摘要
近年来，用于山区杆塔的负角保护针使用日益广泛，其防雷有效性急需论证。本文针对该措施的安装特点，基于三维电气几何模型，得到了适用于负角保护针防雷分析的跳闸率计算方法。以典型220kV双回输电线路直线塔为研究对象，对负角保护针在不同长度、安装位置、安装角度和地形下的防雷有效性进行了计算。推荐负角保护针安装在杆塔中相横担支架处，且水平放置；安装负角保护针降低绕击跳闸率的效果约为8％，结合降低接地电阻，杆塔跳闸率能降低约14％-21％。
The effectiveness of lightning protection of negative angle protective rod for the mountain tower needs argument.In this paper,the calcuG lation method of lightning stroke trip rate for this rod has been proposed by three dimensional electric geometry model.To the typical 220 kV double cirG cuit transmission line,the effectiveness of lightning protection under different lengths,positions,angles and topographies of the rod installation have been computed and compared.The best installation position of the rod is the middle phase of transverse in horizontal angle.The shielding failure trip-out rate can be depressed about 8% by this rod.The total trip-out rate can be further depressed about 14%~21% by reducing the grounding resistG ance.
出处
《科学中国人》
2014年第10S期98-100,共3页
Scientific Chinese
关键词
负角保护针
电气几何模型
绕击跳闸率
反击跳闸率
negative angle protective rod
electric geometry model
shielding failure trip-out rate
counterattack trip-out rate
