山区500kV输电线路雷电屏蔽性能模型试验研究

雷害是影响500 kV输电线路安全稳定运行的主要因素之一,其中雷电屏蔽失效引起的跳闸占很大比例。特别在山区,雷电屏蔽失效引起的线路跳闸问题显得更为突出。为了深入研究超高压输电线路的雷电屏蔽性能,此次进行的山区输电线路绕击模型试验,考虑了斜山坡坡度、跨越山涧杆塔、非垂直落雷等因素的影响。试验结果表明,由于山区地形的影响,绕击率远高于平原地区。

Small-scale Model Experimental Study on Lightning Shielding Performance of 500 kV Transmission Lines in Moutain Area

Lightning is one of the main reasons that threaten the safty and stablity of 500 kV transmission lines,where the line trip due to lightning shielding failure occurs very frequently.This problem is especially serious in moutain areas.This paper presents the small-scale model experimental results of lightning shielding performance of transmission lines in mountain areas,for further study of the lightning shielding performance of UHV transmission lines.The experiments in this paper are carried out with such factors as the gradient of the hillside,the depth of the valley,and the non-vertical leader.The experimental results show that the risk of shielding failure of UHV transmission lines is much higher in mountain areas than in plain areas.