低密度ポリエチレンフィルムの交流高電界下における損失電流波形解析

概要

論文の詳細を見る
Nonpolar polymers, such as Polyethylene and Polypropylene, are widely used as the insulator for power cable and power capacitor. To design the insulating part for these apparatus under further higher ac field, it is very important to study the ac conduction mechanism under actual running ac high field. Also, it is important for aging diagnosis and considering the aging process. Recently, we have developed the unique system which make possible to observe the dissipation current with wide band range. In this system, to observe the nonlinear properties of dissipation current, capacitive current is automatically cancelled by using anti capacitive current signal. In this paper, we will discuss the charge behaviour, specially, space charge effect under ac high field. The dissipation current waveforms observations are carried out under various frequencies with different thick LDPE films. As the results of these experiments, at 15 kV/mm and over 140 Hz, 4 peaks for one cycle s dissipation current are observed. Also, it is found that 2^<nd> and 4^<th> peaks show a thickness dependency, even though 1^<st> and 3^<rd> peaks value has no thickness dependency.
沼津工業高等専門学校の論文
2005-01-31