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

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3 Author(s)
Phillips, A.J. ; Univ. of the Witwatersrand, Johannesburg, South Africa ; Childs, D.J. ; Schneider, H.M.

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

Published in:

Power Delivery, IEEE Transactions on  (Volume:14 ,  Issue: 1 )

Date of Publication:

Jan 1999

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