不均匀电场下CF_3I/N_2混合气体工频击穿特性试验

从工频击穿性能的角度探讨CF_3I/N_2混合气体替代SF6气体用于气体绝缘设备的可能性。通过工频击穿试验探究气压、混合比和电极间距三种因素对CF_3I/N_2混合气体工频击穿电压的影响,并与相同条件下的SF6/N2混合气体进行对比分析,提出使用协同效应指数C值判定混合气体协同效应类型及协同效应强弱的定量分析方法。结果表明,随着混合比、气压的升高,CF_3I/N_2混合气体工频击穿性能逐渐接近SF6气体,较高气压下的CF_3I/N_2混合气体更具有应用潜力。CF_3I/N_2混合气体工频击穿电压呈正协同效应,而且CF3I气体具有优良的自恢复绝缘性能。综合考虑工频击穿性能、液化温度和环境影响三种因素,在特定的场合下,CF3I含量为20%~50%的CF_3I/N_2混合气体有可能替代SF6气体用于气体绝缘设备。

Experiment on Power Frequency Puncture of CF3I/N2Gas Mixtures in Non-Uniform Electric Fields

The paper discussed the possibility of CF3I/N2 gas mixtures an alternative to SF6 used in gas-insulated equipment, from the point of the power frequency puncture voltage performance. The influence of gas pressure, mixing ratio and gap distance on power frequency puncture voltage of the CF3I/N2 gas mixtures was studied through power frequency puncture tests. The power frequency puncture voltage of the CF3I/N2 gas mixtures was comparatively analyzed with SF6/N2 gas mixtures. The paper proposed a quantitative analysis method using theCvalue to determine the type and strength of gas mixture synergism. The results show that power frequency puncture voltage performance of CF3I/N2 gas mixtures is gradually approaching to SF6 with the increase of the mixing ratio and gas pressure. CF3I/N2 gas mixtures in relative high pressure have higher application potential. The power frequency puncture voltages of CF3I/N2 gas mixtures presentpositive synergistic effect. Furthermore, CF3I gas has excellent insulating recovery property. Considering the power frequency puncture voltage performance, liquefaction temperature and environmental impacts, CF3I/N2 (The content of CF3I is 20%~50%) gas mixtures may replace SF6 gas for gas-insulated equipment in certain situations.