DocumentCode
886804
Title
Relationship between polarity of surface leader and contact angle on insulator with backing electrode under AC voltage application
Author
Yamano, Y.
Author_Institution
Dept. of Eng., Chiba Univ., Japan
Volume
140
Issue
2
fYear
1993
fDate
3/1/1993 12:00:00 AM
Firstpage
109
Lastpage
112
Abstract
When AC high voltage is applied in air to a cylindrical insulator with a backing electrode the polarity of generated leaderlike surface discharges depends on the contact angle. The contact angle is the angle between the insulating surface and high voltage electrode on the insulator. In the range of the angle from 60 degrees to 120 degrees the negative surface leaders appear; in the range from 120 degrees to 180 degrees the positive surface leaders appear. No negative surface leaders appear in the range of the angle from 120 degrees to 180 degrees . The onset voltage of the positive leader is higher than that of the negative one. AC flashover voltage along the surface in air also shows dependence on the contact angle, which results from the difference in the onset voltage between the positive and the negative leaders. Impulse flashover voltage, on the other hand, shows no precise contact angle dependence.
Keywords
flashover; insulation; surface discharges; AC flashover voltage; AC voltage; backing electrode; cylindrical insulator; impulse flashover voltage; insulator contact angle; leaderlike surface discharges; surface leader polarity;
fLanguage
English
Journal_Title
Science, Measurement and Technology, IEE Proceedings A
Publisher
iet
ISSN
0960-7641
Type
jour
Filename
210760
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