考虑地线电晕影响的雷击输电线路杆塔的时域有限差分分析

Analysis on Lightning Transmission Towers with Ground Corona Based on FDTD

对雷击输电线路的研究是保障线路安全、稳定运行的重要措施。采用时域有限差分(FDTD)方法,在考虑地线产生电晕的条件下,对雷电反击输电线路杆塔进行仿真分析。仿真中采用了一个简化的电晕放电模型,分别考虑反击闪络发生在上、中、下三相导线上,对输电线路暂态过电压进行了计算分析。仿真结果表明,地线电晕可以降低雷击时杆塔的暂态电压幅值,并且增加闪络发生的时间。

The study on back-flashover at transmission line tower is important to assure the stable working of transmission lines.The back-flashover at transmission towers struck by lightning in the presence of corona emanated at the ground wire is simulated with finite-difference time-domain method.A simplified model of corona discharge is applied,and the counterattack flashover on the upper, middle and lower wires are considering,the transient overvohage of transmission lines are analyzed.The simulation results show that the ground wire corona can reduce the transient voltage amplitude of the lines and increase the duration of flashover.