Partial discharge inception voltage and breakdown voltage of micro cellular resin

This paper deals with partial discharge inception voltage (PDIV) and breakdown voltage (BDV) of novel insulating material including multi micro size cavities to reduce its permittivity and wight as well for insulation performance test of high voltage cable and equipment. PDIV of specimen including multi voids with average diameter of 34 μm decrease with X-ray irradiation. The result suggests that PD would occur in the specimen with average diameter of 34 μm. In addition to BDV and PDIV increases with the decrease of the cavity size.