This letter exhibits the presence of High-Frequency (HF) current signatures of arcing in Vegetation High Impedance Fault (VeHIF) events. Zero-crossing arcing discontinuities are shown to have varying widths causing different levels of HF noise bursts depending on how aggressively the 50-Hz waveform gets distorted. The work has identified that the temporal growth in HF disturbances often occurs quicker than those linked to the third harmonic or the entire Low-Frequency (LF) spectrum. In 59.2% of a dataset of 125 phase-to-earth (ph-to-e) faults, the growth in HF spectrum was identified to occur faster than the third-harmonic or the entire LF spectrum. The HF spectrum had an average lead time of 26.58 s over the LF spectrum. The LF indicator performed better in only 15 tests (12%) with an average lead time of 9.6 s. In 13 tests (10.4%), all three indicators concurrently reached the set normalized threshold.

中文翻译：

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植被高阻抗故障低频和高频信号的可见性

这封信展示了植被高阻抗故障 (VeHIF) 事件中存在电弧的高频 (HF) 电流特征。显示过零电弧不连续性具有不同的宽度，导致不同级别的高频噪声突发，具体取决于 50 Hz 波形失真的严重程度。这项工作已经确定，HF 扰动的时间增长通常比与三次谐波或整个低频 (LF) 频谱相关的那些发生得更快。在包含 125 个相对地 (ph-to-e) 故障的数据集中的 59.2% 中，HF 频谱的增长被确定比三次谐波或整个 LF 频谱的增长更快。HF 频谱相对于 LF 频谱的平均提前时间为 26.58 秒。LF 指标仅在 15 次测试 (12%) 中表现更好，平均提前时间为 9.6 秒。在 13 项测试 (10.4%) 中，