应用矩量法的变电站内工频电磁场计算及实测

首先介绍矩量法的计算原理,推导相应的计算公式,然后利用该方法对佛山市110 kV桂城变电站110 kV配电区的电磁环境做了相应的计算,并与现场实测结果进行对比,结果表明,该方法能够准确计算变电站内电磁场。接着给出了佛山地区其他110~500 kV变电站现场测量数据,有的变电站内部分区域的工频电场强度和磁感应强度超过其限值。为此,分析变电站内架空线路高度、间距、线径和大地电阻率对电磁场分布的影响,以供相关人士参考。

Calculation of Power Frequency Electromagnetic Field Within Substation by Moment Method and Actual Measured Results

At first,the principle of moment method is presented,and corresponding calculation formula are derived;then using this method the electromagnetic environment within 110kV distribution area in the 110kV Guicheng substation located in Foshan,Guangdong province is calculated,and calculation results are compared with actual measured results.Comparison results show that the proposed method can compute electromagnetic field with substation.The on-site measured data of electromagnetic fields within substations in voltage classes from 110kV to 500kV in Foshan region are given,and measured data show that power frequency electric field strengths and magnetic flux densities in partial areas within some substations exceed specified limits.For this reason,the impacts of the heights,spacings and conductor diameters of overhead transmission lines and the earth-resistivity on the distribution of electromagnetic fields are analyzed.