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Thermo-Hydraulic Analysis of a Tri-Axial High-Temperature Superconducting Power Cable with Respect to Installation Site Geography

Author

Listed:
  • Youngjun Choi

    (Department of Mechanical Engineering, Changwon National University, Changwon 641-773, Korea)

  • Dongmin Kim

    (Department of Mechanical Engineering, Changwon National University, Changwon 641-773, Korea)

  • Changhyung Lee

    (Department of Mechanical Engineering, Changwon National University, Changwon 641-773, Korea)

  • Duyeon Won

    (Korea Electric Power Corporation Research Institute, Daejeon 34056, Korea)

  • Jaeun Yoo

    (Korea Electric Power Corporation Research Institute, Daejeon 34056, Korea)

  • Hyungsuk Yang

    (Korea Electric Power Corporation Research Institute, Daejeon 34056, Korea)

  • Seokho Kim

    (Department of Mechanical Engineering, Changwon National University, Changwon 641-773, Korea)

Abstract

Various high-temperature superconducting (HTS) power cables are being developed or are ready for commercial operation to help energy suppliers meet the growing power demand in urban areas. Recently, triaxial HTS power cables have been developed by Korea Electric Power Corporation (KEPCO) and LS Cable & System. Further, KEPCO has been planning to install a 2 km long 23 kV/60 MVA triaxial HTS power cable to connect the Munsan and Seonyu substations and increase the stability of the power grid. The HTS power cables should be cooled down to a cryogenic temperature near 77 K. A thermo-hydraulic analysis of the cooling system considering the geographical characteristics of the installation site is essential for long-distance sections. This paper describes the thermo-hydraulic analysis of the triaxial HTS power cable to determine the proper mass flow rates of subcooled liquid nitrogen that meet the operating temperature and pressure of the cable for four configurations of cooling systems: (1) a single cooling system with an external return path, (2) a dual cooling system with an external return path, (3) a single cooling system with an internal return path, and (4) a dual cooling system with internal return path. Since the flow characteristics in a corrugated cable cryostat differ significantly from those in a typical annular tube, a computational fluid dynamics (CFD) analysis was conducted to estimate the pressure drop along the cable cryostat. With the CFD analysis and given heat loads in the cable, the temperature and the pressure variations along the cable were calculated and their pros and cons were compared for each configuration of the cooling system. This thermo-hydraulic analysis will be referenced in the actual installation of the HTS power cable between the Munsan and Seonyu substations.

Suggested Citation

  • Youngjun Choi & Dongmin Kim & Changhyung Lee & Duyeon Won & Jaeun Yoo & Hyungsuk Yang & Seokho Kim, 2020. "Thermo-Hydraulic Analysis of a Tri-Axial High-Temperature Superconducting Power Cable with Respect to Installation Site Geography," Energies, MDPI, vol. 13(15), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:3898-:d:392394
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    References listed on IDEAS

    as
    1. Seok-Ju Lee & Hae-Jin Sung & Minwon Park & DuYean Won & Jaeun Yoo & Hyung Suk Yang, 2019. "Analysis of the Temperature Characteristics of Three-Phase Coaxial Superconducting Power Cable according to a Liquid Nitrogen Circulation Method for Real-Grid Application in Korea," Energies, MDPI, vol. 12(9), pages 1-11, May.
    2. Seok-Ju Lee & Seong Yeol Kang & Minwon Park & DuYean Won & Jaeun Yoo & Hyung Suk Yang, 2020. "Performance Analysis of Real-Scale 23 kV/60 MVA Class Tri-Axial HTS Power Cable for Real-Grid Application in Korea," Energies, MDPI, vol. 13(8), pages 1-13, April.
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    Cited by:

    1. Francisco Ferreira da Silva & João F. P. Fernandes & Paulo José da Costa Branco, 2022. "Superconducting Electric Power Systems: R&D Advancements," Energies, MDPI, vol. 15(19), pages 1-10, October.
    2. Sisi Peng & Chuanbing Cai & Jiaqi Cai & Jun Zheng & Difan Zhou, 2022. "Optimum Design and Performance Analysis of Superconducting Cable with Different Conductor Layout," Energies, MDPI, vol. 15(23), pages 1-14, November.

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