Electromagnetic Field Analysis of a High Current Capacity DC HTS Cable With Self-shielding Characteristic by 2-D Simulation

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Comparing with direct current (dc) conventional transmission lines, dc high-temperature superconducting (HTS) power cables have advantages of high current, low transmission loss, and environmental friendly characteristics. With regard to HTS cables with coaxial configuration and self-shielding functions, this type of cable has a “sandwich” structure that is obtained by interleaving the windings for the minimization of the magnetic field and the degradation of the critical current. This paper proposes a two-dimensional (2-D) model for simulating magnetic field distributions, such that the critical current distribution can be found precisely. The ac loss is also analyzed since the current in the dc transmission is comprised of dc and ac ripple. This 2-D analysis model provides a useful reference for the design and operation of dc HTS cables with large current capacity without magnetic field disturbance.