摘要
C_(4)F_(7)N/CO_(2)混合气体是目前最有潜力替代SF 6的气体之一。为了探讨C_(4)F_(7)N/CO_(2)混合气体的灭弧能力,文中根据电弧能量平衡理论,建立电弧能量平衡方程组,获取管道内部超压随时间的变化规律。同时,基于磁流体动力学模型,使用COMSOL Multiphysics软件建立压爆气流防雷间隙灭弧结构的二维磁流体模型,在雷电流幅值为4 kA的条件下,对管道内不同比例C_(4)F_(7)N/CO_(2)混合气体在冲击电弧作用下的熄弧特性进行仿真分析。基于上述方法,结合电弧能量平衡理论,分析模型中电导率、速度以及压强的变化规律。与理论结果对比分析得出:同一工况条件下,20%C_(4)F_(7)N/80%CO_(2)的灭弧性能较优,其次为10%C_(4)F_(7)N/90%CO_(2)与5%C_(4)F_(7)N/95%CO_(2),并且熄弧时间符合气吹灭弧的要求。
Currently,the C_(4)F_(7)N/CO_(2)hybrid gas is regarded as one of the most promising SF 6 substitutes.In order to explore the arc quenching capabilities of the C_(4)F_(7)N/CO_(2)gas mixture,a set of arc energy balance equations is developed in accordance with the arc energy balance theory to determine the change law of overpressure within the arc-quenching pipe with time.In the paper,COMSOL Multiphysics software is used to establish a two-dimensional magneto-hydrodynamic model of the arc quenching structure of the pressure-explosive gas flow lightning gap,and the arc quenching characteristics of the different ratios of C_(4)F_(7)N/CO_(2)gas mixtures in the pipeline are simulated and analyzed in the condition that the amplitude of the lightning current is 4 kA under the action of the impulse arc.Based on the above method,the change laws of conductivity,velocity and pressure are analyzed in the model by combining the arc energy balance theory.When compared to the theoretical results,it can be shown that 20%C_(4)F_(7)N/80%CO_(2)extinguishes arcs more effectively than 10%C_(4)F_(7)N/90%CO_(2)or 5%C_(4)F_(7)N/95%CO_(2)does,while the arc quenching time is in line with the specifications for air blowing to extinguish arcs.
作者
吴东
陈文贵
WU Dong;CHEN Wengui(Key Laboratory of Advanced Manufacturing and Automation Technology(Guilin University of Technology),Education Department of Guangxi Zhuang Autonomous Region,Guilin 541006,China)
出处
《电力工程技术》
北大核心
2024年第2期179-188,共10页
Electric Power Engineering Technology
基金
广西自然科学基金资助项目(2022GXNSFBA035613)。
