Validation of the high performance conduction-cooled prototype LTS pulse coil for UPS-SMES

Toshiyuki Mito, Akifumi Kawagoe, Hirotaka Chikaraishi, Ryuji Maekawa, Kagao Okumura, Ryo Abe, Tomosumi Baba, Tsutomu Hemmi, Masataka Iwakuma, Mitsuhiro Yokota, Hideki Ogawa, Yoshitaka Morita, Kenji Yamauchi, Atsuko Kuge, Fumio Sumiyoshi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A conduction-cooled low temperature superconducting (LTS) pulse coil has been developed as a key technology for UPS-SMES. We have been developing a 1 MW, l s UPS-SMES for a protection from a momentary voltage drop and an instant power failure. A conduction-cooled LTS pulse coil has excellent characteristics, which are adequate for a short-time uninterruptible power supply (UPS). The LTS coil has better cost performance over the HTS coil at present and the conduction cooling has higher reliability and easier operation than the conventional cooling schemes such as pool boiling with liquid helium or forced flow of supercritical helium. To demonstrate the high performances of the LTS pulse coil, we have fabricated a prototype coil with stored energy of 100 kj and have conducted cooling and excitation tests. The successful performance test results including current shut-off test with a time constant of 1.3 s and repeated excitation of a triangular waveform with high ramp rate are reported.

Original languageEnglish
Article number1642922
Pages (from-to)608-611
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
Publication statusPublished - Jun 2006

All Science Journal Classification (ASJC) codes

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


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