Pulse Sequence Analysis of Corona Discharge at DC voltage

The high voltage diagnostics must follow the actual state of the industry devices and the problems related to diagnostics methods. One of the diagnostic methods necessary to be solved at this time is the partial discharge detection, diagnostics and analyses in HVDC systems. There is no standardized method for detection of partial discharges in HVDC systems supplied with DC voltage. The presented study shows the application of pulse sequence analysis to analyze the partial discharges at DC voltage. There has been prepared the experiment with typical corona arrangement, needle-plane, to study and analyze the partial discharges at DC voltage. The measured data at DC voltage are compared to data measured at the same arrangement at AC voltage. The pulse sequence analysis has been applied for both AC and DC voltage and the data are plotted and compared. The aim of the study is to find the connection of pulse sequence data between AC and DC.