500kV输变电线周边工频电磁场强度调查

Investigation of the power frequency of the electromagnetic field intensity around the 500kv-power transmission line

目的了解丘陵地区500kV输变电线路工频电磁场强度分布状况。方法对边导线一侧20m范围内工频电场强度、工频磁场强度进行测量。结果距边导线垂直投影线0、5、10、15、20m处工频电场总场强度〉4kV/m分别占点次数的21.1%、18.4%、21.1%、12.4%、7.1%;工频磁场总场强度均〈0.1mT。结论不同线高的工频电磁场垂直分量的分布不全相同。应将线高列为工频电磁场检测参数之一。

Objective To understand the power frequency of the electromagnetic field intensity distribution of the 500 kV transmission line in the hilly areas.Methods The frequency of the electric field intensity and the frequency of the magnetic field strength at one side of the wire within 20 m were measured.Results The monitor points were at 0,5,10,15,20 m from the side of the wire in vertical projection.The total field strength which were stronger than 4 kV/m were 21.1%,18.4%,21.1%,12.4%,7.1% respectively.The strength of the total frequency magnetic field was less than 0.1 mT.Conclusions The power frequency of the electromagnetic-field＇s vertical strength distribution at different heights was different.Suggestion：The height of the line should be considered as a test parameter for measuring the frequency of the electromagnetic-field＇s strength.