Performance analysis of flux-lock type SFCL influenced by characteristics of two coils

Abstract

The fault current limiting performance of flux-lock type High Temperature Superconducting Fault Current Limiter (HT-SFCL) is largely determined by the characteristic of the two coils on the iron core, including the direction of the windings, number of turns, the coupling coefficient, etc. In this paper the fundamental working principle of the flux-lock type SFCL is analyzed, considering parameters such as the iron core structure, the coils and HTS material characteristics. Then by means of PSCAD/EMTDC, the time domain model of SFCL is presented based on the theoretical analysis. Finally, simulations focusing on the coils characteristics are developed to analyze their impacts on SFCL's current limiting performance.