Degradation of YBCO coated conductors due to over-current pulse

Atsushi Ishiyama, Yasutake Tanaka, Hiroshi Ueda, Yuh Shiohara, Takato Machi, Yasuhiro Iijima, Takashi Saitoh, Naoji Kashima, Masami Mori, Tomonori Watanabe, Shigeo Nagaya

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

For HTS (High-Temperature Superconductor) applications to electric power devices, superconductors are subjected to short-circuit fault currents 10 to 30 times the normal operating current. These over-currents will drive the HTS conductors normal and degrade or burn-out the HTS conductors. Therefore it is important to establish a novel thermal stability criterion for over-current pulse drive. In this study, we carried out preliminary experiments on the damage caused by over-current pulse drive focusing on the limitation of the temperature rise without degradation. We prepared five YBCO sample tapes fabricated with IBAD/PLD and IBAD/ MOCVD methods. Measurements were performed at 60 K and 80 K (Conduction cooling with Gifford-McMahon cryocooler was adopted) in self-field. The experimental results indicated that the degradation of the sample tapes for the over-current pulse with a duration of 1 second depended on not the initial critical current Ic, but the peak temperature Tpeak. The permissible peak temperature without degradation existed at about 400-600 K. The sample tapes were also observed before and after the experiments by magneto-optic (MO) imaging to find the distribution of degradation area.

Original languageEnglish
Pages (from-to)3509-3512
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume17
Issue number2
DOIs
Publication statusPublished - Jun 2007
Externally publishedYes

Fingerprint

High temperature superconductors
conductors
Tapes
degradation
Ion beam assisted deposition
Degradation
pulses
high temperature superconductors
tapes
Magnetooptical effects
Electric fault currents
Critical currents
Metallorganic chemical vapor deposition
Stability criteria
Pulsed laser deposition
Short circuit currents
Temperature
Superconducting materials
Thermodynamic stability
Experiments

Keywords

  • Degradation
  • Over-current pulse
  • Temperature limitation
  • YBCO tape

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Ishiyama, A., Tanaka, Y., Ueda, H., Shiohara, Y., Machi, T., Iijima, Y., ... Nagaya, S. (2007). Degradation of YBCO coated conductors due to over-current pulse. IEEE Transactions on Applied Superconductivity, 17(2), 3509-3512. https://doi.org/10.1109/TASC.2007.899708

Degradation of YBCO coated conductors due to over-current pulse. / Ishiyama, Atsushi; Tanaka, Yasutake; Ueda, Hiroshi; Shiohara, Yuh; Machi, Takato; Iijima, Yasuhiro; Saitoh, Takashi; Kashima, Naoji; Mori, Masami; Watanabe, Tomonori; Nagaya, Shigeo.

In: IEEE Transactions on Applied Superconductivity, Vol. 17, No. 2, 06.2007, p. 3509-3512.

Research output: Contribution to journalArticle

Ishiyama, A, Tanaka, Y, Ueda, H, Shiohara, Y, Machi, T, Iijima, Y, Saitoh, T, Kashima, N, Mori, M, Watanabe, T & Nagaya, S 2007, 'Degradation of YBCO coated conductors due to over-current pulse', IEEE Transactions on Applied Superconductivity, vol. 17, no. 2, pp. 3509-3512. https://doi.org/10.1109/TASC.2007.899708
Ishiyama, Atsushi ; Tanaka, Yasutake ; Ueda, Hiroshi ; Shiohara, Yuh ; Machi, Takato ; Iijima, Yasuhiro ; Saitoh, Takashi ; Kashima, Naoji ; Mori, Masami ; Watanabe, Tomonori ; Nagaya, Shigeo. / Degradation of YBCO coated conductors due to over-current pulse. In: IEEE Transactions on Applied Superconductivity. 2007 ; Vol. 17, No. 2. pp. 3509-3512.
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