Influence of O{sub 2} and H{sub 2}O on the spark decomposition of SF{sub 6} and SF{sub 6} + 50% CF{sub 4} mixtures
- Univ. Paul Sabatier, Toulouse (France)
The spark decomposition of SF{sub 6} and SF{sub 6} + 50% CF{sub 4} mixtures was studied at a gas pressure of 200 kPa. The sparks were generated between a point and a plane either under 50 Hz ac voltage (0.09 J per spark) or by discharging a capacitor (3.59 J per spark). The attention was only focused on the gaseous SF{sub 6} by-products: SOF{sub 2} + SF{sub 4}, SOF{sub 4}, SO{sub 2}F{sub 2}, S{sub 2}F{sub 10}, S{sub 2} OF{sub 10}, S{sub 2}O{sub 2}F{sub 10} and S{sub 2}O{sub 3}F{sub 6} which were assayed by gas chromatography. Their yields were studied varying the cell preparation technique, the metal constituting the plane electrode (aluminum, copper, stainless-steel) and the concentrations of two additives, O{sub 2} (between 0 and 1%) and H{sub 2}O (between 0 and 0.2%). The cell preparation procedure had a strong effect on the formation of all products except SOF{sub 2} + SF{sub 4}. The aluminum led, whatever the procedure used, to the highest levels of products. With SF{sub 6} as well as with the SF{sub 6} + 50% CF{sub 4} mixtures and whatever the spark energy, an increase of the oxygen content led to a decrease of SOF{sub 2} + SF{sub 4} and S{sub 2}F{sub 10} production rates and to an increase of that of SOF{sub 4} + SO{sub 2}F{sub 2}. Moreover, an increase of the H{sub 2}O content induced a lowering of the S{sub 2}F{sub 10} production rate and an increase of those of SOF{sub 2} + SF{sub 4} and SOF{sub 4} + SO{sub 2}F{sub 2}. With the SF{sub 6} + 50% CF{sub 4} mixture and by-products production rates were lower (10 to 50% depending on the by-product considered and on the O{sub 2} or H{sub 2}O concentration) than those measured with pure SF{sub 6}.
- OSTI ID:
- 529645
- Report Number(s):
- CONF-960614-; ISBN 0-7803-3531-7; TRN: IM9742%%134
- Resource Relation:
- Conference: 1996 IEEE international symposium on electrical insulation, Montreal (Canada), 16-19 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of Conference record of the 1996 IEEE international symposium on electrical insulation. Volume 2; PB: 477 p.
- Country of Publication:
- United States
- Language:
- English
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