The cold-fog test [for outdoor insulators]

Author

Chisholm, W.A. ; Ringler, K.G. ; Erven, C.C. ; Green, MA ; Melo, O. ; Tam, Y. ; Nigol, O. ; Kuffel, J. ; Boyer, A. ; Pavasars, I.K. ; Macedo, F.X. ; Sabiston, J.K. ; Caputo, R.B.

Author_Institution

Ontario Hydro Technol., Toronto, Ont., Canada

Volume

11

Issue

4

fYear

1996

fDate

10/1/1996 12:00:00 AM

Firstpage

1874

Lastpage

1880

Abstract

The electrical performance of outdoor insulation degrades severely during combinations of factors that include surface contamination, ice, fog and an ambient temperature that rises through 0°C (T(0°)). Failures at operating voltage on 115 kV, 230 kV and 500 kV power systems occur with increasing probability under those conditions. A new CFT(0°) or “cold-fog” test method has been developed to reproduce the flashovers at all three voltage levels. Three options are identified for improving CFT(0°) performance: use of semi-conductive glazes; substitution of silicone for porcelain; and use of silicone coatings on existing porcelain insulators

Keywords

flashover; fog; insulator contamination; insulator testing; porcelain insulators; silicone insulation; surface contamination; 115 kV; 230 kV; 500 kV; ambient temperature; cold-fog test; electrical performance degradation; flashovers; fog; ice; outdoor insulators; performance; porcelain; power systems; semi-conductive glazes; silicone; surface contamination; voltage levels; Degradation; Dielectrics and electrical insulation; Flashover; Ice surface; Insulator testing; Porcelain; Power systems; Surface contamination; Temperature; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.544270

Filename

544270