Identification of corona discharge-induced SF6 oxidation mechanisms using SF6/18O2/H2 16O and SF6/16O2/H2 18O gas mixtures

Research for electric energy systems -- an annual report

“…These ions result predominantly from reactions of SFg with S0F 4 and SiF 4 which are present in the SF 6 at trace levels and result from the decomposition of SF 6 in the discharge [19,20].…”

“…The present model considers, for example, the F' transfer reaction [14,20] SF, S0F 4 S0F 5 + SF 5 , kj = 2.0 x 10' 10 cm 3 /s (5) in predicting the rate for S0F 4 production. There is evidence [20] (5) .…”

“…There is evidence [20] (5) . This latter condition is likely to be reached for the experimental situations considered here.…”

“…It will be assumed here for convenience that the vessel which defines r t is a sphere centered at r c with a radius R w , where R w » R. It has been shown by Van Brunt and Siddagangappa [20] from mass spectrometric measurements made using the mixture SF 6 [0 2 ] suggest that these products are predominantly formed by the slow gas -phase reactions ( 7 ) and ( 8 ) that occur in the main gas volume. The rate for reaction (7) has been measured by Sauers and coworkers [40], and for reaction (8) an upper limit was determined by Plumb and Ryan [38].…”

Research for electric energy systems - an annual report

“…Model for Corona Discharge-Induced Decomposition of SF 6 In this section we discuss a chemical-kinetics model for oxidation of SF 6 [31], [55][56][57][58][59]; 2) The yields for SOF 4 can exhibit nonlinearities that suggest a destruction process for this species with a rate proportional to the amount of SOF 4 present in the gas at any given time [56] [25,31].…”