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1、重庆大学硕士学位论文等级的输电线路绕击跳闸率，与其实际运行中的雷击数据进行对比，以对比的结果为依据，对电气几何模型和先导发展模型的适用范围给出建议。关键词：超/特高压，绕击跳闸率，电气几何模型，先导发展模型，工作电压II英文摘要ABSTRACTThelightningflashoverfaultoftransmissionlinesisatoughproblemaffectingsafepowersupplyofgrids.Inrecentyears,theACandDCUHVtransmissionlinesareputintoservicesuc
2、cessivelyinChina,sincecurrentpowergriddevelopsveryfast,thetransmissionlineaccidentscausedbylightninghavenewfeatures.Ononehand,comparedwithtraditionaltransmissionlines,E/UHVtransmissionlinesischaracterizedbyhighoperationvoltage,largetowersize,andlongdistanceandlongspanpowertrans
3、mission,whichbringsmorelightningriskstotransmissionlines.Ontheotherhand,indifferentareas,thetransmissionlinecorridor,theterrainlandform,thelightningactivityparameters,thevoltageoperationgradeandeverysectionofthelinearedifferent.Therefore,tostudythelightningshieldingmodeloftrans
4、missionlinesandthemethodtoestimatethelightningshieldingperformanceoftransmissionlines,andtoanalyzethelightningshieldingperformanceoftransmissionlinesaccurately,isessentiallyimportanttothelightningprotectiondesignandtheanalysisoflightningshieldingfailureflashoveraccidentoftransm
5、issionlines.Thephysicalapproachofelectricgeometrymodel(EGM)isdiscussedfirst,analyzingitsphysicalbasis,focusingontheconceptanddevelopmentprocessofstrikingdistance,meanwhile,EGMconcerningtheoperationvoltage，groundobliquityandwinddeflectionisintroducedbasedontheargumentation.Apply
6、ingthismodel,thelightningshieldingperformanceof±500kVEHVDCtransmissionlinestowerarecalculatedhere,Andsummarizedthevariationofmaximumshieldingfailurelightningcurrentandshieldingfailuretriprater.Theexistingleaderpropagationmodels(LPM)areanalyzedherenext,andbasedontheobservedlight
7、ningandsparkdischargedata,anewnumericalmodelforthelightningshieldingperformanceoftheE/UHVtransmissionlinesispresented,whichconsideringtheoperatingvoltage,sagandgroundobliquity.Thismodelconsideredthemainapproachesoftheearthflash,suchas:thepropagationofdescendleader,theinceptiono
8、fupwardleader,therelativedevelopmentofthedescendleader
