The after-effect of streamers of positive corona under combined voltage

Abstract

The rise probabilities of positive corona streamers initiated by a flux of negative ions are investigated under the combined voltage (dc + ac) in point-to-coaxial cylinder discharge gaps in atmospheric air. A method is developed to detect and to estimate quantitatively an after-effect of the preceding streamer on the rise probability of the following one during the next cycle of the ac voltage. The method is based on the statistical analysis of sequences of streamers. The dependence of the intensity of the after-effect on dc and ac voltage, ac frequency, pre-ionization level, air humidity and airflow velocity is investigated. The causes of the after-effect of streamers are discussed.

Study on Particle-Induced Corona Discharge in Insulation Systems

“…That results electric field distortion. The streamer head has positive charge density approximately 10 8 -10 20 /m 3 with diameter from 20 to 200 µm [27]. When the streamer disappears, the discharge gap is filled with the space charge of positive ions.…”

“…Townsend's first ionization α expresses the increasing current in exponential rate leading to partial discharge [27]. Let n0 be the number of initial electrons generated from distance (x = 0) from the cathode in electric field's direction.…”