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Simulation of Screening Current of Single Phase High Temperature Superconducting Cable

Due to existence of screening layer in high temperature superconducting (HTS) cable, unsymmetrical fault current would be induced between power stations through the ground, thus zero-sequence protection strategy would be changed, compared to normal cables. In this paper, we study the factors which influence the screening currents using numerical modeling technique. Firstly, we establish the finite element method (FEM) model of single-phase superconducting cable, which is verified by analytic method. Then, we simulate the screening current and induced voltage under different resistance. It is found that, the resistance within the screen circuit is the major factor of screen current and induced voltage. In the end, circuit model of the HTS model is proposed to verify the FEM model.