500kV变电站工频电场人体内感应电流的计算分析

Calculation of induced ccurrent densities in human body by power frequency electric fields from 500 kV substation

对超高压变电站工频电场在人体内的感应电流分布进行了研究。根据500 k V变电站内离地1.5 m处的工频电场分布,采用基于有限积分法的频率缩放法计算人体曝露于变电站工频电场时体内的感应电流分布。研究了变电站内三相合成电场的极化特性,计算了线极化、圆极化和椭圆极化三种极化电场下人体内感应电流,考虑了电场不同的入射方向。研究表明,当人体曝露于变电站内电场强度最大区域的线极化工频电场中时,人体内感应电流不超出ICNIRP职业曝露基本限值;当工频圆极化和工频椭圆极化电场矢量包含垂直于地面的分量时,人体内感应电流较强;人体内感应电流最大值出现在骨髓之中,其中椭圆极化电场下的感应电流最大值最大,已经接近人体受工频电场影响的阙值,需引起注意。

In order to realize the distribution of induced currents in human body by power frequency electric fields from extra high voltage substations the study is researched. It calculates the induced current densities in human body by power frequency electric field distributions in a 500 k V substation via frequency scaling approach based on finite integration technique. Afterwards,infers the basic characteristics of three- phase composite electric fields of the substation,calculates the induced current densities in human body by linearly polarized,circularly polarized and elliptically polarized electric fields,and different incidence directions of the electric fileds are taken into account. The result indicates that the induced current densities in human body dosen,t exceed the basic restriction by ICNIRP when power frequency electric fields of the substation is maximum and linearly polarized.When the incident circularly polarized and elliptically polarized electric fields contain perpendicular components,the induced current densities will be higher. The maximum value appears in marrow,which is close to ICNIRP basic restriction.