Partial discharge in high temperature superconducting cables impregnated with air, nitrogen gas and liquid nitrogen

摘要

High Temperature Superconducting (HTS) cables are promising technique for electric power supply. The HTS cables adopt the composite insulation system using both polypropylene laminated paper (PPLP) and liquid nitrogen. In shipment whole part of the cables should be tested, but only parts of the cables are tested because of the high cost caused by using liquid nitrogen. The alternative test without liquid nitrogen is increasingly demanded. In this paper, partial discharges (PD) in HTS cable models are detected under three situations, air, gaseous nitrogen and liquid nitrogen. The possibilities of the alternative test are examined by comparing PD inception electric field and the amount of the electricity under three situations.