Simulation Analysis and Steady-State Operation Tests of Magneto-Biased Superconducting Fault Current Limiter on a 66 kV Power Substation in China

In recent years, the influx of distributed renewable energy sources and electric vehicle charging stations has led to a surge in fault current levels on the grid. In response to this trend and the shortcomings of traditional breaker systems, the superconducting fault current limiter (SFCL) has emerged as a promising solution. Its rapid current-limiting response, minimal energy loss, and swift recovery time make it a powerful tool in addressing these challenges. Here, we introduce a magneto-biased SFCL (MBSFCL) design and prototype, boasting a two-stage fault current limiting capability. Prior to its deployment and operation in the grid-connected test platform, a 66 kV power substation, we conducted simulation analysis to assess its current limiting rate, quench resistance, and operating temperature. The results of AC withstand voltage tests and a seven-day steady-state operation test validate the practical applicability of the MBSFCL for grid integration.