Simulation of single-phase nonlinear and hysteretic transformer with internal faults

This paper presents a complete scheme for simulation of single-phase transformers with internal faults. Traditional methods may not be effective in displaying hysteretic characteristics in the transformer core. The approach in this paper uses transmission line method (TLM) incorporating Jiles-Atherton model to introduce nonlinear hysteresis. A small 25 kVA 11 kV/220 V power transformer with turn-to-earth fault is simulated by applying such a scheme. By comparing these results consistency is shown and by total harmonic distortion (THD) analysis the nonlinear hysteretic features of terminal voltages and currents when fault occurs are investigated