摘要
低压架空线路在野外与雷击点距离较近或由于与建筑物避雷引下线的距离较近,因雷电电磁场作用于架空线路,在线上产生的感应过电压会造成线路对杆塔横担闪络.采用电磁场理论,分析了低压架空线路旁接闪物体及架空线路高度、线路与雷击点间距等参数对架空线路感应过电压的影响,推导出了架空线路附近出现雷击时在架空线路上的感应过电压计算公式.
There are tall buildings next to the low-voltage transmission lines through the city centers.If the buildings are stroke directly by lightning,the extremely high transient electromagnetic field caused by lightning current through the lightning downward lead might induce high overvoltages on the low-voltage transmission lines.If the induced lightning overvoltage exceeds the withstanding ability of the insulators,the transmission lines will flashover to the cross arm of the tower.In this paper,the equation used to calculate the induced overvoltage on the low-voltage overhead transmission lines less than 65 m far away from the lightning stroke point is deduced;and the sensitivity studies are carried out to indicate how the parameters,such as the height of transmission line,distance from the lightning stroke point,the height of the stoke building near to the transmission line and the length of possibly induced head-on lightning leader would influence the amplitude of the induced lightning overvoltage.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2011年第6期761-764,共4页
Engineering Journal of Wuhan University
关键词
架空线路
感应过电压
线路架设高度
雷击点距离
overhead line
induced overvoltage
height of transmission line
distance from lightning stoke point
