Establishment of Paper-Ice Composite Insulation System toward to HTS Cable

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We have been suggesting the paper-ice composite system as one of the candidates for the insulating system with LN2 in high-temperature superconducting cables. The paper-ice composite system is an insulating paper filled with ice and it could inhibit the partial discharge inside the microscopic N_2 gas bubbles remained in the paper. Main results are summarized as below.(1) It was confirmed that the KP-Ice composite system could provide lower capacitance and high-voltage endurance to high-temperature superconducting cable.(2) It was confirmed that PPLP immersed in LN_2 had higher dielectric strength(Fb) than the KP in LN2. It was also confirmed that Positive Fb of PPLP was higher than negative Fb of PPLP. This result could lead the two charge transfer models, the injection model of the negative charge into the KP layer of PPLP and no-injection model of the charge into the PP layer.