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A 3-D Coupled Magneto-Fluid-Thermal Analysis of a 220 kV Three-Phase Three-Limb Transformer under DC Bias

Author

Listed:
  • Ruohan Gong

    (School of Electrical Engineering, Wuhan University, No. 8, South Road of Eastern Lake, Wuhan 430072, China)

  • Jiangjun Ruan

    (School of Electrical Engineering, Wuhan University, No. 8, South Road of Eastern Lake, Wuhan 430072, China)

  • Jingzhou Chen

    (School of Electrical Engineering, Wuhan University, No. 8, South Road of Eastern Lake, Wuhan 430072, China)

  • Yu Quan

    (School of Electrical Engineering, Wuhan University, No. 8, South Road of Eastern Lake, Wuhan 430072, China)

  • Jian Wang

    (School of Electrical Engineering, Wuhan University, No. 8, South Road of Eastern Lake, Wuhan 430072, China)

  • Shuo Jin

    (School of Electrical Engineering, Wuhan University, No. 8, South Road of Eastern Lake, Wuhan 430072, China)

Abstract

This paper takes a typical 220 kV three-phase three-limb oil-immersed transformer as an example, this paper building transient field-circuit coupled model and 3D coupled magneto -fluid-thermal model. Considering a nonlinear B–H curve, the magneto model uses the field-circuit coupled finite element method (FEM) to calculate the magnetic flux distribution of the core and the current distribution of the windings when the transformer is at a rated current and under direct current (DC) bias. Taking the electric power losses of the core and windings as a heat source, the temperature inside the transformer and the velocity of the transformer oil are analyzed by the finite volume method (FVM) in a fluid-thermal field. In order to improve the accuracy of the calculation results, the influence of temperature on the electrical resistivity of the windings and the physical parameter of the transformer oil are taken into account in the paper. Meanwhile, the convective heat transfer coefficient of the FVM model boundary is determined by its temperature. By iterative computations, the model is updated according to the thermal field calculation result until the maximum difference in hot spot temperature between the two adjacent steps is less than 0.01 K. The result calculated by the coupling method agrees well with the empirical equation result according to IEC 60076-7.

Suggested Citation

  • Ruohan Gong & Jiangjun Ruan & Jingzhou Chen & Yu Quan & Jian Wang & Shuo Jin, 2017. "A 3-D Coupled Magneto-Fluid-Thermal Analysis of a 220 kV Three-Phase Three-Limb Transformer under DC Bias," Energies, MDPI, vol. 10(4), pages 1-9, March.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:4:p:422-:d:93858
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    Citations

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    Cited by:

    1. Haonan Tian & Zhongbao Wei & Sriram Vaisambhayana & Madasamy Thevar & Anshuman Tripathi & Philip Kjær, 2019. "A Coupled, Semi-Numerical Model for Thermal Analysis of Medium Frequency Transformer," Energies, MDPI, vol. 12(2), pages 1-16, January.
    2. Ruohan Gong & Jiangjun Ruan & Jingzhou Chen & Yu Quan & Jian Wang & Cihan Duan, 2017. "Analysis and Experiment of Hot-Spot Temperature Rise of 110 kV Three-Phase Three-Limb Transformer," Energies, MDPI, vol. 10(8), pages 1-12, July.
    3. Rogkas, N. & Karampasakis, E. & Fotopoulou, M. & Rakopoulos, D., 2024. "Assessment of heat transfer mechanisms of a novel high-frequency inductive power transfer system and coupled simulation using FEA," Energy, Elsevier, vol. 300(C).
    4. Antonio Roniel Marques de Sousa & Marcus Vinicius Alves Nunes & Wellington da Silva Fonseca & Ramon Cristian Fernandes Araujo & Diorge de Souza Lima, 2021. "Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions," Energies, MDPI, vol. 14(11), pages 1-19, June.

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