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《基于暫態(tài)電氣量超高壓輸電線(xiàn)路高阻接地保護(hù)算法的研究》由會(huì)員上傳分享，免費(fèi)在線(xiàn)閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、包算法提取故障生成的高頻暫態(tài)信號(hào)。通過(guò)對(duì)不同故障情況下，對(duì)一定時(shí)間內(nèi)，兩個(gè)不同頻帶內(nèi)暫態(tài)信號(hào)的譜能量比值是否超過(guò)給定門(mén)檻值的數(shù)目來(lái)實(shí)現(xiàn)區(qū)內(nèi)外故障的準(zhǔn)確識(shí)別。該方案在各種不同大小的母線(xiàn)雜散電容及不同接地電阻的情況下都能正確動(dòng)作，對(duì)故障合閘角不敏感，且能夠?qū)旊娋€(xiàn)末端高阻接地和區(qū)外金屬性接地進(jìn)行正確的區(qū)分。論文結(jié)合一個(gè)實(shí)際超高壓輸電線(xiàn)路系統(tǒng)，通過(guò)ATP軟件對(duì)區(qū)內(nèi)、區(qū)外及反向發(fā)生不同類(lèi)型的故障進(jìn)行仿真，對(duì)仿真試驗(yàn)所得數(shù)據(jù)的分析證明了該方案的有效性和正確性。關(guān)鍵詞：小波包分析，單端暫態(tài)量，高阻接地，母線(xiàn)雜散電
2、容THEPROTECTFORHIGHRESISITANCEEARTHFAULTOFSUPERPRESSUREPOWERTRANSIMISSIONLINEBASEDONTRANSIENTCOMPONENTABSTRACTGenerally,transmissionlinefaultcancausebothhighphasecurrent.Propergroundingprotectionsetcanactreliablyandcutofffault.However,someuniquegeographi
3、calcharacters,suchasfiregrounding,bamboogroundingandtreetopgrounding,cancausesinglephasehigh-impedancegroundingfaultfrequently.Sincethevoltageandthecurrentdropdownverylittle,themainprotectionofthefaultlinecan’tcutoffthefaultquicklyandaccurately.Atthepre
4、senttime，Domesticandinternationalrelaymanufacturertohightohinderearthtroubleyethaveabettertechnologicalmeasuretoprotect,distanceprotecttohightohinderearthtroubledistanceisitisittripandhavemoredifficultdiscriminationstotroublepositiontoselecttoprotect.Di
5、fferenceprotectionisitcanmakesurebothsidesmovementdancethetroublepicturebasicallytoprotect.Butisitisitwatchtoanalyzetorunfromsceneprotection,computercircuitprotectcommonlyuseddirectionhighfrequencyprotect,astohightohinderearthtroubleprotectsensitivityto
6、beenough.Generallyspeaking,atpresenthightohinderanalyticmethodthatgroundprotectionspendstoreinenough,thestandardizedcharacteristicvectorlimitstheutilizationratiototheinformationthatcanbeobtainedofthesystemgreatly,makeitstartandisitstoredifficultyintosel
7、ectnottoprotect,thusinfluencedtheperformanceoftheprotector.So,detectingandfindingthisfaultintimeisveryimportant.It’sverynecessarytodevelopanewhigh-performancescheme,whichinvolvesbothprincipleandhardware.Combinedwiththecharacterofthesuperpressurepowertra
8、nsmissionlinefaulttransientcurrent,TheProtectforhighresistanceearthfaultofsuperpressurepowertransmissionlinewithoneterminaltransientcomponentbasedonwaveletpacketalgorithmisproposed.Thisschemeuseswaveletpacketalgorithmtodistilltra
