Modelling of Current Transformers Based on Measurements of Frequency Characteristics

This paper presents the problem of equivalent circuit modelling based on of frequency characteristics measurements. Designed and conducted experiment concerned the use of vector fitting method to approximate the frequency characteristics of the current transformer and the implementation of the equivalent circuit model based on the obtained results for simulation purpose. Scope of research included defining purpose and area of studies, designing and performing measurements, selecting a method for characteristics approximation and building an equivalent circuit model.