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Temperature gradient through the cable thickness occurs due to Joule heat arising from the electric current in the high voltage cable conductor, and affects the injection and migration of charge, leading to the insulation failure while a sudden power off or polarity reversal takes place due to the charge accumulation. In this article, based on the PEA (pulsed electroacoustic) method, the space charge...
In the compound insulation which is comprised of cable accessory (e.g. terminal or sheath of cable), interface between different dielectrics or electrode and dielectric is often claimed to be the weakest points due to space charge accumulation and then the increase of adjacent electrical field. Furthermore, the higher temperature of cable conductor caused by Joule heating leads to conductivity gradient...
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