在球-球和尖-板电极下测量了新型环保绝缘混合气体CF3SO2F/N2和CF3SO2F/CO2的工频击穿电压,分析了气压、电极间距和电场不均匀度等因素对混合气体工频击穿特性的影响,并与SF6进行了对比.结果表明:稍不均匀电场下CF3SO2F混合气体的工频击穿电压与气压为正向线性关系,随间距增长击穿电压出现微弱的饱和趋势.极不均匀电场下CF3SO2F混合气体的工频击穿电压随气压变化呈现"上升-下降-上升"的"驼峰"曲线,"驼峰"峰值对应的气压值在0.2~0.35 MPa之间.其中CF3SO2F/N2混合气体的工频击穿电压整体大于CF3SO2F/CO2混合气体.在0.3 MPa及以上,CF3SO2F/N2混合气体在极不均匀电场下仍可保持较高的相对SF6绝缘水平,具备良好的应用潜力.
The power frequency breakdown voltages of a new eco-friendly insulation CF3SO2F/N2 and CF3SO2F/CO2 mixtures were measured under sphere-sphere and needle-plate electrodes.The effects of pressure,electrode spacing,and electric field non-uniformity on the power frequency breakdown characteristics of the CF3SO2F mixtures were analyzed and compared with SF6.The results show that under slightly non-uniform electric field,the power frequency breakdown voltage of CF3SO2F mixtures is linearly related to pressure,and the breakdown voltage show weak saturation trend with the increase of electrode spacing.Under extremely non-uniform electric field,the power frequency breakdown voltages of CF3SO2Fmixtures exhibits"hump"curves of"rising-falling-rising"as the pressure increases,and the corresponding pressure of"hump"peak is between 0.2 MPa and 0.35 MPa.The overall power frequency breakdown strength of the CF3SO2F/N2 mixture is greater than that of the CF3SO2F/CO2 mixture.At 0.3 MPa and above,CF3SO2F/N2 mixtures can maintain a highly insulation level relative to SF6 under extremely non-uniform electric fields,which has good application potential.