Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Analysis of Water Tree Degradations in Underground Distribution Cables Using Image Measurement

가교폴리에틸렌 지중케이블에서 화상계측을 이용한 수트리 열화현상 분석

  • Kim, Duck-keun (Dept.of Electrical Eng., Chonnam National University) ;
  • Lim, Jang-Seob (Faculty of M.E and Commu. Eng., Mokpo National Maritime Uni.) ;
  • Lee, Jin (Dept.of Electrical Eng., Mokpo National University) ;
  • Lee, Joon-Ung (Dept.of Electrical Eng., Kwangwoon University) ;
  • Kim, Tae-Sung (Dept.of Electrical Eng., Chonnam National University)
  • 김덕근 (전남대학교 전기공학과) ;
  • 임장섭 (목포해양대학교 해양전자.통신공학부) ;
  • 이진 (목포대학교 전기공학과) ;
  • 이준웅 (광운대학교 전기공학과) ;
  • 김태성 (전남대학교 전기공학과)
  • Published : 1998.06.01
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Abstract

Water tree degradations have been considered as one of the most important causes of failure in underground distribution cables with polymeric insulation. Water tree growth is a preliminary step in the sequence of electrical tree initiation and electrical breakdown of the insulation. In this paper, needle electrode is made use of the etching methods and the pellet type specimen is made to observe the water tree in succession. In previous methods are able to observe the tree degradations without cutting and dyeing. The water tree image is recorded on VTR with CCD camera. The tree length of X, Y axis direction and aging area(treeing area) are calculated with image measurement. As a result of this study, water tree is observed by non-destructive method. Electrical tree is initiated from needle electrode tip only but water tree is initiated from total area of water electrode. Electrical tree owing to water treeing is initiated at low electric field and grown with discontinuously. Namely, water tree is shown up a different characteristics of tree growth.

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