CORONA CHARACTERISTICS FOR FREE CONDUCTING PARTICLES IN VARIOUS SF6-GAS MIXTURES

This paper reports on experimental investigations concerning the behav ior of pulsative corona discharges from free conducting wire particles of different sizes in parallel plane and concave electrode systems, i nsulated with SF6 and its mixtures with nitrogen N2, triethylamine (C2 H5)3N and perfluorocarbon C8F16O gases. Corona inception and particle lift-off voltages as well as corona charge levels are measured for dif ferent experimental conditions. The results show that corona and parti cle lift-off characteristics are affected by particle parameters, elec trode shape and gas composition. Generally, addition of triethylamine and perfluorocarbon to SF6 reduces the corona charge level.