STUDY OF IMPULSE CORONA IN AIR AT ATMOSPHERIC PRESSURE

Abstract

In this work, acoustic emissions are studied with respect to corona current pulses. Current pulses may be the starting event for the acoustic pulse. Acoustic pulse shape is same for both d.c. and impulse voltages but the magnitude of the acoustic pulse in impulse conditions are appreciably larger in the order of 10 times. Impulse corona phenomenon presented here is at a stressed anode against a plane cathode, when the gap does not contain any appreciable accumulation of space charge. To study the basic impulse corona phenomenon, experiments were performed at d.c. voltages and then these are extended to impulse voltages. Effect of the humidity and material used for the point electrodes were 4 also studied. Corona sound seems to be less in more humid air while it increases with harder materials.