Speaker
Description
The contact resistance of non-insulation high-temperature superconducting (NI HTS) coils is an important parameter to characterize their thermal stability. While numerous discharging experiments have demonstrated that the contact resistance of NI HTS coils is not constant, the real-time evaluation of its transient behavior remains insufficiently explored. This paper proposes a novel inverse modeling strategy for the contact resistance of NI HTS coils, based on macroscopically measured coil voltage and central magnetic field. The numerical model implemented in COMSOL, integrates equivalent circuit and finite element methods, using the measured coil voltage and magnetic field as inputs to output the real-time contact resistance during the transient process. The results demonstrate that the contact resistance exhibits nonlinear variations during these processes, significantly affecting the time constant. The inverse modeling approach proposed in this study provides valuable insights into evaluating the real-time contact resistance during the transient process of NI HTS coils.
