INRUSH CURRENT ANALYZING IN THE TRANSFORMERS BASED ON PREISACH MODEL

Inrush current of transformers at the time of switching has many destructive effects on the power systems, so, many researches are being done to estimate the value of it accurately. This phenomenon depends on the non-linear and complicated magnetic characteristics of the transformer core. Unfortunately there is no unique and comprehensive modeling approaches for this problem. In this paper, we propose a plenary model for transformers applying the Preisach model which is a capable one for representating the magnetic behavior of the ferromagnetic materials. The proposed model is able to analyze the transient events such as, transient inrush current and harmonical performance of the transformers. The suggested algorithm minimizes the problems associated with applying the Preisach model into a transformer connected to any external circuit properly.