection.

Thispaperpresentsacompletedintegratedprotection

scheme.Inthescheme,anintegratedcurrentdifferentialrelay,

interfacedtotheCTsonalloftheoutputlinesconnectedtothe

substationbusbarandconnectedtoneighboringsubstationsat

theremoteendsofthelines,isresponsiblefortheprotectionof

allthetransmissionlinesassociatedwiththesubstation.The

currentdifferentialalgorithmwithmultiplesettingstocoverall

theprotectedlinesectionsisusedasthemainprotection

techniqueandthedesignofthenewintegratedcurrent

differentialrelayisalsodescribedinthispaper.Studiesshow

thatthenewschemeisnotonlyusefriendlybutalsoeconomic,

atthesametimeprovidethefeaturesofintegratedprotection,

whichcouldrepresentthedirectionoffuturedevelopmentin

powersystemprotection.

II.CONCEPTOFINTEGRATEDPROTECTION

Withthedevelopmentofdigitaltechnology,moreandmore

protectionfunctionsforanapparatus（line,transformer,

generatoretc.）havebeenimplementedwithinoneprotective

devicetoachieveacertaindegreeofintegration.Forexample,

anumericlineprotectionrelaymayha