Influence of Interface Resistance on Current Distribution and Inhomogeneity Effect on Quench Characteristics in REBCO Coated Conductor

Abstract

Resistive type superconducting fault current limiter (R-SFCL), based on REBCO coated conductor, is of great help to enhance the safety and stability of power system. When the fault current appears, the current is transferred from the superconducting layer to the metal layers with large resistance in the REBCO coated conductor, so as to limit the current. However, the interface resistance affects the current distribution between different metal layers. What’s more, the inhomogeneity effect of REBCO coated conductor has great influence on the quench characteristics of R-SFCL. In this article, the current transfer model of REBCO coated conductor is established, and the influence of interface resistance on current distribution is analyzed. The inhomogeneity effect of resistivity parameters and critical current of REBCO coated conductor is analyzed. One non-inductive bifilar coil is fabricated for DC impulse current test, and the influence of inhomogeneity effect of REBCO coated conductor on quench characteristics is verified.