Insulation strength of CF3I-CO2 gas mixtures as an alternative to SF6 in MV switch disconnectors

Widger, Phillip ORCID: https://orcid.org/0000-0002-0662-8590, Griffith, H. and Haddad, Abderrahmane ORCID: https://orcid.org/0000-0003-4153-6146 2018. Insulation strength of CF3I-CO2 gas mixtures as an alternative to SF6 in MV switch disconnectors. IEEE Transactions on Dielectrics and Electrical Insulation 25 (1) , pp. 330-338. 10.1109/TDEI.2018.006932

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Abstract

This paper evaluates the insulation performance of gas mixtures of trifluoroiodomethane and carbon dioxide (CF3I-CO2) in a medium voltage switch disconnector. Practical testing compares the results of CF3I-CO2 against SF6 to examine whether CF3I-CO2 could be a viable alternative when directly substituted into manufactured switch disconnectors in a purely insulating role. Positive standard lightning impulses were applied to the MV switchgear to determine whether CF3I-CO2 can maintain the withstand voltage for which the switch disconnector is rated when filled with SF6. The results show that certain gas mixtures of CF3I-CO2, with a higher concentration of CF3I, could be used to insulate switch disconnectors against standard lightning impulses at the rated pressure.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	IEEE
ISSN:	1070-9878
Date of First Compliant Deposit:	20 March 2018
Date of Acceptance:	21 November 2017
Last Modified:	03 Dec 2024 23:45
URI:	https://orca.cardiff.ac.uk/id/eprint/110055

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