METHOD AND INSTALLATION FOR FILLING A GAS-INSULATED SWITCHGEAR COMPRISING A MIXTURE OF (CF3)2CFCN AND CO2

摘要

A method and a facility for filling a high- or medium-voltage gas-insulated electrical apparatus in which the insulating gas comprises a mixture of heptafluoroisobutyronitrile ((CF3)2CFCN) and carbon dioxide. The method and the facility using a mixture of (CF3)2CFCN and CO2 in pressurised liquid form which is heated to a temperature no lower than the critical temperature of the mixture.