An effective way to reduce AC loss of second-generation high temperature superconductors
An effective way to reduce AC loss of second-generation high temperature superconductors
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DOI：
10.1088/1361-6668/aaee05
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发表时间：
2018-11
影响因子：
3.6
通讯作者：
Mingyang Wang;Min Zhang;Meng Song;Zhuyong Li;Fangliang Dong;Z. Hong;Zhijian Jin
中科院分区：
文献类型：
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作者：
Mingyang Wang;Min Zhang;Meng Song;Zhuyong Li;Fangliang Dong;Z. Hong;Zhijian Jin
第二代（2G）高温超导（HTS）装置具有用于能量应用的高功率密度和效率。然而，在交变电流条件下，2G高温超导体中的涡流运动导致低温下的能量耗散，这显著影响效率并给冷却系统增加额外负担。这种能量耗散被识别为AC损耗。降低交流损耗以提高2G高温超导器件（如高温超导电机、电缆和故障限流器）的效率已成为一个关键的研究热点。我们在这里报告一种有效的方法，以减少交流损耗，通过使用新的2G高温超导导线。其原理是将窄的2G HTS带堆叠成导线结构，这被称为焊接堆叠方形（3S）导线。实验结果表明，采用3S线可使交流损耗降低80%以上。此外，3S线的临界电流可以很容易地调整，以适应各种应用。可以预见，3S线将成为一种强大的技术，使2G高温超导功率器件的开发具有高效率。
Second-generation (2G) high temperature superconducting (HTS) devices have high power density and efficiency for energy applications. However, in alternative current conditions, the vortex movement in 2G HTS leads to energy dissipation at low temperatures, which significantly affects efficiency and adds an extra burden to cooling systems. This energy dissipation is identified as AC loss. Reducing AC loss to improve efficiencies of 2G HTS devices, e.g. HTS machines, cables and fault current limiters, has become a key research focus. We report here on an effective way to reduce AC losses by using a new 2G HTS wire. The principle is to stack narrow 2G HTS tapes into a wire structure, which is called a soldered-stacked-square (3S) wire. Our experiments on solenoid coils have proved that the 3S wire helps to reduce the AC loss by 80%. Moreover, the critical current of the 3S wire can be easily adjusted for various applications. It is envisioned that the 3S wire will become a powerful technology enabling the development of 2G HTS power devices with high efficiency.