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Frequency dependent eddy current models for nonlinear iron cores

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4 Author(s)
Tarasiewicz, E.J. ; Ontario Hydro System Planning, Ottawa, Ont., Canada ; Morched, A.S. ; Narang, A. ; Dick, E.P.

Frequency dependent representations of eddy currents in laminated cores of power transformers are developed. One representation is based on a continued fraction expansion for the frequency dependent magnetizing impedance while the other is based on a discretization of flux distribution within the lamination. Both models are low order and reproduce the frequency characteristics of the transformer magnetizing branch up to 200 kHz with less than 5% error. The importance of modeling the frequency dependence of eddy currents for the calculation of the transient recovery voltage across a low voltage transformer breaker interrupting a nearby fault is demonstrated

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Power Systems, IEEE Transactions on  (Volume:8 ,  Issue: 2 )