Liquefied Recovery and DC Discharge Characteristics of Gas Mixtures Containing c-C₄F₈

Abstract

This paper describes two fundamental characteristics of gas mixtures with c-C₄F₈ (perfluorocyclobutane), which the authors have proposed as a possible candidate for substituting SF₆ in gas insulation. One is concerning the release rate of an electro-negative gas from a gas mixture at liquefied recovery. Gas mixtures with c-C₄F₈ have the advantage of much lower release rate over SF₆/N₂. The other is DC discharge characteristics for a hemispherically-capped rod-to-plane gaps. Discharge voltages have been compared between SF₆/N₂, c-C₄F₈/N₂, and c-C₄F₈/CO₂ for a mixing ratio of an electronegative gas up to 20%.