An Electromagnetic Time Reversal Technique to Locate Partial Discharge in Transformer Winding

Abstract

This letter introduces a new technique based on electromagnetic time reversal (EMTR) theory to locate partial discharge (PD) in transformer windings. The technique involves measuring PD signals at both ends of the winding, creating a ladder network model of the winding, and subsequently time-reversing and back-injecting the measured PD signals into the ladder network model. The PD current signal energy is then calculated for different guessed PD locations (GPDLs) using the ladder network model, and the actual PD location is identified as the location that corresponds to the maximum energy concentration. Ultimately, the simulation-based validation confirms the capability of the technique to accurately identify the location of PD within transformer winding.