220kV输电线路近区建筑物工频电场抑制措施

Control of Power Frequency Electric Field near Building Close to 220 kV Transmission Line

针对高压输电线引起工频电场污染对近区高层建筑产生的影响,研究了抑制工频电场的措施方案。以某220kV高压线跨越建筑物段为例,首先对分别采用架设屏蔽线、屏蔽网以及房屋阳台处架设屏蔽网兼做防盗网的3种措施后的地面1.5m高处的电场强度分布,以及房屋外沿(尤其是阳台或走廊)的场强分布进行有限元法仿真计算分析。仿真结果表明:这些措施都能减小高压线近区建筑的电场强度。然后通过模拟实验验证仿真的有效性,进而对比3种措施屏蔽效果、优缺点及适用范围。最后得出抑制工频电场相对较好的方案,即民居高层阳台处架设屏蔽网兼做防盗网,其屏蔽效果降低至原来的7.4%～59.9%,效果优于屏蔽线,次于屏蔽网,但其工程易于实现,维护方便,是一种较好的选择方案。

For the pollution of frequency electric field on the high-rise building caused by the nearby high voltage transmission line,the measures scheme to limit the power frequency electric field value was analyzed.In this paper,with a 220 kV high voltage line across the building section as an example,firstly,this paper adopts 3 kinds of measures,including erecting shielding wire,shielding net,and houses balcony place erected shielding net that also can be regarded as network security.Then by the simulation of electric field to analysis electric field intensity distribution on the ground 1.5 m high and the outer edge of the building（especially the balcony or corridor）.Simulation results show that： these measures can reduce the high-voltage electric field strength near the building.Secondly,simulation experiment was used to verify the validity of simulation,then by comparing the shielding effect of three kinds of measures,advantages,disadvantages and application.Finally,inhibition of power frequency electric field obtained relatively good effect that is erecting shielding network holds concurrently do network security in residential high-rise balcony.The shielding effect reduced to the original 7.4% ~ 59.9%,better than the shield,behind shielded net.But the project is easy to implement,easy to maintain,which makes it a better option.