Abstract
In power system application of high temperature superconducting (HTS) equipment, large amount of heat caused by thermal disturbance or over current during sudden electric interruptions will endanger the thermal stability of HTS devices. However, solid nitrogen (SN2) with large heat capacity can enhance the thermal stability of HTS magnets. In this paper, the quench characteristics of SN2 and conduction cooled REBCO coil under thermal disturbance and over current pulse has been investigated at 60 K. For the thermal disturbance experiment, the minimum quench energy, longitudinal and transverse normal zone propagation velocities in SN2, and conduction cooled system are compared and discussed. The strain response property of the coil from quench to complete cooled down after power off during the quench process has also been preliminarily discussed. What is more, the accumulated peak voltage and strain of the coil during the over current pulse test has been studied. These results show that SN2 can help to enhance the thermal stability of REBCO coil under thermal disturbance and over current pulse.
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