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