Impacts of a Flux-coupling SFCL on the overcurrent protection for distribution system with infeed

Abstract

With the rapid development of distribution system and the integration of distributed generations, the increasing fault current is threatening electrical equipment of the power grid. The superconducting fault current limiter (SFCL) is an effective solution to dealing with the large fault current in the distribution network. In this work, the characteristics of the current limiting impedance of the flux-coupling SFCL is presented. The impacts of the flux-coupling SFCL on the overcurrent protection for distribution system with and without infeed is analyzed. Furthermore, a simulation model of a real 10 kV distribution system with a flux-coupling SFCL is built to verify the analysis. This work is of significance to the coordination between a flux-coupling SFCL and the overcurrent protection for distribution system.