基于500kV变电站的直击雷防护设计比较

Comparison of Direct Lightning Protection Design Based on 500kV Substation

折线法被广泛应用于500kV交流变电站的直击雷防护,滚球法主要用于换流站。但根据中国南方电网有限公司规范要求,500 k V保底变电站应采用滚球法进行直击雷防护,与通用作法不同。在分析两种算法的计算原理基础上,并以500 k V保底变电站为例,分别采用折线法、滚球法进行整站与分区域的防雷保护范围计算,并分析比较两种方法的差异及原因。最后基于500 k V保底变电站,总结折线法、滚球法的应用经验,提出了防雷设计建议。

Polygon method is widely applied in direct lightning protection in 500 k V substation,and rolling sphere method is applied in DC converter station. According to the requirements of China Southern Power Grid code,rolling sphere method should be applied in the important 500 k V substations. The calculation principles of two direct lightning stroke shielding methods are analyzed,and taking the important 500 k V substations for example,the scope of lightning protection of important 500 k V substations is calculated with these two methods. The differences of the results in two methods are compared and the reason of the differences is given. At last,the application experiences of these two methods are summarized,and the suggestions of direct lightning protection design for important 500 k V substations are given.