输电线路避雷线断线原因分析及对策

Analysis and Countermeasures of Lightning Line Disconnection for Transmission Line

针对一起雷击引起避雷线断线并挂搭在铁路接触网导致接触网跳闸的事件原因进行分析。事件是由强雷击导致#4杆塔避雷线断线,而后避雷线脱落碰到A相导线,在断线冲击力及短路故障电流的作用下#5塔避雷线悬垂线夹处烧断脱落。最后提出了重要交叉跨越点防止避雷线断线的对策:更换短路热稳定容量不达标的避雷线、优化悬垂金具布置方式、安装线路避雷器。

In this paper, the causes of an event caused by a lightning strike causing the lightning protection line to break and hangs on the railway contact network to cause the contact network to trip are analyzed. The event is caused by a strong lightning strikes #4 tower lightning line broken,and then the lightning protection line falls off and hits the A-phase conductor. Under the action of the broken line impact force and the short-circuit fault current, the #5 tower lightning line suspension line clip is blown off. Finally, the countermeasures for preventing the lightning break of the lightning protection line from the important cross-over crossing points are proposed: replacing the lightning protection line with short-term thermal stability capacity that is not up to standard,optimizing the layout of the overhanging fittings, and installing the line arrester.