Applying a gas mixture containing c-C4F8 as an insulation medium

This paper studies the possibility of applying a gas mixture containing c-C₄F₈ in the gas insulation of power equipment. Environmental aspects such as global warming potential, ozone depletion potential, recycling loss and toxicity are discussed. Insulation characteristics of gas mixtures such as c-C₄F₈/N₂, c-C₄F₈/air, and c-C₄F₈/CO ₂ are examined experimentally under a quasi-homogeneous or an inhomogeneous electric field condition. Most of the characteristics are compared with those of SF₆/N₂, which is now widely studied as the most plausible alternative to pure SF₆ for gas insulation. The experimental results, together with the discussion, suggest that gas mixtures containing c-C₄F₈ are possible substitutes for SF₆ and SF₆/N₂