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

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%.