Measurement of properties of perfluorocarbon/SF/sub 6/ mixtures relevant to applications

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5154831

Pai, R Y; Christophorou, L G; Sauers, I; Fatheddin, A

It has been found that the addition of 2-C/sub 4/F/sub 8/ to pure SF/sub 6/ or SF/sub 6//N/sub 2/ mixtures has a pronounced effect on the non-uniform field breakdown. This effect can be attributed to increased positive and negative ion production which leads to enhanced space charge effects. If this interpretation is correct, addition of 2-C/sub 4/F/sub 8/ or other perfluorocarbons with large electron attachment rates and low ionization onsets can be used in SF/sub 6/ and SF/sub 6//N/sub 2/ mixtures to modify the space charge behavior of the gas. The formation of carbon as a breakdown product in perfluorocarbon containing dielectric gas mixtures can be suppressed or eliminated by introduction of components such as SF/sub 6/ (or presumably other oxidizer(s)) to react with the discharge products. Mixtures can be formulated with greatly improved dielectric strengths over that of SF/sub 6/ without the disadvantage of carbon formation upon sparking. These investigations of the non-uniform field breakdown and carbon inhibition under sparking of 2-C/sub 4/F/sub 8/ mixtures show that mixtures with superior dielectric strengths (e.g., 20% 2-C/sub 4/F/sub 8//80% SF/sub 6/) under non-uniform field conditions and little or no carbon formation upon sparking are now available. Optimization of these properties is being pursued.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5154831
• Report Number(s): CONF-800922-3
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BREAKDOWN
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DIELECTRIC PROPERTIES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FLUIDS
FLUORIDES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
SULFUR COMPOUNDS
SULFUR FLUORIDES