Impulse breakdown characteristics of CF3I–CO2 at various gas pressure and CF3I content

Kamarudin, Muhammad Saufi, Badrul Sham, Noor Mazliza, Haddad, A. ORCID: https://orcid.org/0000-0003-4153-6146, Baharom, Md Nor Ramdon, Mohd Yousof, Mohd Fairouz and Othman, Nordiana Azlin 2022. Impulse breakdown characteristics of CF3I–CO2 at various gas pressure and CF3I content. Presented at: 7th International Conference on the Applications of Science and Mathematics, 22 - 24 August 2022. Published in: Mustapha, Aida Binti, Shamsuddin, Suhadir, Rizvi, Syed Zuhaib Haider, Asman, Saliza Binti and Jamaian, Siti Suhana eds. Proceedings of the 7th International Conference on the Applications of Science and Mathematics 2021. Springer Proceedings in Physics. Springer Proceedings in Physics , vol.273 Springer; 1999, pp. 405-413. 10.1007/978-981-16-8903-1_35

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Abstract

Sulphur hexafluoride (SF6) is currently the preferred dielectric gas used in medium and high voltage power equipment. However, due to the extremely greenhouse effect by SF6, the search for alternative gas comprising a fluoro-organic gas with low environmental concern mixed with a buffer gas (N2, CO2 and O2) have received considerable attention from the power industry. Trifluoroiodomethane (CF3I) is identified to have an excellent insulation performance with a very low GWP can replace SF6. This paper presents the basic lightning impulse performance of CF3I mixed with CO2 as an alternative to SF6 insulation gas. The 50% breakdown voltage (U50) under both positive and negative polarities were measured at various gas pressure and mixing ratio of CF3I–CO2. The results show that U50 of CF3I–CO2 gas mixtures increases linearly with the pressure, and the difference increases with gap length. Furthermore, an increment of CF3I content in the mixtures increases the insulation strength. It was also found that U50 with negative polarity is much higher than that with positive polarity under the needle-plane electrode and vice versa under the plane-plane configuration. The V-t characteristics for CF3I–CO2 were also analysed under these two different electric fields. The V-t characteristics for plane-plane electrode are more distributed along the wavetail of the lightning impulse under both U50 polarities. As opposed to the V-t waveforms under needle-plane electrode, the instantaneous breakdowns tend to happen earlier. Overall, the results provide a basis for considering the application of CF3I–CO2 as an insulating gas in high voltage apparatus.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	Springer; 1999
ISBN:	978-981-16-8902-4
ISSN:	0930-8989
Last Modified:	17 Oct 2022 16:15
URI:	https://orca.cardiff.ac.uk/id/eprint/153173

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