抄録
In this study, an artificial void model was made on the basis of the Whitehead abc model and time to breakdown of a PP film which formed the artificial void was investigated with the Weibull distribution. Voltage dependence of time to breakdown of the PP film (V-t characteristic) becomes discontinuous at a certain voltage between 12 and 13kV. Furthermore, repetition of the breakdown mechanism transition (fatigue-failure- type→ random-failure-type or early/random-failure- type) occurs at the certain voltage. These results suggest that patterns of surface discharge in the artificial void change from Polbüschel to Gleitbüschel.
