涪江大跨越雷电性能研究

采用规程法、电气几何模型(EGM)和先导发展模型算法对"±500 kV宝鸡换流站-德阳换流站直流线路"涪江大跨越的绕击闪络率进行了计算。在电气几何模型算法中,采用了随杆塔高度变化的击距系数β,以暴露弧为0时对应的雷电流作为雷电的最大绕击电流。分析了地线保护角对绕击闪络率的影响,结果表明,绕击闪络率随保护角的减小而减小。对涪江大跨越的雷电性能的分析计算方法可以做为国内同类大跨越线路防雷设计的参考。

Research on Lightning Performance of FuJiang River Crossing

The shielding failure flashover of FuJiang river crossing is calculated by using empirical formula,the improved electro-geometric model(EGM) and leader progress model.The calculations with electro-geometric methods of shielding analysis essentially depend on the joint premises of a lightning stroke distance,and of a functional relationship between this stroke distance and the crest current amplitude of return stroke.With the increase of shielding angle and the height of the towers,the shielding failure flas...