并行防雷措施在提高线路反击耐雷性能的应用

Application of Parallel Lightning Protection Measures to Enhancing Back-flash Lightning Withstanding Performance of Transmission Lines

采用ATP/EMTP软件对220kV输电线路建模,通过软件仿真,分析了避雷器安装方式,工频相位角及耦合地线对线路耐雷性能的影响,在这3个措施的基础上提出了3种不同的并行防雷措施,并分别验证了3种并行防雷措施的效果.结果表明:并行防雷措施比单一防雷措施的防雷效果好得多,而且在A1,A2相装设避雷器,调整工频相位角为120°,同时在离地高16m处架设一根耦合地线对线路耐雷性能的提高最为明显.

A model of 220 kV transmission line is built in ATP/EMTP;and then through simulation,the influenees of ways of arrester installation,phase angle and coupled ground on the lightning withstanding performance of transmission line are analyzed.Three parallel lightning protection measures are proposed.And then the effect of three parallel lightning protection measures are verified respectively.The results show that the effects of three parallel lightning protection measures are much better than that of these single lightning protection measures.What＇s more,arresters are installed on A1,A2;phase angle is 120°and coupled ground is installed at the height of 16 m,so as to raise the lightning withstanding performance obviously.