Title :
The space charge effect on the corona discharge of SF6 gas
Author :
Choi, Seung-kil ; Ha, Duk-Yong ; Ju, Heung-Jin ; Shim, Jae-Hak ; Lee, Cheon ; Kang, Hyung-Boo
Author_Institution :
Dept. of Electr. Eng., Ansan Coll. of Technol., South Korea
fDate :
3/1/2002 12:00:00 AM
Abstract :
In this paper, the characteristics of corona discharge in SF6 gas used as an insulating medium in lots of high-voltage equipment, are simulated by using the finite-element method (FEM) with the flux-corrected transport (FCT) method. The properties of negative corona discharge in needle to plane electrode are analyzed at different discharge stages. For the accurate results, the secondary electron emission by photon and ion as well as Townsend first ionization and electron attachment are considered. The simulation results show that the electric field intensity between anode and ion group decreases according to the electric field distortion by space charge as time goes by. It is also found that the electron density is reduced sharply by the superior electron attachment effect of SF6 gas so that the corona discharge has been extinguished abruptly
Keywords :
SF6 insulation; anodes; corona; electric fields; electron attachment; finite element analysis; ionisation; power apparatus; secondary electron emission; space charge; FEM; SF6; SF6 gas; Townsend first ionization; anode; corona discharge; electric field distortion; electric field intensity; electron attachment; electron density; finite-element method; flux-corrected transport method; high-voltage equipment; insulating medium; ion; needle to plane electrode; negative corona discharge; photon; secondary electron emission; space charge effect; Corona; Current density; Electrodes; Electron emission; Finite element methods; Gas insulation; Ionization; Needles; Power transformer insulation; Space charge;
Journal_Title :
Magnetics, IEEE Transactions on
