三相线电极工频电场强度仿真方法研究

Simulation of Power-frequency Electric Field Intensity of Three-phase Line Electrode

以变电站断路器与隔离开关连接线为例,建立了三相水平连接线工频电场强度数学模型,基于模拟电荷-矩量法对距离地面1.5m高处平面内的工频电场强度进行仿真计算,得出地面附近的电场强度主要由竖直方向分量决定,其分布特点与无限长三相线的电场强度类似;导线间距及导线距地面高度不同,电场强度也会发生变化的结论。为此,提出了导线安装设计建议,即考虑电极间的电场强度,适当增加导线架设高度。

A power-frequency electric field strength mathematical model of three-phase horizontal connecting wire 1s established with substation circuit breakers and isolation switch connecting wire for example. The power-frequency electric field strength in the plane 1.5 m above the ground is simulated and calculated based on charge simulation-moment method, It is concluded that the electric field strength near the ground is mainly governed by vertical component, whose distribution characteristics are similar to the electric field strength of infinite three-phase line; electric field strength varies with wire spacing and the wire height above the ground. Suggestions on the installation and design of conductors are put forth, i.e. taking the inter-electrode electric field intensity into account and elevating conductors properly.