Measurement of prebreakdown electric fields in liquid insulants

Abstract
In recent years, optical techniques have been used to identify and classify prebreakdown phenomena in liquid insulating materials.1–8 This report describes an attempt to duplicate selected previous results and to extent them by combining time-resolved shadowgraphs with time-resolved electric field measurements using the electro-optic Kerr effect. The addition of electric field measurement permits a determination of the effect of space charge on breakdown and provides information as to whether or not prebreakdown trees are electrical conductors.

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