高电压技术2025，Vol.51Issue(10)：5198-5207,10.DOI:10.13336/j.1003-6520.hve.20241909
氧气比例对C4F7N混合气体高压断路器开断性能的仿真分析与试验验证
Simulation Analysis and Experimental Validation of Oxygen Ratio on C4F7N Mixed Gas High-voltage Circuit Breaker Interrupting Performance
摘要
Abstract
Due to its superior insulating qualities,perfluoroisobutyronitrile(C4F7N)mixed gas is commonly recognized as an environmentally friendly alternative to SF6.However,in comparison to SF6,there is still a gap in arc interrupting abil-ity.For the purpose of guiding the development of environmentally friendly switchgear,it is crucial to investigate the interrupting performance of C4F7N mixed gas under various oxygen(O2)ratios.In order to analyze the gas arc combus-tion process of 0.6 MPa SF6,0.8 MPa 6％C4F7N/CO2,6％C4F7N/CO2/10％O2,and 6％C4F7N/CO2/20％O2,we established a 2-D arc magnetohydrodynamic model for the extinguishing chamber of a 126 kV circuit breaker(CB),and also compared the temperature distribution and airflow variation of the arc in the C4F7N mixed gas extinguishing chamber under various O2 ratios.The Mayr arc model was used to study the effect of O2 ratio in C4F7N mixed gas on the post-arc thermal interrupting performance of CB.The results show that an increase in the proportion of O2 in the C4F7N mixed gas will increase the temperature of the C4F7N mixed gas arc core,decrease the arc radius,expand the radial temperature dis-tribution gradient of the arc,increase the upstream gas pressure of the CB nozzle,and accelerate the gas axial blowing speed.For interrupting 25 kA short-circuit currents,the critical recovery voltage rise rates(RRRV)of CB with 0.6 MPa SF6 and 0.8 MPa C4F7N mixed gas with O2 ratios of 0％,10％,and 20％are 3.0,1.0,1.21,and 1.235 kV/μs,respectively.The post arc thermal interrupting capacity of C4F7N mixed gas CB has increased with an increase in O2 proportion.At 20％O2 proportion,the thermal interrupting ability of C4F7N mixed gas reaches 41.1％of SF6,7.8％greater than that of 6％C4F7N/CO2.The relevant research provides theoretical guidance for promoting the development of environmentally friendly C4F7N mixed gas high-voltage switchgear.关键词
C4F7N混合气体/磁流体动力学/开断性能/压气式断路器/SF6替代气体Key words
C4F7N mixed gas/magnetic fluid dynamics/interruption performance/puffer-type circuit breaker/SF6 al-ternative gases引用本文复制引用
曲道霖,林莘,高克利,颜湘莲,王雯,姚尧,徐建源..氧气比例对C4F7N混合气体高压断路器开断性能的仿真分析与试验验证[J].高电压技术,2025,51(10):5198-5207,10.基金项目
国家电网有限公司科技项目(5108-202218280A-2-219-XG).Project supported by Science and Technology Project of SGCC(5108-202218280A-2-219-XG). （5108-202218280A-2-219-XG）
