Followings are types of substation often referred to in design.
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Substation - An assembly of switchgear or control center equipment supplied directly by feeders or by adjacent transformers.
Main Substation - A substation or switch-yard which supplies all or a major part of the power to the individual substations supplying the onsite and offsite facilities of a complete facility.
Indoor Substation - A substation within a field-constructed or prefabricated building.
Outdoor Substation - Defined by construction type as one of the following: