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Under DC voltage stress, a negative hetero-charge is generated near the positive electrode in cables insulated with cross-linked polyethylene (XLPE). The generation of negative hetero-charges in XLPE-insulated cable results from cross-linking byproducts, antioxidants, and moisture. Among these inclusions, moisture is known to originate from dehydration of a-methyl styrene, which is a byproduct produced...
Charge generation in cross-linked polyethylene (XLPE) and ethylene propylene rubber (EPR) under dc stress are influenced strongly by inclusions. The inclusions influencing charge generation are cross-linking byproducts, antioxidants, and moisture. These inclusions particularly influence the generation of negative heterocharges observed near positive electrodes, which produce high electric stress regions...
Charge profiles in LDPE containing both DCP and sulfur-containing antioxidants, which were heat-pressed under different temperatures, were examined to study the heterocharge generation mechanism in polymeric dielectrics. Negative hetero-charges near the positive electrode were detected in samples containing both DCP and the antioxidants when those samples were soaked in acetophenone. The negative...
To study the effects of antioxidants on space charge generation in XLPE and EPR, charge profiles in XLPE and EPR containing phenolic and sulfur type antioxidants were examined. Different charge profiles were detected in both materials containing different kinds of antioxidants. The authors discovered that a negative heterocharge is created near the positive electrode in the acetophenone-soaked XLPE...
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