TY - JOUR
T1 - Quench detection and protection of cryocooler-cooled YBCO pancake coil for SMES
AU - Ueda, Hiroshi
AU - Ishiyama, Atsushi
AU - Muromachi, Kazuki
AU - Suzuki, Takahiro
AU - Shikimachi, Koji
AU - Hirano, Naoki
AU - Nagaya, Shigeo
N1 - Funding Information:
Manuscript received September 08, 2011; accepted October 30, 2011. Date of publication November 03, 2011; date of current version May 24, 2012. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as the Technological Development of Yttrium-based Superconducting Power Equipment.
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - Normal propagation
KW - YBCO bundle conductor
KW - protection
KW - stability
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U2 - 10.1109/TASC.2011.2174578
DO - 10.1109/TASC.2011.2174578
M3 - Article
AN - SCOPUS:84862530716
SN - 1051-8223
VL - 22
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 3
M1 - 4702804
ER -