無極性高分子フィルムの高電界交流損失電流波形の過渡応答

概要

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To study the high-field AC conduction mechanisms of nonpolar polymers, the AC dissipation current waveforms are observed. The shapes of the AC dissipation current waveforms in the high-field and high-temperature region become the triangle one in spite of the sinusoidal voltage application, suggesting the nonlinear electrid field dependence of instantaneous AC conductivity. The fast rising AC ramp voltage application method is developed as the new technique to examine the dielectric properties in the very short time range. This method enables the measurement of the variations of the high-field dielectric properities and the dissipation current waveform immediately after the voltage application. The new measurements were carried out on electron beam (EB) irradiated crosslinked polyethylene (IR-XLPE) film and polypropylene (BOPP) film. The dissipation current waveforms in high-temperature region show the peak in the formaer part of each half cycle and quick decrease in the latter part of each half cycle of a full waveform, which seems to show that the carrier injection from the electrode is assisted by the hetero space charge in the region near the electrode.
沼津工業高等専門学校の論文
1995-01-31