Specification and Application of SF6 Compressed Gas Insulated Switchgear A Utility's Point of View

The introduction and application of a new technology, SF6 compressed gas insulated (CGI) switchgear has resuled in some problems not foreseen by the users nor are they adequately provided for in the existing standards for conventional switchgear. This paper discusses the accumulated experience of the B.C. Hydro and Power Authority in the areas of planning, specifications, tender evaluation, testing and operation of 550 kV and 230 kV minisubstations. Particular emphasis is placed on the need for national and international standards specially framed for CGI switchgear and for in-depth knowledge by present and potential users of this equipment.