C4F7N/CO2、C5F10O/C6F12O/Air的环保绝缘气体特性研究及应用

Research of C4F7N/CO2,C5F10O/C6F12O/Air Environmental Insulation Gases Performance and Its Application

研究环保绝缘气体具有深远的社会意义。C4F7N、C5F10O混合气体是最有希望替代高温室效应SF6的环保绝缘气体。对C4F7N/CO2、C5F10O/C6F12O/Air混合气体的GWP值、液化性能和绝缘性能进行了详细研究。C4F7N/CO2(总压7 bar,C4F7N分压0.466 bar)的GWP值503,是SF6的2.13%;C5F10O/C6F12O/Air(总压8 bar,C5F10O分压0.285 bar,C6F12O分压0.100 bar)的GWP值0.33,是SF6的0.001%。C4F7N、C5F10O气体沸点较高,C4F7N气体在-25℃环境,其饱和蒸气压为0.466 bar;C5F10O气体在-5℃环境,其饱和蒸气压为0.285 bar。C4F7N/CO2、C5F10O/Air混合气体属于正协同效应气体,具有冲击特性,对负极性冲击电压更为敏感。420 k V GIS用母线在雷电冲击耐受电压1425 kV下,最大电场强度为20.4 kV/mm;可以选择C4F7N/CO2(C4F7N分压0.466 bar,最低功能充气总压7 bar)作为绝缘介质,满足户外GIS-25℃的低温环境要求;也可以选择C5F10O/C6F12O/Air(C5F10O分压0.285 bar,C6F12O分压0.100 bar,最低功能充气总压8 bar)混合气体作为绝缘介质,满足户内GIS-5℃的低温环境要求。研究结果为进一步研发环保型GIS提供参考。

The research of friendly environmental insulation gases has great social significance.The mixture of C4F7N or C5F10O is the most potential alternative to SF6.GWP value,liquefaction and insulation performance of C4F7N/CO2 and C5F10O/C6F12O/Air are studied.GWP value of C4F7N/CO2(total pressure 7 bar,C4F7N 0.466 bar)is 503,which is 2.13%of SF6;GWP value of C5F10O/C6F12O/Air(total pressure 8 bar,C5F10O 0.285 bar,C6F12O 0.100 bar)is 0.33,which is 0.001%of SF6.The boiling temperature of C4F7N and C5F10O are relatively high.The saturated vapor pressure of C4F7N is 0.466 bar at-25℃.The saturated vapor pressure of C5F10O is 0.285 bar at-5℃.The mixtures of C4F7N/CO2 and C5F10O/air are positive synergistic effect gas,and have impulse voltage characteristics and are more sensitive to the negative impulse voltage.Under the lightning impulse withstand voltage of 1425 kV,the maximum electric field strength of 420 kV busbar is 20.4 kV/mm.C4F7N/CO2(C4F7N partial pressure 0.466 bar,minimum function gas total pressure 7 bar)can be selected as the insulation medium to meet the low temperature environment requirement of outdoor GIS-25℃;C5F10O/C6F12O/Air(C5F10O partial pressure 0.285 bar,C6F12O partial pressure 0.100 bar,minimum function gas total pressure 8 bar)can be selected as the insulation medium to meet the low temperature environment requirement of indoor GIS-5℃.The results of this paper provide reference for the further development of friendly environmental GIS.