Negative DC electrical corona interaction with charged dust particles

Abstract

Summary form only given. Presence of dust particles is ubiquitous in many electrical corona applications. In order to study the dust-corona interaction, negative DC corona current pulse shape is studied in presence of fine dust particles. Some of the observed current pulses show multiple avalanches in single corona current pulse when dust particles are present very near to high voltage active electrode. Phenomenon of space charge disturbance, due to charged dust, is explored for its possible explanation. Photographic methods are used for simultaneous measurement of the location and charge of the dust particles, when multiple avalanches occur. Dust charges are estimated from the deflected dust trajectory, due to the influence of electrical, gravitational and gas drag force. For better insight numerical simulation of corona current pulse shape with charged dust particle is also carried out, without and with charged dust.