Evaluation on Current-Limiting Performance With the Fault Type of the 3-Phase Resistive Type SFCLs

Ground fault accounts for 70 to 80% of accidents in power systems. Failure to prevent ground fault at an early stage could lead to damage on other power equipment through the generation of abnormal voltages in the nominal lines. Therefore, it is very important to prevent ground fault at an early stage. This study performed the application tests of the fault currents for ground faults caused by the single-line-to-ground, double-line-to-ground, or triple-line-to-ground according to the fault types to develop the superconducting current-limiting elements and to evaluate the current-limiting capabilities. From the results, the current-limiting characteristics by the ground fault types were determined by the difference between the level of the fault current, which was applied at the fault point of R-phase 0° defined as the fault standard in the test, and the time of the quenching initiation of each phase.