抄録
The electrical breakdown of insulating materials is strongly affected by the formation of space charge in the bulk of materials. Many researchers have attempted to study the relationship between the space charge and the breakdown, but it has not been clarified yet. Although the pulsed electroacoustic (PEA) method has been widely used to observe the space charge profiles, few works show clear evidence of the influence of space charge on the breakdown. We have developed a new PEA system with an interval of sub-millisecond for observing the space charge distribution continuously. We succeeded to observe the space charge dynamics at the breakdown. In this paper we clarify the space charge behavior of LDPE films throughout the breakdown period.
