Title :
Frequency dependent eddy current models for nonlinear iron cores
Author :
Tarasiewicz, E.J. ; Morched, A.S. ; Narang, A. ; Dick, E.P.
Author_Institution :
Ontario Hydro System Planning, Ottawa, Ont., Canada
fDate :
5/1/1993 12:00:00 AM
Abstract :
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
Keywords :
eddy currents; power transformers; transformer cores; eddy currents; flux distribution; frequency dependent magnetizing impedance; laminated cores; low voltage transformer breaker; nonlinear iron cores; power transformers; transient recovery voltage; Eddy currents; Frequency dependence; Impedance; Iron; Lamination; Low voltage; Magnetic cores; Magnetic flux; Power transformers; Transformer cores;
Journal_Title :
Power Systems, IEEE Transactions on
