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Presence of water droplets over the insulator surface enhances the electric field intensity and leads to electrical breakdown. This is important for outdoor insulation because the combination of moisture and contamination causes flashover at operating voltage; hence affects reliability of power delivery. Electric field has been calculated on insulating surfaces for different patterns of wetting. Simulations...
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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