资源描述：
《小电流接地系统单相接地故障过程分析论文》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、[摘要]电力系统中性点的接地方式对于电网的运行至关重要。目前主要的接地方式有中性点不地、中性点直接接地、中性点经电阻接地、中性点经消弧线圈接地。我国中、低压配电网中性点大多数采用小电流接地方式，即中性点不接地，经高电阻接地或者经消弧线圈接地。在配电网中，单相接地故障率最高，尽快选出故障线路，对于系统的正常运行具有重要意义．通过对配电网单相接地故障暂态过程的深入分析得知：线路存在串联谐振过程和并联谐振过程，线路发生谐振时，故障线路的阻抗时而呈容性，时而呈感性，其特性受系统出线数、各线路长度等因素的影响较大，此时故障线路零序电流与所有非故障线路
2、零序电流关系较为复杂。大量仿真实验的结果表明：本文提出的选线方法受故障点位置、故障时刻、过渡电阻等因素影响较小，具有可靠性高、抗干扰能力强的特点，适用于中性点不接地和经消弧线圈接地的配电网。该方法具有重要的理论意义和一定的实用价值。[关键词]小电流接地系统；相频特性；单相接地故障；暂态信号GroundfaultlocationdistributionmethodresearchGuoYongji(Grade07,class3,MajorEngineering&Automation,ElectronicengineeringDept,Shaa
3、nxiUniversityofTechnology,Hanzhong,Shaanxi)Tutor:LiYingfengAbstractPowersystemforgridneutralgroundingmethodofoperationisveryimportant.Atpresentthemaingroundingmethod,aTVferro-resonanceneutralgrounding,neutraldirectlybytheresistancegrounding,neutralgroundingofarcextinctionc
4、oil.China,lowvoltagedistributionnetworkinthesmallcurrentgroundingmostuseneutralway,namelyferroresonance,viahighresistancegroundingofarcextinctioncoilorfromtheground.Indistributionnetwork,thehighestrateinsingle-phaseearthprotectionfaultline,assoonaspossibletochoosethenormal
5、operationofthesystemhasimportantsignificance.Throughthedistributionnetworkphase-to-groundfaulttransientprocessofin-depthanalysisofnetwork(thatlinesexistandparallelresonantprocess,processinresonancecircuit,thefaultlineintheimpedancesometimescapacitive,sometimesbyaperceptual
6、,itscharacteristics,numberofeachlinesystemtoqualifythelengthofthefactorssuchaslargerInowzerosequencecurrentfaultlinefaultlinewithallthezerosequencecurrentrelationshipismorecomplicated.Simulationresultsshowalocationmethodof:inthispaper,thefaultpoint,failuremoments,etc.Influ
7、enceofinterimresistancesmaller,hashighreliabilityandanti-interferenceability,applicabletothecharacteristicsofferroresonanceandthedistributionofarcextinctioncoilgrounding.Thismethodhastheimportanttheoreticalandpracticalvalue.Keywords:thesmallcurrentgroundingsystem;Phasefreq
8、uencycharacteristics;Phase-to-groundfault;Transientsignal目录引言第1章绪论…………………………………………………11．1
