Partial Discharge Resistant Aging Mechanism of Nanocomposite Enamel Wires under Repetitive Surge Voltage Condition

This paper discusses the partial discharge (PD) resistant mechanism of nanocomposite enamel wires under repetitive surge voltage condition for inverter-fed motors. We focused on the reduction of deterioration depth and the surface condition of nanocomposite enamel wires after repetitive surge voltage application with successive PD. Experimental results revealed that the longer lifetime of breakdown of nanocomposite enamel wires compared with the conventional wires would be brought about not only by the filled nano materials, but also by their byproduct on the enamel surface under repetitive PD generation. The erosion of nanocomposite enamel layers was suppressed in depth by the byproduct and dispersed in the longitudinal direction along the enamel surface, which could contribute to the longer lifetime of breakdown than conventional wires.