楚雄地区500kV紧凑型线路防雷特性研究

Analysis on Lightning Protection of 500 kV Compact Transmission Line in Chuxiong Area

通过对楚雄地区近年来雷击跳闸及雷电活动情况进行调查分析,针对500 kV紧凑型输电线路发生雷击跳闸与设想的差异情况,对其展开防雷特性研究.重点考察在拆除分支地线前后,紧凑型线路的防雷保护效果变化情况.研究结果表明拆除分支地线前后,紧凑型耐张塔的反击、绕击耐雷水平变化不大,但对绕击跳闸率的影响很大;拆除分支地线后,地线对导线的保护作用削弱,绕击跳闸率增幅约在52％～64％.

According to the investigation and analysis on lightning trip-out and lightning activities in Chuxiong area in recent years, the shielding failure difference of 500 kV compact transmission line between facts and expectation, the lightning protection is studied, especially the influence of bypass shielding wire. The results show that bypass shielding wire has great influence on shielding failure tirp-out rate, but has small influence on counterattack. After the removal of ground wire branches, shielding effect of the ground wire weakens, the data shows that the shielding failure tirp-out rate rise by 52% to 64%.