机构地区:[1]Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China [2]School of Electric Power and Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China
出 处:《高电压技术》2013年第9期2288-2293,共6页High Voltage Engineering
基 金:Project supported by National Natural Science Foundation of China (51177101)
摘 要:CF3I has been widely considered as a potential alternative for SF6,because it has low global warming potential(GWP)but an insulation capability that is 1.2 times greater than that of SF6.In this paper,the electron swarm parameters of CF3I and its gas mixture with N2,including the effective ionization coefficient and electron drift velocity,are examined theoretically through the Boltzmann equation method in the condition of steady-state Townsend(SST)experiments.Based on the derived data of the limiting field strength of CF3I-N2gas mixture,taking into consideration of environmental aspects such as GWP,ozone depletion potential(ODP),liquefaction temperature and toxicity,we studied the possibility of applying the gas mixture as the insulation medium in gas-insulated switchgears(GIS)or cubic type gas-insulated switchgears(C-GIS).It is found that CF3I-N2gas mixtures contained 30%~70%CF3I perform comprehensively better than pure SF6and compressed N2,and especially in medium and low voltage environments,the boiling point of CF3I-N2gas mixture meets the domestic and global requirements in mid-low latitude regions.Therefore we conclude that the gas mixture is acceptable for replacing SF6as the insulation medium in C-GISs.CF3I has been widely considered as a potential alternative for SF6, because it has low global warming potential (GWP) but an insulation capability that is 1.2 times greater than that of SF6. In this paper, the electron swarm parameters of CFaI and its gas mixture with N2, including the effective ionization coefficient and electron drift velocity, are examined theoretically through the Boltzmann equation me- thod in the condition of steady-state Townsend (SST) experiments. Based on the derived data of the limiting field strength of CFaI-N2 gas mixture, taking into consideration of environmental aspects such as GWP, ozone depletion potential (ODP), liquefaction temperature and toxicity, we studied the possibility of applying the gas mixture as the insulation medium in gas-insulated switchgears (GIS) or cubic type gas-insulated switchgears (C-GIS). It is found that CFaI-N2 gas mixtures contained 30%-70% CF3I perform comprehensively better than pure SF6 and compressed N2, and especially in medium and low voltage environments, the boiling point of CFaI-N2 gas mixture meets the domestic and global requirements in mid-low latitude regions. Therefore we conclude that the gas mixture is acceptable for replacing SF6 as the insulation medium in C-GISs.
关 键 词:SF6气体 C-GIS 混合气体 绝缘性能 气体绝缘开关装置 气体混合物 玻尔兹曼方程 地理信息系统
分 类 号:TM213[一般工业技术—材料科学与工程] TM643[电气工程—电工理论与新技术]
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