高耸建筑群对附近10kV架空线路雷击跳闸率的影响

Influence of Towering Complex on Lightning Flash-over Rate for 10 kV Distribution Lines

针对高耸建筑群的存在会降低周边10kV架空线路雷击跳闸率的问题,根据线路雷击跳闸率的计算公式分析了建筑物的存在对附近10kV架空线路雷击跳闸率的影响,并结合电气几何模型的击距理论分析了引入高耸建筑物后导线暴露弧与大地暴露弧交点的变化及建筑物相对介电常数、高度、距离、面积对雷电先导阶段导线附近电场、感应过电压和感应雷跳闸率变化的影响,为城区10kV架空线路防雷水平的评估提供一条新途径。

Aiming at the problem that high-rise buildings will reduce lightning trip-out rate nearby 10 kV overhead lines,this paper analyzes the influence of existence of buildings on the lightning trip-out rate nearby 10 kV overhead lines based on the formula of line lightning trip-out rate.Combining the lightning distance theory of electro-geometrical model,it analyzes the impact of variations of intersection point of the lines exposure arc and the ground exposure arc and its dielectric constant,height,distance,area on the electric field around the lines,induced overvoltage and the rate of induced lightning trip-out at the time of lightning leader.Thus,it provides a new method for assessment of lightning protection ability of 10kV transmission lines in urban areas.