3D Finite Element and Mixed Finite-Boundary Element Method for the Magnetic Field Analysis of Power Transformers
نویسندگان
چکیده
Power transformer analysis and design focusing on the equivalent circuit parameter evaluation by magnetic field numerical calculation is presented. Two kinds of numerical techniques are examined: the threedimensional (3D) finite element method (FEM), adopting a particular reduced scalar potential formulation and the 3D mixed finite element-boundary element (FEM-BEM) method. The methods are validated through comparison to the theory of images and analytical solutions and are afterwards applied to a wound core distribution transformer. The results are used for the calculation of the short-circuit impedance and the resulting values are compared to the measured ones. The methodology is very promising for investigation concerning losses and short circuit voltage variations with the main geometrical parameters. Key-Words: power transformers, 3D numerical methods, theory of images, analytical solution, short-circuit impedance.
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