Fabrication and Performance Test of Fault Current Limiting Element Made of Non-Laminated Coated Conductor

The priority for determining the performance of the superconducting current limiter depends on the manufacture and adoption of the superconducting current limiting element with excellent features. The basic conditions for the superconducting current limiting element are a high critical current density and index value, and simultaneously the stable normal operation against the diverse accident conditions within the power system. Further, as the superconducting current limiting element is operated in an extreme low-temperature environment, it should be manufactured with a compact structure, which can reduce the coolant consumption. Such superconducting current limiting element is beneficial as it is applicable to diverse superconducting current limiters. Based on the above premise, this study manufactured the superconducting current limiting element using coated conductors without a laminate layer. Using the manufactured superconducting current limiting element, the current limiting performance test against the fault current was carried out, the superconductivity recovery test conducted by measuring the time required for the superconductivity recovery was also carried out, and the temperature distribution was analyzed. For the test of the performance of the superconducting current limiting element that limits the fault current, the results of testing the effective limiting of the applied fault current according to the established fault angles were presented. Further, the superconductivity recovery test derived the required time for the recovery of the superconductivity state by the superconducting current limiting element according to the applied voltage size and power application cycles. Lastly, the temperature distribution analysis according to the applied voltage size and current transport cycles offered the data for the applicable maximum voltage per unit length of the superconducting current limiting element, and this became the evaluation index for determining the voltage rating of such element.