Calculation of eddy current losses in metal parts of power transformers

Schmidt, Erich; Hamberger, P.; Seitlinger, W.

doi:10.1108/03321640310483039

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…in [89,92]. However, for higher magnetic field values occurring in transformers, the relative magnetic permeability of the core and other magnetic structural parts is field-dependent [14,15,24,36,71,79].…”

Section: Materials Propertiesmentioning

confidence: 99%

“…This computationally effective method has been compared to the approximate method based on the specific loss curve resulting from the bulk model. The authors of [41,79] focused on additional eddy current losses occurring in metal parts of large power transformers as clamping plates and a transformer tank. A combined neural network-genetic algorithm employed for the minimization of wound core losses is given in [33].…”

Section: Background Of Coupled Cfd-electromagnetic Solutionsmentioning

confidence: 99%

“…However, in most cases its dependence on the field [14,15,24,36,79] has to be taken into account. This dependence is determined using different computational and/or experimental techniques and results in the permeability being a function of the magnetic field intensity.…”

Section: Materials Properties In the Emag Modelmentioning

confidence: 99%

“…This can be efficiently carried out by using commercial packages like MCS/EMAS [79], Ansys/Emag [42,89] or in-house codes [6,7,15,26,71,80] utilizing the Finite Element Method (FEM). The electromagnetic analysis yields the local distribution of volumetric heat sources within the core, the coils and other conducting parts like tank, clamping plates, shields.…”

Section: Local Volumetric Heat Sources-coupling With Electromagnetic mentioning

confidence: 99%

See 3 more Smart Citations

Numerical Simulation and Experimental Validation of Coupled Flow, Heat Transfer and Electromagnetic Problems in Electrical Transformers

Smołka

Bíró

Nowak

2009

Arch Computat Methods Eng

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The paper presents a state-of-the-art of the numerical modeling of the coupled problems involving heat, fluid flow and electromagnetic phenomena in electrical transformers. Mathematical descriptions of both Computational Fluid Dynamics (CFD) and electromagnetic (EMAG) models are given. Since these models include other submodels for a definition of boundary conditions as local and temperature-dependent convective and radiative heat fluxes, heat generation terms, temperature-dependent and effective values of material properties for different constructions of coils etc., the component problems published in a subject literature are also reported. Moreover, a coupling procedure of the CFD and EMAG solutions to examine the specific power losses within coils and a core is outlined. On the basis of the mathematical model, a numerical example of a three phase medium-power dry-type electrical transformer is presented. A validation of the numerical calculations is performed using the experimental transformer temperature tests in the short-circuit, open-circuit, and under rated parameters according to the current European Standards for dry-type transformers. During the tests, temperatures were measured at selected points on transformer elements using thermocouples and thermometers, while on the external tank walls an infrared thermography was employed.

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Section: Materials Propertiesmentioning

confidence: 99%

Section: Background Of Coupled Cfd-electromagnetic Solutionsmentioning

confidence: 99%

Section: Materials Properties In the Emag Modelmentioning

confidence: 99%

Section: Local Volumetric Heat Sources-coupling With Electromagnetic mentioning

confidence: 99%

See 2 more Smart Citations

Numerical Simulation and Experimental Validation of Coupled Flow, Heat Transfer and Electromagnetic Problems in Electrical Transformers

Smołka

Bíró

Nowak

2009

Arch Computat Methods Eng

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Representation of high saturated ferromagnetic materials in the finite element analysis of power transformers

Schmidt

CCECE 2003 - Canadian Conference on Electrical and Computer Engineering. Toward a Caring and Humane Technology (Cat. No.03CH374

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In most applications, eddy current losses in ferromagnetic matcrial are generated in a rather thin layer immediately at the surface. The thickness of the saturated layer is limited to a few millimeters, otherwise the losses would cause excessive heat. A novel m a terial formulation with some simplifications regarding the nonlinear magnetic characteristic within the finite element analyses represents the actual behaviour quite accurate. The utilized surface elements deal with the fundamental harmonic offlux density and current density, respectively. Thus, it is possible to represent the mutual influence of flux and eddy currents for complex geometries including ferromagnetic material in a very efficient way.

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Design optimization of power transformers. Part 2. Eddy current analyses for tank wall and core clamping parts

Schmidt

Hamberger²

2004 International Conference on Power System Technology, 2004. PowerCon 2004.

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Calculation of eddy current losses in metal parts of power transformers

Cited by 5 publications

References 10 publications

Numerical Simulation and Experimental Validation of Coupled Flow, Heat Transfer and Electromagnetic Problems in Electrical Transformers

Numerical Simulation and Experimental Validation of Coupled Flow, Heat Transfer and Electromagnetic Problems in Electrical Transformers

Representation of high saturated ferromagnetic materials in the finite element analysis of power transformers

Design optimization of power transformers. Part 2. Eddy current analyses for tank wall and core clamping parts

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