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Breakdown of CF3I gas and its mixtures under lightning impulse in coaxial-gil geometry

Chen, Lujia ORCID:, Griffiths, Huw, Haddad, Abderrahmane ORCID: and Kamarudin, M. S. 2016. Breakdown of CF3I gas and its mixtures under lightning impulse in coaxial-gil geometry. IEEE Transactions on Dielectrics and Electrical Insulation 23 (4) , pp. 1959-1967. 10.1109/TDEI.2016.7556467

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SF6 is widely used in modern transmission and distribution networks because of its outstanding dual qualities: arc quenching and dielectric insulation. As a gas medium, SF6 is chemically inert, non-toxic, and non-flammable, which makes possible the construction of compact SF6 switchgear. One major known disadvantage of the gas is that it has a global warming potential which is 23,900 times higher than CO2. This has led to research into alternative gases with a much lower environmental impact, and one of the emerging candidates is CF3I. The high boiling temperature of CF3I means that it has to be used as part of a mixture inside gas-insulated equipment. To carry out the investigation on CF3I, a scaled-down coaxial system that replicates the maximum electric field of a 400 kV GIL system was designed and fabricated. The insulation performances of CF3I/CO2 and CF3I/N2 gas mixtures were then examined by measuring the 50% breakdown voltage, U50, using a standard lightning impulse waveform (1.2/50) under absolute pressures of 1 to 4 bar. The experimental results show that CF3I gas mixtures have promising potential as an insulation medium for application in gasinsulated lines.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: IEEE
ISSN: 1070-9878
Date of First Compliant Deposit: 23 November 2016
Date of Acceptance: 2 February 2016
Last Modified: 18 May 2023 00:35

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