ABSTRACT
Superconducting fault current limiters (SFCL) have been successfully demonstrated to effectively curb electric faults. This chapter provides a comprehensive overview of the existing SFCL technology. All major types of SFCLs will be introduced, including the most popular resistive and saturated-core SFCL, as well as magnetic-shielded, coreless, transformer, flux-lock, bridge, resonance, and novel hybrid SFCLs. Resistive SFCLs have simple structure and they respond to faults automatically. Iron cores are essential for saturated-core and magnetic-shielded SFCLs, which enable quick response to fault with a significant increase of impedance. Due to the existence of different types of three-phase faults, a new type three-phase SFCL was designed to solve both symmetrical faults as well as unsymmetrical faults. In unsymmetrical faults such as single-line-to-ground faults, the three-phase balance is lost, and the magnetic flux in the iron core is not zero any more.
