Current Transport and Limitation Characteristics of YBCO Coated Conductor Having Different Stabilizer Connected in Series

YBCO coated conductors (CC) with high critical current density and index values are expected to be applied to superconducting power device. In particular, it is characterized by possibilities of selecting a stabilizing material surrounding YBCO CCs so that they could be applied to superconducting fault current limiters (SFCLs) and superconducting cables according to their physical properties. In this study, we conducted experiments by selecting YBCO CCs having different stabilizers of copper and stainless steel. First, we investigated the voltage-current variations with applied over-current beyond their critical currents and temperature variation generated by Joule heating. From the results, YBCO CC with copper stabilizer was more suitable for the current carrying characteristics and the CC with stainless steel showed successful current limiting properties. Finally, The 2 YBCO CCs were connected in series and electrical properties were investigated. From the results, we confirmed that the safe current carrying operation with fault current limitation could be carried out successfully.