Quench detection and protection of cryocooler-cooled YBCO pancake coil for SMES

Hiroshi Ueda, Atsushi Ishiyama, Kazuki Muromachi, Takahiro Suzuki, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


In this paper, we focus on the quench detection and protection of a cryocooler-cooled pancake coil for SMES wound with a YBCO bundle conductor composed of laminated electrically insulated YBCO-coated conductors. Because the normal-zone propagation velocity is much slower in a high-temperature superconducting (HTS) coil than in a low-temperature superconducting (LTS) coil, the detection of the non-recovering normal zone using a voltage signal is quite difficult. Quench detection is considered to be more difficult during SMES operation because of the noise of the converter or other equipment. Therefore, a quench must be detected using some other method. In the previous paper, we showed that a quench in the coil could be detected by observing the transposition of the current in the bundle conductor caused by local normal transition. In this paper, based on this quench detection method, we investigate the transposition of current and the thermal behavior during the quench detection and the dumping of the stored energy by an external resistance in coils wound with a YBCO laminated bundle conductor for SMES and determine the appropriate stabilizer thickness of the YBCO-coated conductors.

Original languageEnglish
Article number4702804
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2012
Externally publishedYes


  • Normal propagation
  • YBCO bundle conductor
  • protection
  • stability

ASJC Scopus subject areas

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


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