Numerical simulation in quasi-isotropic strand by the H formulation with contact resistivity

The quasi-isotropic strand (Q-IS) is a type of high-temperature superconducting (HTS) cables, which has the excellent electromagnetic and mechanical properties. In this paper, the H formulation with contact resistivity is employed to simulate the electromagnetic behavior of Q-IS. To validate the reliability of the model, a comparison between the numerical results from our model and experimental data from the literature is presented, which are in qualitative agreement. When the Q-IS is subjected to either a transport current or an alternating external magnetic field alone, the distribution of both current and magnetic field is symmetric. Particularly, when the Q-IS is exposed to the alternating external magnetic field, the magnetization losses of Q-IS show a log-linear increase. However, when both the transport current and external magnetic field are applied simultaneously, the losses of Q-IS no longer increase log-linearly with changes in the external field amplitudes. Additionally, the distribution maps of current and magnetic field exhibit a noticeable asymmetry.