喷口长度对超高压SF_6断路器影响及混沌识别  

Effect of nozzle length on ultra-high voltage SF_6 circuit breaker and chaotic identification

作　　者：刘晓明[1] 朴文泉[1] 冷雪[1] 赵广杰[2] 朱传运[1] 

机构地区：[1]沈阳工业大学电气工程学院,沈阳110870 [2]辽宁装备制造职业技术学院,沈阳110161

出　　处：《沈阳工业大学学报》2013年第5期481-485,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(50877048);教育部新世纪优秀人才支持计划资助项目(NCET-08-0863)

摘　　要：为有效控制喷口区域气流参数,提高流路气流气吹能力,以550kV单断口超高压SF6断路器为研究对象,提出具有不同管道长度的喷口流动结构.采用有限体积法对灭弧室内冷气流流动进行数值模拟,得到断口区域气流压力、密度、速度及马赫数的变化,并且对混沌特性进行了识别.开断过程中喷口管道冷气流流动行为表明,改变喷口长度可以有效调控灭弧室内气流流动,同时明显改变了对介质恢复特性起主要作用的喷口上下游压力差.通过对比分析得出,喷口长度是调控管道内气流流动的主要参数之一,且开断过程中伴随有混沌现象.In order to effectively control the gas flow parameters in nozzle region and improve the blowing capability of gas flow in flow path, a 550 kV single-break ultra-high voltage SF6 circuit breaker was taken as the study object, and the flowing structures of nozzle with different pipeline length were proposed. The numerical simulation for the flowing of cold gas flow in the arc-quenching chamber was performed with the finite volume method, and the variation of gas flow pressure, density, velociy and Mach number in the break region was obtained. In addition, the chaos characteristics were identified. The flowing behavior of cold gas flow in the nozzel pipeline during the breaking shows that the change of nozzle length can not only effectively regulate the flowing of gas flow in the arc-quenching chamber, but also obviously change the pressure difference between upstream and downstream of nozzle which will play a key role in the dielectric recovery characteristics. The comparison and analysis indicate that the nozzle length is one of the main parameters for regulating the flowing of gas flow in the pipeline, and there exists the chaos phenomenon in the breaking process.

关 键 词：SF6断路器 喷口 有限体积法 灭弧室 气流场 混沌 

分 类 号：TM561.3[电气工程—电器]