SPACE-CHARGE GENERATION AND NEUTRALIZATION IN A COAXIAL CYLINDRICAL CONFIGURATION IN AIR UNDER A NEGATIVE VOLTAGE IMPULSE

The present study deals with space-charge generation and neutralisatio n, Charge is generated around the central conductor in a coaxial cylin drical electrode configuration in air through the application of a neg ative impulse voltage. The central conductor potential is suddenly bro ught to zero at various times after corona onset, leading to positive streamers and different amounts of space-charge neutralisation. Full n eutralisation is achieved for earthing times close to the peak amplitu de of the impulse voltage while partial neutralisation occurs for long er times, When impulse voltages with fast fronts and long decay times are applied, most of the space charge is neutralised for earthing time s up to 100 mu m.