Breakdown of CF3I Gas and its Mixtures under Lightning Impulse in Coaxial-GIL Geometry

Lujia Chen (Lead), Muhammad Saufi Kamarudin, Huw Griffiths, Abderrahmane Haddad

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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 model that replicates the maximum electric field of a 400kV 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 4bar.
    Original languageEnglish
    Pages (from-to)1959-1967
    Number of pages9
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Issue number4
    Publication statusPublished - Aug 2016


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