Leader discharges in SF₆

Abstract

Production rates of the compounds disulfur dedlwxide (S2F,3 and bis@entafimrosulfur) oxide (S20FI,) have been measmd following spark discharges m SF, as a hction of water content for vvater cmwmmbsm the range 600-3400 ppm (parts-per-million). Sparks were produced by capacitive discharge (80 J per spark) into SF, at a pressme of 100 kPa. Absolute yields were determined h m the spark energy h m direct measurement of the voltage and current waveforms In dry SF, the spark yield of S,F,, is 2.2 x IO-" mol +I. Addiag water to SF, results m a decrease m the yield of SP,, and an increase m the S20F,, yield Prodnaion of both w,, and &OF,, are believed to be formed via the precursor SF, lbkhamm. for production of these two disulfur compounds will be discussed Dlmlj4u Decqfluorrrie &F1J, a D ~ C O M ~ S Z ~ ~ O ~ h n z b e r o f Elecb?cal&S~essedSFe" In Vitro, 25(8), 673-675 (1989). [lo] Van Brunt, R J., O l d t o e J. IC., Firebaugh, S. L., and Sauas, I., "Mepnvemenr of Sple S,OF,,, a n d S @ p ~ ~ PraductIon h e s from S p k and Negatrve Glow Corona Ducharge m SFdo, Gas Mrrtwes,'~ The Eleventh htexnational Conference on Gas Discharges and Their Appiications, Tokyo, Japan, (1 995). [ 111 Sauers, L and Cacheiro, R A, "A Cpgenzc Enrichment Technque for Gpp Chromatogqhc Detect~on ofSzF;o m SF6 Discharges, " Conference

Effect of micro-fillers in polytetrafluoroethylene insulators on the characteristics of surface discharges in presence of SF6, CO2 and SF6-CO2 mixture

“…By the way the capacitance of the system is also increased along with the electrical charge [27]. This can be also validated by differential capacity concept against the dielectric constant of insulator and its thickness, and the radius of discharge channel [26,[28][29][30]. Such a result has been observed when analysing the creeping discharges propagating over solid/liquid interfaces [26].…”

Light Emission Spectrum Depending on Propagation of Partial Discharge in SF<inf>6</inf>

“…Generally, the PD in SF6 gas is represented by repeat transition from streamer to leader discharge, at last results in breakdown (BD) [1][2][3][4][5][6]. However, since the PD under nonuniform electric field is complicated, the PD phenomena such as generating/progress characteristics are not clear.…”

Investigation on creeping discharges propagating over pressboard immersed in mineral and vegetable oils submitted to lightning impulse voltages

“…By the way the capacitance of the system is also increased and thence the electrical charge [6]. This can be also validated by differential capacity concept versus the dielectric constant of insulator and its thickness, and the radius of discharge channel [7,8]. For a thin pressboard (e=2 mm), L f is longer with untreated vegetable oil than in treated vegetable oil ( Figure 5).…”