Partial discharge resistant mechanism of newly developed enameled wire

A new enameled wire with inorganic additives has been developed. The wire is a double layered structure whose outer layer contains inorganic additives. It was shown that the new wire has good partial discharge endurance at power-frequency, leading to a lifetime improvement of about an order of magnitude. It was also found that the higher conductivity of the outer layer improved the partial discharge resistant nature owing to the decrease in partial discharge energies