Partial discharge inception characteristics of an oil impregnated paper insulating system with inserted oil impregnated insulating papers of a removed oil filled cable were investigated. It was found that the partial discharge inception stress of the insulating system with inserted removed insulating papers without deposit was almost the same as that of the insulating system with inserted fresh insulating papers. On the other hand, the partial discharge inception stress of the insulating system with inserted removed insulating papers with deposit was lower than that with inserted fresh insulating papers.
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