屏蔽线降低220kV输电线路附近民居超标工频电场的效果分析

Effect Analysis on Reducing the Excessive Power Frequency Electric Field Near Buildings Close to Transmission Line of 220 kV by Using Shielding Conductors

笔者针对高压输电线路近区的建筑物空旷处超标工频电场,研究减弱工频电场的方案。以一条220 kV输电线路以及其近区高层建筑物为例,研究架设阳台处屏蔽线的屏蔽效果。文中首先通过实地测量和仿真分析高压输电线路近区的建筑物处电场污染情况。然后构建阳台处屏蔽线的模型,通过仿真软件分析改变屏蔽线的丝径、间隙;屏蔽线与阳台的水平、竖直距离;屏蔽线的封闭完整度对于屏蔽效果的影响。研究表明,在架设阳台处屏蔽线可有效地降低阳台处的工频电场,能够将电场下降到原先的30%以下。同时,采用丝径越大、间隙越小、离阳台边缘水平距离和竖直距离越远并且封闭架设的屏蔽线,其屏蔽效果越优。

This paper is about studying on reducing the power frequency electric field producing by the high tension transmission line near the buildings open field. Using a 220 kV high level line and the high building near it,the paper studies on the shielding effect of setting up balcony shielded wire. First,this paper surveys the electric pollution of the building near the high tension transmission line by site investigation and simulation analysis. Then,after making the balcony shielded wire model by simulation software,this paper analyses the influence of shielding effect when changing wire diameter and clearance of shielded wire,horizontal distance and vertical distance of the shielded wire with balcony and integrity of the shielded wire. Studies have shown that setting up balcony shielded wire can effectively reduce the power frequency electric field of balcony ,which dropped to less than 30% of the original. At the same time ,using of the integrated shielded wire which has greater wire diameter, smaller clearance, farther from the balcony edge of the horizontal distance and vertical distance works best.