特高压直流输电线路档距内电场三维仿真模拟

3-D Simulation of Electric Fields across the Span of UHVDC Transmission Lines

传统的二维模型不能正确反映特高压直流输电线路档距内考虑弧垂和跨越建筑物等因素时的电场分布,因此,本文采用镜像法计算标称场强,结合悬链线方程,给出特高压直流输电线路电场三维仿真计算解析法的详细步骤,并采用该算法研究了考虑弧垂以及存在建筑物时输电线路档距内的三维电场分布。无建筑物时,线路正负极导线下方场强最大值出现在弧垂最大处,随着远离弧垂最大点,场强沿着纵向和横向逐渐衰减。存在建筑物时,建筑物房顶尖角处的场强将发生畸变。因而,在评价跨越建筑物的特高压直流输电线路对环境的影响时,必须考虑建筑物对场强的畸变影响。

Since the traditional 2-D model can not correctly reflect the electric field distribution under UHVDC transmission lines while considering transmission lines sag and buildings constructed beneath the lines, the 3-D mathematic model is presented which is composed of catenary equation. The 3-D model was used to simulate the electric field, and the results are given. The electric field is unevenly distributed across the span, which means the effect of the sag of conductor can not be neglected. Compared with the no-building situation, the electric field distribution is more complicated with aberration points. The proposed method is effective in the 3-D electric field simulation, which may be helpful to the design of UHVDC transmission lines.