On the Behavior of Natural and Artificial Voids in Insulation under Internal Discharge
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Studies made on insulation containing natural voids which usually occur as prolate spheroids and on artificial voids in the form of cylindrical cavities, show that the discharge inception voltage and resulting deterioration above the inception voltage is considerably different in the two types of voids.
[1] F. Dubsky. The Dielectric Strength of Air Films Entrapped in Solid Insulation and a Practical Application of the Problem for Alternator Coils and Cables , 1919, Transactions of the American Institute of Electrical Engineers.