Development of a 22kV/6.9kV single-phase model for a 3MVA HTS power transformer

Kazuo Funaki, Masataka Iwakuma, Kazuhiro Kajikawa, Masanori Hara, Junya Suehiro, Takehiro Ito, Yasuyuki Takata, Takaaki Bohno, Shin Ichi Nose, Masayuki Konno, Yujiro Yagi, Hiroshi Maruyama, Takenori Ogata, Shigeru Yoshida, Kouichi Ohashi, Hironobu Kimura, Katsuya Tsutsumi

Research output: Contribution to journalConference articlepeer-review

80 Citations (Scopus)


We have developed a 22kV/6.9kV HTS single-phase transformer cooled by liquid nitrogen for field test, which is a practical model for the single-phase part of a 3MVA HTS power transformer. First, we numerically simulated electromagnetic, mechanical and thermal conditions of the windings in accidental cases of short-circuit and lightning impulse, and considered the winding structure withstanding the severe loads. We constructed a small-sized model coil of Bi-2223 Ag/Mn-sheathed tapes and confirmed applicability of the design concept for the over-current and high-withstand-voltage tests. We designed and constructed a single-phase HTS transformer on the basis of the model-coil-test results. The primary and secondary windings are transposed parallel conductors of two and six Bi-2223 Ag/Mn tapes, respectively. The same tests for the HTS transformer as for usual oil-filled ones indicated the reliable operation and high performance. The field test in a distribution grid of Kyushu Electric Power Co. included inrush-current test and long-term operation of the transformer cooled by a continuous supply system of subcooled liquid nitrogen with cryocoolers.

Original languageEnglish
Pages (from-to)1578-1581
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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