Transformer core modeling as applied to slow transients and protective studies

Magnetic core has major effects on the response of transformers at low frequencies. For better understanding of transformer behaviors and modeling them accurately, it is necessary to study core behaviors and their effects on transformer current and voltage waveforms. For better studying core behaviors, it is possible to divide total flux of windings into core and air fluxes. In this paper, modeling of core fluxes by employing the principle of duality method is discussed. At the end, a real 230/63 kV, 125 MVA transformer with two winding and three-legged core has been simulated. Obtained simulation results are compared with test results and good agreement between these results are obtained

[1]  D. N. Ewart.  Digital Computer Simulation Model of a Steel-Core Transformer , 1986, IEEE Power Engineering Review.

[2]  F. de Leon,et al.  Reduced order model for transformer transients , 1992 .

[3]  James Frame,et al.  Hysteresis Modeling in An Electro-Magnetic Transients Program , 1982, IEEE Transactions on Power Apparatus and Systems.

[4]  B. A. Mork,et al.  Transformer modeling for low- and mid-frequency transients - a review , 2005 .

[5]  P. G. Blanken,et al.  A lumped winding model for use in transformer models for circuit simulation , 2001 .

[6]  Yves Bernard,et al.  Dynamic hysteresis modeling based on Preisach model , 2002 .

[7]  Michel Meunier,et al.  A transformer model for winding fault studies , 1994 .

[8]  B.A. Mork,et al.  Transformer modeling for low- and mid-frequency transients - a review , 2005, IEEE Transactions on Power Delivery.

[9]  S. E. Zocholl,et al.  Transformer modeling as applied to differential protection , 1996, Proceedings of 1996 Canadian Conference on Electrical and Computer Engineering.

[10]  F. de Leon,et al.  Complete transformer model for electromagnetic transients , 1994 .

[11]  G. R. Slemon,et al.  Equivalent circuits for transformers and machines including non-linear effects , 1953 .

[12]  J. Tellinen.  A simple scalar model for magnetic hysteresis , 1998 .

[13]  J.R. Bailey,et al.  Hysteresis models for system studies , 1976, IEEE Transactions on Power Apparatus and Systems.

[14]  D. G. Ece,et al.  Modeling of Hysteresis and Power Losses in Transformer Laminations , 2002, IEEE Power Engineering Review.

[15]  Chin E. Lin,et al.  A new method for representation of hysteresis loops , 1989 .

[16]  David C. Hamill,et al.  Lumped equivalent circuits of magnetic components: the gyrator-capacitor approach , 1993 .

[17]  N. Sadowski,et al.  Inverse Jiles-Atherton vector hysteresis model , 2004, IEEE Transactions on Magnetics.

[18]  D. C. Hamill.  Gyrator-capacitor modeling: a better way of understanding magnetic components , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

[19]  F. de Leon,et al.  A simple representation of dynamic hysteresis losses in power transformers , 1995 .

[20]  E. C. Cherry.  The Duality between Interlinked Electric and Magnetic Circuits and the Formation of Transformer Equivalent Circuits , 1949 .

[21]  Alan S. Perelson,et al.  System Dynamics: A Unified Approach , 1976, IEEE Transactions on Systems, Man, and Cybernetics.