Procedure for ratio error and phase displacement prediction of inductive current transformers at different operating conditions

This paper presents an experimental study on inductive current transformers. Their modelling is still a key topic among their literature and the related studies are quite vivid. To this purpose, the paper contributes to the improvement of the transformers' behaviour knowledge under typical operating conditions. In particular, a procedure is proposed to predict ratio error and phase displacement of the current transformer by starting from a fixed loading current and ambient temperature. Moreover, a decomposition procedure is performed to analyse the filtering behaviour and the contribute of the current transformer shunt parameters. Results show the effectiveness of the presented procedure and how the shunt parameters affect the overall ratio error and phase displacement.