Abstract:The direct breakdown voltage of degassed and oxygen-saturated oil has been measured as a function of gap length (28-200 mu m) using different combinations of etched aluminium, anodized aluminium and stainless steel electrodes. Polarity reversal tests revealed the presence of a crossover point in the breakdown characteristics analogous to that obtained for non-uniform field geometries. It is therefore inferred that the breakdown mechanism is initiated at local asperities on one of the electrode surfaces. The sh… Show more
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