NDLI: Temperature dependence of inception of electrical tree from water-tree degradation

Content Provider	IEEE Xplore Digital Library
Author	Hayashi, Y. Suzuoki, Y. Kato, T. Komori, F. Mashima, H.
Copyright Year	2009
Description	Author affiliation: Chubu Electric Power Company, Nagoya, 459-8522, Japan (Mashima, H.) \|\| Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan (Hayashi, Y.; Suzuoki, Y.; Kato, T.) \|\| Toba National College of Maritime Technology, Toba, Mié, 517-0012, Japan (Komori, F.)
Abstract	In order to clarify the mechanism of electrical-tree inception from water-tree degradation which often determines the remaining life of power cables, we have been investigating electrical tree inception and propagation from water-tree degradation in polyethylene. Some of the results suggested that at higher temperatures the extent of water-tree degradation was much higher than that of water-tree degradation formed at lower temperatures. We, therefore, investigated the temperature dependence of water tree degradation and its effects on electrical tree inception. At 363 K, the water tree growth is much faster than low temperatures and the degradation is severer. When the water tree is wet, electrical tree inception voltage becomes higher, which is explained in terms of electrical-field moderation and suppression of electron acceleration due to the existence of water and so on. In the sample with water tree formed at 363 K, however, the increase in tree inception voltage is small. When the water tree is dry, water tree degradation tends to lower electrical tree inception voltage and to promote the degradation under prolonged ac voltage application. These are explained by structural change due to water tree degradation, such as scission of polymer chains and micro void formation.
Starting Page	498
Ending Page	501
File Size	197685
Page Count	4
File Format	PDF
ISBN	9781424445578
ISSN	00849162
DOI	10.1109/CEIDP.2009.5377732
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature dependence Degradation Trees - insulation Voltage Power cables Electrodes Dielectrics and electrical insulation Electrons Acceleration Needles
Content Type	Text
Resource Type	Article

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Temperature dependence of electrical tree inception from water tree degradation

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