采用避雷器后输电线路仿真模型的建立及应用现状

Research on Transmission Line System Simulation Models with Line Arrester and Its Application

为了评价输电线路的防雷性能,准确地对杆塔、避雷器、雷电流和输电线路等电力元件进行等效是非常重要的。杆塔模型在工程中宜采用电感模型,在超高压系统、杆塔高度超过40m时,宜采用多波阻抗模型;避雷器使用IEEE推荐的频率相关模型;雷电流宜选用简单方便的双指数函数模型;输电线路选用Jmarti模型。总结了杆塔接地电阻、避雷器安装方式和线路档距对线路耐雷水平的影响,试验表明,采用避雷器和降低杆塔的冲击接地电阻,输电线路的耐雷水平明显提高。

In order to estimate the lightning withstand level of transmission line, it is very important to build up to simulate the tower, line arrester, lightning current, transmission line and other power components. In the engineering model, the tower should be simulated by an impedance, the tower of height above 40m at EHV system by a multi-wave impedance, the arrester by a frequency related model as recommended by IEEE, lightning current by a double exponential model, the transmission line by Jmarti model. The effect of tower grounding resistance, line arrester installation mode and line span distance on the lighting withstand level of transmission line is summarized. The tests show that lightning withstand level can be increased greatly by using line arresters or reducing the tower grounding resistance.