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Communication Dans Un Congrès Année : 2012

Influence of polarity on breakdown voltage of gases in divergent electric field under lightning impulse voltages

Fares Sadaoui
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Abderrahmane Beroual
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Résumé

This paper deals with the influence of the polarity of voltage of different gases (N2, dry Air, SF6 and CO2) and mixtures (SF6-N2, SF6-dry air and SF6-CO2) on breakdown voltage (UBDV) in a sphere-plane and point-plane electrode arrangements under standard lightning impulse voltage stress. It's shown that in point-plane electrode geometry, the negative breakdown voltage UNBDV is always higher than the positive one (UPBDV) for all investigated gases. While in a sphere-plane electrode system, this rule is not respected. Depending on the electrode gap, the type of gas and its pressure, UNBDV can be either lower than UPBDV (dry air), or first higher and then lower or yet first lower and then higher; the inversion appears at a given pressure that it's not the same according to the gas, gap and polarity. For gas mixtures, UNBDV is always higher than UPBDV whatever SF6 content.
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Dates et versions

hal-00765350 , version 1 (14-12-2012)

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Fares Sadaoui, Abderrahmane Beroual. Influence of polarity on breakdown voltage of gases in divergent electric field under lightning impulse voltages. ICHVE, Sep 2012, Shanghai, China. pp.496 - 499, ⟨10.1109/ICHVE.2012.6357035⟩. ⟨hal-00765350⟩
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