Abstract
One of the possible causes of long-time breakdown of low-frequency impregnated paper capacitors and cables is known to be the long-time formation of a conducting bridge between the electrodes, followed by a shorttime thermal breakdown. Such a bridge may consist of polarizable particles, ions or colloidal contaminants of high dielectric constant, particularly conducting material. These particles flow towards a place of maximum stress because of the action of transverse quadratic gradient-E-forces in a nonuniform field, thus forming a conducting path for the short-time development of gas and the subsequent breakdown by ionization. From a long-time breakdown strength of 50 kV/mm there follows a particle diameter of about 40A.
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