Surface insulation performance of atmospheric and fluorinated insulating gases at highly divergent electric field conditions

Michelarakis, Michail ORCID: https://orcid.org/0000-0003-2862-4539, Mavidou, Sofia ORCID: https://orcid.org/0000-0001-8049-7392, Slama, Mohammed El Amine, Stone, Christopher, Clark, David ORCID: https://orcid.org/0000-0002-1090-2361 and Haddad, A (Manu) ORCID: https://orcid.org/0000-0003-4153-6146 2024. Surface insulation performance of atmospheric and fluorinated insulating gases at highly divergent electric field conditions. Presented at: 23rd International Symposium on High Voltage Engineering (ISH 2023), Glasgow, UK, 28 August - 1 September 2023. IET Conference Proceedings. , vol.2023 (46) pp. 829-834. 10.1049/icp.2024.0669

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Abstract

This paper examines the surface insulation performance of atmospheric gases, namely, technical air (21/79% O2/N2), nitrogen (N2), carbon dioxide (CO2) and the gas mixture of 4% fluoronitrile (C4F7N) balanced with CO2. The test configuration replicates the contact region between charged metal conductor and solid dielectric both surrounded by the gaseous insulation medium. Three polymers, namely, polytetrafluoroethylene (PTFE), polyether-ether-ketone (PEEK) and polyvinylidene-fluoride (PVDF), of different relative permittivities are tested. The test object is subjected to alternating (AC) voltage waveform at power frequency (50Hz) and the partial discharge inception voltage (PDIV) and flashover voltage (FOV) levels are identified. The obtained results showed that both PDIV and FOV decrease with the increase of the relative permittivity of the solid dielectric with slight variation in the sequence of the atmospheric gases with regards to their performance. The binary mixture of 4/96% C4F7N/CO2was found to be better than technical air and N2. However, it was found to be comparable to that of CO2, in some cases as discussed in the paper.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Engineering
Last Modified:	26 Nov 2024 13:46
URI:	https://orca.cardiff.ac.uk/id/eprint/174204

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