220kV变电站工频电场的仿真分析

Simulation analysis of power frequency electric field in 220kV substation

近年来随着我国电网的飞速发展,电磁环境问题引起了社会的广泛关注,特别是变电站的工频电场问题越来越受到人们的重视。文章基于模拟电荷法提出了一种简化的算法,通过对变电站进行整体建模,仿真计算离地1.5m处的电场分布。通过与CDEGS软件仿真结果及现场实测数据的比较,验证了该算法的正确性。最后对某220k V变电站进行计算分析,讨论了设备高度、进出线相间距和相序排列对变电站工频电场分布影响,结果表明提高导线对地高度、减小相间距、合理的线路相序排列都能降低变电站内的电场强度,为变电站工频电场强度的分析与设计提供了参考。

The electromagnetic environment has been brought into public focus with the rapid development of national power grid in recent years, especially power frequency electric field in substation attracts more and more attention.A simplified algorithm based on charge simulation method is proposed in this paper to calculate the entire electric field distribution at the height of 1.5m.And the calculate results are proved to be valid by comparing the simulation results of the CDEGS and the measured data on the spot.Furthermore, the electric field distribution in the 220kV switchyard in substation is calculated, and three influencing factors including the equipment height, the inlet and outlet line space, and the phase sequence arrangement are studied.The result shows that improving the conductor to ground height, decreasing the phase space and reasonable phase sequence arrangement can reduce the electric field intensity in the substation, which provides the reference for analysis and design of power frequency electric field intensity in substation.