2023 Fiscal Year Final Research Report

Study of high capacity superconducting DC power cable using longitudinal magnetic field effect

Research Project

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Project/Area Number	19H00771
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Review Section	Medium-sized Section 21:Electrical and electronic engineering and related fields
Research Institution	Kyushu Institute of Technology
Principal Investigator	Otabe Edmund Soji 九州工業大学, 大学院情報工学研究院, 教授 (30231236)
Co-Investigator(Kenkyū-buntansha)	倪宝栄福岡工業大学, 工学部, 教授 (10248536) 木内勝九州工業大学, 大学院情報工学研究院, 准教授 (90304758)
Project Period (FY)	2019-04-01 – 2023-03-31
Keywords	超伝導体 / 直流電力ケーブル / 交流電力ケーブル / 臨界電流 / 縦磁界効果
Outline of Final Research Achievements	Normally, magnetic fields and electric currents are perpendicular to each other, but by creating a special structure, they can be made parallel, which is called a longitudinal magnetic field. In a longitudinal magnetic field, the critical current, the maximum current that can flow, of superconducting wire is improved. A superconducting power cable has been developed that utilizes this longitudinal magnetic field effect. As a result, a prototype cable capable of carrying 13.1 kA DC, which has a critical current 18% higher than that of conventional cables, was successfully fabricated. A small cable with an outer diameter of 20 mm was also fabricated, and by passing an AC current through it, experimental confirmation was obtained that the AC loss was about twice that of conventional cables, the result that was supported by numerical calculations. This demonstrated the feasibility of passing AC current to the power cable.
Free Research Field	超伝導工学
Academic Significance and Societal Importance of the Research Achievements	超伝導体を用いると抵抗ゼロで電力輸送を行なうことができる。その際に、流すことのできる最大の電流である臨界電流は高い方が、小型で省スペースなケーブルを作ることができる。縦磁界効果を使うと、使う線材は全く同じでも巻線の構造を変えるだけで、臨界電流を大きくすることができる。従ってより性能のいいケーブルを作ることができる。これをこの研究では設計、製作、通電試験まで行なって、実証をすることができた。今後、10年程度で超伝導電力ケーブルの附設が行なわれていくが、その際に実際に使われる技術となる可能性が高い。