先导发展模型法特高压输电线路雷电绕击分析

随着电压等级的升高,由雷电绕击而引起的线路跳闸事故所占比例越来越大。为准确评价线路的绕击耐雷性能,考虑先导发展随机性,建立了输电线路雷屏蔽性能的雷击仿真模型。模型仿真结果算得的对地击距与IEEE推荐的击距公式一致,绕击概率与雷击模拟实验结果相符,证实了模型的可信性。应用该仿真模型对特高压输电线路绕击屏蔽性能进行了评估。

Analysis of Lightning Shielding Failure for Ultra High Voltage Transmission Lines Based on Leader Progression Model

With the increase of voltage level of transmission line, the proportion of outages because of shielding failure increases ,therefore, exactly evaluating lightning-withstanding level of transmission line is especially important for system service and stable operation .Considering the randomness of leader propagation, a lightning stroke simulation model on lightning shielding performance of transmission line was presented. Shielding failure probability and stroke distance to earth, which were calculated by the simulation model, were in accordance with the results of lightning simulation experiment and the stroke distance equation recommended by IEEE.So,the simulation model, which is applied to analyzing the shielding failure characteristics of ultra high voltage transmission lines, is reasonable.