Experimental Investigation of the Electric Discharge Stability: Behaviour with the Air Relative Humidity

Rafika Mestiri; Ramzi Hadaji; Sassi Ben Nasrallah
The stability of the DC electric discharge is very important for its use in different applications. The stability is affected by the appearance of sparks that are very dangerous and may be deadly. To avoid the sparks and to work in a stable condition we must know the parameters that have an influence on the corona discharge stability. In this paper, we investigate the effect of the relative humidity on the direct current electric discharge behaviour. The corona discharge is created between two parallel wire electrodes for aeronautical purpose. Through our experimental study we notice that corona current is not yet interesting when the humidity becomes greater than 50%. Moreover, analysis of corona inception voltage shows that this voltage increases with the relative humidity up to a certain limit after which the corona inception voltage begins to decrease as the air relative humidity increases. We note that the disruption voltage decreases when the humidity increases. Also, the domination of the “Streamer corona” discharge or “Glow corona” discharge is conditioned by the humidity span.
Electrodes; Inception Voltage; Corona Discharge; Disruption Voltage; Stable; Corona Current
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