ELFSL4-2型断路器灭弧室气流场分布计算及分析  

Calculation and Analysis of the Gas Flow Field of Arc Chamber of Type ELFSL4-2 220 kV SF6 Circuit Breaker

作　　者：胡万平[1] 王其平[1] 施文耀[2] 郑庆欣 张安平[2] 

机构地区：[1]西安交通大学,710049 [2]上海华通开关厂,200070

出　　处：《高压电器》1992年第5期9-15,共7页High Voltage Apparatus

摘　　要：根据热力学和等熵流理论,开发出相应的数值计算方法和程序,对ELFSL4—2型断路器灭弧室开断过程中上游气缸压力,温度和喷口气流量进行了计算,同时还计算出电流过零时气压、流速、温度等参数沿喷口轴向的空间分布值。结果显示,该灭弧室较好地利用了电弧阻塞效应,因此具有良好的灭弧能力。Based on the thermodynamics and isentropic flow equations, a simulation program was developed. The gas pressure and temperature inpuffer cylinder in the period of arcing and the spacial distribution of Pressure, flow velocity and temperature along the nozzle axis after current zero were calculated for ELFSL4-2 circuit breaker. It is shown that the ratio of upstream pressure to downstream pressure γ should be increased as high as 3 or more in order to move the normal shock wave in the nozzle to the exit of nozzle so as to get the supersonic flow in the full diverging section of nozzle. It is alos found that from the calculation results γ could be increased to 3 or more by use of the effect of arc clogging in the arc chamber of a ELF SL4-2circuit breaker under its rating breaking currents 45-50kA and arcing time 15-23ms. The arc chamber will have an excellent interruption capability.

关 键 词：六氟化硫 断路器 灭弧室 

分 类 号：TM561.3[电气工程—电器]