Numerical investigation of 3D flow and thermal effects in a disc-type transformer winding

Torriano, F.; Picher, P.; Chaaban, M.

doi:10.1016/j.applthermaleng.2012.02.011

Cited by 103 publications

(69 citation statements)

References 6 publications

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“…In this year, Skillen et al [7] carried out a CFD simulation of a 2D non-isothermal flow axisymmetric model in order to characterize the oil flow in transformer winding with zigzag cooling. Also, Torriano et al [8] performed a 2D axisymmetric and a 3D simulation of a transformer winding with zigzag cooling to determine the effects of elements of the transformer, such as sticks and intersticks, in the temperature distribution. In 2014, Yatsevsky [9] carried out a 2D axisymmetric simulation of a Conjugate Heat Transfer (CHT) model of a transformer, including the core, the tank and the radiator, in order to predict hot-spots in an oil immersed transformer with natural convection.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the hot-spot temperature of a power transformer with alternative dielectric liquids

Santisteban

Delgado

Ortiz

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of the hot-spot temperature of a power transformer with alternative dielectric liquids

Santisteban

Delgado

Ortiz

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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“…To reduce computational requirements only one pass is considered for each simulation and velocity and temperature profiles obtained in the outlet section are imposed for the inlet section of the next pass, following the methodology in [10].…”

Section: E Meshingmentioning

confidence: 99%

“…In this year, Skillen et al [9] carried out a study of a 2D model for the fluid domain in a non-isothermal axisymmetric simulation in order to characterize the oil flow inside a transformer disc type winding. Also, Torriano et al [10] performed a 2D axisymmetric and a 3D simulation of a transformer winding with zigzag cooling to determine the effects of elements of the transformer, such as sticks and intersticks, in the temperature distribution, that are not considered in 2D model. In 2014, Yatsevsky [11] carried out a 2D axisymmetric simulation of a Conjugate Heat Transfer (CHT) model of a transformer, including the core, the tank and the radiator, in order to predict hot-spots in an oil immersed transformer with natural convection.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of natural esters in a low-voltage disc-type winding of a power transformer

Santisteban

Fernández

Delgado

et al. 2017

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)

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Abstract-This work compares the temperature distribution and hot-spot temperatures obtained in a disc-type winding of a power transformer when using as dielectric liquid a mineral oil or natural esters. The comparison is made with a reference case for mass flow rate and temperature in the inlet and uniform losses for the discs. A further comparison is performed by increasing the mass flow rate at the inlet form 0.78 kg/s to 0.9 and 1.0 kg/s, thus nine case studies are considered in this work. These cases have been analyzed via CFD techniques using the software COMSOL Multiphysics® with a 2D-axysymmetrical model using the Conjugate Heat Transfer module. For the analysis, the hotspot factor H is considered as an indicator of the cooling circuit efficiency since the losses are uniform. Results shows that for the base case, the hot-spot temperature obtained for the mineral oil is 9-11ºC higher than the obtained with esters whereas for the increased mass flow rate, hot-spot temperature of mineral oil is equal or even lower than the obtained for natural esters. The analysis of the hot-spot factor shows the dependence of the cooling circuit efficiency on the kind of oil and inlet conditions.

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“…In this regard there is the interesting work of Torriano et al [9,10]. The first paper [9] zooms in on the required detail of a CFD simulation and the second [10] provides an approach for mapping the results of a 2D simulation to a 3D simulation. CFD simulations also enable the study of hot-streaks in the oil, as done by Skillen et al [11].…”

Section: Introductionmentioning

confidence: 99%

Assessment of a hydraulic network model for zig–zag cooled power transformer windings

Coddé

Veken²,

Baelmans

2015

Applied Thermal Engineering

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The prediction of mass flow distribution is a first, though crucial, step in the thermal design of zig-zag cooled power transformer windings. Typically this prediction is based on thermo-hydraulic network models, which critically depend on the applied correlations. In this paper new correlations for flow through elbows and for dividing/merging flow in T-junctions are numerically extracted from dedicated CFD studies and applied to a case study. It is shown that the new correlations are superior for the prediction of the mass flow distribution for this test case in comparison to correlations thus far available in literature.

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Numerical investigation of 3D flow and thermal effects in a disc-type transformer winding

Cited by 103 publications

References 6 publications

Numerical analysis of the hot-spot temperature of a power transformer with alternative dielectric liquids

Numerical analysis of the hot-spot temperature of a power transformer with alternative dielectric liquids

Thermal analysis of natural esters in a low-voltage disc-type winding of a power transformer

Assessment of a hydraulic network model for zig–zag cooled power transformer windings

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