交流输电线路附近民房平台处工频电场限值研究

Study on Limits of Power Frequency Electric Field on House Platform Near AC Transmission Lines

在进行输变电工程临近房屋的电磁环境影响评价时,经常出现要求测量房顶平台的工频电场,并按4 k V/m进行评价的主张。针对此类有测量方法但无限值依据的情况,开展不同工频电场下的直接感受和暂态电击感受(包括对地绝缘的人触摸良好接地金属体、良好接地的人触摸对地绝缘的金属体)的试验。在综合考虑人体在工频电场下的直接感受和可能出现的暂态电击后,建议对于居民不必经常活动的屋顶平台,距平台底面1.5 m处的工频电场控制值取7 k V/m;对于居民日常活动区域的平台,建议工频电场控制值与一楼地面的相同,即距平台(包含阳台)底面1.5 m处的工频电场控制值取4 kV/m。

During the evaluation of electromagnetic environment for high voltage power transmission projects nearby houses, the measurement of power frequency electric field on the house platform and be limited to 4 kV/m was often required. For this situation that the methods of measurement exist but no reference limit value, the experiments of human body direct feeling and transient shocks feeling which including insulated person touching the grounded metal and grounded person touching the insulated metal under different power frequency electric field values were conducted： Considering the direct feeling and possible transient shocks of human body under power frequency electric field, the limit of 7 kV/m at 1.5 m high from the bottom of the house platform where the residents didn＇t appear frequently was proposed. And the limit of 4 kV/m at 1.5 m high from the bottom of the house platform （include house balcony） where the residents appear frequently was also proposed, which is the same with the limit at the ground of first floor.