500 kV同塔四回路生态环境影响分析

分析了500 kV同塔4回路传输线的电磁场及其对生态环境的影响。首先分析了传统的等效电荷法及其缺点，在此基础上构建了500 kV同塔4回路传输线电磁场的二维有限元模型，利用该模型可准确分析500 kV同塔4回路传输线周围的电磁场强度。针对2种常见的同塔4回路塔型(垂直塔和水平塔)，分别选取4种相序排列加以分析。分析结果表明，500 kV同塔4回路全相序逆排列能明显降低其电磁场对生态环境的影响，分析结果为传输线路的规划和设计提供了参考。

Analysis on Impact of 500 kV Transmission Line Adopting Four Circuit on the Same Tower on Ecological Environment

The electromagnetic field of 500 kV transmission line adopting four circuits on the same tower and its impact on ecological environment are researched in this paper.Firstly,the defect of traditional equivalent charge method is pointed out and on this basis a two-dimensional finite-element model for electromagnetic field of 500kV transmission line adopting four circuits on the same tower is constructed by which the strength of electromagnetic field around this transmission line can be accurately analyzed.According to two frequent types of towers for transmission line adopting four circuits on the same tower,i.e.,the tower with horizontal conductor arrangement and that with vertical conductor arrangement,four kinds of phase-sequence arrangements are selected to analyze for each type of tower respectively.Analysis results show that as for 500kV transmission line adopting four circuits on the same tower,the whole phase-sequence inverse arrangement of conductors can reduce the impact of electromagnetic field on ecological environment and this conclusion is available for reference to the planning and design of UHV transmission lines.