自能式高压SF_(6)断路器开断大电流仿真分析  

Simulation Analysis of High-Voltage SF_(6)Circuit Breakers with Self-Energy for Breaking Large Current

作　　者：杨健 YANG Jian(State Grid Leshan Power Supply Company,LeShan,SiChuan 614000,China)

机构地区：[1]国网乐山供电公司,四川乐山614000

出　　处：《自动化应用》2024年第8期135-139,共5页Automation Application

摘　　要：高压SF_(6)断路器在电网中作用重大,以体积小、开断能力强著称。开断大电流时,灭弧室电弧熄灭过程是各国研究的重点,也是断路器灭弧室优化、检修、调试的主要依据。依据二维电弧动态模型,使用FLUENT18.0建立电弧仿真模型,模拟开断35.36kA电流,通过有限元分析,充分掌握开断过程中温度、压力、速度和电位的分布情况。在仿真分析中,我国首次获得电弧流动速度随温度变化的规律:当热喷室和大小喷口下游,压差达到405300Pa时,电弧最高流动速度达到9024 m/s;当压力差达到101325 Pa时,电弧流动速度出现大幅增长,达到1373 m/s,与LS FROST理论计算的结果非常接近。该规律在自能式SF6断路器灭弧室发展过程中具有重要的理论意义。High-voltage SF_(6)circuit breakers play a significant role in the power grid,known for their small size and strong breaking capacity.The process of extinguishing the arc in the arc extinguishing chamber during high current interruption is a focus of research in various countries around the world,and it is also the main basis for optimizing,repairing,and debugging the arc extinguishing chamber of circuit breakers.Based on the two-dimensional arc dynamic model,an arc simulation model was established using FLUENT18.0 to simulate the breaking current of 35.36 kA.Through finite element analysis,the distribution of temperature,pressure,velocity,and potential during the breaking process was fully grasped.In simulation analysis,China obtained the law of arc flow velocity changing with temperature for the first time.When the pressure difference downstream of the thermal spray chamber and large and small nozzles reached 405300 Pa,the maximum flow velocity of the arc reached 9024 m/s,and the pressure difference reached 101325 Pa.The arc flow velocity increased significantly,reaching 1373 m/s,which is very close to the results calculated by LS FROST theory.It has important theoretical significance in the development process of self-energy SFe circuit breaker arc extinguishing chambers.

关 键 词：自能式 断路器 灭弧 仿真 

分 类 号：TM769[电气工程—电力系统及自动化]