Steady-state Current Simulation and Onsite Test of Two-section Three-phase Coaxial High Temperature Superconducting Cable

In order to realize the technical breakthrough of high temperature superconducting (HTS) cable in large capacity transmission, a new two-section three-phase coaxial HTS cable is studied in this paper. Its structure and parameters were proposed. The current carrying capacity of the HTS cable was verified through MATLAB/Simulink simulation and actual onsite tests. The results showed that the two-section structure of the cable can effectively reduce the shield layer current to less than 3% of the rated current, and reduce the three-phase imbalance ratio to 4.1%, which provides an important data basis for the practical application of this HTS cable in the future.