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连续雷电冲击下典型杆塔接地装置冲击接地电阻分析 Title:AnalysisofImpulseGroundResistanceofTypicalTowerGroundingSystemsunderContinuousLightningStrikes Abstract: Inthispaper,weanalyzetheimpulsegroundresistanceoftypicaltowergroundingsystemsundercontinuouslightningstrikes.Thelightningstrikeprotectionsystemplaysacrucialroleinensuringtheintegrityandreliabilityofoverheadtransmissionlines.Theproperdesignandanalysisofgroundingsystemsarenecessarytomitigatetheeffectsoflightningstrikesontransmissiontowers.Thispaperfocusesontheanalysisofimpulsegroundresistance,whichisacriticalparameterinevaluatingtheeffectivenessofgroundingsystems.Throughdetailedcalculationsandsimulations,theimpactofcontinuouslightningstrikesonvarioustypesoftowergroundingsystemsisevaluated,enablinganinformeddesignandselectionprocessforlightningprotectionmeasures. 1.Introduction 1.1Background 1.2ObjectivesandSignificanceoftheStudy 1.3StructureofthePaper 2.BasicsofLightningStrikes 2.1LightningFormation 2.2LightningStrokeCharacteristics 2.3EffectsofLightningStrikesonTransmissionTowers 3.TowerGroundingSystems 3.1PurposeandFunctionofTowerGroundingSystems 3.2TypesofGroundingSystems 3.2.1VerticalGroundingSystems 3.2.2HorizontalGroundingSystems 3.2.3CombinationGroundingSystems 3.3FactorsAffectingGroundResistance 4.ImpulseGroundResistanceAnalysis 4.1ImpulseGroundResistanceCalculationMethods 4.2LightningCharacteristicsandParameters 4.3ModelingandSimulationTechniques 4.3.1FiniteElementMethod 4.3.2LightningElectromagneticSimulation 4.3.3GroundingSystemResistanceMeasurement 5.CaseStudies 5.1SelectionofTowerGroundingSystems 5.2ComparativeAnalysisofDifferentTowerGroundingSystems 5.2.1VerticalGroundingSystems 5.2.2HorizontalGroundingSystems 5.2.3CombinationGroundingSystems 5.3EvaluationofGroundingSystemPerformance 5.3.1ImpulseGroundResistance 5.3.2StepandTouchVoltageAnalysis 5.3.3CurrentDistributionAnalysis 6.ResultsandDiscussion 6.1ComparativeEvaluationofGroundingSystemPerformance 6.2CorrelationBetweenImpulseGroundResistanceandLightningStrokeCharacter