Coupled thermo-magnetic simulation of a foil-winding transformer connected to a nonlinear load

Author

Driesen, J. ; Deliége, G. ; Belmans, R. ; Hameyer, K.

Author_Institution

ESAT, Katholieke Univ., Leuven, Heverlee, Belgium

Volume

36

Issue

4

fYear

2000

fDate

7/1/2000 12:00:00 AM

Firstpage

1381

Lastpage

1385

Abstract

Foil-winding power transformers contain compact sets of flat conductors having a large aspect ratio. Modeling the eddy currents in the individual foils is therefore difficult and requires completely meshed conductors, especially when the influence of the thermal field on the local conductivity is considered. Coupled 2D magnetic and thermal models of a 30 kVA transformer having 50 secondary foils are presented. In the thermal model, thin layer elements or equivalent anisotropic materials are used to model the insulation material between the conductors. The coupled problem is solved for the steady-state and transient case. A novel method will be introduced to solve the transient coupled problem using time steps, much larger than the magnetic subproblem´s time constants

Keywords

eddy currents; finite element analysis; power transformers; transformer windings; transient analysis; 30 kVA; aspect ratio; completely meshed conductors; coupled 2D magnetic/thermal models; coupled thermo-magnetic simulation; eddy currents; equivalent anisotropic materials; flat conductors; foil-winding transformer; insulation material; local conductivity; nonlinear load; power transformers; secondary foils; thermal field; time constants; time steps; transient coupled problem; Anisotropic magnetoresistance; Conducting materials; Conductors; Couplings; Eddy currents; Magnetic anisotropy; Perpendicular magnetic anisotropy; Power transformer insulation; Power transformers; Thermal conductivity;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.877696

Filename

877696