Experimental Analysis of Quench Characteristic in HTS Tapes and Coils

Normal zone propagation velocity (NZPV) and minimum quench energy (MQE) are the important parameters for quench protection of superconducting magnets. In this research, a series of experiments were conducted on single-length conductor, small coils, and parallel double conductors made of YBCO and BSCCO high-temperature superconducting (HTS) tapes at the liquid nitrogen temperature, and their normal zone propagation velocities and minimum quench energies were tested and analyzed. The experimental results show that the NZPVs of HTS single-length tape, parallel double tapes, and coils are closely related to the critical current ratio i of HTS tapes. When i is in a certain range, the NZPV is approximately proportional to i, and similarly, MQE is inversely proportional to i.