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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...
We have developed in-situ space charge measurement system during ageing tests of printed circuit boards by the pulsed electroacoustic method. It can observe space charge profiles at 358 K (85degC) and 85%RH. Experimental results suggest that internal space charge behaviour is strongly affected by the humidity. This technique should contribute to evaluate test methods of insulation layers as well as...
The measurement of volume charges within solid insulators provides needed information important to the evaluation of dielectric performance and the modelling of breakdown processes. Furthemore, electrical insulation such as polyethylene can be crosslinked with penetrating electron irradiation and thus be exposed to charge injection. While polyethylene is a widely used dielectric material, especially...
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