Numerical analysis of current-limiting cooperation of a 20 mva superconducting transformer and cable

Fumiya Nakamura, Masataka Iwakuma, Shun Miura, Kohichi Yoshida, Akira Tomioka, Msayuki Konno

研究成果: ジャーナルへの寄稿記事

抄録

In a previous study, we developed a 66/6.9 kV-2 MVA REBa2Cu3Oy (REBCO) superconducting transformer with a current-limiting function that was cooled with subcooled liquid nitrogen at 65 K. By considering the flux-flow state, it is possible to quantitatively explain the behavior of REBCO superconducting transformers and cables subjected to a sudden short circuit. Our goal was to demonstrate that limiting an excess fault current to triple the rated current after 0.2 s (while maintaining a superconducting state) was possible with the cooperation of superconducting transformers and cables. For that purpose, a numerical analysis was performed by coupling thermal equations and circuit equations. Consequently, the numerical analysis demonstrated that limiting the excess fault current to triple the rated current after 0.2 s can be achieved by adjusting the thickness of the stabilizing copper layer of REBCO superconducting tapes and the length and critical current, Ic, of the superconducting cable. Through these simulations, the balance of Ic and thickness of copper layers was shown to be important in limiting overcurrent and normal transition rates of the superconducting winding of the transformer and cable.

元の言語英語
記事番号8681412
ジャーナルIEEE Transactions on Applied Superconductivity
29
発行部数5
DOI
出版物ステータス出版済み - 8 1 2019

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transformers
cables
numerical analysis
Numerical analysis
Cables
Electric fault currents
Copper
Superconducting tapes
Superconducting cables
Critical currents
Liquid nitrogen
Short circuit currents
Fluxes
copper
Networks (circuits)
short circuits
liquid nitrogen
tapes
critical current
adjusting

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

これを引用

Numerical analysis of current-limiting cooperation of a 20 mva superconducting transformer and cable. / Nakamura, Fumiya; Iwakuma, Masataka; Miura, Shun; Yoshida, Kohichi; Tomioka, Akira; Konno, Msayuki.

:: IEEE Transactions on Applied Superconductivity, 巻 29, 番号 5, 8681412, 01.08.2019.

研究成果: ジャーナルへの寄稿記事

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