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Description
High-temperature superconducting (HTS) coils wound without turn-to-turn insulation (NI coils) show excellent electrical and thermal performance compared to HTS coils wound with insulation material (INS coils). However, charging the NI coils using a direct current (DC) power supply have a slower charging time than the INS coils. To overcome this slow charging time, research is underway to charge the NI coils using a flux pump, a DC voltage source, instead of a DC power supply. In this paper, we conducted experiments to compare the charging and discharging characteristics of an NI and INS coils charging by a rotary HTS flux pump. A superconducting circuit consisting of the two coils with the same magnitude of inductance is connected in series. As a result of the experiments, we compare the charging and discharging characteristics when a DC voltage source of the same value is applied to the two coils with a rotary HTS flux pump which is a contactless excitation rotary device.
