Investigation on Thermal Stability of Quasi-isotropic Superconducting Strand Stacked by 2mm Wide REBCO Tapes and Cu Tapes

In order to improve the thermal stability of high-temperature superconducting (HTS) strand, a quasi-isotropic superconducting strand (Q-IS) stacked by 2 mm wide REBCO tapes and Cu tapes with geometrical symmetric configuration were developed, in this paper. A three dimensional (3D) numerical model considering the anisotropic thermal conductivity was built to study the thermal stability of the strand, including minimum quench energy (MQE) and quench propagation velocity (QPV). The temperature distribution in the cross section at different positions along the longitudinal direction of the strand during the quench was obtained as well. Then, a strand was prepared to investigate the thermal stability experimentally. Results show that the Q-IS stacked by REBCO tapes and copper tapes has higher MQE than Q-IS without copper tapes. The results can provide a fundamental analysis for further developing device of high-current electric power transmission with high thermal stability.