适用于较短线路单相接地故障的测距方案  

FAULT LOCATION SCHEME FOR THE SINGLE LINE TO GROUND

作　　者：范春菊[1] 郁惟镛[1] 

机构地区：[1]上海交通大学电气工程系,上海200240

出　　处：《继电器》1999年第5期17-19,共3页Relay

摘　　要：根据较短线路输电线的特点，即输电线线损较小，可以忽略不计的特点，利用正常运行时所测量到的电压、电流可以计算出对侧系统的综合阻抗，利用单相接地故障时的序网图以及序电流之间的关系，可以求解出本侧系统的综合正序阻抗、零序阻抗以及对侧系统的综合零序阻抗，从而克服了传统故障测距中，由于无法确知对侧系统的信息而引起的较大的测距误差。经仿真计算证明，本方案用于较短输电线测距时，测距精度高，且不受大过渡电阻的影响。According to the characteristic of the transmission line of less length, namely, less line loss, which can be ignored, the paper takes advantage of the voltage and current that is measured during the normal running type, calculating the synthesized impedance of the remote end. At the same time, the paper makes use of the sequence networks and the relationship of the positive sequence current and the zero sequence current, calculating the synthesized impedance of the locating end and the zero synthesized impedance of the remote end, calculating the distance between the fault and the fault locating equipment, The scheme overcomes the conventional fault location′s error because of having no idea of the information of remote end. It is proved by simulation by EMTP, if the plan is used to transmission line of less length, the accuracy of the fault locating is very high, being not subjected to the high transition resistance.

关 键 词：故障测距 单相接地 EMTP 高压输电线路 

分 类 号：TM855[电气工程—高电压与绝缘技术]