王钰洁, 许诺, 王立军. 大电流空气电弧栅片烧蚀数值模拟与分析[J]. 高电压技术, 2024, 50(6): 2645-2652. DOI: 10.13336/j.1003-6520.hve.20231601
引用本文: 王钰洁, 许诺, 王立军. 大电流空气电弧栅片烧蚀数值模拟与分析[J]. 高电压技术, 2024, 50(6): 2645-2652. DOI: 10.13336/j.1003-6520.hve.20231601
WANG Yujie, XU Nuo, WANG Lijun. Numerical Simulation and Analysis of Plate Erosion by High-current Air Arc[J]. High Voltage Engineering, 2024, 50(6): 2645-2652. DOI: 10.13336/j.1003-6520.hve.20231601
Citation: WANG Yujie, XU Nuo, WANG Lijun. Numerical Simulation and Analysis of Plate Erosion by High-current Air Arc[J]. High Voltage Engineering, 2024, 50(6): 2645-2652. DOI: 10.13336/j.1003-6520.hve.20231601

大电流空气电弧栅片烧蚀数值模拟与分析

Numerical Simulation and Analysis of Plate Erosion by High-current Air Arc

  • 摘要: 电网输配电容量不断增加对低压断路器的开断性能提出了更高的要求。低压断路器开断大电流时,电弧烧蚀灭弧栅片产生的金属蒸汽会极大的影响断路器开断性能,阻碍断路器发展并且不利于电网安全运行。因此,建立了开断电流为10 kA的栅片烧蚀模型,研究了栅片烧蚀特性。模型考虑了栅片阴极端和阳极端不同的电弧能量注入,栅片材料的熔化、蒸发以及栅片表面形貌变化,并将弧根运动引入模型中。利用此模型计算了铁栅片烧蚀质量以及温度和熔化材料分布。仿真结果表明:栅片阴极端温升大小和范围均小于栅片阳极端的值。栅片表面熔化区域尺寸和位置随着弧根的移动而改变。栅片阳极端熔沸点来临时刻分别是2.19 ms和2.89 ms,烧蚀质量为1.84 mg。而栅片阴极端熔点来临时刻为4.12 ms,温度始终低于栅片材料沸点,烧蚀质量近乎为0。该文得到了单次开断下栅片两端烧蚀形貌,为研究多次开断下栅片烧蚀引起的栅片间短弧长度和移动路径变化对断路器开断性能的影响献力。

     

    Abstract: The increasing capacity of transmission and distribution of power grids puts forward higher requirements for the low-voltage circuit breaker(LVCB) interruption performance. When an LVCB breaks a high current, the metal vapor produced by arc plate erosion greatly affects the interruption performance of the circuit breakers, impedes the development of the circuit breaker, and impairs the safe operation of the power grid. Therefore, a plate erosion model with a breaking current of 10 kA is established and the plate erosion characteristics are studied in this paper. The model considers the different energy injects of plate cathode and anode, the melting and evaporation of plate materials, and the changes of plate surface morphology, and introduces the arc root movement into this model. By using this model, the erosion mass and the distribution of temperature and melting materials are calculated. The results show that the temperature rise and temperature rise area of plate cathode are less than those of the plate anode. The position and size of the melting area change with the movement of the arc root. The plate anode temperature reaches the material melting point and boiling point at 2.19 ms and 2.89 ms, respectively. The erosion mass of plate anode is 1.84 mg. The plate cathode temperature reaches the material melting point at 4.12 ms and is always less than the material boiling point. The erosion mass of plate cathode approaches 0. The plate erosion morphology is obtained in this paper, and the results can contribute to the study of the effect of change in the length and migration path of short arc between plates caused by plate erosion on the interruption performance of the circuit breakers.

     

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