A time domain small transformer model under sinusoidal and non-sinusoidal supply voltage

In this paper a numerical technique for generating the instantaneous magnetization characteristic and the instantaneous core loss characteristic of a single-phase transformer is proposed. The hysteresis loop is described by the instantaneous core loss resistance R(t), and the instantaneous magnetizing inductance L(t). This time domain transformer model is applied to calculate the excitation current under sinusoidal and non-sinusoidal supply voltage. These results are compared to those simulated by ATP obtaining a significant improvement. The excitation current determined by the instantaneous parameters R(t) and L(t) fits the experimental data accurately. Copyright (c) 2005 John Wiley & Sons, Ltd.