This paper describes partial discharge (PD) characteristics and V-t characteristics of several insulating materials such as liquid crystal polymer, epoxy resins, polyimide and polyethylene-telephthalate (PET) with a needle-plane electrode system at elevated temperature. Life index n for the applied electric field less than 20kV/mm is found to be about 9 and that for more than 20kV/mm is found to be less than 4. PD characteristics changed due to insulating materials. Those V-t characteristics due to PD degradation are similar to those at room temperature except absolute life time.
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