某35kV配电架空线路防雷保护装置应用研究

Study on the Lightning Protection of 35 kV Transmission and Distribution Line

丘陵地区雷电活动频繁,对35kV架空线路的安全运行危害极大。广东山区某35kV线路频繁遭受雷击,在广泛收集该线路运行情况资料的基础上,分析总结雷害频发原因,提出对线路加装并联保护间隙的防护措施,并对该措施进行可行性分析,设计并联间隙的结构,对间隙试品进行雷电冲击试验,确定间隙两个球极间距离,并计算并联间隙后对线路雷击跳闸率的影响,分析得出并联间隙的加装对线路跳闸率的影响是可以接受的。

Lightning activities are frequent in hilly areas and does great detriment to the safe operation of 35 kV overhead lines. The 35 kV overhead lines in Guangdong is frequently suffered lightning strike. On the basis of collecting extensive materials of the line, this paper analyzes the reason of frequent lightning strike and proposes to use shunt gap as the lightning protection. This paper also analyzes feasibility for the shunt gap measure and designs the structural sizes of shunt gap. Lightning impulse tests are performed to shunt gap test object to find the distance between two balls, calculating the influence on lightning trip-out rate after using shunt gap, and finding that the influence is acceptable.