Process for measuring degradation of sulfur hexafluoride in high voltage systems
A process is described for detecting by-products from electrically induced degradation of SF/sub 6/ in high voltage systems comprising: at a pressure within the reaction cell sufficient to cause electron attachment to SF/sub 6/, placing an SF/sub 6/ gas to be tested in an ion-molecule reaction cell having a cathode at a first end, an anode opposite the cathode at a second end, a pin hole aperture incorporated into the anode that opens into a negative ion mass spectrometer that is at a lower pressure than is the reaction cell; producing thermal electrons at the cathode thereby ionizing molecules of the SF/sub 6/ gas in the vicinity of the cathode to form SF/sub 6//sup -/ ions; applying an electrical field in the reaction cell to induce the transfer of the SF/sub 6//sup -/ ions from the cathode to the anode resulting in the formation of by-product ions from intervening by-product molecules having a high affinity for fluoride ions; introducing a combination of the SF/sub 6//sup -/ ions and the by-product ions into the pin hole aperture thereby effecting flow of the combination of ions from the reaction cell to the negative ion mass spectrometer; and detecting the by-product ions using negative ion mass spectrometry techniques.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4633082
- OSTI ID:
- 6903654
- Country of Publication:
- United States
- Language:
- English
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Process for measuring degradation of sulfur hexafluoride in high voltage systems
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Related Subjects
400400* -- Electrochemistry
AFFINITY
ANIONS
ANODES
APERTURES
BY-PRODUCTS
CATHODES
CHARGED PARTICLE DETECTION
CHARGED PARTICLES
DETECTION
ELECTRIC FIELDS
ELECTRIC POTENTIAL
ELECTRODES
ELECTROLYSIS
ELECTROLYTIC CELLS
ELECTRON ATTACHMENT
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
ION DETECTION
IONIZATION
IONS
LYSIS
MASS SPECTROMETERS
MEASURING INSTRUMENTS
MOLECULES
OPENINGS
PRESSURE DEPENDENCE
RADIATION DETECTION
SPECTROMETERS
SULFUR COMPOUNDS
SULFUR FLUORIDES