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Occurrence of water droplets on outdoor insulators either due to rain, fog, dew etc. leads to localized field enhancement causing partial discharges and dry arcs which ultimately results in complete flashover. Presence of a hydrophobic coating (e.g. RTV coating) inhibits the formation of water films and hence lead to formation of discrete water particles which are less dangerous. In this paper two...
Overhead insulators used for transmission lines rated 500 kV and above, are relatively long, and the voltage distribution along the insulator length generally is non-uniform. Even though contamination of the outdoor insulator due to pollution is one of the prime factors leading to flashover and the resulting transmission line faults, it has been observed that the flashover can occur even before the...
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