C <sub> 4 </ Sub>, The F <sub> 8 </ Sub>, Cf <sub> 4 </ Sub> Gas Mixture Insulation Performance Study

Gas insolation has been widely used in electric power system , SF6 is one of the dielectric . With the developed of the society , people begins pay more attention to the environmental protection , but the SF6 increase the greenhouse effect . We should find the new gas which has the same characteristics as SF6 while the greenhouse effect is less. In this paper we use the apparatus mede by ourselves to investigate the dielectric of c-C4F8 and CF4. the result shows the best ratio of the mixture gas which has best AC-dielectric.