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The barrier effect is well known to increase the breakdown voltage of air gap. While, previous research has suggested that the occurrence of secondary discharge at the underside of barrier accompanied by the development of upper surface corona discharge on the barrier contributes to the reduction of the barrier effect. The properties of the underside discharge are, however, still not well understood...
This study presents an experimental method of determining a two-dimensional image of the gas temperature in atmospheric DC glow corona by spectral imaging. A steady-state glow corona discharge as a partial discharge was generated by applying positive DC voltage to rod-to-plane electrode in synthetic air (N2:79%, O2:21%) at atmospheric pressure. Spectral imaging displays an image, and measures its...
The effect of CO2 concentration on discharge characteristics in atmospheric air was investigated under nonuniform DC field gap. In the experiment, positive DC voltage was applied to 2.0 cm of needle-plane gap in air with CO2 at atmospheric pressure. As a result, a drastic decrease of the withstand voltage of air caused by a dilute increase of CO2 concentration was confirmed. In addition, it was observed...
The frequency characteristics of AC discharge under non-uniform field gap were investigated in synthetic air. In the experiment, the frequency of AC high-voltage (ACHV) f was changed from 1 to 3,000 Hz. The gap distance of a needle to plane electrode was fixed at 1.0, 2.0 and 3.0 cm. As a result, in the case of positive corona observation, the corona mode at the corona onset voltage changed from streamer...
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