3d field-circuit analysis of measurement properties of current transformers with axially and radially connected cores made of different magnetic materials

Authors:
Elzbieta Lesniewska, and Regina Rajchert
Institute of Electrical Power Engineering, Technical University of Lodz; POLCONTACT-WARSZAWA

Abstract
We report results continuing the research which looks at the influence of two different magnetic materials in a core construction on the transformation errors of a current transformer. In this paper we consider the behaviour of two different magnetic materials in a core. They are joined in a different way to the previous study; not axially (one-by-one), but also radially (one inside the second). We have conducted 3D analyses of the electromagnetic field distribution for different cases of current transformers and carried out computations based on the Finite-element numerical method. We compare the results with tests of real-life models.

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