Observation of Corona Discharges in Atmospheric Air under AC Voltage

Abstract

The behaviors of the filmy, Trichel and streamer coronas in atmospheric air under AC voltage are investigated by means of the current and light pulse, the synchronous optical shutter, the streak photograph, etc.. By the use of the synchronous shutter, it was made clear that the filmy corona occurs in a positive cycle of the applied voltage, and that the filmy corona occurs together with the Trichel corona at the same voltage. In the sequence of the streamer corona pulses, there can be classified three types of pulses in magnitude and nature. Also, they have inherent patterns respectively in the sequence.