550kV SF_6断路器气流与电弧相互作用混沌研究

Chaotic Characteristic Analysis of the Interaction Between Arc and the Gas Flow of 550kV SF6 Circuit Breaker

由于断路器在短路开断过程中不可避免地伴随有电弧产生,电弧能量的有效逸散直接影响灭弧断口内的介质恢复。为描述短路开断过程中灭弧室内跨音速、变边界、变流路湍动吹弧气流的流动特性以及开断进程中电弧发生及发展的行为演变,提出并引入等效单元体动态电弧物理数学模型,采用有限体积法作为多物理场求解策略,实现燃弧过程中吹弧气流的非线性运动行为数值模拟。采用混沌理论,分析开断进程中各气流参数的动态变化,得到燃弧过程中所存在的电弧混沌特征的描述。

The arc is developed in the circuit breaker during the short circuit breaking, and the energy effective dissipation of the arc can directly affect the dielectric recovery characteristics. For qualitatively reflecting the transonic, variable boundary, variable gas flow path, the turbulent flow characteristics and the dynamic behavior of the arc occurring and developing under the short circuit breaking, the equivalent unit cell dynamic arc model was proposed and applied in this paper, and finite volume method was used as the multiple-physical fields simulation tool, the nonlinear arc quenching flow movement behavior of the breaking process was simulated. Moreover, the chaos theory was used to analyze the gas flow parameters of the breaking process, and the existence of arc chaotic characteristics in the arc burning process was identified and obtained.