Partial Discharge Source Identification Using Phase Window Analysis of PRPD Data

Electrical discharges which do not completely bridge the electrodes and are localized in nature are called as Partial Discharge (PD). Even though the magnitude of such discharges is small, they degrade the insulation and may eventually lead to breakdown of the system. Therefore measurement and analysis of such discharges is a crucial aspect towards efficient diagnosis of high voltage insulation systems. There are several source of discharges inside the rotating machine like Slot Discharge, Surface Discharge, Delamination etc. Phase Resolved Partial Discharge (PRPD) pattern, obtained from the PD detectors, is the widely used pattern for analyzing PD. PRPD pattern is the representation of PD apparent charge (Q) versus phase angle of applied voltage (Ø) including the information of count of…