Metallic glasses in distribution transformer applications: An update
- 70 Downloads
Metallic glasses suffer substantially lower energy losses than their crystalline counterparts and, therefore, allow increased efficiencies of operation in transformers. This challenge posed by metallic glasses to the use of conventional, crystalline silicon steels as core materials in the manufacture of electrical distribution transformers has found increased recognition, internationally, among manufacturers and users of such transformers. This paper provides an update on the understanding of the behavior of these materials. The focus will be on the properties of Fe-rich metallic glasses, particularly the Fe-B-Si glasses, as these offer excellent soft magnetic characteristics and economic viability. The core loss characteristics of these materials will be discussed in some detail; a recent model for the loss mechanism will be reviewed. Results on the aging behavior of these metallic glasses will be presented, along with a model describing the aging behavior. Finally, the tendency of these materials to lose ductility following anneals will be addressed.
KeywordsDomain Wall Metallic Glass Aging Behavior Core Loss Silicon Steel
Unable to display preview. Download preview PDF.
- 1.METGLAS® is the registered trade name of Allied-Signal Inc. for amorphous alloys of metals.Google Scholar
- 8.T.W. Wu and F. Spaepen:Mechanical Behavior of Rapidly Solidified Materials, S.M.L. Sastry and B.A. McDonald, eds., p. 293, The Metallurgical Society, Warrendale, Pennsylvania, 1986.Google Scholar
- 10.W.C. Leslie and D.W. Stevens:Trans. ASM, 1964, vol. 57, p. 261.Google Scholar
- 15.“The Ultra Efficient Alternative: Amorphous Metal Transformers ...”:GE Power Delivery and Control, Transformer Business Department, General Electric Co., Hickory, North Carolina, 1989.Google Scholar
- 16.Data for the silicon steels were obtained from P.M. Curran, Allied-Signal Inc.Google Scholar
- 17.H.E. Wegner:Moving to METGLAS (An Allied-Signal Publication), 1988, vol. 1.Google Scholar