高柔度YBCO电缆弯曲性能分析

IF 5.6 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Huan Jin , Qiong Wu , Guanyu Xiao , Chao Zhou , Haihong Liu , Yunfei Tan , Fang Liu , Jinggang Qin
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引用次数: 1

摘要

为了利用高温超导钇钡铜氧化物(YBCO)带开发用于高磁场应用的超导电缆,确保YBCO电缆在具有挑战性的机械和热条件下稳定运行至关重要。提出了一种新型电缆,其特点是将YBCO和铜带缠绕在螺旋不锈钢管上,以增加灵活性和冷却能力。实验证实其临界电流随弯曲直径的变化而变化。用九个YBCO带缠绕在三层中的电缆在弯曲直径为30mm时显示出小于5%的临界电流退化。电缆的性能随着缠绕层数量的增加而降低。在弯曲直径为30mm的情况下,由五层15条带缠绕的电缆样品的临界电流退化达到约12%。此外,与传统的CORC电缆试样相比,开发的电缆试样显示出更好的弯曲灵活性,并实现了更低的临界弯曲直径。有限元模型表明,不锈钢螺旋管较高的弹性系数和较低的塑性导致HFRC电缆YBCO带上的应变低于CORC电缆,并且HFRC电缆的YBCO带的最大应变仅为CORC电缆的10%左右。因此,这种电缆中的YBCO带在弯曲过程中不太可能达到不可逆应变极限,从而导致载流性能下降。此外,通过使冷却介质在中心芯内部流动,可以提高冷却效率,这可以显著提高其热稳定性。这些优点表明了在未来的强场磁体中使用它的可能性,该磁体在大于15T的场下具有高载流容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bending performance analysis on YBCO cable with high flexibility

In order to utilize high-temperature superconducting Yttrium Barium Copper Oxide (YBCO) tapes to develop superconducting cables for high magnet field applications, it is critical to ensure the stable operation of the YBCO cable under challenging mechanical and thermal conditions. A new type of cable featuring the winding of YBCO and copper tapes around a spiral stainless steel tube has been proposed to increase flexibility and cooling. Experiments are performed to confirm that its critical current varies with the bending diameter. The cables wound with nine YBCO tapes in three layers show a critical current degradation of less than 5% for a bending diameter of 30 mm. The performance of the cable degrades as the number of wound layers increases. The critical current degradation of cable specimens wound from 15 tapes in five layers reached approximately 12% for a bending diameter of 30 mm. In addition, when compared to traditional CORC cable specimens, the developed cable specimens show better-bending flexibility and achieve a lower critical bending diameter. The finite element models show that the higher elasticity coefficient and lower plasticity of the stainless steel spiral tube results in a lower strain on the YBCO tapes of the HFRC cable than that of the CORC cable, and the maximum strain on the YBCO tapes of the HFRC cable was only about 10% of that of the CORC cable. Therefore, it is less likely that the YBCO tape in this type of cable will reach the irreversible strain limit during bending, resulting in a degradation in current carrying performance. Furthermore, the cooling efficiency can be improved by flowing the cooling medium inside the central core, which can significantly improve its thermal stability. These advantages indicate the possibility of using it in future high-field magnets with high current carrying capacity at fields greater than 15 T.

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