地形参数与雷电活动特征对输电线路绕击性能影响的分析

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1、西南交通大学硕士研究生学位论文第

2、II页AbstractCurrently,LightningshieldingfailureisthemainreasonthatendangersthesafetyandreliabilityofEHV／UHVtransmissionline．However,transmissionlinecorridorthroughthewilderness，hills，mountainsandothercomplexterrain,Thelightingshieldingfailureperform

3、ancealeinfluencedbytheterrain．atthesametime，lightninglocationsystemhasbeenrunningformanyyearsandaccumulatedvastamountsofdata．SOitisnecessarytoresearchlightningparameterfeaturesandterrainparametersaffectingonshieldingfailureperformance．Thelightingshieldingfailureper

4、formanceareinfluencedbytheterrain,andchangingofgroundwiresandconductor．Inthispaper,themethodofgettingthemicro-topographyandtherelativepositionbetweenthewire，groundwireandgroundisproposed,andthencombinedwithelectricalgeometrymodeltocauclateshieldingfailuretripoutrat

5、e．Firstofall，thetransmissionlinecoordinateweredivideintomanysimilarsegment，usingGoogleEarthsoRwarctoobtainthealtitudeofeverypo缸andobtainthegroundelevation；secondly,accordingthecharacteristicsofleadandthealtitudeofeverypointtoobtaintherelativepositionbetweengroundwi

6、re，conductorwireandtheground；Lastly,basedonelectricalgeometrymodel，calculatingtheshieldingfailuretripoutrateofeachsegmentandtowelTakea500kVtransmissionlineasanexample，analysisoftopographiceffectsonmaximumshieldingfailurelightingcurrent．Andthechangingoftheshieldingf

7、ailurenipoutratealongthespan．Thelightingshieldingfailureperformanceisinfluencedbythelightingparametercharactedsfics．Themethodofdividingstatisticalregionaloftransmissionlinecorridorisproposed．Statisticalareaisaspanlengthonthedirectionoftransmissioncorridor，andforace

8、rtaindistancetotheverticaldirectionoftransmissioncorridorandthetowerofthespanend(thedistanceismorethanequaltothelightninglocationsystemaccuracy)．Basedonthelightninglocationsystemdatafrom1999to2008，usinggeographicinformationsystemsoRwaretostatisticthelightningparame

9、tersofHuizhouregionandNengBotransmissionline．AndthentaketheNengBotransmissionlineaS觚example．analysisoflightingparametereffectsonshieldingperforma