Water drop corona effects on full-scale 500 kV non-ceramic insulators

Author

Phillips, A.J. ; Childs, D.J. ; Schneider, H.M.

Author_Institution

Univ. of the Witwatersrand, Johannesburg, South Africa

Volume

14

Issue

1

fYear

1999

fDate

1/1/1999 12:00:00 AM

Firstpage

258

Lastpage

265

Abstract

It is shown that certain regions of commercially available 500 kV non-ceramic insulators have surface electric fields that are above the threshold for water drop corona. Observations made in a full scale accelerated aging chamber, and in service, demonstrate that water drop corona occurs on such insulators. A correlation between the magnitude of the surface electric fields and the condition of the silicone rubber non-ceramic insulator surfaces due to water drop corona is illustrated for two different insulator types in an accelerated aging chamber. Other examples of degradation of nonceramic insulators due to water drop corona are illustrated

Keywords

ageing; corona; drops; insulator testing; life testing; silicone rubber insulators; trees (electrical); 500 kV; full-scale accelerated aging chamber; in-service testing; insulator breakdown tests; nonceramic insulators; silicone rubber; surface electric fields; water drop corona effects; Accelerated aging; Africa; Ceramics; Corona; Degradation; Dielectrics and electrical insulation; Insulator testing; Power transmission lines; Rubber; Surface discharges;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.736734

Filename

736734