Breakdown Characteristics of Moving Transformer Oil

As a result of investigating breakdown characteristics of moving oil, it has become clear that the breakdown voltage of ac and dc for moving oil is higher than that for stationary oil by 10-15 % at a moving velocity of 5 cm/s region; the former voltage becomes almost equal to the latter voltage in the region of 25 cm/s, and the former is reduced to lower than 90 % of the latter when the moving velocity exceeds 100 cm/s. However, for impulse voltage, the breakdown voltage of moving oil is the same as that of stationary oil.