Abstract：The multi-chamber arc-extinguishing structure, which uses multiple semi- enclosed arc-extinguishing chambers in series to quench long arc in sections, has been widely concerned by scholars because of its excellent lightning protection performance. When multi-chamber arc- extinguishing structure is broken down, the movement characteristics of high current impact arc in semi-enclosed arc-extinguishing chamber directly affect the arc-extinguishing performance of multi-chamber arc-extinguishing structure. In order to study the motion characteristics of the high current arc in the arc-extinguishing chamber, the three-dimensional numerical simulation model of the impact arc in a single semi-enclosed arc- extinguishing chamber is established by fully coupling the gas field, fluid heat transfer field and electromagnetic field, and the dynamic evolution process of the arc from the chamber to the outer space is analyzed. Then, the impact current test platform is built and image of the arc moving from the chamber to the outer space is photographed by high-speed camera. The results show that the time when the arc completely moves to the outside of the chamber and the time when the arc is completely extinguished are basically consistent with the experimental image characteristics, which verifies the accuracy of the simulation model; the arc temperature, pressure and air velocity in the chamber increase sharply at first and then decrease slowly with time; when the arc current is 8/20μs and the amplitude is 2kA, the arc highest temperature in the chamber is 41 000K, the maximum pressure is 2MPa, and the maximum gas velocity is 3 000m/s.
贾文彬, 司马文霞, 袁涛, 杨鸣, 成煌. 半密闭灭弧腔室内电弧运动特性的三维仿真和实验[J]. 电工技术学报, 2021, 36(zk1): 321-329.
Jia Wenbin, Sima Wenxia, Yuan Tao, Yang Ming, Cheng Huang. 3D Simulation and Experiment Research on Arc Motion Characteristics in the Semi-Enclosed Arc-Extinguishing Chamber. Transactions of China Electrotechnical Society, 2021, 36(zk1): 321-329.
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2021, Vol. 36 
