Fast Identification of Short Circuit Fault Based on Average Curvature of Current Waveform

Using fault current limiter (FCL) is an effective way to solve the problem that short circuit current exceeds the standard. How to quickly identify short circuit faults is one of the keys. Thus, this paper presented a fast identification method for short circuit fault based on the average curvature of current waveform. A simple fault current limiter system was built in PSCAD, and the method was studied. The results show that it is faster than using current instantaneous value or the current change rate as the criterion. In view of the situation that the average curvature may exceed when the load changes sharply. It was proposed that the average curvature and the current change rate could be used as the combination criterion, and the fault could be identified quickly and accurately too.