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Nonlinear Frequency Dependent Transformer Model for Electromagnetic Transient Studies in Power Systems

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2 Author(s)
Avila-Rosales, J. ; The University of Wisconsin ; Alvarado, F.L.

Transformer models for system studies derived without taking into account the frequency dependency of its magnetizing branch are not adequate for representing the transformer performance over a wide range of frequencies and operating conditions. This paper describes a procedure for taking into account the frequency dependent characteristics of the transformer based on an analysis of the electromagnetic field distribution within the laminations of the transformer core. A one dimension linear diffusion problem is analyzed. A simple linear equivalent circuit of the Norton type is synthetized. This circuit is an exact representation of the transformer at any frequency and for any type of excitation.

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Power Apparatus and Systems, IEEE Transactions on  (Volume:PAS-101 ,  Issue: 11 )