Article,

FLASHOVER PERFORMANCE OF ARTIFICIALLY CONTAMINATED AND ICED LONG-ROD TRANSMISSION LINE INSULATORS

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IEEE Transactions on Power Apparatus and Systems, (1980)

Abstract

The 60 Hz flashover performance of 230 kV and 50,> kV long-rod polymer insulators is compared to standarr' ceramic suspension insulator strings under moder;ite ice conditions. The tests on clean and heavily pre-contaminated insulators were performed indoors to minimize the effects of wind and temperature variations. In general, contaminated and iced long-rod insulators with disc-shaped sheds of uni form diameter do not perform as well as insulators having conicalshaped sheds of alternating diameters. All 230 kV long-rod insulators tested show an improved per formance over conventional ceramic insulation of equivalent length. At 500 kV, only those long-rod polymer insulators that have conical-shaped sheds of alternating diameters show an improved performance ver conventional ceramic insulation. A mechanism .;escribing the flashover of contaminated and iced insulators is proposed and discussed in relation to long-rod insulator designs and performance.

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