کنفرانس مهندسی برق ایران

صفحه اصلی / سی و چهارمین کنفرانس بین المللی مهندسی برق

Coupled Magnetic Thermal Finite Element Modeling of a Dry Type Distribution Transformer

نویسندگان :

Fataneh Zekryapour Kashtali¹ Esmaeil Fallah Choolabi²

1- University of Guilan 2- University of Guilan

کلمات کلیدی :

Finite Element Method (FEM)،Magnetic Analysis،Thermal Analysis،Dry-Type Transformer،Natural Convection

چکیده :

This paper presents a coupled magnetic–thermal finite element modeling of a 25 kVA three-phase dry-type distribution transformer. The magnetic field is solved using a scalar potential formulation with a nonlinear magnetization characteristic, and core losses are evaluated using the Bertotti loss model. Joule losses in the windings are derived from RMS phasor currents and copper resistivity, and then applied as volumetric heat sources in the thermal solver. A nonlinear convection boundary condition is introduced, where the heat transfer coefficient varies with local temperature, surface orientation, and geometric coordinates. This approach enables more realistic modeling of natural cooling. The results show that the highest temperature occurs in the central winding region, while trapped air in transformer windows significantly affects heat dissipation. A clear correlation between flux density distribution and thermal patterns in the core is observed. The proposed methodology offers a practical and flexible tool for multiphysics analysis and industrial design optimization.