Abstract：With the development of urban rail transit in China, the performance of self-excited direct current air circuit breaker (SE-DCCB), which plays the protective function, has been put forward higher requirements. Series excitation is used in the SE-DCCB to generate a magnetic field to drive the arc into the arc chamber. Thus, bi-directional breaking can be realized. However, when the equipment on the electric locomotive is in the standby state, the train is in the working state of a small current, which cannot generate enough self-excited magnetic field to drive the arc into the arc chamber. The arc fails to be extinguished in time, endangering rail transit's reliability. Improving the performance of SE-DCCB in breaking small current arcs has become an urgent problem. A magneto-hydro-dynamic (MHD) arc model coupled with a three-dimensional self-excited magnetic field of the SE-DCCB is established. The sheath is processed precisely so that the effect of space charge near the electrode on the arc can be simulated accurately in the model. Taking SE-DCCB breaking 300 A small current as an example, the arc morphology, magnetic field strength, temperature field, and airflow field in the arc chamber are analyzed, and the main reasons for the difficulty in small current breaking in SE-DCCB are explored. During the breaking process of SE-DCCB, the arc root sticks to the arc runner's turning angle, making it difficult to move along both sides of the arc runner, and the utilization rate of splitter plates is reduced. In addition, the double airflow vortices generated at the entrance of the arc chamber make the arc tailing, resulting in a high temperature at the entrance of the arc chamber, and the possibility of arc re-strike is increased. This paper proposes an improved structure of SE-DCCB by simulation analysis. The magnetic conductance strip is installed on the magnetic conductance plate, and the turning radius of the arc running path is reduced. The improved structure of SE-DCCB can speed up arc root motion, increase arc ductility, reduce the adverse factors affecting the small current arc extinction, and shorten the arc burning time. Meanwhile, it can effectively reduce the inlet temperature of the arc extinguishing chamber and reduce the reignition probability after the arc is extinguished. Through simulation analysis, the following conclusions are drawn. (1) In the process of small current breaking, the arc root of SE-DCCB is easy to stop at the turning angle of the arc runner, and the double airflow vortices at the entrance of the arc chamber cause the arc tailing phenomenon, which is challenging makes it difficult for small current breaking of SE-DCCB. (2) The magnetic field strength and distribution above the arc runner affect the viscosity of arc roots. The improved magnetic conductivity structure can enhance such magnetic field strength without changing the excited current. As a result, the arc roots move farther to both sides along the arc runner, and the arc is elongated, facilitating the arc extinguishing with a small current. (3) Reducing the turning radius of the SE-DCCB arc runner can inhibit the generation of double airflow vortices at the entrance of the arc chamber, thus weakening the arc root tailing phenomenon and eliminating the potential arc reignition and breaking failure problems. The improved model established in this paper can accurately predict arc behaviors in the self-excited field of SE-DCCB, which provides a practical way to optimize the small current arc extinguishing performance of SE-DCCB.
李静, 郭沛鑫, 彭世东, 段薇, 曹云东. 基于改进结构的自激式直流空气断路器小电流开断能力提升方法[J]. 电工技术学报, 2024, 39(22): 7278-7290.
Li Jing, Guo Peixin, Peng Shidong, Duan Wei, Cao Yundong. Enhance Small Current Breaking Performance of Self-Excited DC Air Circuit Breaker Based on An Improved Structure. Transactions of China Electrotechnical Society, 2024, 39(22): 7278-7290.
[1] 朱志豪, 赵芳帅, 袁端磊, 等. 城市轨道交通大容量直流快速断路器的研发[J]. 高电压技术, 2018, 44(2): 417-423. Zhu Zhihao, Zhao Fangshuai, Yuan Duanlei, et al.Research and development of high-power and high- speed DC circuit breaker for urban rail transit[J]. High Voltage Engineering, 2018, 44(2): 417-423. [2] Hofmann H, Weindl C, Al-Amayreh M I, et al. Arc movement inside an AC/DC circuit breaker working with a novel method of arc guiding: part I-experiments, examination, and analysis[J]. IEEE Transactions on Plasma Science, 2012, 40(8): 2028-2034. [3] Lee H Y, Lee J G, Khan U A, et al.Electromagnetic field analysis of low voltage DC circuit breaker for the enhancement of arc driving force[C]//2016 International Conference on Condition Monitoring and Diagnosis (CMD), Xi'an, China, 2016: 697-700. [4] Park W, Kim Y K, Lee S, et al.Arc phenomena and method of arc extinction in air circuit breaker[C]// 25 th International Conference on Electricity Distribution, Madrid, 2019: 1-4. [5] 彭世东, 李静, 曹云东, 等. 耦合磁场直流空气断路器栅片特性对灭弧性能的影响研究[J]. 电工技术学报, 2022, 37(21): 5587-5597. Peng Shidong, Li Jing, Cao Yundong, et al.Research on the effect of splitter plate material and structure on arc extinguishing performance with coupling magnetic field[J]. Transactions of China Electrotechnical Society, 2022, 37(21): 5587-5597. [6] Chung H B, Lee K H, Park W J, et al.Arc extinction structure of air circuit breaker for improvement of direct current breaking performance[C]//2022 6 th International Conference on Electric Power Equipment- Switching Technology (ICEPE-ST), Seoul, Korea, 2022: 237-240. [7] Zeller P R, Rieder W F.Arc structure, arc motion, and gas pressure between laterally enclosed arc runners[J]. IEEE Transactions on Components and Packaging Technologies, 2001, 24(3): 337-341. [8] 李静, 易晨曦, 彭世东, 等. 高海拔环境下大容量直流空气断路器灭弧性能研究[J]. 电工技术学报, 2024, 39(3): 863-874. Li Jing, Yi Chenxi, Peng Shidong, et al.Study on interrupting characteristics of large capacity DC air circuit breaker at high altitude[J]. Transactions of China Electrotechnical Society, 2024, 39(3): 863-874. [9] Ma Ruiguang, Rong Mingzhe, Yang Fei, et al.Investigation on arc behavior during arc motion in air DC circuit breaker[J]. IEEE Transactions on Plasma Science, 2013, 41(9): 2551-2560. [10] 满家健, 吴翊, 杨飞, 等. 基于CCD高速摄影仪的直流电弧实验研究[J]. 电工电气, 2015(7): 38-42. Man Jiajian, Wu Yi, Yang Fei, et al.Experimental research of DC-arc based on CCD high-speed cinetoscope[J]. Electrotechnics Electric, 2015(7): 38-42. [11] 钟昱铭, 熊兰, 杨子康, 等. 计及铜蒸气介质的小电流直流电弧仿真与实验[J]. 电工技术学报, 2020, 35(13): 2913-2921. Zhong Yuming, Xiong Lan, Yang Zikang, et al.Numerical simulation and experiment of small current DC arc considering copper vapor medium[J]. Transactions of China Electrotechnical Society, 2020, 35(13): 2913-2921. [12] Al-Amayreh M I, Hofmann H, Nilsson O, et al. Arc movement inside an AC/DC circuit breaker working with a novel method of arc guiding: part II-optical imaging method and numerical analysis[J]. IEEE Transactions on Plasma Science, 2012, 40(8): 2035-2044. [13] 张明, 王永兴, 田宇, 等. 气流场驱动下栅片中弧压提升特性的数值分析[J]. 电工技术学报, 2019, 34(13): 2752-2759. Zhang Ming, Wang Yongxing, Tian Yu, et al.Numerical analysis of arc voltage increasing characteristics in plate driven by airflow field[J]. Transactions of China Electrotechnical Society, 2019, 34(13): 2752-2759. [14] Yang Fei, Rong Mingzhe, Wu Yi, et al.Numerical analysis of arc characteristics of splitting process considering ferromagnetic plate in low-voltage arc chamber[J]. IEEE Transactions on Plasma Science, 2010, 38(11): 3219-3225. [15] 李静, 袁志曹, 曹云东, 等. 触头运动特性对直流接触器开断性能影响[J]. 电机与控制学报, 2023, 27(11): 79-89. Li Jing, Yuan Zhicao, Cao Yundong, et al.Influence of contact motion characteristics on breaking performance of DC contactor[J]. Electric Machines and Control, 2023, 2023, 27(11): 79-89. [16] Peng Shidong, Li Jing, Yang Juncheng, et al.Cathode sheath parameters and their influences on arc root behavior after liquid metal bridge rupture in atmospheric air[J]. Physics of Fluids, 2023, 35(10): 101703. [17] Rong Mingzhe, Yang Fei, Wu Yi, et al.Simulation of arc characteristics in miniature circuit breaker[J]. IEEE Transactions on Plasma Science, 2010, 38(9): 2306-2311. [18] 裴军, 孙昊, 刘增超, 等. 低压断路器中金属蒸气对电弧过程影响的仿真研究[J]. 低压电器, 2011(3): 12-15. Pei Jun, Sun Hao, Liu Zengchao, et al.Simulation and experiment of influence of metal steam on arc process in low voltage circuit breaker[J]. Low Voltage Apparatus, 2011(3): 12-15. [19] Fan Shilong, Yang Fei, Zhu Xiaonan, et al.Numerical analysis on the effect of process parameters on deposition geometry in wire arc additive manufacturing[J]. Plasma Science and Technology, 2022, 24(4): 044001. [20] Basse N T, Kissing C, Bini R.Measured 3D turbulent mixing in a small-scale circuit breaker model[J]. Journal of Physics D: Applied Physics, 2011, 44(24): 245201. [21] Gonzalez J J, Freton P, Reichert F, et al.Turbulence and magnetic field calculations in high-voltage circuit breakers[J]. IEEE Transactions on Plasma Science, 2012, 40(3): 936-945. [22] 赵泽洋, 肖慈恩, 刘亚坤, 等. 接闪阳极参数对雷电弧材料损伤数值分析的影响[J]. 电工技术学报, 2024, 39(5): 1486-1496. Zhao Zeyang, Xiao Cien, Liu Yakun, et al.Influence of anode on numerical analysis of arc-material interactions with multi-field coupling in lightning damage[J]. Transactions of China Electrotechnical Society, 2024, 39(5): 1486-1496. [23] 陈默,陆宁懿,翟国富.基于电弧磁流体仿真的DC 1 500 V两极塑壳断路器气道优化设计[J]. 电工技术学报, 2023, 38(8): 2222-2232. Chen Mo, Lu Ningyi, Zhai Guofu.Arc chamber optimization of DC 1 500 V two-pole circuit breakers based on arc magneto hydro dynamics simulation[J]. Transactions of China Electrotechnical Society, 2023, 38(8): 2222-2232. [24] Wu Yi, Rong Mingzhe, Sun Zhiqiang, et al.Numerical analysis of arc plasma behaviour during contact opening process in low-voltage switching device[J]. Journal of Physics D: Applied Physics, 2007, 40(3): 795-802. [25] Yang Fei, Rong Mingzhe, Wu Yi, et al.Numerical analysis of the influence of splitter-plate erosion on an air arc in the quenching chamber of a low-voltage circuit breaker[J]. Journal of Physics D: Applied Physics, 2010, 43(43): 434011. [26] Huo Jindong, Wang Yifei, Cao Yang.3D computational study of arc splitting during power interruption: the influence of metal vapor enhanced radiation on arc dynamics[J]. Journal of Physics D Applied Physics, 2021, 54(8): 085502. [27] Zhu S L, von Engel A. Fall regions and electrode effects in atmospheric arcs of vanishing length[J]. Journal of Physics D: Applied Physics, 1981, 14(12): 2225-2235. [28] Yokomizu Y, Matsumura T, Henmi R, et al.Total voltage drops in electrode fall regions of, argon and air arcs in current range from 10 to 20 000 A[J]. Journal of Physics D: Applied Physics, 1996, 29(5): 1260-1267. [29] 赵泽洋, 肖慈恩, 刘亚坤, 等. 接闪阳极参数对雷电弧材料损伤数值分析的影响[J]. 电工技术学报, 2024, 39(5): 1486-1496. Zhao Zeyang, Xiao Cien, Liu Yakun, et al.Influence of anode on numerical analysis of arc-material interactions with multi-field coupling in lightning damage[J]. Transactions of China Electrotechnical Society, 2024, 39(5): 1486-1496. [30] Yan J D, Nuttall K I, Fang M C.A comparative study of turbulence models for SF6 arcs in a supersonic nozzle[J]. Journal of Physics D: Applied Physics, 1999, 32(12): 1401-1406. [31] 王党树, 邓翾, 刘树林, 等. 甲烷/空气混合气体在针板电极下的微间隙放电特性[J]. 电工技术学报, 2023, 38(13): 3388-3399. Wang Dangshu, Deng Xuan, Liu Shulin, et al.Microgap discharge characteristics of methane/air under the needle plate electrode[J]. Transactions of China Electrotechnical Society, 2023, 38(13): 3388-3399. [32] 杨茜, 荣命哲, 吴翊, 等. 低压断路器中空气电弧重击穿现象的仿真与实验研究[J]. 中国电机工程学报, 2007, 27(6): 84-88. Yang Qian, Rong Mingzhe, Wu Yi, et al.Simulation and experimental research on air arc restriking in low- voltage circuit breaker[J]. Proceedings of the CSEE, 2007, 27(6): 84-88. [33] 李静, 刘凯, 曹云东, 等. 直流接触器分断过程中弧根演变及对重燃的影响分析[J]. 中国电机工程学报, 2019, 39(4): 1241-1251. Li Jing, Liu Kai, Cao Yundong, et al.Arc root development and its influence on arc reigniting during the breaking process of the DC contactor[J]. Proceedings of the CSEE, 2019, 39(4): 1241-1251. [34] Sun Hao, Rong Mingzhe, Chen Zhexin, et al.Investigation on the arc phenomenon of air DC circuit breaker[J]. IEEE Transactions on Plasma Science, 2014, 42(10): 2706-2707.
2024, Vol. 39 
