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
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,


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.


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


[1] L. Niemeyer, A Systematic Search for Insulation Gases and Their Environmental Evaluation, New York: Kluwer/Plenum, (1998) 459-464.
[2] T. Rokunohe, Y. Yagihashi, K. Aoyagi, T. Oomori, and F. Endo, Development of SF6-Free 72,5 kV GIS, IEEE Transactions on Power Delivery, 22 (3) (2007).
[3] E. Obame Ndong, Y. Serdyuk, S. Gubanski, R. Summer, U. Hauk, Insulation coordination of hybrid insulation system using N2/O2 gas mixtures, Final report on Chalmers University-Schneider Electric research project, (2012).
[4] T. Oyvang and S. T. Hagen. Coating and Barrier within Medium Voltage GIS (Gas Insulated Switchgear). 20th International Conference on Electricity Distribution, Prague. June 2009. 8-11.
[5] D. Kind and K. Feser, High Voltage Test Techniques, SBA Electrical Engineering Series, (1999) 293-294.
[6] W. Hauschild and W. Mosch, Statistical Techniques for High-Voltage Engineering, Peter Peregrinus Ltd, London, United Kingdom, (1992).
[7] K. Chrzan, J. M. Andino, Electrical Strength of Air Containing Ozone and Nitric Oxides Produced by Intensive Partial Discharges, IEEE Transactions on Dielectrics and Electrical Insulation, 8(4) (2001)
[8] T. Ishida, T Yamada, N. Hayakawa, T. Ueda and H: Okubo, Gas pressure of partial discharge and breakdown characteristics in N2/O2 gas mixtures, Transactions of the Institute of Electrical Engineers of Japan. B, 121-B(4) (2001) 461-466.