Noise rejection and partial discharge identification in HVDC insulation systems

This paper shows techniques for singling out noise in partial discharge (PD) measurements starting from the well-known time-frequency (T-F) map extracted from impulse shape and statistical processing of features extracted from PD-pulse distribution features. A case study shows that the noise rejection procedure which is proposed, very effective in AC, is also promising in DC, and that some kind of automatic identification of noise and PD is feasible resorting to statistical processing of recorded pulses.