UHV交变电场在人体中感应电流计算分析

为研究1000 kV特高压(UHV)架空线路工频电磁场对人体健康及环境的影响,计算了人体位于UHV线路下方时,交变电场在人体内的感应电流及其影响因素和线路最小对地高度。探讨了设计规程中高压线路最小对地高度应保证线路下方距地1m高处的电场强度<10kV/m的合理性。结果表明,人体的电导率和介电常数的大小对工频电场在人体内感应电流密度的大小并无明显影响;按照线路下方距地1m高处的最大电场强度<10kV/m的原则来确定UHV线路的最小对地高度,感应电流密度不会超过安全值。

Calculation of Electric Field Induced Currents on Human Bodys Under 1000kV UHV

More and more attention is paying to the potential health and environmental effects of 1000kV Ultra-high voltage(UHV) overhead lines.The AC electric and magnetic field will induce currents on human bodies,and the currents cause harmful effects as the current density exceeds a given limit.How to specify the lowest height of the 1000kV overhead lines is the important aspects which have to be concerned at the design stage.According general criterion,the maximum electric field intensity at the point 1m high above ground can not be more than 10kV/m.As to UHV lines,the justification of this criterion need to be studied further.In this paper,effects of ultra-high voltage overhead lines electric field on human body standing under UHV lines are studied,the distribution of induced current density and the electric field intensity around human body are calculated.The parameters,such as conductivity and permittivity which affect the induced current are analyzed,the minimum safe height of 1000kV ultra-high voltage overhead lines is studied.The calculation results show that influence of conductance and permittivity of human body on the induced current is ignorable,and,the standards which is used to specify the lowest height of 500kV overhead lines is still available to the 1000kV ultra-high voltage overhead lines,that is to keep maximum the electric field intensity lower than 10kV/m at the 1 meter height above ground.