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International Symposium on Electrical Insulating Materials (2005)
Kitakyushu, Japan
June 5, 2005 to June 9, 2005
ISBN: 4-8868-6063-X
pp: 714-717 Vol. 3
T. Saito , Nagoya Univ., Japan
Y. Suzuoki , Nagoya Univ., Japan
ABSTRACT
In order to clarify the mechanism of electrical-tree inception and propagation from a water tree within polyethylene, we have investigated effects of water-tree degradation condition and impulse-voltage application on electrical-tree propagation from water tree. As for the condition of water-tree degradation, we have investigated electrical-tree inception voltage by using NaCl solution with different concentrations. Regardless of concentration, the inception voltage becomes higher with the water-tree size. This is explained by electrical-field moderation. On the other hand, under impulse-voltage application where less field moderation is expected, the increase in tree inception voltage is much higher. This suggests increase in intrinsic breakdown strength in and/or near water-tree region.
INDEX TERMS
sodium chloride solution, electrical tree propagation, water tree degradation, impulse-voltage application, electrical-tree inception, polyethylene, water-tree size, electrical-field moderation, intrinsic breakdown strength
CITATION

F. Komori, Y. Suzuoki, K. Uchida and T. Saito, "Inception and propagation of electrical tree from water tree degradation effects of water-tree degradation condition and impulse-voltage application," International Symposium on Electrical Insulating Materials(ISEIM), Kitakyushu, Japan, 2005, pp. 714-717 Vol. 3.
doi:10.1109/ISEIM.2005.193470
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