DC current withstanding characteristics of superconductor

The rising rate of short-circuit current in some DC systems is very high, using superconductor in DC systems can limit the fault current quickly far before the peak value of the fault current comes. However, superconductor may be destroyed by high current or long duration current. The objective of this paper is to illustrate impacts of high current on superconductor and long duration current withstanding ability of superconductor. The research contents include the long duration current withstanding characteristic of superconductor, the quenched resistance variation characteristic and recovery characteristic of superconductor. Experimental results show that superconductor can withstand DC fault current for 70 ms and achieve microsecond level reaction.