Development of the New 24kV Cubicle Type Gas-Insulated Switchgear (C-GIS) Series for Overseas Markets

摘要

A switchgear is a major apparatus that establishes a substation facility. The market calls for a compact and light-weight design, high reliability and safety, and labor-saving maintenance and inspection work. In general markets, there are many customers who value labor-saving installation work at the site in addition to the aforementioned requirements. Some customers may demand a switchgear that does not require sulfur hexafluoride (SF_6) gas handling work (vacuum purging work and gas filling work) during panel installation on-site. In order to meet such requirements, we developed a new type of 24kV Cubicle type Gas Insulated Switchgear (C-GIS). The new 24kV C-GIS employs plug-in type insulated busbars and does not require any gas handling work during on-site panel installation. In addition, the Vacuum Circuit-Breaker (VCB) and disconnecting switch with an earthing switch (EDS) are assembled into an integrated unit configuration. As a result, the newly developed switchgear has a feature realizing 50% reduction in size compared with conventional model.