When planning a 132kV substation, one of the first decisions is whether to specify Gas-Insulated Switchgear (GIS) or conventional Air-Insulated Switchgear (AIS). Both technologies are mature and reliable — the choice depends on space, budget, environment, and maintenance capability.
AIS Substations
AIS uses air as the primary insulation medium. Equipment is larger but individually replaceable and easier to maintain. Lower capital cost makes it the default choice where land is available.
GIS Substations
GIS encapsulates all live components in SF6-filled metal enclosures, reducing footprint by up to 70%. Ideal for urban locations, coastal environments, and sites with high pollution levels.