| Abstract: | This paper describes the partial discharge (PD) characteristics and V‐t characteristics of several insulating materials, such as liquid crystal polymer, epoxy resins, polyimide, and polyethylene‐terephthalate (PET) with a needle‐plane electrode system at elevated temperature. The life index n for an applied electric field less than 20 kV/mm is found to be about 9 and that for more than 20 kV/mm is found to be less than 4. The PD characteristics of the insulating materials varied. These V‐t characteristics due to PD degradation were similar to those at room temperature except for the absolute life time. © 1998 Scripta Technica, Electr Eng Jpn, 126(1): 15–22, 1999 |
