Modelling of HVDC wall bushing flashover due to uneven wetting

Author

Tang, L. ; Raghuveer, M.R.

Author_Institution

Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada

Volume

14

Issue

1

fYear

1999

fDate

1/1/1999 12:00:00 AM

Firstpage

194

Lastpage

199

Abstract

An electric field based flashover model is proposed to predict the flashover voltage of an unevenly wetted HVDC wall bushing. Criteria for initiation and propagation of discharges have been incorporated in the model. The critical flashover voltage of a 600 kV wall bushing has been predicted and it is shown that the flashover stresses are very close to experimentally derived values, i.e. 60-70 kV/cm. Important aspects of wall bushing flashover such as critical dry zone length, the U-shaped characteristic of critical flashover voltage versus dry zone length, the effect of waterdrops, influence of rain conductivity and altitude are well reproduced and explained by the model

Keywords

HVDC power transmission; bushings; electric fields; flashover; trees (electrical); HVDC wall bushing flashover; U-shaped flashover characteristic; altitude; critical dry zone length; discharge propagation; electric field; flashover stress; flashover voltage prediction; rain conductivity; uneven wetting; waterdrops; Conductivity; Flashover; HVDC transmission; Insulation; Insulators; Numerical models; Predictive models; Rain; Stress; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.736714

Filename

736714