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Interruption of Low Voltage DC Arc in Air under Axial Magnetic Field
IEEE Transactions on Power Delivery ( IF 4.4 ) Pub Date : 2020-04-01 , DOI: 10.1109/tpwrd.2019.2932456
Asif Islam , David Birtwhistle , Tapan K. Saha , Mohammad Shariful Islam

This paper represents the findings from our research in which a series of experiments were conducted on dc current interruption in air in axial magnetic field provided from rare earth magnets mounted in the test electrodes. The experimental range was as follows: arc voltage 80–100 V, arc length 5–10 mm, arc current 80–800 A, and applied field 35–2400 G. The free-burning arc diameter was measured in these experiments from high-speed photographs. It was found that a strong magnetic field can improve the interruption capacity of air-arc significantly. In the experiments, the successful switching time of both 220 and 330 A free-burning air-arc in 2.4 kG was less than half of the successful switching time of corresponding free-burning arcs in air. For higher current arcs, the outcome was more encouraging. An 800 A free-burning arc sustained for about 48 ms, whereas a 315 G field interrupted it within 8 ms. The information found on arc-root diameter and current density of 80–800 A free-burning arcs in air has filled a gap of data found in the literature. This information, in turn, will help to improve the theories available on free-burning arcs.

中文翻译:

轴向磁场作用下空气中低压直流电弧的中断

本文代表了我们的研究结果,其中对安装在测试电极中的稀土磁铁提供的轴向磁场中空气中的直流电流中断进行了一系列实验。实验范围如下:电弧电压 80-100 V,弧长 5-10 mm,电弧电流 80-800 A,外加电场 35-2400 G。速度照片。结果表明,强磁场可以显着提高空气电弧的中断能力。在实验中,220 和 330 A 自由燃烧空气电弧在 2.4 kG 中的成功切换时间不到相应的空气中自由燃烧电弧成功切换时间的一半。对于更高的电流电弧,结果更令人鼓舞。一个 800 A 的自由燃烧电弧持续了大约 48 毫秒,而 315 G 场在 8 毫秒内将其中断。关于弧根直径和 80-800 A 空气中自由燃烧电弧的电流密度的信息填补了文献中数据的空白。反过来,这些信息将有助于改进有关自由燃烧电弧的理论。
更新日期:2020-04-01
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