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Flashover studies on a solid dielectric surface

Solid-gas interface in a high voltage insulating system is often subjected to highly localised critical electrical 
stresses leading to microdischarges and subsequent surface flashover. Such a failure at the interface is of serious concern in a high voltage system. This paper presents results of the power frequency and impulse flashover studies carried out in air on a solid dielectric surface in a non uniform field with air as the surrounding media. The influence of humidity on the power frequency flashover voltages on a solid dielectric surface is also discussed.