Abstract
Starting from the assumption that electric breakdown of liquid hydro-carbons takes place in general far below the intrinsic breakdown strength owing to irremovable and filterable contaminants flowing towards a place of maximum stress where a conducting bridge may be formed, the authors attempt to combine the theory they propose with earlier experimental results. Hydrocarbon oil of rather poor quality was purified by means of an electrostatic Cottrell-filter. This filter removed most of the foreign particles of high dielectric constant, by which the one-hour breakdown strength was increased from about 10 kV/mm to 60 kV/mm.
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