DocumentCode :
2557089
Title :
Partial discharge patterns related to surface deterioration in voids in epoxy
Author :
Holboll, J.T. ; Henriksen, M.
Author_Institution :
Dept. of Electr. Power Eng., Tech. Univ. of Denmark, Lyngby, Denmark
fYear :
1990
fDate :
3-6 Jun 1990
Firstpage :
115
Lastpage :
119
Abstract :
Results are presented from an investigation of the relationship between changes in partial discharge patterns and the surface deterioration process taking place in small naturally formed spherical voids in epoxy plastic. The voids were exposed to a moderate electric stress above inception level, where partial discharges were present for more than 1500 h. Two types of electrical tree growth were found, the bush like tree and a single channel-like tree, which led to very different partial discharge patterns. It is concluded that the formation of crystals on a void surface leads to an immediate and easy-to-detect increase in the partial discharge activity with subsequent severe surface deterioration (deep pit formations) in the vicinity of the crystal. However, the partial discharge signal from a specimen with a black channel-like tree structure did not give any indication of channel growth
Keywords :
electric breakdown of solids; partial discharges; plastics; surface discharges; bush like tree; channel growth; deep pit formations; electric stress; electrical tree growth; epoxy; inception level; naturally formed spherical voids; partial discharge patterns; plastic; single channel-like tree; surface deterioration; voids; Optical microscopy; Optical pulses; Partial discharges; Performance analysis; Performance evaluation; Pulse measurements; Resistors; Surface discharges; Testing; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
ISSN :
1089-084X
Type :
conf
DOI :
10.1109/ELINSL.1990.109721
Filename :
109721
Link To Document :
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