摘要
In this study,dichlorodifluoromethane(R12)gas and mixtures with nitrogen(N_(2))and air at different pressures and mixing ratios have been investigated and showed good alternative to SF_(6) gas in terms of high-voltage application.Mixed gases contain R12 gas,they offer good dielectric properties and possibility to be used in low-temperature environment.Synergistic effects and self-recoverability test have been performed.Dielectric strength under quasi-uniform field showed in the order of SF_(6)>R12>N_(2)>air in alternating current(AC),direct current(DC)and impulse was examined.Mixture R12/N_(2)(80/20%)could reach over 0.90–0.95 times to that of SF_(6) gas at 50 lb/in^(2) at AC and R12/air(70/30%)gives 0.80–0.90 to SF_(6) gas.R12 gas presents brilliant self-recoverability.The optimal ratio to switch SF_(6) gas is R12/N_(2)(80/20%)and R12/air(70/30%)is based on the authors’experimental condition and setup.
