Abstract
Power system transmission line protective relays are supervised by a number of elements to ensure the security and selectivity of protection decisions. Supervising elements are important for fault direction determination and they are typically designed based on the properties of sequence currents and voltages. Superconducting fault current limiters (SFCLs) could potentially affect the profiles of sequence currents and voltages, which could have further influence on the performance of supervising elements. This article is one of the first works that investigate the impact of resistive SFCLs on supervising elements in power system transmission line protection. A resistive SFCL and an electric power system are modeled in an electromagnetic transients simulation program. Single-line-to-ground faults are simulated on the transmission line. The acquired fault voltages and currents are processed by a transmission line impedance-based protective relay model to investigate the responses of supervising elements. The results are analyzed and discussed.