English title

Based on the Preisach theory in hysteresis, this paper presents a novel transformer core model. Unlike existing mathematical-based hysteresis models, the proposed model is based on a physically correct hysteresis model and can precisely represent the actual behaviors of magnetic materials. In addition, the experimental results of a ferroresonance test of a Voltage Transformer (VT) are presented. The accuracies of the proposed model and the EMTP hysteretic model in duplicating the experimental results are investigated. This paper concludes that in studying ferroresonance phenomenon, the hysteresis of the transformer core must be accurately represented. Furthermore, the proposed model presents more accurate results, compared with the EMTP hysteresis model.