高海拔地区500 kV线路降压运行工况下雷电侵入波过电压及避雷器优化配置

Lightning Intrusive Wave Overvoltage and Optimal Lightning Arrester Arrangement of 500 kV Lines in Step-down Operation at High Altitude

依托吉隆500 kV变电站新建工程,计算不同运行方式下高海拔地区降压运行的500 kV线路分别遭受雷电反击和雷电绕击时变电站内的雷电侵入波过电压;计算常规220 kV线路遭受雷击时变电站内的雷电侵入波过电压并与降压运行的500 kV线路遭受雷击的情况进行对比,发现两种情况下变电站内的过电压水平存在一定差异,基于本文的计算条件分析造成差异的原因;确定该变电站的避雷器优化配置方案,并对避雷器优化配置方案的保护效果进行了验证。

Relying on Jilong 500 kV substation project,the lightning intrusive wave overvoltage of the substation in the high-altitude area when the 500 kV line suffered from lightning strike is calculated under different operation modes;The lightning intrusive wave overvoltage of the substation when the 220 kV line suffered from lightning strike is also calculated.It is noticed that there is a certain difference in the overvoltage level in the substation under the two conditions,based on the calculation conditions in this article,the reasons for the difference are analyzed;the optimal configuration of the arrester of the substation is determined,and the protection effect of the optimal configuration of the arrester is verified.