Detection of temperature rise in YBCO coil by time-frequency visualization of AE signals

N. Nanato

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The normal zone propagation velocities in the high TC superconductors are slow at the high operation temperature and therefore the local and excessive temperature rise generates when the superconducting-to-normal transition occurs, and then the superconductors are degraded or burned. Therefore it is essential to detect the temperature rise in the high TC superconducting coils as soon as possible to protect the coils. In general, the temperature rise can be detected by many voltage taps and thermocouples, however, the taps and thermocouples make the electric insulation of the windings degraded. The author has presented the time-frequency visualization of AE signals as a method to detect the temperature rise with non electric contact and the usefulness for Bi2Sr2Ca2Cu3Ox (Bi2223) superconductors has been presented. In this paper, the usefulness of the proposed method for YBa2Cu3Ox (YBCO) superconductors is verified and the experimental results show that the proposed method can detect the temperature rise in a YBCO coil.

Original languageEnglish
Pages (from-to)1808-1810
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - Oct 15 2009

Keywords

  • AE
  • Temperature rise
  • Time-frequency visualization
  • Wavelet transform
  • YBCO superconductors

ASJC Scopus subject areas

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

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