Digital location of partial discharges in HV cables

This paper deals with a new digital system for locating partial discharges (PDs) in high voltage (HV) cables under noisy conditions. After an introduction to different PD location methods and their limits, the possibility of PD location through the pulse separation method is introduced. Digital filtering performed with predictor filters is described. Extensive investigations are carried out to determine the effectiveness of these filters, as well as their limitations, in their use for PD and noise separation. The results concerning the application of filtering on PD and noise signals measured on an HV cable under noisy conditions are presented