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Modeling ferroresonance in single-phase transformer cores with hysteresis

Ferroresonance is a highly dynamic and nonlinear power quality phenomenon caused by nonlinear inductances in ferromagnetic materials and power system capacitances. It is notorious for causing severe damage to power systems. This paper carries out an investigation into single-phase transformer ferroresonance initiated by switching transients. A hysteretic core model is implemented which includes major and minor hysteresis loops for the study of dynamic nonlinear phenomena. Time-domain waveforms of transformer flux, voltage and magnetizing current are computed from the model. Poincare and phase-plane portraits are used to examine the stability domain of observed ferroresonance modes.