无绝缘高温超导线圈失超特性数值模拟研究

Numerical simulation of quench characteristics of no-insulated HTS coils

无绝缘高温超导线圈因其良好的电热稳定性和自保护特性得到广泛应用,但其在高场超导磁体的应用过程中存在失超保护安全边界性问题。针对无绝缘高温超导线圈,利用高温超导线圈等效电路网格模型,建立了无绝缘高温超导线圈失超传播的电、磁、热多物理场耦合模型,基于MATLAB商业软件采用数值模拟方法得到了不同导热环境下及不同外加磁场强度下无绝缘高温超导线圈失超过程中的电压、温度、磁场的分布规律。研究结果表明,局部失超发生时,绝热环境下的线圈失超传播范围广且恢复时间长,线圈呈现先匝内后匝间的失超传播规律,失超电压和磁场与失超匝数直接相关。

No-insulated HTS(high-temperature superconducting)coils have been widely used because of their characteristics of good thermal stability and self-protection,but there is quench protection safety boundary in the application of high field superconducting magnets.For no-insulated HTS coils,an equivalent model of partial circuit of HTS coils was used to establish a coupling model of electrical,magnetic and thermal fields for the quench propagation of no-insulated HTS coils.Based on MATLAB,the distribution laws of voltage,temperature and magnetic field in the quench process of uninsulated HTS coil under different heat conduction environments and different external magnetic field intensities were obtained by numerical simulation.The research results indicate that when local quench occurs,the propagation range of coil quench in an adiabatic environment is wider and the recovery time is longer.The quench of the coil exhibits a propagation pattern of first in turn and then between turns.The quench voltage and magnetic field are directly related to the number of quench turns.