Development of a Fault Analysis Algorithm for HTS Power Cable Using RTDS Considering Both Conducting and Shield Layers

High Temperature Superconducting (HTS) power cable consists of a conducting layer and a shield layer for carrying the required current. Geometrically, the conducting and shield layers each have self inductance; and the mutual inductance exists between the conducting and shield layers. Therefore, the direction of the current of shield the layer is opposite that of the conducting layer current. The value of the shield layer current is over 95% of the conducting layer current at the steady state. However, if a fault current passes through an HTS power cable, the quench occurs in both the conducting and shield layers. After the quench, resistance appears, and the even self inductance values are not changed a great deal, but the mutual inductance value is directly affected. According to the above mentioned processes, the current distribution of the conducting and shield layers changes due to the fault current. In this paper, the authors describe the transient state analysis of a real manufactured HTS power model cable, considering both the conducting and the shield layers. The manufactured system is coupled with RTDS, in which a utility grid is composed and simulated. These results provide important data for the design of an HTS power cable.