Magnetic characteristics of a high-T-c superconducting cylinder for magnetic shielding type superconducting fault current limiter

The superconducting fault current limiter (SCFCL) is expected to be the fir st application of high-T-c superconductors (HTSs) in power systems. To deve lop a magnetic shielding type superconducting fault current limiter, we hav e carried out some fundamental experiments concerning the magnetic shieldin g characteristics of an HTS bulk cylinder. In this paper, the experimental results of magnetic flux penetration into a Bi(2223) cylinder are shown. AC magnetic field is applied to the sample by a primary winding (copper coil) excited by AC triangular- and sinusoidal-waveform currents in the frequenc y range of 0.1 Hz to 100 Hz, We also developed a Finite Element Method (FEM ) computer program for evaluation of the dynamic electromagnetic behavior o f the HTS cylinder in a time-varying external magnetic field. The results o f computer simulations considering the voltage-current (E-J) characteristic are compared with experiments.