z-logo
Premium
Negative Corona Current Pulses in SF 6 – Air Mixtures
Author(s) -
Kúdelčík J.,
Zahoranová A.,
Choma K.,
Černák M.
Publication year - 2002
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/1521-3986(200208)42:5<546::aid-ctpp546>3.0.co;2-3
Subject(s) - cathode , materials science , corona discharge , corona (planetary geology) , ionization , atomic physics , current (fluid) , atmospheric pressure , waveform , graphite , electron , analytical chemistry (journal) , ion , electrode , voltage , chemistry , physics , meteorology , composite material , thermodynamics , nuclear physics , organic chemistry , quantum mechanics , chromatography , astrobiology , venus
Abstract Current waveforms of first negative corona pulses have been measured in dry air + SF 6 mixtures at a pressure of 50 kPa and various overvoltages. Effects of changing cathode secondary electron emission were studied using a copper cathode coated by CuI and graphite. It is concluded that in the mixtures containing less than 10 % of SF 6 the negative corona pulse is associated with the formation of a cathode‐directed streamer in the immediate vicinity of the cathode. In the mixtures containing more than 20 % of SF 6 the streamer is quenched and, consequently, the discharge is governed by the Townsend ionisation mechanism fed by cathode photoemission processes.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here