ElectricalAutomation电力系统及其自动化PowerSystem&Automation《电气自动化》2023年第45卷第1期基于动态接地方式的配电网单相接地故障区域隔离邓晓风1,李景禄2,徐雄军1,伊国强2(1.国网湖北省电力有限公司孝感供电公司,湖北孝感432000;2.长沙理工大学电气与信息工程学院,湖南长沙410114)摘要:中性点经消弧线圈接地配电网发生单相接地故障时,受消弧线圈调谐与过渡电阻的影响,导致故障选线和隔离困难,严重影响了人身安全与供电可靠性。为此,提出了一种基于动态接地方式的故障区域隔离方案,将消弧线圈接地改造为动态接地,对动态切换前后的各配电终端零序电流变化规律进行了理论分析,并提出节点零序电流比较法进行故障区段定位。现场试验验证了方案的准确性与可靠性,实现了0~4000Ω高阻接地故障下的区域隔离,为解决消弧线圈接地方式下的故障区段定位难题提供了工程应用案例。关键词:消弧线圈接地;动态接地;节点零序电流比较法;高阻接地:故障区域隔离DOI:10.3969/j.issn.1000-3886.2023.01.016[中图分类号]TM72[文献标志码]A[文章编号]1000-3886(2023)01-0059-03Single-phaseGroundingFaultAreaIsolationinDistributionNetworkBasedonDynamicGroundingMethodDengXiaofeng1,LiJinglu2,XuXiongjun1,YiGuoqiang2(1.XiaoganPowerSupplyBranch,StateGridHubeiElectricPowerCo.,Ltd.,XiaoganHubei432000,China;2.CollegeofElectrialandImformationEngineering,ChangshaUniversityofScience&Technology,ChangshaHunan410114,China)Abstract:Whenasingle-phasegroundingfaultoccursinthedistributionnetworkwheretheneutralpointisgroundedbythearcsuppressioncoil,itwillbeaffectedbythetuningandtransitionresistanceofthearcsuppressioncoil,resultingindifficultyinfaultlineselectionandisolation,whichwillseriouslyaffectpersonalsafetyandpowersupplyreliability.Therefore,afaultareaisolationschemebasedondynamicgroundingmethodwasproposed.Thegroundingofthearcsuppressioncoilwaschangedintodynamicgrounding.Thevariationlawofthezero-sequencecurrentofeachdistributionterminalbeforeandafterdynamicswitchingwastheoreticallyanalyzed.Thesequencecurrentcomparisonmethodwasusedtolocatethefaultsection.Thefieldtestverifiedtheaccuracyandreliabilityofthescheme,andtheregio...