Breakdown Performance of N2/O2 Gas Mixtures in Quasi-Homogeneous Electric Field

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-V7I11P104

How to Cite?

Elysée OBAME NDONG, Adoum TRAORE NDAMA, "Breakdown Performance of N2/O2 Gas Mixtures in Quasi-Homogeneous Electric Field," SSRG International Journal of Electrical and Electronics Engineering, vol. 7,  no. 11, pp. 22-30, 2020. Crossref, https://doi.org/10.14445/23488379/IJEEE-V7I11P104

Abstract:

AC and lightning impulse breakdown evaluations of 5%, 10%, 21%, 30%, and 40% O2 rate in N2/O2 gas mixtures is performed with different electrode configurations. Measurements are carried out for different inter-electrode distances and gas pressures in a real Schneider Electric WI busbar tank. The aim here is to characterize the mixture's best composition as a possible candidate for the gas part in hybrid insulation systems of SF6–free GIS. The computational breakdown voltage results performed using streamer inception and propagation criteria are also presented compared to experiments for prediction purposes. We observed that breakdown voltage is nonlinear versus oxygen content for the quasi-homogeneous electric field given in this paper. However, the mixtures with 5% O2 and 30% O2 present the higher AC breakdown voltage for relatively low (1 bar) and high (>1 bar) gas pressure, respectively. For lightning impulse breakdown measurement, the mixtures with 5% O2 and 10% O2 show the best dielectric strength for longest (>1 cm) and shortest (1 cm) inter-electrode distance, respectively, regardless of the gas pressure. A good prediction of breakdown voltage using our computational model remains strongly dependent on factor B related to the gas mixture for the case of a quasi-homogeneous electric field.

Keywords:

Breakdown voltage, ionization coefficient, modeling, nitrogen-oxygen gas mixtures, sphere gaps.

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