500kV超高压变电站整体工频电场仿真计算与测量分析

Analysis of power frequency electromagnetic field in 500kV substation during fault status

首先介绍了改进的模拟电荷法,通过对重庆市陈家桥500k V变电站模型的建立,计算分析了整个变电站内离地1.5m处的工频电场,同时对站内500k V开关场区域、220k V开关场区域和其他站内重要区域的路径、设备等进行了仿真计算分析。结果表明,本文算法与变电站实际测量值吻合良好,校验了算法的正确性。变电站内绝大部分工频电场都位于工频电磁场安全防护等级Ⅰ。本文算法为快速分析超高压变电站站内工频电场分布情况提供了有效方法,同时能够预测其他变电站内的工频电场强度及避免站内职员暴露在电场强度超标区域。

This paper presents an improved charge simulation method（ CSM） to calculate and analyze the power frequency electric fields at 1. 5m over the ground by modeling the 500 k V substation in Chenjiaqiao,Chongqing. In addition,the paper also implements simulation of electric field in switchyard area in 500 k V and 220 k V substations,together with paths and equipment in critical areas within the substations. The simulation results are proved to be basically consistent with the measured results,which verifies the effectiveness of the improved CSM. The results also reveal that the majority values of power frequency electric-field intensity within the substation meet the standard limits. The proposed approach provides an effective way to calculate the distribution of power frequency electric field in EHV substation. Meanwhile,it is also able to predict electric field in other substations and consequently provide suggestions to let staffs to avoid exposing to those areas where the electric-field intensity exceeds standard limits.