C_(4)F_(7)N/CO_(2)混合气体在高压断路器中熄弧特性分析  

Analysis on Arc-extinguishing Characteristics of C_(4)F_(7)N/CO_(2)Gas Mixture in High-voltage Circuit Breaker

作　　者：徐胜民 庚振新[1] 崔兆轩 兰新生 夏亚龙 张佳 徐燕强 潘飞 XU Shengmin;GENG Zhenxin;CUI Zhaoxuan;LAN Xinsheng;XIA Yalong;ZHANG Jia;XU Yanqiang;PAN Fei(School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China;State Grid Sichuan Electric Power Research Institute,Chengdu 610041,Sichuan,China;State Grid Gansu Electric Power Research Institute,Lanzhou 730070,Gansu,China;State Grid Ziyang Electric Power Supply Company,Ziyang 641300,Sichuan,China)

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870 [2]国网四川省电力公司电力科学研究院,四川成都610041 [3]国网甘肃省电力公司电力科学研究院,甘肃兰州730070 [4]国网四川省电力公司资阳供电公司,四川资阳641300

出　　处：《四川电力技术》2024年第4期42-46,86,共6页Sichuan Electric Power Technology

基　　金：国家自然科学基金面上项目(51777130);辽宁省教育厅项目(JYTM520231204)。

摘　　要：基于磁流体力学理论,对C_(4)F_(7)N/CO_(2)混合气体和SF_(6)气体的断路器在40 kA短路电流情况下的熄弧特性进行仿真计算,分析两种不同气体的温度特性、灭弧室气体压强。结果表明:相同气压下,9%C_(4)F_(7)N/91%CO_(2)混合气体在燃弧过程中产生的气体压强要比SF_(6)气体产生的压强小,混合气体断路器的燃弧过程中9%C_(4)F_(7)N/91%CO_(2)混合气体熄灭电弧能力相对于SF_(6)气体更弱些;对比电弧等离子体的径向温度,在SF_(6)气体的断路器中,其电弧等离子体的径向温度相较于9%C_(4)F_(7)N/91%CO_(2)混合气体的断路器更高。而在燃弧过程中,相较于SF_(6)气体下的电弧半径,混合气体下的电弧半径更大。当混合气体充气压强提升至0.8 MPa时,温度梯度得到提升,缩减了电弧半径,可有效地扩大径向冷却的作用,使电弧熄灭加速,断路器的熄弧性能能够进一步被提升。Based on the theory of mangetohydrodynamics,the arc-extinguishing characteristics of C_(4)F_(7)N/CO_(2)mixed gas circuit breaker and SF_(6)circuit breaker are simulated and computed under 40 kA short-circuit current,and the thermal properties of two gases and the gas pressure in arc-extinguishing chamber are analyzed.The results show that the gas pressure generated by 9%C_(4)F_(7)N/91%CO_(2)gas mixture during arcing process is smaller than that generated by SF_(6)gas under the same air pressure,and the arc-extinguishing ability of 9%C_(4)F_(7)N/91%CO_(2)gas mixture during arcing process of mixed gas circuit breaker is weaker than that of SF_(6)gas.And the radial temperature of SF_(6)circuit breaker is higher than that of 9%C_(4)F_(7)N/91%CO_(2)mixed gas circuit breaker,and the arc radius generated during arcing process of 9%C_(4)F_(7)N/91%CO_(2)gas mixture is larger than that of SF_(6)gas.When the gas charging pressure of gas mixture is increased to 0.8 MPa,the temperature gradient is improved,the arc radius is reduced,which can efficiently enhance the radial cooling effect,accelerate the extinguishing of arc,and ultimately boost the arc-extinguishing ability of circuit breaker.

关 键 词：高压断路器 SF_(6)替代气体 C_(4)F_(7)N/CO_(2)混合气体 熄弧性能 灭弧室 

分 类 号：TM561[电气工程—电器]