SF6 properties and use in MV and HV switchgear

The general properties of SF6 gas and its SF6 by-products are presented. A brief history of the use of SF6 in switchgear is given. The effects of SF6 on the environment are discussed. Guidance is given for working with SF6 gas and SF6 filled equipment under normal and abnormal conditions of service. The contents of the present document are based on the technical report IEC 1634, entitled "Use and handling of SF6 HV Switchgear and Controlgear".