A Review of Transformer Losses

Abstract This article presents an extensive survey of current research on the transformer loss problem, particularly from the view of practical engineering applications. It reveals that the transformer loss problem remains an active research area. This article classified the transformer loss problem into three main groups: (a) tank losses due to high-current bushings, (b) losses in transformer core joints, and (c) stray losses in the transformer tank. It is based on over 50 published works, which are all systematically classified. The methods, the size of transformers, and other relevant aspects in the different works are discussed and presented.

[1]  Song-Yop Hahn,et al.  Improved design of cover plates of power transformers for lower eddy current losses , 1999, IEEE International Magnetics Conference.

[2]  Tang Renyuan,et al.  Computation of eddy current losses by heavy current leads and windings in large transformers using IEM coupled with improved R- Psi method , 1990 .

[3]  Tang Renyuan,et al.  Study on eddy current losses and shielding measures in large power transformers , 1994 .

[4]  Paul P. Biringer,et al.  Efficiency of eddy current shielding of structural steel surrounding large currents: a circuit approach , 1991 .

[5]  Johan Driesen,et al.  Experimental study to reduce the distribution-transformers stray losses using electromagnetic shields , 2002 .

[6]  Keizo Inagaki,et al.  Eddy Currents in Structure Surrounding Large Current Bushings of a Large Capacity Transformer , 1981 .

[7]  C. Guerin,et al.  3D Eddy Current Loss Calculation in Transformer Tanks Using the Finite Element Method , 1992, Digest of the Fifth Biennial IEEE Conference on Electromagnetic Field Computation.

[8]  J. Turowski,et al.  Eddy current losses and hot-spot evaluation in cover plates of power transformers , 1997 .

[9]  Norio Takahashi,et al.  Optimal design of tank shield model of transformer , 2000 .

[10]  H. O'Connor.  Shielding and magnetic field reduction for small and medium size transformers and reactors , 1993, Proceedings of Electrical/Electronics Insulation Conference.

[11]  Jiansheng Yuan,et al.  Analysis on the Shielding Effect of the Power Transformer Tank , 2007 .

[12]  W. G. Deuring.  Induced Losses in Steel Plates in the Presence of an Alternating Current , 1957, Transactions of the American Institute of Electrical Engineers Part III Power Apparatus and Systems.

[13]  R. S. Girgis,et al.  Magnetic flux distributions in transformer core joints , 2000 .

[14]  D. C. Johnson,et al.  Calculation and reduction of stray and eddy losses in core-form transformers using a highly accurate finite element modelling technique , 1993 .

[15]  Stefanos Kollias,et al.  A novel iron loss reduction technique for distribution transformers based on a combined genetic algorithm - neural network approach , 2001 .

[16]  R. S. Girgis,et al.  Flux distribution and core loss calculation for single phase and five limb three phase transformer core designs , 2000 .

[17]  R. Escarela-Perez,et al.  Improved insert geometry for reducing tank-wall losses in pad-mounted transformers , 2004, IEEE Transactions on Power Delivery.

[18]  Norio Takahashi,et al.  Magnetic performance of step-lap joints in distribution transformer cores , 1982 .

[19]  S. A. Khaparde,et al.  Stray loss evaluation in power transformers-a review , 2000, 2000 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.00CH37077).

[20]  N. Mullineux,et al.  Eddy-current shielding of transformer tanks , 1966 .

[21]  A. Moses,et al.  Flux distribution and power loss in the mitered overlap joint in power transformer cores , 1973 .

[22]  Pavlos S. Georgilakis.  Spotlight on Modern Transformer Design , 2009 .

[23]  Tang Renyuan,et al.  Eddy current fields and overheating problems due to heavy current carrying conductors , 1994 .

[24]  Helmut Pfützner,et al.  Three-dimensional flux distributions in transformer cores as a function of package design , 1994 .

[25]  Helmut Pfützner,et al.  Influence of air gaps in stacked transformer cores consisting of several packages , 1994 .

[26]  Zvonimir Valković,et al.  Improvement of Transformer Core Magnetic Properties Using the Step-lap Design , 1992 .

[27]  Rafael Escarela-Perez,et al.  2D finite-element determination of tank wall losses in pad-mounted transformers , 2004 .

[28]  N. Mullineux,et al.  Some effects of eddy currents in aluminium transformer tanks , 1973 .

[29]  N. D. Hatziargyriou,et al.  AI helps reduce transformer iron losses , 1999 .

[30]  L. Haydock,et al.  Calculating stray losses in power transformers using surface impedance with finite elements , 1992 .

[31]  H. Otani,et al.  Eddy Currents in Structure Surrounding Large Current Bushings of a Large Capacity Transformer , 1981, IEEE Transactions on Power Apparatus and Systems.

[32]  P. D. Agarwal.  Eddy-current losses in solid and laminated iron , 1959, Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics.

[33]  S. A. Khaparde,et al.  Evaluation of flitch plate losses in power transformers , 1999 .

[34]  Tang Renyuan,et al.  Solutions of three-dimensional multiply connected and open boundary problems by BEM in three-phase combination transformers , 1992 .

[35]  Zvonimir Valkovic.  Calculation of the losses in three-phase transformer tanks , 1980 .

[36]  H. Poritsky,et al.  Eddy-current losses in a semi-infinite solid due to a nearby alternating current , 1954, Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics.

[37]  F. J. Vogel,et al.  A Stray Loss Problem in Transformer Tanks [includes discussion] , 1954, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems.

[38]  M. Pietruszka,et al.  Lamination of T-joints in the transformer core , 1996 .

[39]  J. Driesen,et al.  Reducing Losses in Distribution Transformers , 2002, IEEE Power Engineering Review.

[40]  R. S. Girgis,et al.  Experimental investigations on effect of core production attributes on transformer core loss performance , 1998 .

[41]  F. J. Vogel,et al.  A stray loss problem in transformer tanks , 1954, Electrical Engineering.

[42]  B. Szabados,et al.  A New Approach to Determine Eddy Current Losses in the Tank Walls of a Power Transformer , 1987, IEEE Transactions on Power Delivery.

[43]  M. Poloujadoff,et al.  New transformer model including joint air gaps and lamination anisotropy , 1998 .

[44]  A. Kladas,et al.  Multiple Grade Lamination Wound Core: A Novel Technique for Transformer Iron Loss Minimization Using Simulated Annealing With Restarts and an Anisotropy Model , 2008, IEEE Transactions on Magnetics.

[45]  J. Turowski,et al.  Evaluation of eddy current losses in the cover plates of distribution transformers , 2004 .

[46]  Johan Driesen,et al.  Impact of the joint design parameters on transformer losses , 2003 .