Title :
Swarm parameters in hexafluoropropene 1-C/sub 3/F/sub 6/
Author :
Wen, C. ; Wetzer, J.M.
Author_Institution :
Dept. of Electr. Eng., Eindhoven Univ. of Technol., Netherlands
Abstract :
Fast swarm measurements have been performed in hexafluoropropene (C/sub 3/F/sub 6/) with pressures (p) ranging from 20 to 200 Torr and E/p values from 80 to 110 V/cm-Torr. The apparent swarm parameters, derived from a simple model (ionization and attachment only), confirm the pressure dependences reported in the literature. The existence of detachment has been identified from the observed time-resolved avalanche-current waveforms. A model that includes detachment and conversion in addition to ionization and attachment processes has been applied to derive the real swarm parameters in C/sub 3/F/sub 6/. The study indicates that two-body collisional detachment and three-body stabilization of the transient anion C/sub 3/F/sub 6//sup -*/ are responsible for the observed pressure dependence of the dielectric strength of C/sub 3/F/sub 6/.<>
Keywords :
electric breakdown of gases; gaseous insulation; organic insulating materials; 20 to 200 Torr; attachment processes; conversion; dielectric strength; existence of detachment; fast swarm measurements; hexafluoropropene; ionization; pressure dependences; swarm parameters; three-body stabilization; time-resolved avalanche-current waveforms; two-body collisional detachment; Curve fitting; Electron mobility; Electron traps; Equations; Extrapolation; Ionization; Temperature dependence; Temperature measurement; Velocity measurement;
Conference_Titel :
Electrical Insulation, 1988., Conference Record of the 1988 IEEE International Symposium on
Conference_Location :
Cambridge, MA, USA
DOI :
10.1109/ELINSL.1988.13880