AC losses of HTS power transmission cables using Bi-2223 tapes with twisted filaments

S. Mukoyama*, K. Miyoshi, H. Tsubouti, H. Tanaka, A. Takagi, K. Wada, S. Megro, K. Matsuo, S. Honjo, T. Mimura, Y. Takahashi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


TEPCO and Furukawa have been developing compact 66-kV HTS power cables that can fit into 150-mm ducts. To realize these compact and highly efficient cables, decreasing AC losses in the cables is important. An effective method for reducing the AC losses is to suppress the electromagnetic coupling between layers and between filaments: equalizing the impedance of each layer suppresses the electromagnetic coupling between layers; and using twisted filaments in Bi-2223 tape suppresses the electromagnetic coupling between filaments. An HTS conductor was fabricated using Ag-Mg sheathed tapes that had twisted filaments, and the AC losses in the conductor were measured. The AC losses were lower than that of non-twisted filamentary conductors. Furthermore, the AC losses in an HTS cable were measured at temperatures ranging from 67 K to 77 K, using a device that can cool liquid nitrogen to less than 77 K. As a result of twisting the filaments in the tape and uniforming current distribution for the conductor, the AC losses were reduced to the lowest levels ever achieved.

Original languageEnglish
Pages (from-to)2192-2195
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1 II
Publication statusPublished - 2001 Mar
Externally publishedYes
Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
Duration: 2000 Sept 172000 Sept 22


  • AC losses
  • Bi-2223 tape
  • Filament twist
  • HTS power cable

ASJC Scopus subject areas

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


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