Electron Swarms Parameters in CF₃SO₂F as an Alternative Gas to SF₆

Abstract

The electron swarms parameters of trifluoromethanesulfonyl fluoride (CF 3 SO 2 F) with a low value of global warming potential (GWP) of 3678 were measured for a range of reduced electric fields (per gas density N) E/N from 400 to 750 Td at room temperature (20 °C). The discharge parameters such as the reduced Townsend first ionization coefficient α/N, the reduced attachment coefficient η/N, and the reduced effective ionization coefficients (α−η)/N are obtained by using the steady-state Townsend method. The comparison of the experimental results with those of SF 6 , a kind of the most widely used insulation gas, indicates that CF 3 SO 2 F has a better insulation performance than SF 6 because of a much higher reduced critical electric field of 578.8 Td.

Research and Analysis of Insulating Gas in Unified Test Conditions

“…It can be seen from Figure , that the error between the effective value of the AC breakdown voltage of SF 6 gas and the values reported in refs and under uniform test conditions was 3%. The test shows that the platform was reliable and can be used to perform power frequency breakdown of typical gases.…”

“…Two synthetic gases were considered to have the potential to replace SF 6 (CF 3 SO 2 F). According to reports, , the GWP values of these two gases are both less than 20% of SF 6 . Therefore, the gas has a stable presence in the atmosphere for less than 40 years, which is much lower than the 3400 years of SF 6 gas.…”

Dielectric Properties of CF3SO2F/N2 and CF3SO2F/CO2 Mixtures as a Substitute to SF6

“…Therefore, the breakdown voltage of N 2 is higher than that of CO 2 . Although the E vip of CF 3 SO 2 F is the lowest among the three kinds of molecules, CF 3 SO 2 F is an electronegative gas, 26 which effectively hinders the development of discharges due to the strong adhesion of free electrons. Compared with N 2 and CO 2 , which have almost no electron adhesion cross section, CF 3 SO 2 F has higher dielectric strength.…”

“…The breakdown strength of 0.1 MPa CF 3 SO 2 F was 1.38-fold of SF 6 , 22 which is in good agreement with the predicted value of new SAR. 21 Long et al 26 obtained the electron swarms parameters of pure CF 3 SO 2 F through the steady-state Townsend (SST) method. The test results showed that the critical insulation strength of CF 3 SO 2 F was ∼1.6-fold that of SF 6 .…”

“…Long et al obtained the electron swarms parameters of pure CF 3 SO 2 F through the steady-state Townsend (SST) method. The test results showed that the critical insulation strength of CF 3 SO 2 F was ∼1.6-fold that of SF 6 . The above studies revealed that CF 3 SO 2 F and its mixtures were promising substitutes to SF 6 , which had good industrialization prospects in the field of gas insulation, which are prospects of further research.…”