The working principle of saturated core superconducting fault current limiter (SCFCL) is analyzed and its electromagnetic constraint relation under normal operation is given.

The power supply is an important part of the superconducting magnet system, it affords both steady current and reliable protection for the superconducting magnet system.

The superconducting fault current limiter (SFCL) can limit current and realize to control the voltage dip in non-faulted line.