Electromagnetic Force and Fault-Current Limitation of Self-Shielded HTS DC Cable Under Short-Circuit Current

Compared to conventional cables, high-temperature superconducting (HTS) dc cable offers numerous benefits, such as low loss, high transmission current, and small volume. The self-shielding structure allows HTS dc cables to carry a larger critical current and smaller leakage magnetic field. In the event of a short-circuit fault, the current through the cable will increase several times instantaneously, and the electromagnetic force on the cable will also be greater. Therefore, it is necessary to study the electromagnetic force and current change of HTS dc cable under short-circuit current. Based on the finite element method (FEM), this article establishes a 3-D model to simulate the short-circuit electromagnetic force and current evolution of three kinds of HTS dc cables with different structures, and analyzes the changes of electromagnetic force and fault current under different structures, which is crucial for the design and operation of HTS dc cables.