基于500 kV变电站的直击雷防护设计比较

Comparison of Direct Lightning Protection Design Based on 500 kV Substation

摘要:

折线法被广泛应用于500 k V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。

Abstract:

As the maturity of material technology increases, composite materials are gradually increasing in the application of transmission line tower engineering. According to the analysis of the earthquake disaster situation in a certain area from 2008 to 2017, statistical analysis was carried out on the damage of transmission lines caused by earthquakes. The damage distribution of transmission lines in high-intensity earthquake areas is discussed. By comprehensively considering the influence weight of three indicators (ground acceleration, slope steepness, and distance from the epicenter), the area was divided into three zoning schemes. After analysis, it was found that using the weighted comprehensive method to analyze the earthquake damage zoning of transmission lines is feasible, and the zoning scheme determined by the weighted factor of three indicators can better reflect the adverse geological conditions of the foundation of the transmission line tower. This method can also be used for the earthquake zoning assessment of transmission lines in areas where historical earthquake data is lacking, so as to provide a reference for the seismic design of transmission lines in similar areas.