Heat Conduction Problems in ${\rm SF}_{6}$ Gas Cooled-Insulated Power Transformers Solved by the Finite-Element Method

Eteiba, Magdy B.; Aziz, M.M. Abdel; Shazly, J. H.

doi:10.1109/tpwrd.2008.915793

Cited by 29 publications

(17 citation statements)

References 5 publications

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“…The thermal conductivity λ and dynamic viscosity µ are nearly not influenced by the gas pressure. Their variation with temperature is obtained by the Sutherland's law, which are, respectively, expressed as [10] (8) where λ 0 and μ 0 are, respectively, the thermal conductivity and dynamic viscosity of the gas mixture at 0 ºC, S is the Sutherland temperature.…”

Section: Finite Element Modelmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Eddy-Current, Fluid and Thermal Coupled Model for the Finite Element Behavior of Gas-Insulated Bus Bars

Wu¹,

Zhou²,

Pei³

2016

Proceedings of the 2015 4th International Conference on Sensors, Measurement and Intelligent Materials

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This paper describes a coupled magnetic eddy-current, fluid and thermal finite-element model to analyze the steady and transient thermal behavior of a three-phase gas-insulated bus bar (GIB). The magnetic eddy-current field is indirectly coupled into the fluid and thermal fields through the power loss density while considering the temperature dependent electrical conductivity. As a new methodology, multiple species transport technique is introduced into the thermal model using computational fluid dynamics (CFD), circumventing the difficulty of applying temperature and geometry dependent heat transfer coefficient on the model boundaries. Good agreement is found between the CFD and experimental results. The proposed methodology is further used to predict the steady and transient thermal behaviors of the GIB under the effects of various gas pressures, gas types, electrical loads, and ambient temperatures, which provides useful sensitivity information for GIB designers in the product development process.

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Section: Finite Element Modelmentioning

confidence: 99%

“…where n is the normal direction of tank surface, ε is emissivity, σ is Stefan-Boltzmann constant. The other one is the closed-type enclosure radiation boundary condition between the outer surface of the conductors and the inner surface of the enclosure, which is expressed as [10]…”

Section: Finite Element Modelmentioning

confidence: 99%

Magnetic Eddy-Current, Fluid and Thermal Coupled Model for the Finite Element Behavior of Gas-Insulated Bus Bars

Wu¹,

Zhou²,

Pei³

2016

Proceedings of the 2015 4th International Conference on Sensors, Measurement and Intelligent Materials

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“…The natural convective heat transfer coefficient can be determined by classical Nusselt number described as [15] ( )…”

Section: Convective Heat Transfer Boundarymentioning

confidence: 99%

Numerical Calculation of Transient Thermal Characteristics in Gas-Insulated Transmission Lines

Shu

Ling

et al. 2013

TELKOMNIKA

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“…The flow and temperature distribution calculation methods mainly include the finite volume method (FVM), [4][5][6][7][8] finite element method (FEM), [9][10][11][12] finite difference method (FDM), and leastsquare finite element method (LSFEM). [13][14][15] The FVM has the advantages of high calculation accuracy, good numerical solution stability, and wide applicability, and it is one of the most commonly used methods in fluid mechanics.…”

Section: Introductionmentioning

confidence: 99%

“…The fluid-solid interface and the wall surface need to be treated separately when dealing with temperature field boundary conditions. 9 For multi-media models with complex boundaries, the computational complexity will be increased significantly. The FEM is an efficient numerical calculation method that can solve various computational fluid dynamic problems, 11,16 and the continuity of heat flow density can be satisfied automatically and does not need to be treated separately as the FVM does.…”

Section: Introductionmentioning

confidence: 99%

A two-dimensional transient fluid-thermal coupling method for temperature rising calculation of transformer winding based on finite element method

Liu

Rong

et al. 2020

AIP Advances

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In order to study the characteristics of the temperature variation in oil-immersed power transformer windings during operation, a two-dimensional transient fluid-thermal coupling calculation method for the transient temperature rising of transformer windings is proposed. Based on the dimensionless least-square finite element method (DLSFEM), the two-dimensional transient fluid-thermal coupling calculation method calculates the velocity distribution of the transformer flow field at different time instants, and based on the upwind finite element method, the temperature distribution at each moment is calculated. Considering the influence of the nonlinear material properties and winding Joule loss on the calculation results, the sequential iteration method is applied to solve the fluid-thermal coupling problem, and finally, the characteristics of the field temperature change are obtained. Compared with the traditional least-square finite element method, the DLSFEM has smaller stiffness matrix number conditions, and the corresponding discrete equations have better convergence. An oil-immersed power transformer winding model is taken as an instance, and the temperature distribution is calculated by the proposed method and the commercial computational fluid dynamic software Fluent. The calculation results of the proposed method are basically consistent with those of Fluent, and its iterative number is much less than that of Fluent, which greatly improves the calculation efficiency.

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Heat Conduction Problems in ${\rm SF}_{6}$ Gas Cooled-Insulated Power Transformers Solved by the Finite-Element Method

Cited by 29 publications

References 5 publications

Magnetic Eddy-Current, Fluid and Thermal Coupled Model for the Finite Element Behavior of Gas-Insulated Bus Bars

Magnetic Eddy-Current, Fluid and Thermal Coupled Model for the Finite Element Behavior of Gas-Insulated Bus Bars

Numerical Calculation of Transient Thermal Characteristics in Gas-Insulated Transmission Lines

A two-dimensional transient fluid-thermal coupling method for temperature rising calculation of transformer winding based on finite element method

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