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Effects of Pre-formed Space Charges by Negative DC Voltages on PD Characteristics in XLPE  

황보승 (호남대 공대 광전자공학과)
이준호 (호서대 전기정보통신공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers C / v.52, no.7, 2003 , pp. 310-313 More about this Journal
Abstract
The purpose of this paper is to evaluate the effects of pre-formed space charges by DC stress on partial discharge(PD) characteristics in XLPE. We have suggested a modified pulsed electro-acoustic(PEA) method and successfully measured both space charge distribution and current simultaneously. It has been demonstrated that the PD patterns are strongly influenced by the pre-formed space charge distributions, which are hardly disappeared up to AC 8㎸ in electrode configuration including air gap between XLPE layer and electrode. From the results, it could be said that the pre-formed space charges by DC stress can play harmful and dangerous roles in insulating system under AC operating voltages because of the field distortion and localization due to the pre-formed space charge.
Keywords
Pulsed electro-acoustic method; Space charge distribution; Partial discharge; XLPE;
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