Experimental results on the electrical and thermal characteristics of GdBCO racetrack coils co-wound with stainless steel (SS) tapes of various thicknesses and winding tensions are presented in this paper. The SS thickness and winding tension are identified as the factors affecting the charging time and thermal stability of metal insulation (MI) coils. To verify these characteristics, three types of MI-SS racetrack coils were fabricated with various SS thicknesses and winding tensions: 100-μm SS thickness and 10-kgf winding tension; 100-μm SS thickness and 5-kgf winding tension; and 50-μm SS thickness and 10-kgf winding tension. Further, three MI-SS racetrack coils were characterized by sudden discharging, charging, and overcurrent tests. The sudden discharging and charging tests were performed in a steady state to investigate the decay time constant of the center magnetic field discharging the coils and the delay time of the magnetic field charging the test coils, respectively. To estimate the thermal stability of the three MI-SS coils, overcurrent tests were conducted in a transient state at 1.1 times the critical current (I_c) and 1.05 I_c. Based on the experimental results of three small-scale test coils, the total contact resistance between the layers of the test coils was calculated and applied to design a field winding using a second-generation high-temperature superconducting (HTS) tape for a 10-MW-class HTS generator used in an offshore wind turbine environment. Subsequently, an equivalent electrical circuit model was proposed to analyze the electromagnetic response and thermal stability characteristics of three HTS field coils of a 10-MW-class HTS generator with the key parameters of the HTS field coils, which were obtained using electromagnetic finite-element analysis. Finally, the charging delay time and thermal stability of the three HTS field coils were compared and analyzed in detail.

本文给出了GdBCO赛道线圈与不同厚度和缠绕张力的不锈钢（SS）胶带共缠绕的电学和热学特性的实验结果。SS厚度和绕组张力是影响金属绝缘（MI）线圈充电时间和热稳定性的因素。为了验证这些特性，制造了三种类型的MI-SS跑道线圈，它们具有不同的SS厚度和绕组张力：100μmSS厚度和10 kgf绕组张力；SS厚度为100μm，卷绕张力为5kgf; SS厚度为50μm，卷绕张力为10kgf。此外，三个MI-SS跑道线圈的特点是突然放电，充电和过流测试。在稳态下进行突然的放电和充电测试，以分别研究对线圈放电的中心磁场的衰减时间常数和对测试线圈充电的磁场的延迟时间。为了评估三个MI-SS线圈的热稳定性，在瞬态下以临界电流1.1倍（I _c）和1.05 I _c。根据三个小型测试线圈的实验结果，计算出测试线圈各层之间的总接触电阻，并将其应用于设计用于第二代高温超导（HTS）胶带的励磁绕组，用于10-海上风力涡轮机环境中使用的MW级HTS发电机。随后，提出了等效电路模型，以电磁场有限元分析得到的具有关键参数的10 MW级HTS发电机的三个HTS场线圈的电磁响应和热稳定性特征。分析。最后，对三个HTS励磁线圈的充电延迟时间和热稳定性进行了比较和详细分析。