期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 17, 期 4, 页码 3874-3879出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2007.910162
关键词
alternating current (ac) quench; AC losses; minimum quench energy (MQE); normal zone propagation velocity; YBa2Cu3O7 tape
Alternating current (ac) loss and quench behavior measurements were performed on a YBa2Cu3Ox, coated conductor at 45 K. The minimum quench energies (MQEs) and the quench propagation velocities were measured as a function of transport current and frequency. AC losses were measured at the corresponding temperature and frequencies to quantify the internal thermal load during ac quench measurements. It was found that the direct current (dc) and ac quench behavior are similar, but that the MQE for de experiments is higher than the corresponding ac cases. This difference is not seen in the normal zone propagation velocity data, indicating that the difference in MQE is minimal if the ac losses are included in the energy calculation. The ac experiments show that the MQE and propagation velocity varies weakly with frequency.
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