110kV贵州剑牵线雷害事故分析及防雷措施的探讨

Analysis of the Lightning Strike Fault of 110 kV Jianqian Transmission Line in Guizhou and Lightning Protection Measures

110 kV输电线路所经地多为山区,因其地势高,档距大,杆塔接地电阻超标等原因极易遭受雷击而发生雷击跳闸事故。笔者在具体调查了贵州110 kV剑牵输电线路遭受雷击后的雷击点状况和绝缘子闪络烧伤痕迹资料后,结合有关理论分析指出:雷电反击过电压和接地电阻严重超标是导致该线路经常跳闸的主要原因。结果表明:只有采取降低杆塔接地电阻、加装侧向避雷针、加强绝缘和加装均压环等措施才能有效减小雷击对该线路造成的损害。基于此分析结果,提出了几种减少高压输电线路雷击跳闸率的措施,对实际防雷工作具有一定的意义。

Most of 110 kV transmission lines are located in mountainous areas, so they are apt to be struck by lightning and suffer frequent tripping because of high lands, large tower span and excessive tower grounding resistance. The lightning strike points and the flashover marks of insulators of Guizhou 110 kV Jianqian transmission line was investigated and analyzed according to relevant theories, it was indicated that frequent tripping is mainly due to over-voltage lightning and seriously excessive tower grounding resistance. The result showed that in order to reduce damage caused by lightning strike on the transmission line, measures must be taken to reduce tower grounding resistance, enhance insulation level and install side lightning rods and grading rings. Based on the above analysis, several measures was proposed to reduce lightning trip-out rate of high voltage transmission lines, which have a certain significance to prevent lightning accidents.