Quantification of ELF electric and magnetic fields in residential areas.

住宅区 ELF 电场和磁场的量化。

基本信息

批准号：
10837012
负责人：
ISAKA Katsuo
金额：
$ 1.98万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10837012/
关键词：
Residential area Electric field Magnetic field ELF Transmission line Distribution line Induced current Harmonics 高用周波数人体モデル体内誘導電流密度

项目摘要

This research was performed in order to quantify the characteristics of extremely low frequency (ELF) electric and magnetic fields in residential areas. The following results are obtained through the research :(1) Two meters (EMDEX MATE and EMDEX II) were used in this research to find the characteristics of non-uniform magnetic fields to which the waist and the breast of a volunteer were exposed. The meters were calibrated using the laboratory-made three-dimensional helmholz-type coil. The measured data have shown that we usually are exposed to non-uniform magnetic fields in residential areas remote from power transmission lines. The data on personal exposure to magnetic fields has been obtained and compared with the data of American people.(2) The induced currents in a human body sitting in front of a video display terminal have been measured using an analog data optical link. The leakage currents from a number of electric appliances to a human body have been measured and compared with the induced currents from a VDT.(3) The harmonics were found in the waveforms of magnetic fields from a distribution line. The effects of harmonics and unbalanced three-phase currents on magnetic fields characteristics have been examined by numerical calculations performed under the condition that 60Hz and 5th harmonic electric currents flow on vertical, horizontal or delta-type distribution lines.(4) It was found that ground-level electric fields under a transmission line were affected not only by the existence of nearby conducting objects but also by the moisture of the ground.(5) The induced currents have been estimated for a human model simultaneously exposed to electric and magnetic fields in consideration of the phase difference of the two fields.

进行这项研究的目的是量化住宅区极低频（ELF）电场和磁场的特征。通过研究得到以下结果：(1)本研究使用两米仪(EMDEX MATE和EMDEX II)来发现志愿者腰部和胸部所暴露的非均匀磁场特征。这些仪表使用实验室制造的三维亥姆霍兹型线圈进行校准。测量数据表明，我们通常暴露在远离输电线路的住宅区的不均匀磁场中。获得了个人暴露于磁场的数据，并与美国人的数据进行了比较。(2)使用模拟数据光链路测量了坐在视频显示终端前的人体中的感应电流。测量了多种电器对人体的漏电流，并将其与 VDT 的感应电流进行了比较。(3) 在配电线路的磁场波形中发现了谐波。通过在垂直、水平或三角形配电线路上流过60Hz和5次谐波电流的条件下进行的数值计算，检验了谐波和三相不平衡电流对磁场特性的影响。(4)传输线下方的地面电场不仅受到附近导电物体存在的影响，而且还受到地面湿度的影响。(5) 对同时暴露在电场和磁场中的人体模型的感应电流进行了估计。考虑相位差两个字段的。