High-temperature superconducting (HTS) cable has the merits of high capacity and small volume in the normal operation condition. However, the fault current, which could be 10–30 times of the nominal current, gives a great challenge to its thermal stability. Due to the overcurrent, the HTS tapes will quench to resistive state and result in generating large amount of heat, which may degrade or even damage the HTS tapes. Therefore, it is of great significance to study the thermal stability of superconducting tapes. This article studies the thermal characteristics of different HTS tapes under dc overcurrent. The testing tapes are made of YBCO produced by Shanghai Superconductor (SHSC) and Samri advanced material (SAM). The thermal stability is defined as the maximum overcurrent and impact duration that a tape can withstand before getting its properties degraded. According to the testing results, the thermal stability of the HTS tape with copper reinforced layer is better than brass and stainless steel. The thicker the thickness of the tape, the better the stability. But the thermal stability of 25 $\mu \text{m}$ copper reinforced YBCO is close to 50 $\mu \text{m}$. Owing to the resistivity and specific heat capacity, with the same pulse lengths, the 150 $\mu \text{m}$ copper reinforced YBCO can be pulsed to twice the current of 25 $\mu \text{m}$.

中文翻译：

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直流过流下YBCO胶带的热稳定性分析

高温超导（HTS）电缆在正常运行情况下具有容量大、体积小的优点。然而，故障电流可能是标称电流的 10-30 倍，对其热稳定性提出了很大的挑战。由于过电流，高温超导胶带会骤冷至电阻状态并产生大量热量，这可能会降低甚至损坏高温超导胶带。因此，研究超导带材的热稳定性具有重要意义。本文研究了直流过电流下不同 HTS 胶带的热特性。测试胶带由上海超导（SHSC）和三日先进材料（SAM）生产的YBCO制成。热稳定性定义为胶带在性能下降之前可以承受的最大过电流和冲击持续时间。根据测试结果，带铜增强层的高温超导胶带的热稳定性优于黄铜和不锈钢。胶带的厚度越厚，稳定性越好。但热稳定性为 25$\mu \text{m}$ 铜增强YBCO接近50 $\mu \text{m}$. 由于电阻率和比热容，在相同的脉冲长度下，150$\mu \text{m}$ 铜增强 YBCO 可以脉冲到 25 倍的电流 $\mu \text{m}$.