考虑线路走廊环境的35kV配电网避雷器优化配置研究

Optimal Configurations of Surge Arresters of 35kV Distribution Lines with Different Line Corridors Environment

雷电过电压是造成配电网事故的主要因素,目前安装避雷器是配电线路防雷的重要手段。采用蒙塔卡罗法来模拟雷电过程,结合电力仿真软件ATP/EMTP对某35kV配电网线路避雷器的优化配置进行研究,重点考虑了不同接地电阻以及线路走廊情况下,不同的避雷器配置对防雷效果的影响。结果表明,线路走廊有树木时,可较大的降低雷电直击线路的概率,减少雷电闪络,但较高的树木也使得感应雷闪络概率升高。杆塔的接地电阻对避雷器防雷效果有较大的影响,应尽量减少接地电阻。

Lightning overvoltage is the main factor causing the accident of distribution grid, surge arrester is the main way to protect the line. The process of lightning is simulated by using Monte Carlo method, and combined with power simulation software ATP/EMTP, optimization configuration of 35kV distribution grid line arrester is studied, the influence of different configuration of surge arrester on lightning protection effect under different grounding resistance and line corridors is mainly considered.The results show that, when line corridors with trees, the probability of lightning directly attacking line can be reduced largely, which reduce the lightning flashover, but High trees also cause the higher induction lightning flashover probability. Tower grounding resistance has great influence on arrester lightning protection effect, which should be try to reduced.