Breakdown and Corona Characteristics of Rod-to-Plane Gap in Atmospheric Air under AC Voltage

Abstract

The sequence from the corona onset to the complete breakdown accompanied with the applied voltage increase is observed where the diameter of the rod electrode is φ＝2～50 mm, and the gap length is δ＝l mm～30 cm. The negative corona does not vanish until the applied voltage reaches the sparking voltage. Concerning the positive corona, there are three types of the streamer corona, and there exists a discontinuity in the streamer onset voltage characteristics. In some cases, the streamer corona disappears with an increase of voltage. Concerning the spark, two types can be observed : the continuous spark and the intermittent spark. In some cases, the latter disappears with the voltage increase. As for results, the various types of the corona and spark can be classified on the map of the φ-δ plane.