220kV同塔线路雷击同跳故障分析及防治措施

Simultaneous Lightning Trip-out Failure Analysis and Prevention Measures of 220kV Multi-Circuit Power Transmission Line on the Same Tower

同塔多回线路遭受雷击容易出现多回线路同时跳闸事故,对电力系统安全运行造成极大威胁,研究如何防治同塔线路雷击同跳措施具有重要意义。本文分析广东电网近年220kV同塔线路雷击跳闸与雷电活动的相关性,结合线路雷电定位、故障录波及ATP仿真结果,对220kV同塔线路典型雷击同跳故障进行分析。介绍了广东电网同塔线路差异化防雷技术和防雷改造实施情况,通过改造前后实际防雷运行数据对比,分析了各种措施防治雷击同跳的效果。统计结果显示,基于不平衡绝缘配置的差异化防雷措施,可有效降低同塔线路雷击跳闸和雷击同跳故障比例,对于我国多雷区、强雷区同塔线路防雷保护具有重要参考价值和指导意义。

Simultaneous lightning trip-out failure always occurs while multi-circuit power transmis-sion line on the same tower suffers lightning strike,which poses a threat to the supply safety and stabilityof power system. Therefore,it makes great significance to research prevention measure to guard againstsimultaneous lightning trip-out failure. Analysis and contrast is carried out to find relationship betweenlightning activity and simultaneous lightning trip-out failure of 220kV multi-circuit power transmissionline of Guangdong Grid in recent years. Failure analysis of typical 220kV simultaneous lightning trip-outincident that happens recently is made in ATP with the results of lightning location system and lightningwave record. Differentiated lightning protection technology of multi-circuit power transmission line on thesame tower of Guangdong Grid is introduced. The paper makes statistics about lightning protection reformimplement and practical operation data before and after reform,and compares effect of different measurespreventing simultaneous lightning trip-out failure. It results that differentiated lightning protection reformcan effectively reduce ratio of simultaneous lightning trip-out failure. The research is instructive for thefuture simultaneous lightning trip-out failure prevention work of multi-circuit power transmission line.