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A substation may not be exclusively for one of the above purposes. A substation may be established primarily for the purpose of bulk power transmission but at the same time may have another transformer installed for stepping down the voltage to a lower level and distribute locally. Sometimes any combination from the above is adopted depending on the requirements.
The other important major elements usually found in the substation are Capacitor bank and Reactor.
A substation has switching arrangements to connect or disconnect these high voltage equipments or elements to the system.
Some important functions that are carried out in the substation are controlling the flow of energy, VAR compensation, voltage control, power factor improvement and measurement and recording of system parameters and initiating proper action.
The switching arrangement is chosen as per the requirement. A substation has many equipments, some of these are circuit breaker, isolator, current transformer, potential transformer, surge absorber, measuring and recording instruments, relay and protective devices, batteries, battery chargers, fire fighting equipments etc.
The substation transformers can be connected several ways.
|Elements of a substation|
|Substation in Building|