朱建刚，魏佩瑜，刘澍存，马庆玉

（1.山东理工大学 电气与电子工程学院，山东 淄博 255049；2.国网安徽省电力公司宿州供电公司，安徽 宿州 234000）

基于时差比较的配电网含分支混合线路行波故障定位研究

朱建刚1，魏佩瑜1，刘澍存1，马庆玉2

（1.山东理工大学 电气与电子工程学院，山东 淄博 255049；2.国网安徽省电力公司宿州供电公司，安徽 宿州 234000）

针对配电网线路主体多为含分支的“架空线—电缆”混合线路这一异于输电线路的特征，建立配电网常见的“架空线—电缆—架空线”三段式混合线路模型，每段设置分支。在此基础上，提出了一套针对该线路的故障定位方法，利用比较特殊点故障时和一般点故障时每段线路各分支末端行波到达时刻与线缆连接点行波到达时刻差值的方法，确定故障发生在三段中哪一段。再进一步选择两两分支线路末端行波时差比较，确定故障发生于具体哪一分支线路，最后提出使用综合行波测距方法，确定在分支线路中具体故障位置。PSCAD仿真结果表明，该套定位方法能较为准确地选出故障区段，并确定故障位置，且不受故障类型和过渡电阻的影响，可靠性和准确性较高。

含分支；混合线路；时差比较；综合行波测距

Abstract:Aiming at the characteristic of the distribution network whose main body is the overhead line and cable hybrid line，which is different from the transmission network，we establish the model of commonly appeared “overhead line-cable-overhead line” three stage hybrid line with respective branches.On the basis of this model，a set of fault location method for the specific configuration is proposed.The comparison between the time differences of travel wave arrival at the end and the connection point of each branch for special point and general point fault is used to judge the section of the fault.Then，by comparing the travel wave arrival time at the end of each branch，the location of the fault can be finally determined.The integrated traveling wave ranging method for determining the specific fault location in the branch is proposed and clarified by the end.PSCAD simulation results show that the set of positioning method can select the fault section more accurately and determine the fault location without being affected by the fault type and transition resistance.Therefore，the reliability and accuracy are enhanced.Key words:branched；hybrid line；time difference comparison；integrated traveling wave ranging

0 引言

随着我国城市负荷密度的增加和供电可靠性要求的提高以及城市市容美化的需要，电缆线凭借自身输电可靠性高和不占用城市空间的优势在中低压配电网系统中发挥了重要作用，架空线与电缆混合线路也成为10 kV配电网网架结构的主体线路。……