输电线路雷电屏蔽仿真模型

Lightning Shielding Simulation Model of Transmission Line

输电线路很容易遭受雷击 ,而屏蔽失效是线路雷害事故的重要原因 ,因此应加强对输电线路雷电屏蔽的研究。文中在对已有的输电线路雷电屏蔽模型进行充分了解的基础上 ,合理考虑了上行先导的引雷作用 ,采用变步长的方式模拟下行雷电先导的下降 ,建立了一个新的输电线路雷电屏蔽仿真模型。仿真计算结果表明 ,该模型与输电线路现场运行经验比较吻合 ,可用于输电线路的防雷屏蔽设计和评估输电线路的雷电屏蔽性能。

Transmission lines are easily hit by lightning, and lightning shielding failure is an important reason of lightning accidents of transmission line. So researches on lightning shielding of transmission line should be strengthened. On the basis of the abundant understand to known lightning shielding models of transmission line, a new lightning shielding simulation model of transmission line is presented in the paper. In this model, the effect of attracting lightning of upward leader is considered reasonably, and the method of variable descending step is adopted to simulate the descending process of lightning leader. The simulation calculating results show that the model is in good agreement with field experience of transmission line. It can guide lightning shielding design of transmission line and estimate the performance of lightning shielding of transmission line.