On-site partial discharge diagnosis and location of high voltage power apparatuses and case study

When a partial discharge (PD) liked discharge signal of high voltage power apparatuses is found, on-site PD diagnosis and location is difficult due to the complicated operating environment. In this paper, a novel diagnosis and location method for suspected PD signals of high-voltage power apparatuses is proposed, including comparison of PRPD, discharge source location and offline test verification. The suspected PD signal of a 35kV high voltage power apparatus is taken as a research case, and the diagnosis and positioning results are performed according to the proposed method. The results show that, through this process, the suspected PD signal can be effectively diagnosed and located, which provides a basis for the outage maintenance of the high voltage power apparatus.