高抗对500kV HGIS变电站防雷配置的影响分析

Analysis of impacts of reactor on 500kV HGIS substation lightning protection calculation

在500kV HGIS变电站防雷分析中,线路高抗会对线路侧电压互感器(CVT)和GIS套管的雷电过电压产生重大影响,以至于影响变电站的防雷保护配置,因此有必要对进线端设备的雷电过电压进行仿真分析,以及优化进线端设备的防雷保护配置。以某500kV HGIS变电站为例,采用国际通用的电磁暂态仿真计算程序EMTP,分析了高抗对变电站防雷配置的影响;研究了线路侧避雷器的安装位置对高抗以及线路侧CVT的雷电过电压水平的影响,结果表明避雷器安装在高抗和CVT中间位置附近时,避雷器能同时保护高抗和CVT,并能提高进线端设备防雷的整体水平。根据仿真结果,提出了该变电站母线和高抗回路的防雷保护优化配置方案。

In the analysis of 500 kV HGIS substation lightning protection,the line’s shunting reactor has impacts on the lightning over-voltage of line’s CVT and the GIS,so the whole substation’s lightning protection scheme will be changed. It is necessary to analyze the lightning over-voltage of the line end equipments,and to optimize the lightning protection scheme. Take a 500 kV HGIS substation as example and use the Electromagnetic Transient Program（ EMTP） as simulation tool,the impacts of line’s shunting reactor on substation lightning protection are analyzed. And also the effects of installation position of the lightning arrester on lightning over-voltage level of the reactor and line’s CVT are studied. The results show that when the lightning arrester is installed in the middle of the reactor and CVT,the lightning arrester can both protect the reactor and CVT,and improve the lightning protection level of the station. Based on the research,the bus bar and line’s reactor need to install a lightning arrester.