非均匀高温超导带材对CORC电缆失超特性的影响研究  

Influence of Non-Uniform High Temperature Superconducting Tapes on Quench Characteristics of CORC Cable

作　　者：李显皓 徐颖[1] 任丽[1] 唐跃进[1] 彭思思 Li Xianhao;Xu Ying;Ren Li;Tang Yuejin;Peng Sisi(State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology,Wuhan 430074 China;Wuhan Institute of Marine Electric Propulsion,Wuhan 430070 China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),武汉430074 [2]武汉船用电力推进装置研究所,武汉430070

出　　处：《电工技术学报》2022年第19期5044-5055,共12页Transactions of China Electrotechnical Society

基　　金：GF科技重点实验室基金资助项目(6142217210207)。

摘　　要：高温超导CORC(conductor on round core)电缆失超时的热负荷严重威胁了低温系统和电缆本体的安全稳定运行。受微米级超导薄膜制备工艺等的影响,CORC电缆并绕的多根高温超导带材不均匀。为分析不均匀临界电流对CORC电缆失超特性的影响,该文搭建了基于三维TA方程的有限元模型。以降维的带材曲面为求解区域,以等效的电流密度为求解变量,失超模型在同一几何中表达超导和常导两种属性,构建电流和电势两种约束。在导体域建立降维的热模型,用以考虑损耗和传热的影响;在全局建立等效的电路模型,用以控制并联导体的分流。进一步地,耦合模型考虑温度依赖的接头电阻以模拟CORC电缆带材的烧断和电流的突变。结果表明,非均匀高温超导带材影响了电流重分配的动态响应,加快了局部失超的发展过程。The thermal load of the high temperature superconducting(HTS) CORC cable during quenching threatens the safe and stable operation of the cryogenic system and the cable body. Affected by the preparation process of micron-scale superconducting thin films, multiple HTS tapes wound in parallel with the CORC cable are not uniform. To analyze the influence of non-uniform critical current on quench characteristics of CORC cables, a finite element model based on the three-dimensional T-A formulation was built. Taking the reduced-dimensional tape surface as the solution area and the equivalent current density as the solution variable, the quench model expressed two properties of superconductivity and normal-conductivity, and constructed two constraints of current and potential in the same geometry. A reduced-dimensional thermal model was established in the conductor domain to consider the effects of loss and heat transfer;an equivalent circuit model was established globally to control the current redistribution. Further, the coupled model considered the temperature-dependent terminal resistance to simulate the burnout of tape and abrupt changes in current. The simulation results show that non-uniform HTS tapes affect the dynamic response of current redistribution and accelerate the development of local quench.

关 键 词：高温超导CORC电缆 局部失超 不均匀性 临界电流 有限元法 

分 类 号：TM26[一般工业技术—材料科学与工程]