In this paper, the electro-thermal coupling calculation of 2G HTS tapes are carried out through theoretical analysis and finite element simulation to analyze the temperature change and heat accumulation process of tapes during DC impact, and the influence of the reinforcement layer on the thermal stability of 2G THS tapes at impact is studied. The temperature change and quenching of superconductivity recovery process of 2G HTS tapes were measured at different impulse current amplitudes and impulse times. For superconducting cables with clad insulation, the heat generated during a short-circuit shock will be absorbed mainly by the 2G HTS tapes at the beginning and will be gradually conducted out only after a few seconds. Since superconducting cables often use a thicker copper reinforcement layer, their thermal stability is also relatively high, which is more conducive to enhancing the stability of superconducting cables in the event of a short-circuit fault. Based on the simulation and experimental results, this paper describes the electro-thermal change law of 2G THS tapes during DC impact, and obtains the critical threshold and thermal stability boundary of 2G THS tapes, which provides the basis for the analysis and design of high temperature superconducting DC cables.

2G THS tapes; DC shock; thermal stability