摘要
为解决500 kV输电线路2根避雷线减小保护角或采用负保护角时,可能出现雷电绕击中相导线的问题,提出了负保护角下采用3根避雷线的保护方案,并针对不同杆塔塔形进行了理论计算。结果表明,采用3根避雷线不仅提高了防绕击性能,而且加强了避雷线的分流和耦合作用,降低了反击的可能性。
In order to solve the problem of lightning strike on middle phase conductor when two overhead ground wires of 500 kV transmission line reduced the protection angle or adopt negative protection angle, this paper presents a protection scheme of three overhead ground wires under negative protection angle, and makes theoretical calculations for different transmission tower. The results show that the use of three overhead ground wires on 500 kV transmission lines, not only improves the performance of lightning protection, but also strengthens the diversion of overhead ground wires. And the coupling effect reduces the possibility of counterattack.
引文
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