某矿区防雷改造措施分析

针对某矿区220kV线路根据雷电分布图采取的差异性防雷措施效果不理想的问题,分析了风速对线路绕击性能的影响;并结合风速风向和雷电分布图,对该矿区采取以下防雷改造措施:在与风向垂直的线路区的背风侧安装线路避雷器防绕击;对属于危险区域且线路与季风垂直的区域,采用防低接地电阻和安装线路避雷器防反击和绕击;对属于危险区域但受季风影响不是很大的区域,降低杆塔接地电阻防反击。实际运行效果表明,采取防雷改造措施后该矿区线路取得了较好的防雷效果。

Analysis of reform measures of lightning protection of a mine

In view of problem of unefficient effect of differentiated lightning protection measure adopted according to lightning distribution maps of 220 kV line of a mine,impact of wind speed on performance of lightning shielding failure of line was analyzed.The following reform measures of lightning protection were adopted combining with wind speed,direction and lightning distribution maps:install line arresters along the lee side of lines perpendicular to the wind direction to defend shielding failure;install anti-low grounding resistance and line arresters in areas which are belong to hazardous areas and whose lines are perpendicular to the monsoon direction to defend counterattack and shielding failure;reduce grounding resistance of tow in areas which are belongs to hazardous areas and not affected by the monsoon to defend counterattack.The actual operating results show that the lines have good lightning protection performance after reform.