磁束密度の不平等性が単媒質生体モデル内の誘導電界に及ぼす影響

抄録

The present contribution demonstrates how the magnitudes and phase angles of the induced electric field in human model placed in the real non-uniform magnetic field differ from those in the ambient magnetic field supposed to be uniform. In the numerical calculation, a simple elliptical human model made of homogeneous substance is employed and so-called "Impedance Method" is used to analyze the induced electric field in the human model.
Examination of the results obtained for the single line shows that the magnitude of the induced electric field in the model will be in general under-estimated if the real non-uniform magnetic field would be supposed to be uniform. It is indicated that, under such a magnetic environment, the difference in the magnitude of the induced electric fields (δ_E) is almost directly proportional to the degree of the magnetic field non-uniformity (δ_B), and δ_E is always smaller than δ_B; i.e. the induced electric field strength is insensitive to the nonuniformity of the ambient magnetic field strength. As long as the magnitude of the induced electric field is concerned, almost the same conclusion as in the case of the single conductor can be drawn for the magnetic field environment appearing under the EHV and UHV transmission lines. In such an environment both the magnitude and phase angle of the magneflc field spatially vary. It is found that relationship between δ_B and δ_E is almost independent of the layout and geometrical configuration, and the line voltage of the transmission lines investigated. On the other hand the differences in the phase angles of the induced electric fields are found to be equal or greater than those of the external magnetic fields, depending on the field component to be concerned. It is consequently concluded that the phase angle of the induced electric field is much more sensitive to the non-uniformity of the ambient magnetic field than its magnitude.