A Self-Shielding DC HTS Cable Using Coaxial Configuration With Large Current Capacity

DC high-temperature superconducting (HTS) cables have advantages of high current capacity, low ac loss, and higher controllability compared with ac HTS cables. To minimize the magnetic field effect and the critical current degradation, a new configuration of dc HTS cables was ever put forward. This kind of cable has a self-shielding characteristic and a “sandwich” structure by interleaved winding. This paper presents a detailed magnetic field analysis of this structure such as the magnetic field in each layer. This magnetic field analysis confirms that this configuration can minimize the magnetic field in each layer and outer space, thus reducing the critical current degradation, and has self-shielding advantage. This structure is also compact and saves more material. Therefore, the cable is a potential HTS transmission line with large current capacity in the application of mid- and low-voltage dc power transmission.