Composite gaseous insulation containing highly fluorinated organic compounds for electrical apparatus

Claim 1

ELECTRICAL APPARATUS COMPRISING, IN COMBINATION, A CASING, AN ELECTRICAL CONDUCTOR IN THE CASING ANS A COMPOSITE GASEOUS DIELECTRIC IN THE CASING AND SURROUNDING THE ENTIRE CONDUCTOR AND COMPRISING THE SOLE FLUID DIELECTRIC FOR THE CONDUCTOR, THE GASEOUS DIELECTRIC COMPRISING NITROGEN GAS AS THE MAJOR VOLUMETRIC COMPONENT AND FROM 0.003 TO 0.25 POUND PER CUBIC FOOT THEREOF OF THE VAPOR OF A FLUORINATED ORGANIC COMPOUND, THE FLUORINATED ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDROCARBONS, HYDROCARBON ETHERS AND TERTIARY HYDROCARBON AMINES IN WHICH ALL OF THE HYDROGEN ATOMS HAVE BEEN SUBSTITUTED BY AT LEAST ONE HALOGEN SELECTED FROM THE GROUP CONSISTING OF FLUORINE AND CHLORINE, AND AT LEAST 75 ATOM PERCENT OF THE HALGEN BEING COMPOSED OF FLUORINE, THE FLUORINATED ORGANIC COMPOUND HAVING A PARTIAL PRESSURE OF AT LEAST 3 MM. OF MERCURY AT 25*C., THE MOLECULES OF THE FLUORINATED ORGANIC COMPOUND HAVING AT LEAST FOUR CARBON ATOMS, THE VAPORS PROVIDING FOR AN INCREASE OF DIELECTRIC STRENGTH OF THE GASEOUS DIELECTRIC OF AT LEAST ABOUT 50% OVER THAT OF THE NITROGEN ALONE.