发表机构
Department of Electrical and Computer Engineering, The University of Texas at Dallas（德克萨斯大学达拉斯分校电气与计算机工程系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过实验测试利兹线绝缘在重复双极性方波电压下的击穿行为，发现频率升高导致击穿电压显著下降，为高频电力电子应用提供结构特异性数据。
AI 中文摘要
本文研究了利兹线绝缘在重复快速边沿双极性方波电压下的介电击穿行为，此类电压代表了宽禁带（WBG）功率变换器的应力条件。采用绞线对配置，对14 AWG和16 AWG两种导体尺寸，在1 kHz至30 kHz的频率范围内，使用具有200 ns上升时间的受控高压脉冲发生器进行了测试。根据IEEE Std 930-2004标准，使用加权双参数Weibull方法对各频率下获得的击穿电压进行了统计分析。在1至30 kHz之间，14 AWG结构的平均击穿电压下降约10.7%，16 AWG结构下降约20.0%。14 AWG试样在1至5 kHz之间表现出轻微增加后下降的趋势，而16 AWG的平均值在所测试频率范围内持续下降。Weibull形状参数随频率非单调变化，表征了所测击穿电压离散性的差异。这些发现提供了与高频电力电子应用中利兹线绝缘评估相关的特定结构击穿数据。本文讨论了电荷积累、局部放电活动和介电加热的可能贡献，但未在本研究中直接验证。
英文摘要
This paper investigates the dielectric breakdown behavior of Litz wire insulation subjected to repetitive fast-edge bipolar square-wave voltages representative of wide-bandgap (WBG) power converter stress. Two conductor sizes, 14 AWG and 16 AWG, were tested in a twisted-pair configuration over frequencies ranging from 1 kHz to 30 kHz using a controlled high-voltage pulse generator with 200 ns rise time. The breakdown voltages obtained at each frequency were statistically analyzed using the weighted two-parameter Weibull method in accordance with IEEE Std 930-2004. Between 1 and 30 kHz, the mean breakdown voltage decreases by approximately 10.7% for the 14 AWG construction and 20.0% for the 16 AWG construction. The 14 AWG specimens exhibit a modest increase between 1 and 5 kHz followed by a decline, whereas the 16 AWG mean decreases across the tested frequencies. The Weibull shape parameter varies nonmonotonically with frequency, characterizing differences in the dispersion of the measured breakdown voltages. These findings provide construction-specific breakdown data relevant to Litz-wire insulation assessment in high-frequency power electronic applications. Possible contributions from charge accumulation, localized discharge activity, and dielectric heating are discussed, but were not directly verified in this study.
