DocumentCode :
784660
Title :
Neutral Decomposition Products in Spark Breakdown of SF6
Author :
Sauers, I. ; Ellis, H.W. ; Christophorou, L.G.
Author_Institution :
Atomic, Molecular and High Voltage Physics Group Health and Safety Research Division Oak Ridge National Laboratory Oak Ridge, TN
Issue :
2
fYear :
1986
fDate :
4/1/1986 12:00:00 AM
Firstpage :
111
Lastpage :
120
Abstract :
The formation of decomposition by-products produced by electrical spark discharges in SF6 has been investigated by quadrupole mass spectrometry. The by-product SF4 was found to be a precursor to many of the long-lived decomposition by-products identified (SOF2, HF, SO2, and SiF4). The amount of SF4 formed was measured by "in situ" detection, utilizing a "threshold" technique for monitoring the SF4 ion (SF+3) in an SF6 background. The rate constant for the hydrolysis of SF4 was measured (at 350 K) and found to be ~2×10-19 cm3s-1. In addition to moisture, the effects of SiO2 and electrode material have been briefly examined. Quantification of the amounts of long-lived by-products of spark discharge in SF6 yielded the following ranking: SOF2 > SOF4 > SiF4 > S02F2 > SO2. The energy and pressure dependences in the ranges of 0.5 to 14.5 J/spark and 40 to 233 kPa respectively, of the amounts of the various by - products were examined.
Keywords :
Chemical products; Dielectrics and electrical insulation; Electric breakdown; Electrodes; Hafnium; Laboratories; Mass spectroscopy; Sparks; Sulfur hexafluoride; Toxic chemicals;
fLanguage :
English
Journal_Title :
Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9367
Type :
jour
DOI :
10.1109/TEI.1986.348932
Filename :
4156941
Link To Document :
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