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Amorphous modular transformers and their 3D magnetic fields calculation with FEM

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Purpose ‐ The purpose of this paper is to examine the calculation of magnetic field distribution in the modular amorphous transformers under short-circuit state including the flux by the voltage supplying. The magnetically asymmetrical transformer (amorphous asymmetrical transformer ‐ AAT) has been compared also with the symmetrical one (amorphous symmetrical transformer ‐ AST). Design/methodology/approach ‐ 3D field problems were analyzed with total ? and reduced f potentials within the finite element method (FEM). The calculated fluxes have been verified experimentally. Findings ‐ The field method which includes voltage excitation is helpful for flux density (B) calculation and winding reactances determination, as well. Calculations and tests yield similar flux distributions in both AST and AAT constructions. One should emphasize that AAT is better for manufacturing and repairing. Research limitations/implications ‐ Owing to very thin (80?ยตm) amorphous ribbon, the solid core has been assumed for computer simulations. Originality/value ‐ Employment of a field method for calculation of the innovative three-phase amorphous modular transformers. New construction of amorphous transformer, i.e. AAT, has been manufactured at Opole University of Technology.
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Keywords: Circuits; Magnetic fields; Transformers

Document Type: Research Article

Publication date: May 8, 2009

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