Insulating Characteristics of Gas Mixtures with C3F8/C2F6 and N2/CO2

Since SF6 gas has excellent insulation characteristics and arc-extinguishing performance, it is used for the main equipment in power systems, such as gas-insulated switchgears, gas circuit breakers, and gas-insulated transmission lines. However, due to the problem of its significant global warming effect, SF6 gas was designated at the Third Conference of the Parties to the United Nations Framework Convention on Climate Change in Kyoto in 1997 as a greenhouse gas, emissions of which must be reduced. In the present study, alternative gases were selected from among mixtures excluding SF6 with the need to reduce GWP: Global Warming Potential in mind. Gas mixtures containing such substances and with a boiling point of -25?C or less, chemically stable, non-toxic, and not ozone-depleting were…