Ac loss properties of a 1MVA single-phase HTS power transformer

Masataka Iwakuma, Kazuo Funaki, Kazuhiro Kajikawa, Hideki Tanaka, Takaaki Bohno, Akira Tomioka, Hisao Yamada, Shinichi Nose, Masayuki Konno, Yujiro Yagi, Hiroshi Maruyama, Takenori Ogata, Shigeru Yoshida, Kouichi Ohashi, Katsuya Tsutsumi, Kazuo Honda

Research output: Contribution to journalConference articlepeer-review

76 Citations (Scopus)


We designed and built a single-phase 1 MVA-22/6.9 kV HTS transformer with the multi-layered cylindrical windings composed of Bi2223 parallel conductors. In advance of the design, the ac loss induced in the windings was estimated on the basis of the observed results in a strand. A subcooled liquid nitrogen cryogenic system with the corresponding cooling capacity was developed and attached to the transformer. The actual ac loss was measured by an electrical method. It was a great part of the total heat load and dominated the temperature rise of subcooled liquid nitrogen. We discussed the validity of the present estimation procedure of the ac loss in the windings as compared with the observed results.

Original languageEnglish
Pages (from-to)1482-1485
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1 II
Publication statusPublished - Mar 2001
Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
Duration: Sept 17 2000Sept 22 2000

All Science Journal Classification (ASJC) codes

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


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