AC Creepage discharges in SF6, Co2, N2, and SF6-CO2 and SF6-N2 mixtures

Fares Sadaoui (1) , Abderrahmane Beroual (1)

1 EE - Ampère, Département Energie Electrique

This paper deals with the experimental study of creepage discharges propagating over insulators made of different materials namely Glass, Epoxy resin and Bakelite, under AC voltage. The mainly investigated parameters are the morphology of discharges and their stopping lengths Lf versus the voltage magnitude, the type and thickness of insulator, the type of gas/gaseous mixture and pressure. The gases and mixtures we considered are N2, SF6, CO2, SF6-N2 and SF6-CO2. It’s shown that Lf increases quasi-linearly with the voltage; it decreases when the thickness is increased and/or the dielectric constant of insulator decreases, thus indicating the important role of electric field and capacitive effects in the propagation mechanism. On the other hand, the increase of SF6 content in SF6-CO2 and SF6-N2 mixture leads to a significant decrease of the length of discharges.

Domaines: Energie électrique

Fares Sadaoui, Abderrahmane Beroual. AC Creepage discharges in SF6, Co2, N2, and SF6-CO2 and SF6-N2 mixtures. ISH, Aug 2013, Séoul, South Korea. pp.OE8-04. ⟨hal-00921845⟩