Abstract
The applicability of polyethylene polymerized using a metallocene catalyst as an insulation material for DC XLPE cables has been investigated. The space charge distribution was examined using the pulsed electroacoustic technique over a temperature range from room temperature to 90°C. Hetero-charge was observed near the surface of the sample at higher temperatures. Hetero-space charge, produced by ionization derived from activation of an antioxidant added to the sample, either increased or decreased with increasing temperature of the sample. A hetero-charge absorber was added to control the hetero-space charge. As a result, hetero-charge was not observed in the sample under a high electric field for temperatures extending from room temperature to high temperatures and the DC breakdown strength at 90°C was increased. It was confirmed that the volume resistivity of the sample increased at high temperature.
Published Version
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