Affiliations: [a] Weidmann Electrical Technology AG, Rapperswil, Switzerland | [b] Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy
Correspondence:
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Corresponding authors: Massimo Negro, Weidmann Electrical Technology AG, Rapperswil, Switzerland. E-mail: massimo.negro@weidmann-group.com. Roberto Galdi, Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy. E-mail: roberto.galdi@unipv.it
Abstract: The design of industrial rectifier transformers for use in the field of aluminum production requires the evaluation of the effects of current harmonics in the waveforms, in terms of electromagnetic fields interacting with the transformer’s constituent materials. The waveforms of the currents flowing through the windings and high-current output connections of transformers are highly distorted waveforms due to a high presence of harmonics that contribute significantly to the overall losses developed within the system causing overstress of the insulation materials. The evaluation of the electromagnetic effects of these harmonics cannot be approached by means of a time-harmonic steady-state study of the problem, but a time transient must be simulated for a more accurate evaluation.
