同塔四回输电线路雷击闪络位置分布特性

Lightning Strike Flashover Position Distribution Characteristic of Quadruple Circuit Transmission Lines on the Same Tower

为了研究同塔多回输电线路雷击闪络位置分布特性,基于先导发展法的绝缘子闪络模型,通过实验分析不同类型绝缘子在工频工作电压下的雷电反击和绕击闪络特性,建立符合实际工况的同塔多回线路雷击仿真模型。基于该模型,通过计算得到了典型同塔四回线路雷电反击、绕击闪络位置的分布规律,并发现雷击闪络位置与线路塔型尺寸、回路布置方式和绝缘配置、杆塔接地电阻、雷击位置和雷击时工频电压相位、地线保护角、地形地貌等因素密切相关。

In order to study distribution characteristic of lightning strike flashover position of multi-circuit transmission lines on the same tower, the paper uses the insulator flashover model based on the antecedent development method to make experiment and analyze characteristics of lightning strike-back and shielding failure flashover of different typed insulators under the working frequency voltage. Meanwhile, it builds a simulation model of lightning strike for multi-circuit transmission lines on the same tower according with the actual working situation. On the basis of this simulation model, it obtains distribution laws of lightning strike-back and shielding failure flashover positions of typical quadruple circuit transmission lines on the same tower by means of calculation. It also discovers that the lightning flashover position is closely related to some factors including tower size, circuit arrangement and insulation configuration, tower grounding resistance, lightning strike position and working frequency voltage phase, protection angle of the ground wire, topographic features, and so on.