Quench and recovery behaviors of Bi-2223/Ag HTS tapes under pulsed over-currents with different durations

Under pulsed over-currents with different durations, quench and recovery behaviors of Bi-2223/Ag HTS tapes have been observed. The experiment is carried out using a pulsed circuit. The HTS tapes are immersed in liquid nitrogen bath. The durations of the pulsed currents fed to HTS tapes are 2.78 ms, 1.97 ms, 1.58 ms, 1.22 ms, 1.11 ms and 0.91 ms, respectively. In order to confirm the critical current of the tapes, DC current is fed to the tapes firstly. The magnitude of the pulsed currents is about 100 A, which is about three times of the critical current of the tapes. The experimental result shows that the normal voltage generated by the over-current disappears fast after the end of the pulsed over-current. As the duration of the pulsed current decreases, the quench and recovery current tends to increase, and larger than the critical current of the tapes, which show that HTS tape has a good superconducting-to-normal conducting recovery characteristic under pulsed current with short duration. These results show that the application of HTS tapes for future pulsed power would be very promising.