This paper deals with partial discharge inception voltage (PDIV) of enameled wire undergoing mechanical stress with micro cellular coating wire under ac voltage application. A model coil sample with smaller winding diameter than usual one was prepared. It was found that measured PDIV of the inside part of the winding model is smaller than that of the outside of the model. A good agreement is obtained between measured PDIV with that estimated by electric field calculation and Paschen's law of air.
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