Arc characteristics during the instability stage on transverse magnetic field contacts |
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Affiliation: | 1. State Grid Hebei Electric Power Research Institute, Shijiazhuang 050021, People's Republic of China;2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China |
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Abstract: | The arcing process greatly affects the breaking ability after current zero. The instability stage is the transition stage from the ignition to the movement stage, which affects the arc movement characteristics. In this paper, the arc characteristics during the instability stage on spiral-type contacts were investigated using a high-speed video camera. A multi-column parallel instability mode and a single-column instability mode were found during the instability stage. The arc appearance and constriction degree changed rapidly. The arc voltage usually increased accompanied by fluctuations. In addition, it was found that the current significantly influenced the arc mode and duration in the instability stage. With increased peak current, the probability of a single-column instability mode increased, and the fluctuation range and average time decreased. |
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Keywords: | vacuum arc transverse magnetic field (TMF) contact instability stage arc characteristic |
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