摘要
由于断路器在开断过程中产生电弧,若电弧重燃会导致开断失败,因此电弧本身的特性对断路器的开断性能影响十分重要。由于电弧与气流相互作用,同时电弧与气流均在短时间内动态变化,是一非定常、有黏、有源且变边界的复杂求解过程。本文针对550k V单断口高压SF_6断路器开断容性小电流和短路故障两种情况进行分析,基于有限体积法对不同开断条件下的气流场进行数值仿真,引入等效单元体电弧动态模型,同时提取不同采样点下的气流参数时间序列,采用混沌理论方法对不同开断条件下的混沌特征量进行对比分析,有效利用混沌可以增强电弧能量的逸散作用,利于电弧熄灭,提高开断性能。
Arc appears during the breaking process in the circuit breaker, if the arc reignited can lead to the breaking failure, so characteristics of arc itself is important for the performance of the circuit breaker. Because of the interaction between the arc and gas flow, and also both the arc and gas flow dynamically changed in a short time, is a complex solving because of the unsteady, sticky characteristic with the source and variable boundary. In this paper, the 550 kV single break high voltage SF_6 circuit breaker is analyzed under small capacitive current and short-circuit fault conditions, based on the finite volume method to numerically simulate the gas flow field under different breaking conditions, the introduction of an equivalent unit dynamic arc model, and furthermore the gas flow parameters time series of different sampling points are obtained, also the chaos theory is used to analyze the chaotic characteristics quantity under different breaking conditions, the chaos can be effectively used to enhance the arc energy dissipation effect, which helpful for the arc extinguishing, in order to improve the breaking performance.
出处
《电气工程学报》
2015年第11期27-32,共6页
Journal of Electrical Engineering
关键词
电弧
混沌
高压SF6断路器
气流场
相空间
Arc
chaos
high voltage SF_6 circuit breaker
gas flow field
phase space
