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Commonly used terms in the Electrical industry.
bulk substation
a substation located on a high-voltage transmission line which supplies bulk power to a non-generating utility.
gas substation
an electric power substation in which the conductors are insulated from each other and the ground by a high-pressure gas, generally sulfur hexaflouride.
substation
a junction point in the electric network. The incoming and outgoing lines are connected to a busbar through circuit breakers.
substation battery
a battery used to provide operating energy for the protective relay operations and to initiate circuit breaker operations in a generating substation. The battery is necessary, as the equipment must work reliably during severe voltage sags and outages on the AC system.