高压输电线路雷电绕击分析方法及模拟试验研究*

大量线路雷电跳闸故障统计资料显示，雷电绕击是引起电压等级为500 kV及以上输电线路雷击跳闸的主要原因。综述了几种有代表性的输电线路雷电绕击分析方法，并介绍了在南方电网昆明特高压基地开展的雷电绕击模拟试验研究。试验模拟了下行雷电先导接近线路时输电线路上行先导起始和发展的过程。试验结果表明，导线、地线会产生上行先导放电，且地线上行先导放电起始易于导线，导线、地线上行先导发展速度约为1.2～2.4 cm/?s。该结果可为雷电绕击分析提供了试验基础和物理参数。

Analysis and Simulation Experiment Research on Shielding Failure of High Voltage Transmission Line

A large number of statistics information about transmission line trip failure indicates that the 500 kV and above line trip failure is mainly due to the lighting stroke of power lines. In this paper, several typical analytical methods for shielding failure of transmission lines are reviewed, and the observation of simulation tests for shielding failure of transmission lines performed in the UHV test base of China Southern Power Grid (CSG) at Kunming is reported. The tests simulated the inception and development processes of upward leader from power lines and ground wire while a downward lightning leader approaches the transmission line. The test results show that there were upward leader inceptions appeared on both power line and ground wire, and more easily occured on the ground wire, and the velocity of upward leader emerged from the power lines or the ground wire was about 1.2~2.4 cm/?s. The results can provide experimental fundament and phisical parameters for lightning shielding failure analysis.