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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
Published in:
Power Delivery, IEEE Transactions on
(Volume:14
,
Issue:
1
)
Date of Publication: Jan 1999
- Page(s):
- 194 - 199
- ISSN :
- 0885-8977
- INSPEC Accession Number:
- 6132511
- Digital Object Identifier :
- 10.1109/61.736714
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- Jan 1999
- Sponsored by :
- IEEE Power & Energy Society
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