Analysis of Poynting's Vector around and inside Human Body Erect on Ground under Power Line.

电力线下竖立在地面上的人体周围和内部的坡印廷矢量分析。

基本信息

批准号：
06452203
负责人：
ISAKA Katsuo
金额：
$ 2.24万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

This research was conducted on the calculations and measurements of the Poynting's vector which identifies the flow of power frequency electric energy. The poynting's vector is specified as the vector product of electric field and magnetic field.For time-varying electric and magnetic fields, the instantaneous and time-averaged(effective)values of this vector should be taken into consideration. Theoretically analyzed were the characteristics of those values at a height of 1m above the ground under 500 and 18kV power lines. The associated experiments were performed under a 187 kV 1ine. Furthermore, the interaction of human body with the Poynting's vector has been made clear for the case where the human body is erect on the ground under power line. The results of this research can be summarized as follows :The Poynting's vector were analyzed by using the calculated phasors of electric and magnetic fields from the power lines. For the practical power factors of the load(phase current : 1,000 A), the effective power densities at 1m above the ground were found to be on the order of some kW/m^2. The maximum density appeared beneath the lower conductors of 500 kV or 187 kV vertical, double-circuit lines.The Poynting's vector was observed on the ground under a 187kV line. The sensors of electric and magneti fields were housed in a conducting sphere, where the outputs of the sensors were mutiplied and averaged as to time. The waveform of electric and magnetic fields and the time-averaged value were transmitted through the optical fibers so that those could be observed with an oscilloscope.The Poynting's vector was found to be highly enhanced around the head of the human body in the flow of electric energy. This is because the electric filds of 10kV/m and a magnetic filds of 0.5 G was found to be smaller than an average metabolic rate of humans.

这项研究是针对识别电频率电能流的计算和测量值进行的。 Poynting的向量被指定为电场和磁场的向量乘积。对于时变的电场和磁场，应考虑该矢量的瞬时和时间平均值（有效）值。从理论上分析的是这些值在500和18kV电源线以下1m高度的高度上的特征。相关的实验是在187 kV 1ine下进行的。此外，对于人体在电力线的地面上竖立在地面上的情况下，人体与poynting的向量的相互作用已经明确了。这项研究的结果可以概括如下：通过使用电源线的电气和磁场的计算方法分析了Poynting的向量。对于负载的实际功率因子（阶段电流：1,000 a），发现地面1m处的有效功率密度在某些kW/m^2处。最大密度出现在500 kV或187 kV垂直的双回路线的下方导体下方。电场和磁电场的传感器被安置在传导球中，在该球体中，传感器的输出被搭配并平均。电场和磁场的波形以及时间平均值通过光纤传输，以便可以使用示波器观察到这些纤维。发现Poynting的向量在电能流动中的人体周围围绕人的头部高度增强。这是因为发现10kV/m和0.5 g的磁性FILD小于人类的平均代谢率。