Compact 66/77 kV C-GIS That Meets Space-Saving Requirements

N. Masaki
T. Yoshida
K. Kato

Abstract

For improved economy of customers' substation facilities, we have developed a compact 66/77 kV cubicle type gas-insulated switchgear (C-GIS) that realizes enhanced reliability of power supply and a significant saving in installation space.

In order to install all of the devices within the depth of the switchgear and reduce the switchgear size, the devices are combined into a cassette.@ In addition, composite insulation is adopted to further reduce the volume to one-half that of current switchgears.@ The significant size reduction combined with increased freedom of operation enables easy renewal of aging facilities with this C-GIS, which requires only the transformer space of the air-insulated switchgears of 30 years ago.

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