Critical Points of Simplified Model for Ferroresonance Phenomenon in Single Phase Power Transformers

This paper is aimed at proposing a simplified model of ferroresonance phenomenon in single?phase power transformers. The transformer is modelled and the non?linear equivalent resistance and inductance of the magnetizing branch are determined from open?circuit test. The ferroresonance resulting from energizing the transformer through a series capacitor is assessed and the calculated primary voltage and current values are compared with those measured experimentally. A robust meta-heurtics optimization technique, Simulated Annealing, is applied in this paper for determining for ferroresonance jump up and jump down critical points. The calculated values agreed reasonably with those measured experimentally with a deviation not exceeding 7%.