Title :
Simulation of corona discharge. Positive corona in SF6
Author :
Liu, Jianfen ; Raju, G. R Govinda
Author_Institution :
Dept. of Electr. Eng., Windsor Univ., Ont., Canada
fDate :
6/1/1994 12:00:00 AM
Abstract :
Positive coronas in SF6 under three voltage levels, 3.0, 3.5 and 4.0 kV, are studied for a 0.5 cm gap between a hyperboloid needle and a plane electrode at a gas number density N=2.12×1018 cm3. The current in the form of a burst of pulses is found to increase with increasing voltage. The initiation and development of successive avalanches are traced as function of time after voltage increases. The development of electron avalanches and streamers are due to ionization and photoionization and quenching of avalanches is due to space charge. The simulation provides a detailed structure of avalanches from which essential differences between positive and negative corona with regard to total field distribution, propagation of successive avalanches and ion distribution can be discerned
Keywords :
Monte Carlo methods; corona; electron avalanches; gaseous insulation; photoionisation; simulation; space charge; sulphur compounds; 0.5 cm; 3 to 4 kV; SF6; avalanche quenching; corona discharge simulation; electron avalanches; hyperboloid needle; ion distribution; ionization; photoionization; plane electrode; positive corona; space charge; streamers; total field distribution; Cathodes; Corona; Electrodes; Electrons; Ionization; Needles; Pulse circuits; Space charge; Sulfur hexafluoride; Voltage;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
