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

• The H formulation with contact resistivity is used to simulate the AC loss and electromagnetic behavior of Q-IS. The contact term can be incorporated into the classical H formulation through its weak contribution. • 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 subjected to an alternating external field, the magnetization losses of Q-IS exhibit a log-linear increase as the amplitude of the external magnetic field ranges from 0.01 to 0.2 T. • When Q-IS is simultaneously influenced by both the transport current and the external magnetic field, the distributions of both current density and magnetic field exhibit a distinct asymmetry. 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.