Comparative study on the fastest effective fault limitation for stabilized and stabilizer-free high Tc superconductors

The fastest effective fault limitation is one of the selection criterion of high T-c superconductors (HTS) for resistive type fault current limiter (R-SFCLs) application. In the present work, we have given a comparative DC & AC performance study on HTS tapes with and without stabilizer. At first, we have investigated the temperature dependent DC resistivity of the SS stabilized Bi2223 based conductor, Cu (50 mu m substrate) and SS (75 mu m substrate) stabilized YBCO based coated conductors (CCs) and compared with the stabilizer free YBCO based CC (50 mu m and 100 mu m substrate). We have studied the DC transport properties (E-I) of the stabilized and stabilizer-free tapes to obtain flux-flow resistance before reaching normal state, critical current and 'n' factor at 1 mu V/cm criterion. Further, the 1st peak limitation, response time and resistance attained during fault limitation have been compared for AC over-current pulses of 1.5 kA for 100 ms duration. The aforesaid measurements helped us to select a suitable high T-c superconductor for fastest effective fault limitation to be used in R-SFCL application. (C) 2017 Elsevier B.V. All rights reserved.