喷口结构对半自能式SF_6断路器最短燃弧时间的影响  

Impact of Nozzle Structure on Short Arc Time of Half-self-extinguish SF_6 Circuit Breaker

作　　者：金立军[1] 董骁[1] 闫书佳[1] 李水清 

机构地区：[1]同济大学电信学院,上海201804 [2]正泰电气股份有限公司,上海201600

出　　处：《高压电器》2013年第3期64-68,共5页High Voltage Apparatus

摘　　要：最短燃弧时间是衡量断路器性能的重要参数,笔者提出一种控制最短燃弧时间的优化方案。首先以流体力学、电弧理论为基础,建立了灭弧室内流场分布和电场分布的数学模型,并以此为基础提出通过仿真确定SF6断路器最短燃弧时间的方法;然后研究了喷口结构对断路器燃弧时间的影响,提出通过改变喷口喉部出口处仰角减小最短燃弧时间的方案,仿真分析了5种不同的改进方案对最短燃弧时间的影响,并最终确定最佳优化方案。Minimum arc time is an important parameter of a circuit breaker. This paper raises an optimization scheme to control the minimum arc time. First, a mathematical model of electric field and flow field in arc chamber is built up based on electric arc theory and fluid mechanics to determine the minimum arc time of the SF6 circuit breaker via simulation; Then, the impact of nozzle structure on the arc time is analyzed, and a scheme for reducing the minimum arc time is proposed by changing the elevation angle at the throat exit. At last, an optimum scheme to achieve the minimum arc time is obtained by comparing five different elevation angles.

关 键 词：SF6断路器 短燃弧时间 喷口 仿真 

分 类 号：TM561.3[电气工程—电器]