Steady-state Operation Tests of Magneto-biased Superconducting Fault Current Limiter (MBSFCL) on a 66kV Power Substation in China

The level of fault current grows rapidly as more and more distributed renewable energy is connected to the grid in recent years. With the aims of preventing the growing levels of fault current in power grid and addressing the drawbacks of conventional relay protection, superconducting fault current limiter (SFCL) with fast current-limiting response, low loss and quick recovery time is being developed to tackle the challenges. Herein, a design and prototype of a magneto-biased SFCL (MBSFCL) with two-stage fault current limiting capability is presented. The grid-connected test of the MBSFCL prototype has been carried out in a 66 kV power substation . The results are obtained by AC withstand voltage test and a 7-day steady-state operation test of MBSFCL, which verify the feasibility of MBSFCL in grid application.