提高输电线路耐雷水平的关键因素影响分析

Influence of Key Factors on Improving the Lightning Resistance Level of Transmission Lines

输电线路是电力系统的重要组成部分,承载着由偏远能源基地向负荷中心输送电能的重任。输电线路的送电距离可达200 km以上,沿途地势地形、气候环境复杂多变,极易遭到雷击。如何提高输电线路的耐雷水平,降低雷击跳闸率是目前亟待解决的问题。本研究以330 kV同塔双回输电线路为例,分析了冲击接地电阻、耦合地线和避雷器配置方式等关键因素对输电线路耐雷水平的影响。研究结果有助于指导防雷方案设计,对提高输电线路的耐雷水平具有一定的参考价值。

Transmission lines are an important part of the power system,transmitting electricity from remote energy bases to load centers.The transmission distance of transmission line can reach more than 200 km,and the terrain,climate and environment along the way are complex and changeable,making it easy to be struck by lightning.How to improve the lightning resistance level of transmission lines and reduce the trip rate of lightning strikes is an urgent problem to be solved.Taking 330 kV doublecircuit transmission line on the same tower as an example,the author analyzes the influence of key factors such as impulse grounding resistance,coupling grounding and arrester configuration on the lightning resistance level of the transmission line.The research results are helpful to guide the design of lightning protection scheme,and have certain reference value for improving the lightning resistance level of transmission lines.