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In urban power grids, the proportion of cross-linked polyethylene (XLPE) power cable continues to increase. Judging the insulation condition of XLPE cable precisely is of great significance. In this paper, a number of cable samples are thermally accelerated aged at different temperatures and during various periods. Polarization/depolarization current (PDC) and frequency-domain dielectric spectroscopy...
Since a few years, non-destructive techniques for assessment of power transformer insulation systems have been developed. The dielectric response in time and frequency domain is studied to determine the oil/paper insulation condition. One of the important parameters affecting the dielectric response is the temperature. On real transformer, the temperature of measurement is not controlled and is usually...
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