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The cold-fog test [for outdoor insulators]

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13 Author(s)
Chisholm, W.A. ; Ontario Hydro Technol., Toronto, Ont., Canada ; Ringler, K.G. ; Erven, C.C. ; Green, M.A.
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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

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Power Delivery, IEEE Transactions on  (Volume:11 ,  Issue: 4 )