Abstract
The dependence of the direct electrical breakdown voltage of degassed oil and oxygen-saturated oil on gap-length for a point-to-sphere electrode system has been studied for both polarities of the point and gaplengths varying from 50 to 800 mu m. The breakdown voltage level was found to depend on the manner by which the polarity reversal was carried out. For a given point polarity the breakdown voltage was always higher when the point electrode was live than when it was earthed. The effect is attributed to the formation of charges having the same sign as that of the live electrode.
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