Partial Discharge Location in Transformer with Digital Twin Model

Partial discharge (PD) detection and location is crucial for power transformer diagnostics. Normally, the location is determined by solving space-based equations with multiple detected PD signals. This method demands for synchronized measurement which is usually realized by sophisticated wiring. This paper proposes a new method to locate the PD by non-synchronized signals with the help of digital twin model. A finite element method (FEM) model for ultrasonic PD signal propagation is established for a specific transformer, which serves as the digital twin. By comparing the results from this digital twin and the measured signals, PD can be located. Example is shown for a 750 kV transformer. The simulation result validates the proposed approach.