TY - JOUR
T1 - Quench Detection Criteria for YBa2Cu3O7-δ Coils Monitored via a Distributed Temperature Sensor for 77 K Cases
AU - Zhou, Jun
AU - Chan, Wan Kan
AU - Schwartz, Justin
N1 - Funding Information:
Manuscript received April 10, 2017; revised January 24, 2018; accepted February 26, 2018. Date of publication March 14, 2018; date of current version April 6, 2018. This work was supported in part by the National Natural Science Foundation of China under Grant 11272139 and Grant 11421062 and in part by the China Scholarship Council Foundation under Grant 201306185002. This paper was recommended by Associate Editor L. Chiesa. (Corresponding author: Jùn Zhou.) J. Zhou is with the Key Laboratory of Mechanics on Disaster and Environments in Western China attached to Ministry of Education of China, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China, and also with the Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695 USA (e-mail:,zhoujun@lzu.edu.cn).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2018/8
Y1 - 2018/8
N2 - Distributed temperature sensing (DTS), such as Rayleigh-scattering interrogated optical fiber (RIOF) sensing, is a promising method for detecting quenches in high-temperature superconductor (HTS) magnets. One key for the successful implementation of RIOF-based DTS for quench detection is to identify effective quench detection criteria for the onset of a quench. In this paper, two DTS-based quench detection criteria, and their dependence on the operating current and heat disturbance characteristics, are investigated through numerical simulations of quench behavior in a YBa2Cu3O7-δ (YBCO) HTS helix coil cooled by a liquid nitrogen (LN2) bath and a YBCO HTS pancake coil cooled by conduction at 77 K. One is based on the minimum propagation zone (MPZ). The reference temperature to define the MPZ size is found for different operating currents. The other is based on the equilibrium temperature profile, in which the peak temperature and a characteristic normal zone length are found from a preselected reference temperature. The advantages and disadvantages of the two quench detection criterions are discussed and compared. Simulation results show that both criteria are independent of the nature of unpredictable heat disturbances. Similar to the helix coil, equilibrium temperature profiles independent of unpredictable disturbances are found for the pancake coil with different operating currents.
AB - Distributed temperature sensing (DTS), such as Rayleigh-scattering interrogated optical fiber (RIOF) sensing, is a promising method for detecting quenches in high-temperature superconductor (HTS) magnets. One key for the successful implementation of RIOF-based DTS for quench detection is to identify effective quench detection criteria for the onset of a quench. In this paper, two DTS-based quench detection criteria, and their dependence on the operating current and heat disturbance characteristics, are investigated through numerical simulations of quench behavior in a YBa2Cu3O7-δ (YBCO) HTS helix coil cooled by a liquid nitrogen (LN2) bath and a YBCO HTS pancake coil cooled by conduction at 77 K. One is based on the minimum propagation zone (MPZ). The reference temperature to define the MPZ size is found for different operating currents. The other is based on the equilibrium temperature profile, in which the peak temperature and a characteristic normal zone length are found from a preselected reference temperature. The advantages and disadvantages of the two quench detection criterions are discussed and compared. Simulation results show that both criteria are independent of the nature of unpredictable heat disturbances. Similar to the helix coil, equilibrium temperature profiles independent of unpredictable disturbances are found for the pancake coil with different operating currents.
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U2 - 10.1109/TASC.2018.2815920
DO - 10.1109/TASC.2018.2815920
M3 - Article
AN - SCOPUS:85043774527
SN - 1051-8223
VL - 28
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 5
M1 - 8315451
ER -