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1、第33卷第3期高電壓技術(shù)Vo1．33NO．32007年3月HighVoltageEngineeringMar．2007·75·接地網(wǎng)的雷電沖擊響應(yīng)特性計算分析何智強，文習(xí)山，王建武(武漢大學(xué)電氣工程學(xué)院，武漢430072)摘要：為了分析發(fā)、變電站接地網(wǎng)在雷電流作用下的性能．提出了一種近似于工頻情況下的節(jié)點電壓法的模型．并借助軟件求取接地網(wǎng)格在雷電流沖擊響應(yīng)下的電氣參數(shù)。該模型借助電網(wǎng)絡(luò)理論中節(jié)點電壓法，考慮了接地導(dǎo)體周圍土壤火花放電對雷電暫態(tài)效應(yīng)、非線性火花效應(yīng)和導(dǎo)體間互感的影響．對接地導(dǎo)體的土壤放電擊穿建立基于分布、時變電路參數(shù)的等效電路模型．同時此法對接地網(wǎng)在大沖擊電流作用下性能的動態(tài)趨勢
2、預(yù)測提供一種思維方法。分析了針對不同地網(wǎng)結(jié)構(gòu)、不同雷電流注入點等因素情況下的接地網(wǎng)沖擊特性。邊角注入時．注入點周圍電位、散流電流、軸向電流均關(guān)于注入點所在對角線對稱分布。中心點注入時．地表電位分布關(guān)于中心點對稱。關(guān)鍵詞：雷電流；接地網(wǎng)；火花放電；暫態(tài)效應(yīng)；散流；鏡像中圖分類號：TM863文獻標識碼：A文章編號：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
