同塔并架4回输电线路相导线排列方式研究

Research on Phase Conductors Configuration of Parallel Four-circuit Transmission Lines on the Same Tower

为研究相导线的排列方式,利用二维静电场有限元模型计算了500 kV同塔并架4回输电线路导线表面和线下距离地面1 m处电场强度,讨论了模型内、外边界长度的选取,对比几种典型相导线排列方式时导线最大平均场强、线路下地面上1 m处最大场强和线路走廊宽度的结果表明,相导线完全逆序不对称排列的方式较好。

The electric field intensity on the surface of conductors and at the level of 1 m over ground of a 500 kV parallel four-circuit transmission line is calculated with a two-dimensional electrostatic finite element model, and the results is applied in the research on phase conductors configuration. To improve the precision of calculation results, exterior and interior boundary length of the model is discussed. Several typical phase conductors configurations are considered, and the maximum average EFI on the surface of phase conductors, the maximum EFI at the level of 1 m over the ground and corridor width is compared. It is found that inverse and unsymmetrical configuration of phase conductor is a better one.