10kV配电线路避雷器优化布置研究

Research on Optimal Configuration of Lightning Arrester for 10kV Distribution Line

雷击跳闸是10 kV配电线路运行维护面临的主要问题之一。文中在Agrawal模型的基础上,在ATP/EMPT建立了计及导线耦合效应的10 kV三相导线雷电感应过电压模块。研究了雷击距离线路50 m情况下的感应雷跳闸概率,结果发现:跳闸所需最小雷电流幅值均随绝缘子50%闪络电压的增大而呈线性增加;分支处更易发生绝缘闪络。研究了避雷器布置方式,结果发现:相同安装密度下,三相避雷器分散安装比集中安装的效果更好;对于分支杆塔,宜在最近干线或支线杆塔上安装避雷器。

Lightning trip-out is one of the major problems in operation and maintenance of 10 kV distribution lines.Based on the Agrawal model,a lightning-induced overvoltage module of 10 kV three-phase conductor is established in ATP/EMTP considering the conductor coupling effect.The trip-out rate of induced overvoltage is studied when lightning stroke is 50 m far away from the line,and the results show that the minimum lightning current amplitude required for tripping increases linearly with the increase of 50%flashover voltage of insulator,and insulation flashover occurs more easily at branch.The arrangement of lightning arrester is also studied,and the results show that under the same installation density,the effect of scattered installation of three-phase arrester is better than the centralized installation,and for branch tower,it is better to install arrester on the nearest main line or branch line tower.