Analysis of AC Losses in a Tri-axial Superconducting Cable

• Published in: IEEE transactions on applied superconductivity Vol. 17; no. 2; pp. 1692 - 1695
• Main Authors: Hamajima, T.., Tsuda, M.., Yagai, T.., Monma, S.., Satoh, H.., Shimoyama, K..
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: AC loss analysis; Alternating current; Applied sciences; azimuthal and axial fields; balanced three phase currents; Balancing; Cables; Coaxial cables; Copper; Current distribution; Current supplies; Electric connection. Cables. Wiring; Electrical engineering. Electrical power engineering; Electronics; Exact sciences and technology; external out-of-phase field; High temperature superconductors; HTS; Magnetic analysis; Magnetic fields; Materials; Phases; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Slabs; Superconducting cables; Superconducting devices; Superconducting epitaxial layers; Superconducting films; Superconductivity; Transport; tri-axial cable; Various equipment and components; azimuthal and axial fields; External field; HTS; Multiple layer; tri- axial cable; Three phase current; AC loss analysis; Superconducting tapes; balanced three phase currents; Three phase circuit; Superconducting cable; Axial field; AC losses; Magnetic field; external out-of-phase field; Comparative study; High temperature superconductor; Machine windings
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2007.898338

High temperature superconducting (HTS) cables have been studied because of low loss and compactness, compared with conventional copper cables. Three-phase cables are usually composed of three single-phase concentric cables. Recently, a tri-axial cable, composed of three concentric phases, has been intensively developed, because it has advantages such as reduced amount of HTS tapes, low leakage fields, low heat leak and compactness, compared with the three single-phase cables. We analysed the three-phase current distributions in the tri-axial cable as functions of winding pitches of three concentric phase layers, and showed the balanced three-phase current distributions in the tri-axial cable. The each layer supplies a transport current under external magnetic field with the same frequency and different phase. We formulate the general form of AC loss of the transport current in combination with the external field with different phase, and analyse the AC loss of the tri-axial cable.