Electrical tree initiation

Author

Shimizu, N. ; Laurent, C.

Author_Institution

Dept. of Electr. Eng., Nagoya Univ., Japan

Volume

5

Issue

5

fYear

1998

fDate

10/1/1998 12:00:00 AM

Firstpage

651

Lastpage

659

Abstract

This paper reviews the recent understanding of the initiation mechanisms of electrical trees and the phenomena occurring during the induction period in the discharge free condition. The importance of charge injection in electrical tree initiation is well established, not only under dc or impulse stresses, but also under ac stress. Electroluminescence can be used as a monitor for charge injection. Tree initiation from field enhancing locations under moderate stress proceeds through cumulative degradation reactions and cavity formation caused by injected charge. The dependence of tree initiation on temperature and the nature of dissolved gases, underline the importance of free volume processes, and therefore of polymer morphology. Electron avalanche type tree initiation is strongly influenced by field modification due to space charge and also by the size of the high field region

Keywords

avalanche breakdown; electroluminescence; space charge; trees (electrical); AC stress; DC stress; cavity formation; degradation reaction; dissolved gas; electrical tree initiation; electroluminescence; free volume; high field electron avalanche; impulse stress; polymer morphology; space charge injection; Degradation; Electroluminescence; Electrons; Fault location; Gases; Morphology; Polymers; Space charge; Stress; Temperature dependence;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.729688

Filename

729688