This paper studies the influence of the thermal disturbance process on the electro-thermo-mechanical properties of quasi-isotropic strand (Q-IS) in self-field. We first measured the heat transfer time as well as the longitudinal temperature distribution through experiments and compared them with simulated results. Subsequently, through the finite element analysis, the transversal distribution of the temperature in the center of the strand and the attenuation of the critical current during the thermal disturbance are obtained. Finally, with considering the uniformity of the temperature distribution, the internal stress of the strand under different operating currents was studied. The results show that compared to the strand formed by directly stacked tapes, the Q-IS has advantages of uniform temperature distribution, less attenuation of critical current, and lower amplitude of internal stress in the case of higher current.

本文研究了热扰动过程对自场准各向同性钢绞线(Q-IS)电热机械性能的影响。我们首先通过实验测量了传热时间以及纵向温度分布，并将它们与模拟结果进行了比较。随后，通过有限元分析，得到钢绞线中心温度的横向分布和热扰动过程中临界电流的衰减情况。最后，考虑温度分布的均匀性，研究了不同工作电流下钢绞线的内应力。结果表明，与直接叠带形成的绞合线相比，Q-IS具有温度分布均匀、