Effect of water vapor on the production of S{sub 2}F{sub 10} and S{sub 2}OF{sub 10} by spark discharges in SF{sub 6}
- Oak Ridge National Lab., TN (United States). Health Sciences Research Div.
Because of its toxicity, S{sub 2}F{sub 10} is of concern to users of SF{sub 6}-filled electrical equipment. While no significantly high concentrations of S{sub 2}F{sub 10} has been found in high voltage power equipment, thus far, it is important to understand the mechanism of and the influence of SF{sub 6} impurities on the formation of S{sub 2}F{sub 10} in order to assess the potential buildup of this byproduct in high voltage equipment under a wide range of discharge conditions. Production rates of the compounds disulfur decafluoride (S{sub 2}F{sub 10}) and bis(pentafuorosulfur) oxide (S{sub 2}OF{sub 10}) have been measured following spark discharges in SF{sub 6} as a function of water content for water concentrations in the range 600--3,400 ppm (parts-per-million). Sparks were produced by capacitive discharge (80 J per spark) into SF{sub 6} at a pressure of 100 kPa. Absolute yields were determined from the spark energy from direct measurements of the voltage and current waveforms. In dry SF{sub 6} the spark yield of S{sub 2}F{sub 10} is 2.2 {times} 10{sup {minus}11} mol J{sup {minus}1}. Adding water to SF{sub 6} the spark yield of S{sub 2}F{sub 10} is 2.2 {times} 10{sup {minus}11} mol J{sup {minus}1}. Adding water to SF{sub 6} results in a decrease in the yield of S{sub 2}F{sub 10} and an increase in the S{sub 2}OF{sub 10} yields. Production of both S{sub 2}F{sub 10} and S{sub 2}OF{sub 10} are believed to be formed via the precursor SF{sub 5}. Mechanism for production of these two disulfur compounds will be discussed.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Tennessee Valley Authority, Knoxville, TN (United States); Electric Power Research Inst., Palo Alto, CA (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 201698
- Report Number(s):
- CONF-9509308--1; ON: DE96005433
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
40 CHEMISTRY
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
ELECTRIC SPARKS
EXPERIMENTAL DATA
GAS ANALYSIS
GAS-INSULATED CABLES
GAS-INSULATED SUBSTATIONS
GAS-INSULATED TRANSFORMERS
MOISTURE
OXYFLUORIDES
RADICALS
SAFETY ENGINEERING
SULFUR COMPOUNDS
SULFUR FLUORIDES
SYNTHESIS
TEST FACILITIES