Study on reduction of steady-state impedance in magnetic shielding type superconducting fault current limiter

A magnetic shielding type superconducting fault current limiter (MSFCL) has undesirable leakage impedance and thus the voltage drop relating to the leakage impedance occurs in the steady-state operation (the standby condition of a fault). Therefore, this paper proposes a divided MSFCL model to reduce the value of the leakage impedance in the steady-state operation. The four-divided model of MSFCL was actually constructed. Then experiments were carried out to demonstrate the advantage of the divided model. Moreover, the divided model was compared with a non-divided model with the same turns of the coils. We confirmed the advantage of the divided model through these experiments.