500 kV双回输电线路转角塔附近屋顶畸变电场分析

The distorted electric field on rooftop near angle tower of 500 kV double circuit transmission lines

同塔双回输电线路转角塔附近的民房屋顶空间工频电场畸变严重,是制约输变电工程规划、设计和环保评价的重要因素。文中建立了500kV双回输电线路转角塔附近空间工频电场的仿真模型,通过仿真计算与实测数据对比验证了模型的有效性,分析了影响屋顶电场畸变的因素,并按电场曝露限值标准推算房屋距线路的安全距离。研究表明,房屋距离线路的三维距离越近,电场越集中,房屋屋顶的曝露场强畸变越严重。房屋高度对电场的影响随距离增大而减小。最后给出了不同线路转角情况下转角塔附近不同高度房屋的安全距离,可为500kV双回输电线路的工程规划、设计和环境影响评价提供参考。

Power frequency electric field near the angle tower of double circuit transmission lines is seriously distorted,which becomes an important factor restricting the engineering design and environmental assessment of the transmission lines.This paper establishes a model for the simulation of power frequency electric field near the angle tower of 500 kV double circuit transmission lines.The validity of the model is verified by the comparison between simulation results and measured data.The distortion factors affecting the electric field on the rooftop are analyzed.Based on the electric field exposure limit,necessary control distance between the house and the transmission line is estimated.The results show that the closer the three-dimensional distance between the house and the line is,the more concentrated the electric field is and the more serious the distortion of the exposed field on the rooftop of the house is.The influence of house height on electric field decreases with distance increasing.Finally,the control distance between the houses and the lines under different house heights and turning angles is suggested,which could be referred in the planning and design of transmission lines.