Partial discharge characteristics on applied sine wave voltage frequency with IEC(b) electrode system

This paper describes applied voltage frequency dependence of partial discharge (PD) characteristics for development of frequency accelerating life test of insulating materials. In this paper we try to explain two things one is PD test of insulating materials with higher applied voltage frequency and the other one is partial discharge model to explain the PD characteristics. For the first one, we use an IEC(b) electrode system known as a simple standard model electrode system to measure PD life time. PET (Polyethylene terephthalate) sheets with thickness of 100 micrometer are used under sine wave applied voltage with frequency range of 50 Hz to 10 kHz. We compared several PD characteristics at different applied voltage frequencies and we found that important PD characteristics such as the maximum apparent discharge magnitude is almost independent of the applied voltage frequency within the experimental conditions. This implies that PET film can be tested at higher frequency than power frequency to reduce the test time. The other one is the establishing a PD model to explain the PD characteristics based on the integral equation method and partly succeeded to explain the PD characteristics obtained by IEC(b) electrode system.