| Title |
Operating Characteristics of Superconducting Fault Current Limiters Connected in Series by Shunt Resistors |
| Authors |
현옥배(Hyun, Ok-Bae) ; 최효상(Choi, Hyo-Sang) ; 김혜림(Kim, Hye-Rim) ; 임해룡(Lim, Hae-Ryong) ; 김인선(Kim, In-Seon) |
| Keywords |
Superconducting fault current limiter ; YBCO thin film ; Simultaneous quench ; Shunt resistance |
| Abstract |
We fabricated resistive superconducting fault current limiters (SFCL) based on YBCO thin films grown on 2-inch diameter Al_2O_3 substrates. Two SFCLs with nearly identical properties were connected in series to investigate simultaneous quench. There was a slight difference in the rate of voltage increase between two SFCL units when they were operated independently. This difference resulted in significantly imbalanced power dissipation between the units. This imbalance was removed by connecting a shunt resister to an SFCL in parallel. The appropriate values of shunt resistance were 80 {Ω} at 75 V_rms and 110 {Ω} at 120 V_rms, respectively. Increased power input at high voltages also reduced the initial imbalance in power dissipation, but with increase in film temperature to higher than 200 K. |