Experimental investigation of the frequency breakdown characteristics of C4-PFN/CO2 mixtures under the nonuniform electric field

The perfluoronitriles and its mixtures have great dielectric strength and are environmentally friendly, which are considered as a typical class of alternative gases. This paper investigates the frequency breakdown characteristics of C4-PFN/CO2 mixtures in the nonuniform electric field. The influences of the electric field distribution, pressure and the C4-PFN component ratio on the dielectric strength of C4-PFN/CO2 mixtures are studied, which is compared with the cases for SF6 under the same conditions. It is shown that the sensitivity of C4-PFN/CO2 mixtures to the nonuniform electric field increases with the increase of the C4-PFN component ratio. For C4-PFN/CO2 mixtures containing more than 5% C4-PFN, the sensitivity is much greater than that of SF6.