耦合地线、避雷器对输电线路耐雷水平的影响分析

Analysis on Impact of Surge Arrester and Coupling Ground Wire on the Lightning Withstanding Level of Transmission Line

线路避雷器和耦合地线都能有效提高输电线路的反击耐雷水平。本文应用PSCAD仿真软件建立220 k V同塔双回输电线路的仿真模型,并进行雷击暂态分析,得到耦合地线以及线路避雷器对耐雷水平的影响,并确定了耦合地线的最佳架设位置以及线路避雷器的最佳安装个数,耦合地线最佳架设位置为下层横担与塔身交点处,单相安装时,避雷器应安装在中层,两相安装时,应都安装在中层。

Coupling ground and line arrester can effectively increase the lightning withstanding level of transmission line. The simulation model of 220 kV quadruple-circuit transmission line on same tower is established by using PSCAD simulation software, and carry on lightning transient analysis. Then the influence of coupling ground wire and line lightning arrester on lighting withstanding level is obtained, and the best position to set up the coupling ground and the best installation number of line lightning arrester are determined, the best installation location of coupling ground is the intersection point of bottom cross arm and the towers, for single-phase, an＇ester should be installed in the middle, and for two phase, all arresters should be installed in the middle.