Study on quench characteristics of the small-scale HTS non-insulation closed-loop coil
The closed-loop high-temperature superconducting(HTS)coil operating in persistent current mode can elimi-nate the huge heat leakage from current leads efficiently,and the application of non-insulation(NI)winding technology further improves its thermal stability and self-protection ability.When the NI closed-loop coil suffers local heat quench,the lost mag-netic field energy will not be compensated in time because the power supply is eliminated.An electromagnetic-thermal coupling model was established to study the electromagnetic transient behavior of a NI closed-loop coil during quench process,and the thermal quench mechanism was systematically revealed.The concept of final remained magnetic field retention ratio was proposed to describe the macro quench characteristic of the closed-loop coil.Based on the simulation results,it is found that the small turn-to-turn resistivity helps the coil to maximize the preservation of magnetic field energy,and the saturation effect occurs when the turn-to-turn resistivity is very small.But the maximum temperature is almost unaffected by the turn-to-turn resis-tivity.In addition,the maximum temperature has a linear relationship with the heat quench energy,and the loss of magnetic field energy increases with the increase of the heat quench energy until the magnetic field energy stored in the coil is completely con-sumed.
Non-insulation coilClosed-loop coilQuench characteristicsMulti-physics coupling model
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