Evaluation on Lifetime of Several Corona Armor Tape for Form-Wound Rotating Machines under Partial Discharge Aging

It has been reported that low resistive corona armor tape (CAT) deteriorates due to partial discharge (PD) after the start of operation. The deterioration of CAT is a significant concern as it directly affects the machine's lifetime, so it is important to evaluate the CAT lifetime. We clarified that the CAT lifetime can be organized using PD energy measured by the V-Q Lissajous method. In this paper, we report the lifetime comparison results of two types of CAT materials, polyester-based CAT and silicone-based CAT.