Experimental validation of the coupled fluid flow, heat transfer and electromagnetic numerical model of the medium-power dry-type electrical transformer

Smołka, Jacek; Nowak, Andrzej J.

doi:10.1016/j.ijthermalsci.2007.11.004

Cited by 54 publications

(48 citation statements)

References 24 publications

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“…Several studies have also been carried out in that direction, developing models of different types of transformers and solving them numerically. Smolka et al [11][12] developed an exhaustive procedure to analyse dry-type three-phase transformers considering an iterative coupling between both models of the electromagnetic and thermal fields. They obtained a lot of information that could be used to improve the thermal design for dry-type cases.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Numerical modelling of natural convection of oil inside distribution transformers

Gastelurrutia

Ramos

Larraona

et al. 2011

Applied Thermal Engineering

103

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Numerical modelling of natural convection of oil inside distribution transformers

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Numerical modelling of natural convection of oil inside distribution transformers

Gastelurrutia

Ramos

Larraona

et al. 2011

Applied Thermal Engineering

103

View full text Add to dashboard Cite

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“…Moreover, for air-cooled dry-type transformers the mathematical description has also been completed with an additional equation for radiative heat transfer [87,89]. In these works heat flux from the device is not only removed by natural or forced convection, but it is also exchanged between the transformer elements and the tank.…”

Section: Mathematical Model Of Flow and Heat Transfer Problemmentioning

confidence: 99%

“…As regards the core, its magnetic permeability is often modeled as a constant value [88,89,91,92]. However, in most cases its dependence on the field [14,15,24,36,79] has to be taken into account.…”

Section: Materials Properties In the Emag Modelmentioning

confidence: 99%

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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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“…Moreover, extended full geometry CFD analyses coupled to electromagnetic simulation of the load and no-load losses in core and windings were presented by Smolka et al [3,4].…”

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confidence: 99%

Thermal Design of Power Transformers via CFD

Wittmaack¹

2015

JEPE

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Abstract:At Siemens, an in-house CFD (computational fluid dynamics) code UniFlow is used to investigate fluid flow and heat transfer in oil-immersed and dry-type transformers, as well as transformer components like windings, cores, tank walls, and radiators. This paper outlines its physical models and numerical solution methods. Furthermore, for oil-immersed transformers, it presents an application to a HV (high voltage) winding in a traction transformer of locomotives, cooled by synthetic ester.

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Experimental validation of the coupled fluid flow, heat transfer and electromagnetic numerical model of the medium-power dry-type electrical transformer

Cited by 54 publications

References 24 publications

Numerical modelling of natural convection of oil inside distribution transformers

Numerical modelling of natural convection of oil inside distribution transformers

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

Thermal Design of Power Transformers via CFD

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