An efficient investigation of coupled electromagnetic-thermal-fluid numerical model for temperature rise prediction of power transformer

Ahn, Hyun-Mo; Lee, Byuk-Jin; Hahn, Sung-Chin

doi:10.1109/icems.2011.6073995

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…Ahn et al also adopted 3-D coupled electromagnetic-fluid-thermal field analysis for temperature prediction of a power transformer. Through comparing with the experimental values, validity of the proposed coupling method was verified [13]. Li et al simulated the hot-spot temperature-rise in a transformer based on magnetic-thermal coupling methods which was consistent with the theoretical analysis.…”

Section: Introductionsupporting

confidence: 53%

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Electro‐Thermal Coupling Field Simulation of Converter Transformer Valve Side Bushings

Wang

Xie

Tian

et al. 2020

IEEJ Transactions Elec Engng

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In the actual operation, converter transformer valve side bushings are subjected to high voltages and large current loads with large number of harmonics simultaneously. In our previous papers, using the 3-D electromagnetic-fluid-thermal coupling analysis method, the 3-D temperature distribution of a converter transformer valve side bushing was researched, and the heating and dissipation characteristics of the bushing were analyzed. However, the electric field distribution of the bushing is affected by the temperature gradient inside the bushing. Related researches about the electro-thermal coupling field of the bushing are rare and most researches are concentrated on the single factor of voltage or temperature. In this paper, by using the electro-thermal coupling field simulation method proposed in our previous paper, the effect of the core outline size on the electric field distribution of the bushing under a certain temperature gradient was investigated. In addition, by using the transient electric field simulation method, the electric field distribution of the bushing in one cycle subjected to an actual voltage waveform and the current in temperature rise test simultaneously was analyzed considering the effect of the Joule heating power of the core. The proposed method will be able to provide a computation basis for the structure design and optimization of converter transformer valve side bushings.

show abstract

Section: Introductionsupporting

confidence: 53%

“…also adopted 3‐D coupled electromagnetic‐fluid‐thermal field analysis for temperature prediction of a power transformer. Through comparing with the experimental values, validity of the proposed coupling method was verified [13]. Li et al .…”

Section: Introductionmentioning

confidence: 98%

Electro‐Thermal Coupling Field Simulation of Converter Transformer Valve Side Bushings

Wang

Xie

Tian

et al. 2020

IEEJ Transactions Elec Engng

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“…Some scholars did great works on air‐cooled induction motors with a 3D coupled electromagnetic‐fluid‐thermal method and proposed a novel multi‐component fluid model to deal with the influence of rotor rotation upon the air convection [9]. Power losses were calculated from finite element method, and were used as input source of 3D thermal‐fluid analysis based on computational fluid dynamics for an oil‐cooled transformer [10]. Considering internal and external air, temperature rise of a dry‐type natural‐cooling power transformer was analysed in short‐circuit, open‐circuit and nominal parameters [11].…”

Section: Introductionmentioning

confidence: 99%

Temperature rise of a dry‐type transformer with quasi‐3D coupled‐field method

Liu

Ruan

Wen

et al. 2016

IET Electric Power Applications

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A quasi-3D coupled-field method is introduced and applied on a ventilated dry-type transformer to study temperature rise of windings in this study. A simplified 3D model was first established to calculate energy loss of core and velocity distribution in a plane above the lower yoke. Then two accurate 2D models were built up to figure out energy losses in the windings. With a combination of indirect and sequential coupling, energy losses of both windings and core were used as heat source, and velocities for both 2D models were applied as boundary condition for analysing fluid-thermal field. Final results of temperature rise were calculated with temperature rise of two 2D models. In the end, numerical results were compared with experimental data to prove the effectiveness of this method.

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“…We mainly investigated coupled electromagnetic-thermal problem. Now, in this paper, a multi-physics analysis that can produce an accurate temperature rise prediction in an oilimmersed transformer is presented to obtain the more accurate results than our previous works [6,7]. To couple thermal, electromagnetic, and fluid fields, an algorithm employing an UDF [8] is proposed.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous works [6,7], we dealt with coupled problem such as electromagnetic-thermal field of oilimmersed power transformer. We mainly investigated coupled electromagnetic-thermal problem.…”

Section: Introductionmentioning

confidence: 99%

Multi-physics Analysis for Temperature Rise Prediction of Power Transformer

Ahn¹,

Kim²,

Oh³

et al. 2014

Journal of Electrical Engineering and Technology

Self Cite

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-In this paper, a method for multi-physics analysis of the temperature-dependent properties of an oil-immersed transformer is discussed. To couple thermal fields with electromagnetic and fluid fields, an algorithm employing a user defined function (UDF) is proposed. Using electromagnetic analysis, electric power loss dependent on temperature rise is calculated; these are used as input data for multi-physics analysis in order to predict the temperature rise. A heat transfer coefficient is applied only at the outermost boundary between transformer and the atmosphere in order to reduce the analysis region. To verify the validity of the proposed method, the predicted temperature rises in high-voltage (HV) and low-voltage (LV) windings and radiators were compared with the experimental values.

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An efficient investigation of coupled electromagnetic-thermal-fluid numerical model for temperature rise prediction of power transformer

Cited by 11 publications

References 9 publications

Electro‐Thermal Coupling Field Simulation of Converter Transformer Valve Side Bushings

Electro‐Thermal Coupling Field Simulation of Converter Transformer Valve Side Bushings

Temperature rise of a dry‐type transformer with quasi‐3D coupled‐field method

Multi-physics Analysis for Temperature Rise Prediction of Power Transformer

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