摘要I摘要电力电缆断线故障测距技术己经基本成熟，架空线路在线故障测距技术也日趋成熟并开始得到广泛地推广应用，虽然电力电缆在线故障测距技术还不成熟，但是电力系统对电力电缆在线故障测距的需求却越来越急迫。要实现电力电缆的在线故障测距，必须考虑的几个难题是:中性点非直接接地系统是否能产生有效的故障暂态行波；故障信息在传播过程中的特性；故障点的特性对故障行波的影响；故障信息在测量点的变化特性；如何准确确定故障行波到达时刻等。本文分析了行波故障测距方法的特点，明确了各类行波故障测距方法的优缺点。在比较了行波测距法与阻抗测距法的基础上，发现行波测距法优于阻抗测距法，因此采用低压脉冲法实现故障测距。关键词：电力电缆；行波；故障测距ABSTRACTIIABSTRACTOff-linefaultlocationforpowercableandon-linefaultlocationforoverheadtransmissionlinehavebeenaccomplishedinthepastseveraldecades.Nowadayspowercablesystemsareingreatneedofon-linefaultlocationtechnologies.Beforeachieving.thisgoal,severalimportantanddifficultproblemsshouldbethoughtofcarefully.First,whetherornotcaneffectivetravelingwaveduetocablefaultbefoundtolocatethefaultpointincablesystemwhosetransformerneutralpointnotdirectlygrounded?Second,what'sthecharacteristicofthetravelingwaveduringitspropagation?Third,willthefaultpointcharacteristicaffectthetravelingwave?Fourth,howwillthetravelingwavechangeatthemeasutingpoint?Andthelastbutnottheleast,howtodetermineaccuratelythearrivealtimeofthetravelingwave.Thispaperanalysesthetravelingwavethecharacteristicsoffaultlocation,andweknowlinesofthevariousmethodsofwavefaultlocationadvantagesanddisadvantages。Incomparingtheline-ranginglawandtheimpedanceranginglaw,onthebastofwefoundinthepowercablefaultlocationinline-rangingmethodisbetterthantheimpedanceranginglaw,wedecisionusedtolow-voltagepulsemethodtoachievefaultlocation.Keywords:powercables;travelingwave;faultlocation目录III目录第1章引言......................................................11.1课题研究的背景及意义.........................................11.2电力电缆发生故障的原因与类型.................................21.2.1故障原因...............................................21.2.2故障类型...............................................31.3电缆故障测距概述的现状.......................................41.3.1阻抗法.................................................41.3.2行波法.................................................51