- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LIU Yicen, WU Guangning, GUO Yujun, LIU Yijie, WEI Wenfu, LEI Xiao, LI Peidong. Motion Characteristics Analysis of DC Arc on Arcing Horn[J]. Journal of Southwest Jiaotong University, 2023, 58(1): 40-47. doi: 10.3969/j.issn.0258-2724.20210156
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Grounding electrode line is an important part of the DC power transmission system, and it is a channel for the unbalanced current and the grounding current in the DC system. When the grounding electrode line is attacked by lightning, the grounding current will form a stable arc in the gap. Since the DC current has no periodic zero crossing point, the DC arc is difficult to extinguish, which damages the line insulation and seriously threatens the safety of the entire system. As the arcing horn of the grounding electrode line is in an open space, and the arc motion is affected by multi-field coupling, a two-dimensional simulation model of the arc horn based on magnetohydrodynamics is built to study the effects of the airflow velocity, direction and the structure of arcing horn on the DC arc motion. The results show that the arc is mainly driven by electromagnetic force and moves along the electrode. Through the arc blowing and stretching, the temperature is reduced, and the voltage is increased, which are beneficial to extinguishing arc. The airflow has a greater influence on the dynamic characteristics of the arc, and the wind speed in the same direction is beneficial to the blowing and dredging of the arc. At the same wind speed, the normal airflow plays a major role in the arc blowing. Electrode types have an important effect on the stretching of the arc. With the same gap distance, the double-horn electrode has a more significant stretching effect on the arc than the single-horn electrode. When the DC ground current is continuously injected, the arc is easy to reignite and difficult to extinguish completely.
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