架空输电线路防绕击避雷针防护效果试验研究

为了研究在地线上加装防绕击避雷针的可行性和安装原则,以贵州500 kV输电线路为研究对象,通过对1:25缩小的输电线路典型杆塔模型进行雷电绕击模拟试验,研究防绕击避雷针长度以及安装位置与防绕击效果的关系,为防绕击避雷针在500 kV的应用上提供科学依据。试验结果表明:在架空地线上合理布置防绕击避雷针,对雷电绕击导线具有较好的防止效果,防绕击避雷针长度以及位置对绕击率影响较大,建议防绕击避雷针安装在距杆塔10～50 m区域,并提出了针间距应满足的公式。

Research on Protective Effect of Lightning Rod with the Protection of Shielding Failure for Overhead Power Transmission Lines

In order to study the feasibility and installation guidelines about lightning rod with the protection of shielding failure around the overhead ground wire,using the 500 kV transmission lines as examples,a model of reducing transmission line typical tower is established to simulate the shielding failure,the effects of the length and position of lightning rod with the protection of shielding failure on the protective effect are analyzed to provide a scientific basis for the application of lightning rod with the protection of shielding failure of 500 kV transmission lines.The experimental results reveal that,the rational arrangement of lightning rod with the protection of shielding failure around the overhead ground wire to better prevent from hitting the overhead ground,and the length and position of lightning rod with the protection of shielding failure have influence on the shielding failure rate.At last,the lightning rod with the protection of shielding failure is proposed to installed in the away from the tower the region of 10~50 m,and the formula for pin spacing is proposed.