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Advances in Materials Science and Engineering
Volume 2018, Article ID 3206132, 4 pages
Research Article

Breakdown Mechanism of Different Sulphur Hexafluoride Gas Mixtures

Electrical Engineering Department, Istanbul Technical University (ITU), Istanbul 34469, Turkey

Correspondence should be addressed to E. Onal; rt.ude.uti@lanoe

Received 15 September 2017; Revised 12 November 2017; Accepted 8 January 2018; Published 1 March 2018

Academic Editor: Santiago Garcia-Granda

Copyright © 2018 E. Onal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Sulphur hexafluoride (SF6) gas and SF6 gas mixtures are widely used in gas-insulated systems (GIS) because they have good dielectric and thermal properties. Among the various gas mixtures investigated so far, SF6-air, SF6-CO2, and SF6-N2 are most used gas mixtures. Also, these mixtures have much technical superiority in GIS. These are nontoxic and nonflammable gases, and they have less sensitivity to nonuniformities and higher liquefaction temperature at high pressure. GIS, switchgears, circuit breakers, and substations are systems that work with alternating current and have nonuniform electric fields. For this reason, in this study the breakdown mechanisms of 0.125, 0.5, 1, and 20% SF6 gas mixtures with rod-plane configuration under AC voltage are investigated and explained breakdown mechanism.