缺陷条件下高温超导直流线圈稳定性研究

摘要

在高温超导带材生产及线圈制作的过程中,会不可避免的存在缺陷.缺陷区域的带材性能退化,表现为临界电流Ic与n值下降;极端情况下超导结构被完全破坏,呈现出非超导的阻性区.线圈工作时在阻性区会出现焦耳热,若热量不能有效地传出,温度会持续上升直到带材烧毁出现失超事故.在假设线圈退化情况的条件下,利用有限元仿真的方法,对不同热环境下带材退化对线圈温度的影响进行了研究,得出了不同热环境与区域退化下线圈的最大稳定工作电流.%There always exists defects in the process of production of High Temperature Superconducting(HTS) tapes and coils.The defects result in the performance degradation presented as the declines of Ic and n value.In an extreme situations,and the non-superconducting resistive areas exhibit in the coils.The Joule heat is generated in resistive areas while the coils are operating.If the heat is not transferred effectively,the temperature will keep rising and lead to burn out of the coil.In this paper,the Finite Element Analysis (FEA) was used to simulate the thermal stability of the HTS coil with different degradation conditions.The maximum safe operating currents were gained in different thermal and degradation conditions.