Partial Discharge Localization in Transformers Using Detailed Modeling of Winding and Calibration Pulses

Abstract

This paper uses detailed model for computation of sectional winding transfer functions that are necessary for partial discharge (PD) localization in transformer windings. In order to increase the accuracy of PD localization in practical cases, the circuit of PD detection impedance is included in the model. Also to increase the reliability, the use of calibration pulses is included in the localization algorithm. By that, it is possible to optimize model parameters before employing them to find the location of discharges. The accuracy of the method is analyzed by measurements on a special prepared transformer in laboratory.