Title :
Spark decomposition of SF6/H2O mixtures
Author :
Derdouri, A. ; Casanovas, J. ; Grob, R. ; Mathieu, J.
Author_Institution :
Centre de Phys. Atomique, Univ. Paul Sabatier, Toulouse, France
fDate :
12/1/1989 12:00:00 AM
Abstract :
The spark decomposition of mixtures of SF6 (partial pressure from 100 to 500 kPa) and water (concentrations between 600 and 2000 VPM) has been studied. The sparks were generated between a point (stainless steel) and a plane (aluminum) either under 50-Hz AC voltage or by discharging a capacitor. Owing to the high water content the only stable gaseous oxyfluorides detected were, in order of decreasing importance, SOF2 and SO2F2. The yields of these two byproducts have been measured as a function of the number of sparks, the SF6 pressure, and the H2O pressure. When the sparks additionally struck a solid insulator (polytetrafluoroethylene or biphenolic resin), CF4 was detected. Its appearance was paralleled by a sharp increase in the yield of SOF2, whereas that of SO2F2 remained unchanged
Keywords :
electric breakdown of gases; sparks; sulphur compounds; water; 100 to 500 kPa; H2O; SF6; SF6-H2O; biphenolic resin; partial pressure; polytetrafluoroethylene; solid insulator; spark decomposition; stable gaseous oxyfluorides; water content; AC generators; Aluminum; Capacitors; Insulation; Pressure measurement; Resins; Solids; Sparks; Steel; Voltage;
Journal_Title :
Electrical Insulation, IEEE Transactions on
