High-Voltage Research (Breakdown Strengths of Gaseous and Liquid Insulators) and Environmental Effects of Dielectric Gases. Semiannual Report, October 1, 1980-March 31, 1981

摘要

Electron attachment has been measured to several chlorofluoroethanes and chloroethylenes in both argon and nitrogen at relatively high pressures. The most recently available electron drift velocity data were used to refine calculated electron momentum transfer cross sections in argon, and these were used to refine the electron attachment rates for 1,1-dichloroethane. Electron attachment rates were measured for several chlorocarbons in argon. Electron attachment rates for n-C sub 5 F sub 12 have been extended to higher energies in N sub 2 , and measurements of the electron attachment rate for n-C sub 5 F sub 12 have been made as a function of the total argon pressure. Information is presented on: the basic physics of electron attachment to dielectric gas molecules; dielectric strengths of gases and gas mixtures; impulse and applied studies; synthesis of new dielectric gases; and environmental effects. Studies of liquid dielectrics are discussed. Data are reported for space charges produced by impurity water in benzonitrile. An equation has been derived for space-charge injection by electrolysis of impurities. This equation gives the spatial distribution of the space-charge density as a function of the electrode gap and the fraction of the limiting current that is conducted by the liquid. (ERA citation 06:030548)