架空送电线路雷电绕击分析及对策

Analysis on Lightning Shielding Failure of Overhead Transmission Line and Its Countermeasure

电力系统方面的过电压保护一直受非常重视,但系统内每年均会发生较多的各种过电压事故和障碍,其中雷击跳闸在线路故障跳闸中所占比例最大,而在运行工作中,因计算雷电绕击率较小,一般较易忽视雷电绕击问题。分析达州电业局电网220 kV代余线发生的雷击跳闸,探讨电力系统的雷电绕击问题。

Much attention is always paid to overvoltage protection in power system, but there are various overvoltage accidents happened annually, in which the proportion of lighting- stroke trip - out is much bigger to line fault tripping. Because the calculated rate of shielding failure is quite small, the problem of lightning shielding failure is usually neglected. The lightning trip - out happened on 220 kV Dai - Yu transmission line in Dazhou power grid has been analyzed, and the lightning shielding failure in power system has been discussed as well.