According to growing demand for high power electric machines, HTS coils which are able to transport high current have been widely researched. For application of HTS coils to electric devices stable operation should be verified so that protection schemes of HTS coils have been investigated by many researchers. Among the many insulation methods for protection, the Quasi-Insulation (QI) winding scheme which improves thermal stability without charging-discharging delay has been proposed. The performance of the QI is affected by exposure area to coolant so that thermal stability depending on the width of the insulation tape should be considered. In this study, the magnetic characteristics and cryo-stability of the QI HTS coils using HTS tape according to the different width of the insulation tape were experimentally analyzed. A wider HTS tape (12 mm) was used to wind tested QI coils for transporting higher current, and QI coils with narrower insulation tape than half of the HTS tape were especially analyzed. The temperature estimation was also carried out to support the experimental results. Even though the width of insulation tape was narrower than an half of the HTS tape, field delay, generated field saturation and degradation were not observed from the experimental results. Therefore, the QI coil with narrower insulation tape can provide better thermal stability without any weaknesses of field generation so that the QI coil can be adopted in high current application such as SMES with higher operation margin.

根据对大功率电机的日益增长的需求，已经能够广泛地研究能够输送大电流的HTS线圈。为了将HTS线圈应用于电气设备，应验证其稳定运行，以便许多研究人员研究HTS线圈的保护方案。在许多用于保护的绝缘方法中，已经提出了一种准绝缘（QI）绕组方案，该方案可提高热稳定性而又不存在充放电延迟。QI的性能受冷却液暴露区域的影响，因此应考虑取决于绝缘带宽度的热稳定性。在这项研究中，根据绝缘带的不同宽度，对使用HTS胶带的QI HTS线圈的磁特性和低温稳定性进行了实验分析。较宽的HTS胶带（12毫米）用于缠绕经过测试的QI线圈以传输更高的电流，并且特别分析了绝缘胶带比HTS胶带的一半窄的QI线圈。还进行了温度估算以支持实验结果。即使绝缘带的宽度比HTS胶带的宽度窄一半，从实验结果中也未观察到场延迟，产生的场饱和和退化。因此，具有较窄绝缘带的QI线圈可以提供更好的热稳定性，而没有产生磁场的任何缺点，使得该QI线圈可以被用于高电流应用中，例如具有更高操作裕度的SMES。还进行了温度估算以支持实验结果。即使绝缘带的宽度比HTS胶带的宽度窄一半，从实验结果中也未观察到场延迟，产生的场饱和和退化。因此，具有较窄绝缘带的QI线圈可以提供更好的热稳定性，而没有产生磁场的任何缺点，使得该QI线圈可以被用于高电流应用中，例如具有更高操作裕度的SMES。还进行了温度估算以支持实验结果。即使绝缘带的宽度比HTS胶带的宽度窄一半，从实验结果中也未观察到场延迟，产生的场饱和和退化。因此，具有较窄绝缘带的QI线圈可以提供更好的热稳定性，而不会产生任何场强弱点，因此该QI线圈可以用于高电流应用中，例如具有更高工作裕量的SMES。