Analysis on protection coordination of protective devices with a fault current limiter in the application location of a dispersed generation

As one of the solution of the increase problem of the fault current in a power system, the superconducting fault current limiter (SFCL) has been noticed as the attractive device because it has no power loss in a normal time and can limit the fault current rapidly without additional device to detect the fault current. However, the introduction of the SFCL in a power distribution system affects the protection coordination between the existing protective devices such as the over-current relay (OCR) and the recloser, which causes the operation of the protective devices to get out of their original setting values. Therefore, the analysis on the effect of the SFCL introduction on the existing protective devices is required and the method to keep the protection coordination between the protective devices in a power system with the SFCL should be first considered. In this paper, the protection with a SFCL due to application location of a DG in power distribution system was analyzed. The lower resistance generation of the SFCL due to the decrease of the feeder current in case that the DG was applied into the middle point of the fault feeder was analyzed.