10kV架空裸导线配电线路雷击影响因素分析

从10 kV配电线路的直击雷和感应雷击跳闸机理出发,首先分析雷电地闪密度、雷电流幅值概率分布对线路跳闸的影响。其次,分析线路处于山顶、山腰、山底三种不同地形地貌情况时的10 kV架空配电线路直击雷和感应雷受雷宽度。再次,根据规程法分析10 kV架空配电线路附近存在输电线路时,输电线路与配电线的水平距离大小对其直击雷受雷宽度的影响。最后,根据电气几何模型和雷电先导模型,分析存在高耸建筑时10 kV配电线路周围的电场变化情况,为对10 kV配电线路的雷击风险评估提供依据。

Analysis on Influencing Factors of Lightning in 10 kV Overhead Bare Conductors

Based on the lightning trip mechanism for the direct strike lightning and induction lightning of 10 kV distribution line,fist the effect of ground flashover density,lightning current amplitude probability distribution on line trip is analyzed.Second,the lightning suffer width of the direct strike lightning and induction lightning of 10 kV overhead distribution line under three different terrain situations of the top,middle,bottom of the hill.And then,when the transmission lines exist near the 10 kV overhead distribution lines,the effect of the the horizontal distance from the transmission line to the distribution line on the lightning suffer width of direct strike lightning is analyzed based on procedures method.Finally,based on the electrical geometry model and lightning pilot model,the change of electric field around 10 kV distribution lines in the presence of high-rise buildings is analyzed,and which provide the basis for 10 kV distribution line lightning risk assessment.