Research for electric energy systems - an annual report

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].…”

“…Following earlier studies with a prototype parallel-plate drift tube [4] , two cylindrical drift tubes have been fabricated and used for ion mobility measurements in room air ionized by corona. The design of the drift tubes differs from those normally used for mobility measurements in that metal guard rings with insulating spacers and alignment rods have been replaced with an insulating cylinder on which guard rings have been coated.…”

“…The length of the drift region is variable so that the distance the ions travel can be made nominally 4 cm or 8 cm.…”

“…A simplified, but conservative two-dimensional model calculation of the perturbed electric field and ion TOF along a path midway between two shutter wires indicates that the trailing edge of the ion cloud which passes through the shutter would have its TOF retarded by about 1.4% for L equal to 4 Because more than one ion species is normally present in the spectrum, the long opening of the shutters also results in the loss of resolution of the individual current maxima.…”

“…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) .…”