输电线路雷击故障情况下的短路点定位方法  

Locating Method of Short-circuit Point for Transmission Lines Under Lightning Stroke Fault

作　　者：郭宁明[1] 覃剑[1] 

机构地区：[1]中国电力科学研究院,北京市100192

出　　处：《电力系统自动化》2009年第10期74-77,85,共5页Automation of Electric Power Systems

摘　　要：输电线路雷击故障情况下,由于雷电流幅值差异较大,有可能导致雷击点与短路点位置不同,这就影响了行波测距的精度。此时,雷电波在短路点发生反射,而利用雷电波和短路点反射波到达的时间差可以计算雷击点与短路点的间距。基于上述分析,提出在已知雷击点时,通过计算雷击点与短路点的相对位置,从而实现对短路点定位的新方法。同时也分析了可能影响该短路点定位的相关因素。EMTDC仿真及实例验证证明了所述短路点定位方法的正确性。Location of lightning point and fault point may be different under lightning stroke fault of transmission lines, because the amplitude of lightning current is tremendous difference. This may influence on precision of traveling wave locating. When lightning wave reflect at the fault point, the distanee between lightning stroke and fault points can be ealeulated with the arrival time differenee between lightning wave and reflect wave. Based on fore mentioned analysis, a new approach to locate fault point through the calculation of relative position between lightning and fault points if lightning point is known is proposed. Factors which may affect the fault locating is also discussed. The validity of the methods is proved by EMTDC simulation and confirmation of real example.

关 键 词：故障测距 雷击 行波 小波变换 短路点定位 

分 类 号：TM862[电气工程—高电压与绝缘技术]