Abstract
Generation of space charges in polymeric dielectric materials is known to be affected by such inclusions as cross-linking byproducts, antioxidants and moisture. Authors reported previously that the negative heterocharges in XLPE are generated under the existence of acetophenone and sulfur-containing antioxidants. In this research the authors performed further experiments using samples containing DCP and three kinds of antioxidants to examine the mechanism. Negative heterocharges near the positive electrode were detected in samples containing both DCP and the antioxidants when those samples were soaked in acetophenone. The negative heterocharges were not detected in samples containing either DCP or the antioxidant, even when the sample was soaked in acetophenone. These results demonstrate that the heterocharge is generated by the combined effect between acetophenone and substance produced by interaction between DCP and antioxidant. Considering results of experiments measuring the amount of heterocharges in samples that had been heat-pressed at different temperatures, the mechanism of negative heterocharge generation in polymeric dielectric material is inferred.
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