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10kV架空配电线路感应雷过电压暂态特性分析.docx

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10kV架空配电线路感应雷过电压暂态特性分析 Abstract Inductionlightningovervoltageisacommonprobleminoverheadhigh-voltagedistributionlines.Thispaperanalyzesthetransientcharacteristicsofinductionlightningovervoltageina10kVoverheaddistributionline.Thetheoreticalanalysisandsimulationresultsshowthatthelightningovervoltageinthe10kVoverheaddistributionlineismainlycausedbythecouplingoflightningelectromagneticfields,andthelightningovervoltagewillbeattenuatedwiththeincreaseinthedistancebetweentheconductorswithdifferentpotential.Moreover,thelightningovervoltagecanbereducedbyimprovingtheinsulationlevelofthetransmissionlinesandoptimizingthelinestructuredesign. Introduction Inductionlightningovervoltageisamajorprobleminhigh-voltagetransmissionanddistributionsystems.Thelightningovervoltagecancausedamagetotheinsulationofthewires,leadingtoflashoversandpoweroutages.Therefore,itisessentialtostudythetransientbehaviorofinductionlightningovervoltageinhigh-voltagedistributionlines. Inthispaper,weanalyzethetransientcharacteristicsofinductionlightningovervoltageina10kVoverheaddistributionline.Weproposeatheoreticalmodeltoanalyzethelightningovervoltageinthetransmissionline,andwesimulatethetransientbehaviorusingtheEMTPsoftware.Ourfindingscanprovideinsightintothedesignandoperationofhigh-voltagedistributionlinestopreventlightningovervoltage. TheoreticalAnalysis Thelightningovervoltageinthe10kVoverheaddistributionlineismainlycausedbythecouplingoflightningelectromagneticfields.Whenalightningstrikeoccursnearthepowertransmissionline,theelectromagneticfieldproducedbythelightninginducesavoltageinthetransmissionline,resultingininductionlightningovervoltage. Thelightningovervoltagecanbeexpressedas: Vli=k*Φ*L/(d+h) WhereVliisthelightningovervoltage,kisthecouplingcoefficient,Φisthelightningelectromagneticfield,Listhelengthofthetransmissionline,disthedistancebetweentheconductorswithdifferentpotential,andhistheheightofthetransmissionline. SimulationResults Wesimulatetheinductionlightningovervoltageinthe10kVoverheaddistributionl