CO_(2)、SF_(6)以及C_(4)F_(7)N气体电弧特性的仿真对比研究

Simulation and Comparison Study on Arc Characteristics of C_(4)F_(7)N,CO_(2)and SF_(6)

寻求可替代SF_(6)用于高压电气设备的气体是近年来的研究热点,而C_(4)F_(7)N气体由于具有较好的环保性能和优良的绝缘特性而极具潜力。然而受限于实验成本等原因,现阶段对于其灭弧性能的研究相对较少。通过仿真分析气体电弧行为能够为环保型开关的设计提供重要指导。文中首先分析了C_(4)F_(7)N、CO_(2)和SF_(6)3种气体电弧的物性参数及成因,基于此采用磁流体动力学方法建立了轴对称二维喷口电弧模型并进行了计算,获得了C_(4)F_(7)N、CO_(2)和SF_(6)中电弧等离子体的温度分布及对应燃弧情况下的电弧电压,结合电弧物性参数结果分析了3种气体燃弧特性的主要成因。研究发现,纯C_(4)F_(7)N气体的电弧半径与电弧电压均与SF_(6)气体相近,相比于纯CO_(2)气体表明了其作为灭弧介质的潜在应用前景。但由于C_(4)F_(7)N气体分子质量相对较高,后续C_(4)F_(7)N气体的电弧仿真需要对湍流参数进行进一步研究,并通过相应的实验进行验证。

C_(4)F_(7)N gas has received wide attention as an alternative gas to SF_(6)in recent years due to its good environmental performance and excellent insulation properties.However,since the study cost on the arc of C_(4)F_(7)N gas is higher,therefore,the analysis of its arc by way of simulation and comparison with the arc property of SF_(6)gas can provide important guidance for the design of environmentally environmentally friendly switches.In this paper,a twodimensional nozzle arc model is set up and calculated based on magnetohydrodynamic method and the temperature distribution of arc plasma in C_(4)F_(7)N,CO_(2)and SF_(6)is obtained.It is found by the study that the arc radius of pure C_(4)F_(7)N gas is similar to that of SF_(6),so C_(4)F_(7)N gas has potential application as an extinguishing medium.And the turbulence effect is still considered in the subsequent arc simulation of C_(4)F_(7)N gas.