基于录波信息的双侧电源输电线路故障接地电阻计算方法

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1、基于录波信息的双侧电源输电线路故障接地电阻计算李辉，宋斌，许捷（国电南瑞科技股份有限公司江苏南京211106）摘要：针对甶山火、雷电、覆冰、污闪等自然因素引起输电线路故障是单相或相间经过渡电阻接地这一现象，首先用对称分量法分别对单相故障接地和相间故障接地进行分析，得出两种情况下故障点接地故障电流都等于故障点的总零序电流。利用故障点接地故障电流都等于故障点的总零序电流和从流入保护装置的零序电流中扣除本线路相对地的分布电容决定的零序电容电流，来计算故障点的总零序电流即接地故障电流。利用各序对称分呈之间的电压关系是相互独立特性，首先把保护装置的

2、录波数据电压量计算出线路始端三序电压分量，分别计算故障点故障相的各序电压，然后叠加成故障点处故障相实际电压，最后利用欧姆定律计算出接地电阻。关键词：双侧电源；对称分量法；接地电阻；零序电容电流CalculationofEarthResistanceofBilateralPowerSupplyTransmissionLineBasedonFaultInformationLIHui,SONGBin,XUJie(NARITechnologyDevelopmentLimitedCompany,Nanjing211106China)Abstract

3、：Duetotheexistenceofearthresistancecausedbyfire,lightning，ice，pollutionflashovernaturalfactors，single-phasegroundingfaultandinterphaseearthfaultgroundisanalyzedwithsymmetricalcomponentmethod,anditisconcludedthatinbothcasesfailurepointgroundingfaultcurrentisequaltothetotal

4、zerosequencecurrentoffaultpoint.Usingfaultpointgroundingfaultcurrentisequaltothepointofzerosequencecurrentanddeductedfromflowingintoprotectionofzerosequencecurrentofthiscircuitisrelativelydistributedcapacitanceofzerosequencecapacitivecurrentdecision，tocalculatethefaultpoi

5、nttotalofzerosequencecurrentasgroundingfaultcurrent.Usingtherelationshipbetweenthevoltagesequencesymmetricalcomponentarcmutuallyindependentfeatures,firstofall,theprotectiondeviceofvoltagewaverecorddatatocalculatethelinebetweenthreesequencevoltagecomponent，eachsequencevolt

6、ageoffaultphasearecalculatedrespectively,andthenintoaactualvoltagefaultpoint，finallyusingohm’slawtocalculatetheearthresistance.Keywords:bilateralpowersupply;methodofsymmetricalcomponents;earthresistance;zerosequenceCapacitivecurrent0引言电力系统输电线路大多暴辦于旷野之屮，周边环境复杂，引起线路跳闸的因素很多，

7、主要包括：山火、雷电、覆冰、雾闪、树障等，而这些因素录致输电线路故障绝大多数表现为接地故障［1］。不M因素引起的接地故障，其接地电阻值的人小上足奋差异的,计算出故障接地电附也为分析故障起因提供了必要的依裾。在现代电网保护和控制系统中，都包含有保independentfeatures,firstofall,theprotectiondeviceofvoltagewaverecorddatatocalculatethelinebetweenthreesequencevoltagecomponent，eachsequencevoltageoff

8、aultphasearecalculatedrespectively,andthenintoaactualvoltagefaultpoint，finallyusingohm’slawtocal