基于故障分量的方向电流差动保护

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1、ABSTRACTCurrentdifferentialprotectionisanmainimportantprincipleoftransmissionlineprotection，whichhasalotofadvantagescomparedwithotherprotectionprinciple．Alongwiththedevelopmentmicrocomputerandwiththeprogressoffibercommunicationtechnique，researchoncurrentdifferentialprotectioncrit

2、erionsisbecomingmoreandmoreimportantthanbefore．Thispaperconcernsonthisdirection．TosolvetheproblemthatfuUcurrentdifferentialprotectiondoesn’thasenoughsensitivitywhengroundingwithbigtransitionresistance，thispaperproposesanewdirectionalcurrentdifferentialprotectioncriterion．Compares

3、withothercriterions，thisonehasgreatsensitivitytoinnerfaultandgreatrestrainingabilityforexternalfaultandcanendurelargefaultresistance．Inthiscriterionallincrementalcomponentdirectionalcurrentdifferentialprotectionisusedasmainprotectionoftransmissionlineandanincrementalcomponentdist

4、anceprotectionwhichhasabilitytoendurefaultresistanceandhasacleardirectionisproposedtobebackupprotection．Mainprotectionandbackupprotectionusecurrentfaultcomponentsinthetwocirclesfollowingthehappeningfaultandchangetofhllcurrentdifferentialprotectionafterthetwocircles．Bydoingthisthe

5、criterioncanensurehighoperationreliability．Becausemainprotectionandbackupprotectionissimilarinprinciple，thecriterioncanberealizedeasily．Inthispaperthedigitalsimulationoftheproposedprinciplehavebeendoneonthe220kVand500kVtransmissionlinemodelandthencomparisonoftheperformanceoffault

6、componentratio—restrainingdifferentialprotectionwasmade．andzerosequencedirectionalcurrentdifferentialprotection．Theresultsofsimulationprovedthatthiscriterionhasremarkableimprovementintolerancetransitionimpedanceandgreatrestrainingabilitywhenshortcircuitoutsidethetransmissionline．

7、Finallythispaperintroducesthehardwareandsoftwaredesignofdataacquisition&communicationboardwhichiSamainpartofmicroDrocessorbaseddifferentialprotectiondevice．Thefunctionsofthismoduleincludedataacquisition，samplesynchronization，dataexchangingandcommunication．Serialcommunicationcontr

8、ollerZ85230iSusedtoreceiveandtransmitdat