Title :
Reduction of cost and losses of transformers by using composite magnetic cores
Author :
Kefalas, Themistoklis D. ; Kladas, A.G.
Author_Institution :
Sch. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Athens, Greece
Abstract :
Even though, the transformer is the most efficient of electrical machines, with efficiencies typically in the high 90s, it is possible to reduce transformer costs and losses by using composite magnetic cores. This paper presents a new composite magnetic core that can be used effectively for manufacturing single-phase and three-phase wound core distribution transformers. The new composite wound core concept is based on experimental evidence concerning the flux density non-uniformity of conventional single-phase and three-phase magnetic wound cores and the losses and magnetization properties of conventional and high permeability Si-Fe grain-oriented steels. A systematic experimental losses and flux distribution analysis of single-phase and three-phase magnetic wound cores is undertaken as well as finite element (FE) analysis considering the bulk anisotropic characteristics of laminated wound cores.
Keywords :
composite materials; cost reduction; finite element analysis; magnetic field measurement; magnetic permeability; transformer cores; transformer windings; bulk anisotropic characteristics; composite magnetic cores; composite wound core concept; electrical machines; finite element analysis; flux density nonuniformity; high permeability silicon-iron grain-oriented steels; laminated wound cores; magnetic field measurement; magnetization properties; single-phase wound core distribution transformer manufacturing; three-phase wound core distribution transformer manufacturing; transformer cost reduction; transformer loss reduction; Magnetic flux; Phase transformers; Power transformers; Steel; Transformer cores; Wounds; Finite element methods; magnetic anisotropy; magnetic cores; magnetic field measurement; magnetic losses; power transformers; soft magnetic materials;
Conference_Titel :
Electrical Machines (ICEM), 2014 International Conference on
Conference_Location :
Berlin
DOI :
10.1109/ICELMACH.2014.6960499
