High-field dissipation current waveforms in e-beam irradiated XLPE film superposed by DC ramp voltage

Abstract

In order to investigate the influence of crosslinking on high field dielectric properties of polyethylene, the observations of AC dissipation current waveforms of electron beam (EB) irradiated crosslinked polyethylene (IR-XLPE) films at 90/spl deg/C were carried out by using the samples with different gel fractions. The dielectric property at 90/spl deg/C depends not only on the gel fraction but also on the position of film from EB irradiation side. It might be indicated that the mobile carrier in high temperature region is strongly affected by electric field, temperature and the gel fraction of IR-XLPE film. AC dissipation current waveforms under the superposition of AC and DC electric field were observed by using IR-XLPE films with different gel fractions. The dissipation current waveforms of the 20th, 30th and 40th samples from the electron beam irradiation side were strongly affected by the DC component of applied voltage, namely its polarity and magnitude.