Transient electrical and thermal responses of a 2-section BSCCO-2223 coil under overcurrent pulses

This paper presents experimental and numerical simulation results of a 2-se ction coil subjected to overcurrent pulses in the temperature range 20-60 K The experiment simulates a high-temperature superconducting (HTS) magnet f or electric devices such as fault-current limiters, transformers, motors! a nd power lines under fault-mode overcurrent pulses, Each section of the tes t coil is layer-wound with Bi-2223/Ag composite tape, 3.5-mm wide and 0.23- mm thick, with the outer section wound directly over the inner section. A p ulse current exceeds the critical current of each conductor and may drive e ach section normal, A constant current that follows the pulse current leave s each section in three possible conditions: completely superconducting, re covering, and quenching. Simulation agrees reasonably wed with experiment.