基于磁带测量法的输电线路绕击和反击判别

Differentiation of Lightning Shielding Failure and Back Flashover in Transmission Line Based on Magnetic Links Method

分析雷害、鉴定雷击跳闸事故在电力系统防雷中具有重要意义。根据雷电绕击和反击机理,提出可在杆塔不同部位加装磁卡测试设备,将获得的雷电流幅值、最大陡度等参数进行数据分析,得出线路绕击、反击的判别方法。最后通过EMTP软件进行仿真,表明绕击、反击的数据分析结果区分显著。

It is very important to analyze the lightning dangers, identify the responsibility of lightning strike outage. Based on theories of shielding failure and back flashover, the testing equipment of magnetic card is suggested to be fixed on different positions of the tower. So the lightning parameters of lightning supreme steepness and lightning peak currents are obtained. A new way for the differentiation of shielding failure and back flashover is obtained by analyzing the data. Simulation results of calculation example on EMTP reveal that the shielding failure and back flashover are clearly differentiated.