表面电荷法在复杂地势下超高压输电线路的工频电场计算

为了更准确地研究超高压输电线路穿越较复杂地区时的工频电场,利用表面电荷法的思想,给出了该方法的实施步骤并进行了验证。综合考虑了输电线路的弧垂,建立了复杂地势三角坡和凸面的三维模型,并仿真分析了其周围工频电场的分布。研究结果表明:1三角坡和凸面对输电线路下的工频电场影响较明显;2随着三角坡坡角的增大场强值畸变越大,且使临近三角坡坡脚处场强值减少越大;3不同的输电线排列方式下,复杂地势周围的工频电场畸变不同,倒三角排列下其值畸变大于其他排列。该仿真结果可为复杂地势下输电线路的架设提供参考依据。

Power-frequency electric field calculation of extra high voltage transmission line based on surface charge simulation method under complex landscape

In order to more precisely research the power frequency electric field generated by the EHV transmission line under complex landscape,the concept of surface charge simulation method is used.The implementation steps of the proposed method are given and verified.The sags of the transmission line is considered,a three dimensional electric field model is established by using this method and the distribution of the electric field of 500kV transmission line is analyzed under the triangle slop and convex surface.Analysis results show that:① the influence of the triangle slope and convex ramp on power frequency electric field is rather obvious,② the field distortion increases as the increase of the triangle slope and the reduction of electric field becomes more severe near the toe of the triangle slope,and ③the transmission line with different pin-fin arrays has significant effect on the power frequency electric field of the complex landscape.Results from the proposed modeling method are available for reference to the design of UHV transmission line when it passes through the complex landscape.