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1、RESEARCHANDAPPLICATIONOFPROTECTIONTECHNOLOGY摘要：Abstract:ResearchandapplicationprogressofNARI-RELAYSinprotectionbasedonDPFCwerereviewed,keytechnologyemployedinline,busbar,transformerandgeneratorprotectionwerepresented.Itwaspointedoutthatintegrationofmainandbacku
2、pprotectioninonedeviceandduplicateallocationwasreasonableandbeneficial.Keywords:Protection;DPFC;Mainprotection;Backupprotection;Duplicateprotection关键词：Research 0.IntroductionElectricpowernetworkinChinahasstepintoanewstagewithlarge-scalenetworks,superpowerplants
3、andhigh-ratinggenerators.Bytheendofyear2002,totalinstalledgenerationcapacityis353000MW,totallengthof35kVandabovetransmissionlinesis806500kM,totalinstalledtransformercapacityis1194000MVA,andgeneratedenergyoftheyearis164×1010kW·h。Asanimportantpartofelectricpowers
4、ystem,protectionisthetechnologymeasurestoensurethesecurityandstabilityofpowernetworks.Developmentofelectricpowersystemrequiresnewfunctionsandhigherperformanceofprotection.Newprogressinmicroelectronics,computerandcommunicationtechnologymakesitpossibletoimprovepr
5、otectionfurthermore.NARI-RELAYSElectricsCo.,Ltd.isthemainbaseofresearchonprotectionprincipleandtechnology,andamongtheleadingsuppliersofprotectionandautomationproductsinChina.Shehasmadegreatprogressinresearchandapplicationofnewprotectiontechnology,especiallyseri
6、esprotectionbasedonDeviationofPowerFrequencyComponent(DPFC).Shealsopossessesmanyinventionpatents.Theauthorsummarizedtheseresearchandapplicationprogress,presentedhisownviewpointonprotectionallocation,andlookforwardtodiscussthisissuewithexpertsinprotectionarea. 1
7、. ApplicationofDPFCprotectionDPFCprotectionisakindoffaultcomponentsprotection.Faultcomponentshavetwocharacteristics:(1)Faultcomponentsonlyappearduringfaultanddisappearundernormalcondition;(2)Allfaultcomponentsareproducedbythesameelectromotiveforceatthefaultpoin
8、t,sothatfaultcomponentsatfaultpointarelargerthanelsewhere.NormalloadcurrentdoesnotinfluenceprotectionbasedonDPFCprincipleatall.FaulttransientresistanceslightlyaffectsDPFCpro
