Study on Energy Dissipation Mechanism of HTS Tapes in the Impact and Recovery Process

High temperature superconducting (HTS) tape is the main component of superconducting fault current limiters (SFCLs). The impact and recovery characteristics of HTS tape directly affect the current limiting and fast self-recovery performance of dc SFCL. These performances will lead to the problem of stability and reliability in the power system. There are rarely studies on the impact and recovery characteristics from the view of the energy spreads between the layers within the HTS tapes and the surrounding liquid nitrogen. This article reveals the energy dissipation mechanism of HTS tape among the layers of HTS tape as well as between the HTS tapes and the external environment during short-circuit and recovery process. The impact and recovery characteristics of YBa 2 Cu 3 O 7-x (YBCO) tape have been obtained by experiments. The variations of the quenching resistance of HTS tape at different impact amplitudes and durations were gained and analyzed. Meanwhile, the E-J-B-T constitutive equation is used to describe the electromagnetic thermal coupling model in the HTS tapes. The impact and recovery processes are divided into an initial phase, a shock phase, and a recovery phase by this article. The energy dissipation paths of each phase are obtained by combining experimental and simulation results.