Publisher : The Korean Institute of Electrical Engineers
DOI : 10.5370/JEET.2014.9.4.1290
Title & Authors
Comparison of Power Loss and Magnetic Flux Distribution in Octagonal Wound Transformer Core Configurations Cinar, Mehmet Aytac; Alboyaci, Bora; Sengul, Mehlika;
In this paper, various configurations of octagonal wound transformer core topology, which has previously proved advantages on conventional wound cores, are studied. Each configuration has different joint types and different placement of joint zones on the core. Magnetic flux distributions and power losses of each configuration are analyzed and compared. Comparisons are based on both 2D&3D finite element simulations and experimental studies. The results show that, joint types and their placements on the core cause local flux accumulations and dramatically affect power loss of the core.
J.J. Winders, Jr., Power Transformers Principles and Applications, Marcel Dekker, Inc., 2002.
M. Jones, Comparison of the localized power loss and flux distribution in the butt and lap and mitred overlap corner configurations, IEEE Trans. Magnetics, 10, 1974, pp. 321-326.
A. Basak, C. Higgs, Flux distribution in three phase transformer cores with various T-joint geometries, IEEE Trans. Magnetics, 18, 1982, pp. 670-673.
G.E. Mechler, R.S. Girgis, Magnetic flux distributions in transformer core joints, IEEE Trans. Power Delivery, 15, 2000, pp. 198-203.
F. Loffler, T. Booth, H. Pfutzner, C. Bengtsson, K. Gramm, Relevance of step-lap joints for magnetic characteristics of transformer cores, Electric Power Applications, 142, 1995, pp. 371-378.
E.G. teNyenhuis, R.S. Girgis, G.F. Mechler, Other factors contributing to the core loss performance of power and distribution transformers, IEEE Trans. Power Delivery, 16, 2001, pp. 648-653.
I. Daut, A.J. Moses, Some effects of core building on localised losses and flux distribution in a three-phase transformer core assembled from POWERCORE strip, IEEE Trans. Magnetics, 26, 1990, pp. 2002-2004.
Y. -H. Chang, C. -H. Hsu, C. -P. Tseng, Magnetic Properties Improvement of Amorphous Cores Using Newly Developed Step-Lap Joints, IEEE Trans. Magnetics, 46, 2010, pp. 1791-1794.
T. Nakata, N. Takahashi, Y. Kawase, Magnetic performance of step-lap joints in distribution transformer cores, IEEE Trans. Magnetics, 18, 1982, pp. 1055-1057.
R.M. Del Vecchio et al., Transformer Design Principles, second ed., (CRC Press, 2010).
I. Hernandez, J.C. Olivares-Galvan, P.S. Georgilakis, A Novel Octagonal Wound Core for Distribution Transformers Validated by Electromagnetic Field Analysis and Comparison With Conventional Wound Core, IEEE Trans. Magnetics, 46, 2010, pp. 1251-1258.
D.M. Ionel, M. Popescu, S.J. Dellinger, T.J.E. Miller, R.J. Heideman, M.I. McGilp, On the Variation With Flux and Frequency of the Core Loss Coefficients in Electrical Machines, IEEE Trans. Industry Applications, 42, 2006, pp. 658-667.
D.M. Ionel, M. Popescu, M.I. McGilp, T.J.E. Miller, S.J. Dellinger, R.J. Heideman, Computation of Core Losses in Electrical Machines Using Improved Models for Laminated Steel, IEEE Trans. Industry Applications, 43, 2007, pp. 1554-1564.