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一起罕见的220kV架空线路雷击故障跳闸分析.docx

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一起罕见的220kV架空线路雷击故障跳闸分析 Abstract Lightningstrikesfrequentlyoccurinoverheadpowerlines,causingfaultsandinterruptioninpowersupply.Inthispaper,ararecaseoflightningstrikefaultina220kVoverheadpowerlineisanalyzed.Thefaultresultedintripofthebreaker,interruptingpowersupply.Thecausesandeffectsoflightningstrikesonpowerlinesarediscussedalongwithvariousprotectionmeasuresadoptedinpowersystems.Thefaultanalysisandmeasurestakentopreventsuchfaultsinfuturearealsodiscussed. Introduction Lightningisanaturalphenomenonthatposesagreatthreattooverheadtransmissionlines,especiallywhensuchlinesarelocatedinareaspronetolightningstrikes.Thedamagecausedbylightningstrikestothepowersystemequipmentcanbecatastrophic,includingflashovers,insulationdamage,equipmentdamageandevendeathofpersonnel.Therefore,itiscriticaltoadoptsuitableprotectivemeasurestopreventorminimizethedamagecausedbylightningstrikestopowersystems. Thispaperanalyzesararecaseofa220kVoverheadpowerlinelightningstrikethatresultedinafaultandtripofthebreakerleadingtointerruptioninpowersupply.Thecausesoflightningstrikesandtheeffectsofsuchstrikesonpowersystemsarediscussed.Variousprotectionmeasuresadoptedinpowersystemstopreventsuchfaultsarealsodiscussed.Finally,thefaultanalysisandmeasurestakentopreventsuchfaultsinthefuturearediscussed. CausesofLightningStrikes Lightningstrikesarecausedbythebuildupofelectrostaticchargesintheatmosphere.Asthechargesbuild,theycancreateelectricaldischargesbetweenclouds,withincloudsorbetweenthecloudandtheground.Whenalightningboltstrikesapowerline,thesurgeofelectricalenergyproducedcanbeextremelydestructive.Theenergysurgecancauseanarcflash,whichcanleadtoanequipmentfailure,interruptioninpowersupplyandeveninjuryordeathofpersonnel. EffectsofLightningStrikesonPowerLines Whenlightningstrikesanoverheadpowerline,theenergysurgecausesanelectricalarc,whichcandamagethepowerlineequipment,causeafaultandtripthebreaker,leadingtointerruptioninpowersupply.Theenergysurgecanalsocauseanarcflash,whichcanleadtoinjuryordeathofpersonnel.Thesurgec