接地网雷电冲击响应特性计算分析

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1、第33卷第3期高电压技术Vo1．33NO．32007年3月HighVoltageEngineeringMar．2007·75·接地网的雷电冲击响应特性计算分析何智强，文习山，王建武(武汉大学电气工程学院，武汉430072)摘要：为了分析发、变电站接地网在雷电流作用下的性能．提出了一种近似于工频情况下的节点电压法的模型．并借助软件求取接地网格在雷电流冲击响应下的电气参数。该模型借助电网络理论中节点电压法，考虑了接地导体周围土壤火花放电对雷电暂态效应、非线性火花效应和导体间互感的影响．对接地导体的土壤放电击穿建立基于分布、时变电路参数的等效电路模型．同时此法对接地网在大冲击电流作用下性能的动态趋势

2、预测提供一种思维方法。分析了针对不同地网结构、不同雷电流注入点等因素情况下的接地网冲击特性。边角注入时．注入点周围电位、散流电流、轴向电流均关于注入点所在对角线对称分布。中心点注入时．地表电位分布关于中心点对称。关键词：雷电流；接地网；火花放电；暂态效应；散流；镜像中图分类号：TM863文献标识码：A文章编号：1003—6520(2007)03—0075—04LightningImpulseResponseCharacteristicComputationandAnalysisofGroundingGridHEZhi—qiang，WENXi—shan，WANGJian-wu(SchoolofE

3、lectricalEngineering，WuhanUniversity，WuHan430072，China)Abstract：Asanimportantfactortoestimationelectromagnetismenvironmentofpowerplantandsubstation．Theperformanceanalysisunderthunderstormelectricitycurrentofpowerplantandsubstationbyscientificresearcherandengineeringrecognitionallalong．Basedonthis，th

4、epaperproposedonekindofmodelnamednodevoltagemethodwhichapproximatelywork-frequencyandbydintofATPDrawsoftwaretocomputethegroundinggridun-derthunderstormelectricitycurrentimpactresponseelectricalparameter．Themodelhadusednod~voltageofpowernetworktheoryandconsideredtheinfectionaroundthegroundingconducto

5、rofthesoilsparkdischargetothethun-derandlightningtransienteffectandestablishaequivalentcircuitmodelofgroundingconductorwhichunderthesameconditionestablishequivalentmode1．thepapercannotonlystudytheimpactreal—timeperformanceofground-inggridbutalsocanofferanewwayofthinkingtoforecastthedynamicperformanc

6、eofgroundinggrid．Paperex—haustiveanalysisthegroundinggridcharacteristicinsomefactorssuchasthedifferentnetworkstructure，thediffer—entthunderstormandlightningclasshavepouredintoandSOon．Theresultshowsthat：themagnitudeofvoltageofcenterinjectionismuchlessthanthatvergeiniection．Atthesametime，thenodepotent

7、ialofgroundinggridissymmetricaldistribution．Whentoresearchtheperformanceofgroundinggridandprojectpracticeunderthelargecurrentsuchaslightningcurrentetcwhichhavehigh-frequencycomponentswecanalsoofferare