二代高温超导带材失超特性研究  

Study On Quench Characteristics of Second-Generation High Temperature Superconducting Tapes

作　　者：杨志星 任丽[1] 徐颖[1] 段璞 李鑫[1] Yang Zhixing;Ren Li;Xu Ying;Duan Pu;Li Xin(State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,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

出　　处：《电工技术学报》2024年第1期110-120,153,共12页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2018YFA0704300)。

摘　　要：高温超导带材失超会降低其通流能力,从而影响高温超导装置的运行稳定性。目前,高温超导带材失超仿真模型多为二维计算模型,无法准确模拟其失超过程中的电磁热行为。该文采用有限元方法对二代高温超导带材失超特性进行多物理场耦合分析。在三维直角坐标系下,以磁场强度矢量为求解变量,建立了二代高温超导带材失超演化电磁热仿真模型,研究了二代高温超导带材长度方向与宽度方向在不同热扰动工况下的电磁热特性及其演化过程,分析了高温超导带材过电流失超过程中的各层分流状况与超导层电阻率变化行为,区分了不同类型的过电流失超行为,并提出了高温超导带材过电流冲击失超的电阻率判据。The quench of high temperature superconducting(HTS)tapes will reduce their flow capacity and thus affect the operation stability of high temperature superconducting devices.At present,most simulation models of superconducting tapes are two-dimensional models,which cannot accurately simulate the electromagnetic-thermal behavior in the process of quench.A finite element method with multiple physical field coupling is used to study the quench characteristics of the second-generation high temperature superconducting tapes.In the three-dimensional coordinate system,the magnetic field intensity vector is taken as the solution variable to establish the second-generation HTS tape quench evolution electromagnetic-thermal simulation model.The electromagnetic-thermal characteristics and evolution under different thermal disturbance conditions of the second-generation HTS tapes along the length direction as well as the width direction are studied.The shunt state of each layer and the resistivity change behavior of the superconducting layer in the process of superconducting tapes overcurrent are analyzed,different types of overcurrent and overcurrent behaviors are distinguished,and the resistivity criterion of overcurrent quench is proposed.For the superconducting tapes studied in this paper,the minimum quench energy is 4.62 J and the propagation velocity is 0.96 cm/s when I_(op)=0.6I_(c).When the local heat energy is 1.82Q_(mq),the temperature of tape stays above critical temperature for a short time after the thermal disturbance ends,and the tape stays quenching.When the local heat energy is 3.9Q_(mq),during the thermal disturbance the maximum current density region of the superconducting layer diffusing to other regions,the hot region changes from superconducting state to resistive state,and propagates symmetrically along the tapes.After 2 s,the quench region expands to twice the quenching region than the initial stage of the thermal disturbance.According to the overcurrent degree,duration and the shunt condition of high t

关 键 词：二代高温超导带材 失超特性 有限元 电磁热耦合 

分 类 号：TM26[一般工业技术—材料科学与工程]