Research on the Magnetic Properties of Iron Core for Saturated Iron-Core Superconducting Fault Current Limiter

The magnetic field of iron core is excited by the interaction of both direct current (dc) and alternating current for the saturated iron-core superconducting fault current limiter (SI-SFCL), which will reach a relatively high level as 2 T or above. On account of using different methods to describe the magnetic property of the iron core, the simulation results of the magnetic field and loss of iron core will be different, we use a new method to measure its magnetized characteristic, especially in saturated state. In this paper, we have studied the definition of the magnetized property for SI-SFCL under dc bias current in detail. On the basis of the experimental data of grain-oriented electrical steel, we plot the hysteresis loop and the magnetization curve of the electrical steel. The rightness of the definition is verified by using simulation analysis and experimental test. At last, the research results mentioned earlier are applied to analyze a 380-V SI-SFCL.