输电线路雷电屏蔽性能计算分析

摘要

输电线路被雷击会导致十分严重的后果,因此有必要研究输电线路的雷电屏蔽性能。基于电气几何模型（EGM）和蒙特卡洛（Monte Carlo）方法,通过绝缘子50%闪络电压来确定其耐雷水平和判断绝缘是否闪络,计算线路屏蔽性能,并分析了地面倾角、线路高度等因素对绕击跳闸率对输电线路的雷电屏蔽性能的影响,发现导线越高,地面倾角越大,输电线路的雷电屏蔽性能就越低,并建议采取相应的措施以提高输电线路的雷电屏蔽性能。%If transmission line was struck by lightning,it will leads to very serious consequences.Lighting performance of transmission line using EGM and Monte Carlo method is analyzed.Line insulation flashover is judged by flashover criterion,according to the concept of lightning withstand level and based on the 50% flashover voltage of the insulator.Meanwhile,the influence of the grounding obliquity tower and the height of tower on the lightning performance of the transmission line are analyzed.A conclusion is drawn that the performance of lightning shielding for transmission line will become weaker when the height of tower and the ground inclination become larger.Finally,this paper gives some recommendations to improve the lighting performance of transmission line.