Measurements of Pressure Wave at Electrical Breakdown in PP Film

摘要

Electrical breakdown of a polymer film generates the pressure wave, which is considered to include information about the breakdown initiation point. In this paper, we measured the breakdown pressure wave and the space charge distribution up to electrical breakdown field by using pulse electro-acoustic method in a 30μm thick polypropylene film. We discussed electrical breakdown phenomena based on the breakdown pressure wave and the dependence of space charge distribution on applied field and temperature.