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Breakdown Characteristics of N2/O2 Gas Mixtures Using 2 cm Diameter Sphere Electrodes

International Journal of Electrical and Electronics Engineering
© 2020 by SSRG - IJEEE Journal
Volume 7 Issue 11
Year of Publication : 2020
Authors : Elysée OBAME NDONG, Adoum TRAORE NDAMA
10.14445/23488379/IJEEE-V7I11P105
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How to Cite?

Elysée OBAME NDONG, Adoum TRAORE NDAMA, "Breakdown Characteristics of N2/O2 Gas Mixtures Using 2 cm Diameter Sphere Electrodes," SSRG International Journal of Electrical and Electronics Engineering, vol. 7,  no. 11, pp. 31-35, 2020. Crossref, https://doi.org/10.14445/23488379/IJEEE-V7I11P105

Abstract:

Flashover voltage of N2/O2 gas mixtures with successively 5%, 10%, 21%, 30%, and 40% O2 rate is measured using 2 cm diameter sphere electrodes configuration. Measurements are carried out in a real Schneider Electric WI busbar tank using different inter-electrode distances and gas pressures. The aim is the characterization of the best composition of the mixture in these electric field conditions as a possible candidate for the gas part in hybrid insulation systems of SF6–free GIS. The results obtained show that breakdown voltage increases logically with the increase of inter-electrode gap distance and gas pressure. But it is nonlinear versus oxygen content. However, the mixtures with 5% O2 shows the higher AC breakdown voltage among the gases tested. For lightning impulse breakdown measurement, the mixtures with 10% O2 and 30% O2 show the best dielectric strength for shortest (>1 cm) and relatively longest (3 and 5 cm) inter-electrode distances respectively, regardless to the gas pressure and the voltage polarity.

Keywords:

AC and lightning impulse breakdown voltages, sphere electrodes, nitrogen-oxygen gas mixtures, GIS.

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