The Location of Partial Discharge Source in the Power Transformer with UHF Sensors

This paper discusses the theory of the location of the partial discharge and carries out a PD experiment with a real power transformer. Five Ultra high frequency (UHF) sensors are used to detect the PD source. The location of the PD source can be analyzed and calculated by establishing a power transformer model and collecting the electromagnetic signals generated from the PD source. A comparison between the actual PD source and the estimated location is also made. Time difference of arrival (TDOA) of distinct signals collected by different sensors can be used to search for the PD location. Distance equations are formulated based on the geometrical relationship and the 2-norm theory. To determine the time difference, first peak method is used in the power transformer model.