Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 51, Issue 3, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2014.2359956
Keywords
Computational fluid dynamics (CFD); convection heat transfer coefficient; hot-spot temperature rise; magnetic-thermal coupling
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For large power transformers, the hot-spot temperature rise in their structural parts is an essential issue to address. Computation of the hot-spot temperature rise is, however, a complicated engineering problem because of the uneven loss distribution and effect of internal oil flow upon the convective heat transfer coefficients on the body surfaces of transformers. This paper presents a novel approach to compute and analyze the hot-spot temperature rise of the structural parts for an ODFS-334 MVA/500 kV single-phase auto-transformer. The surface convection heat transfer coefficients, which are computed based on computational fluid dynamics, are used as the boundary conditions of the magnetic-thermal coupling analysis using finite-element method. To validate the feasibility and applicability of the proposed method, the numerical results obtained from the proposed method are compared with those of experimental ones.
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