International Round Robin Test of Critical Current of Superconducting Cable Sample

Ten institutes from six countries participated in an international round-robin test to evaluate the critical current of a superconducting power cable made of Bi-2223 tapes.The cable design featured a two-layer inner core conductor and a singlelayer outer shield conductor.The shield layer measured approximately 40 mm in diameter, and the cable length was 2 meters.To eliminate the influence of resistive voltage drops from current transfer, voltage taps for measurement were positioned at a sufficient distance from the current terminals.The critical current was determined using the resistive method with the electric field criterion of 1.0 /.Additionally, the -value, an optional parameter reflecting the current-voltage ( - ) characteristics, was extracted from the - curve within an electric field range of 0.1 to 1.0 /.A detailed uncertainty analysis was conducted for both the critical current and the value.Finally, the paper discusses the potential for standardization of the employed resistive measurement method. Keywords-critical current