Development of on-line partial discharge detector

This paper describes the development of an on-line partial discharge detector for high voltage apparatus. This detector consists of acoustic and high frequency current sensors, an amplitude part, an AID part, a data communication part and a computer. The authors study the characteristics of digital signal processing for reducing noise in partial discharge detection. We seek methods for good digital signal processing for detection of partial discharges. We apply the adaptive filtering and predictive filtering methods to the electric signal and cross correlation to the acoustic signal. This paper shows the characteristics of these filtering methods and cross correlation in partial discharge detection.