High voltage research (breakdown strengths of gaseous and liquid insulators). Third quarterly report for period ending December 31, 1976. [C/sub 6/F/sub 10/, C/sub 6/F/sub 12/, C/sub 4/F/sub 6/, C/sub 3/F/sub 8/ with N/sub 2/, SF/sub 6/, c-C/sub 4/F/sub 8/, iso-C/sub 4/F/sub 8/]

Technical Report · Tue Feb 01 00:00:00 EST 1977

DOI:https://doi.org/10.2172/7110751· OSTI ID:7110751

Christophorou, L. G.; James, D. R.; Pai, R. Y.; Pace, M. O.; Mathis, R. A.; Bouldin, D. W.; Tittle, D. E.

The systematic basic and applied work to improve gaseous dielectrics continued. The breakdown strengths of C/sub 6/F/sub 10/ (perfluorocyclohexene) and C/sub 6/F/sub 12/ (mixture of 1,2- and 1,3-perfluorodimethylcyclobutane) have been found to be, respectively, 2.3 to 2.4 and 1.9 to 2.2 times higher than SF/sub 6/ under identical experimental conditions. The breakdown strengths of mixtures of C/sub 4/F/sub 6/, SF/sub 6/, c-C/sub 4/F/sub 8/, iso-C/sub 4/F/sub 8/, and C/sub 3/F/sub 8/ with N/sub 2/ have been studied systematically in various combinations in an effort to understand the role of the basic properties and effectiveness of each component of a multicomponent gas on the breakdown strength. A number of such mixtures (e.g., 20 percent C/sub 4/F/sub 6/, 20 percent SF/sub 6/, and 60 percent N/sub 2/) are better and cheaper than SF/sub 6/. Basic electron attachment data have been obtained for C/sub 3/F/sub 8/, and the overall effectiveness of inelastic processes has been assessed for a number of gases based on their electron transport coefficients. Work on our new high-pressure, high-voltage and variable temperature (-40 to +120/sup 0/C) chamber for uniform-field breakdown tests proceeded well. Design of apparatus for breakdown testing with nonuniform fields and/or rough surfaces has begun; concentric-cylinder field electrodes of varied surface roughness are under fabrication. Plans are underway for an International Symposium on Gaseous Dielectrics to be sponsored by ORNL-ERDA-EPRI.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: US Energy Research and Development Administration (ERDA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 7110751
• Report Number(s): ORNL/TM-5806
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FLUORINATED ALICYCLIC HYDROCARBONS
DIELECTRIC PROPERTIES
FLUORINATED ALIPHATIC HYDROCARBONS
SULFUR FLUORIDES
BREAKDOWN
CARBON FLUORIDES
DIELECTRIC MATERIALS
ELECTRON ATTACHMENT
GASES
ORGANIC FLUORINE COMPOUNDS
CARBON COMPOUNDS
ELECTRICAL PROPERTIES
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALICYCLIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
SULFUR COMPOUNDS
360603* - Materials- Properties