High voltage research (breakdown strengths of gaseous and liquid insulators) and environmental effects of dielectric gases. Semiannual report, April 1-September 30, 1980
Electron attachment rate constants for five halogenated ethylene compounds have been measured in two background gases, and the corresponding attachment cross sections, sigma/sub a/(epsilon), have been calculated. Electron attachment rates have also been measured for two perfluoroalkanes, and attachment cross sections have been calculated. A study of initial decomposition products of n-C/sub 5/F/sub 12/ is also under way. The correlation of breakdown strength to fundamental knowledge continued. Breakdown strength shows strong dependence on the magnitude and energy dependence of the electron attachment cross section; it indicates that the increase in the breakdown voltage, V/sub s/, with increasing attachment saturates, suggesting an upper limit in V/sub s/ of approx. 2.5 times that of SF/sub 6/. The problem of compressibility of some dielectric gases has been treated. A tabulation is presented of most dielectric strengths measured at Oak Ridge National Laboratory. One compound (CF/sub 3/OCH/sub 3/) was synthesized, and in breakdown tests it has demonstrated synergism with SF/sub 6/. Breakdown tests have been performed on several fluoro-chloro-hydrocarbon gases to study further the effect of attachment on dielectric strength. In impulse breakdown measurements, three moderators were compared for use in mixtures with two electron attaching gases. The effect of mixture components and proportions has been observed on corona stabilization of breakdown. The applied testing has concentrated on cylindrical geometry tests with smooth and rough electrodes to systematically determine optimum ternary mixtures of two attaching gases (SF/sub 6/ and c-C/sub 4/F/sub 8/) with one moderating gas (either N/sub 2/ or 1,1,1-C/sub 2/H/sub 3/F/sub 3/ or CHF/sub 3/).
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6668864
- Report Number(s):
- ORNL/TM-7624; TRN: 81-003399
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHLORINATED ALIPHATIC HYDROCARBONS
BREAKDOWN
ELECTRON ATTACHMENT
FLUORINATED ALIPHATIC HYDROCARBONS
GASES
DIELECTRIC PROPERTIES
NITROGEN
SULFUR FLUORIDES
COMPRESSIBILITY
CROSS SECTIONS
DISSOCIATION
ELECTRICAL INSULATORS
EXPERIMENTAL DATA
IONIZATION
LIQUIDS
MEASURING METHODS
ORGANIC FLUORINE COMPOUNDS
PRESSURE DEPENDENCE
DATA
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
MECHANICAL PROPERTIES
NONMETALS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
SULFUR COMPOUNDS
640300* - Atomic
Molecular & Chemical Physics