Conference paper
Partial discharge patterns related to surface deterioration in voids in epoxy
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
Language: | English |
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Year: | 1990 |
Pages: | 115-119 |
Proceedings: | 1990 IEEE International Symposium on Electrical Insulation |
ISSN: | 1089084x and 01642006 |
Types: | Conference paper |
DOI: | 10.1109/ELINSL.1990.109721 |
ORCIDs: | Holbøll, Joachim |
Optical microscopy Optical pulses Partial discharges Performance analysis Performance evaluation Pulse measurements Resistors Surface discharges Testing Voltage bush like tree channel growth deep pit formations electric breakdown of solids electric stress electrical tree growth epoxy inception level naturally formed spherical voids partial discharge patterns partial discharges plastic plastics single channel-like tree surface deterioration surface discharges voids