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Epoxy resin often suffers lower dielectric breakdown strength if micro-fillers are loaded. It might be possible to raise the once lowered breakdown strength, if nano-fillers are added. In this paper, such performances were investigated on model specimens consisting of alumina (Al2O3). First of all, PD (partial discharge) behavior on the surfaces of samples was clarified in the insulation system consisting...
Partial discharge (PD) in a void reflects degradation of insulating material and, therefore, is utilized for insulation diagnosis. Although it is well known that PD pattern changes with voltage application, it is not clear how the pattern change is related to material degradation or how it is related to final breakdown. We simultaneously observed PD characteristics and light emission from partial...
This paper describes experimental study on degradation mechanism of an epoxy-based composite sheet for printed circuit in control unit of inverter-fed motors subjected to repetitive polarity-reversed voltage pulses. The polarity-reversed voltage pulses after a dc prestress are produced by direct grounding of a charged coaxial-cable. Measurements of pressure wave due to partial discharge at the polarity...
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