Substation auxiliary power supply System: The Complete Guide !
We know that Substation is a place where Power Flow/Transmission takes place, but it also, has its own Power Consumption.
The purpose of Auxiliary Power Supply system in the Substation, is to Power-up/ Energize various Electrical Equipment/Devices used in the substation and the yard.
These Devices are very Critical for proper Operation of the Protection Systems in case of Faults and so there should be No Interruption to their Power Supply.
There are two types of Station Auxiliary Power Supplies: In the Diagram given below, the Red colored part of the Diagram is the DC Supply System and the rest is the AC Supply System.
| Part | Details |
|---|---|
| AC Supply System: AC power is required for substation lighting, heating, ventilation and Motors used in Operating Mechanism of various Switchgear. Some of the Equipment used in AC Power Supply System are Station Auxiliary Transformer, DG Set, ACDB, etc. Generally Voltage of 240 V or 415 V AC is used. | Read More |
DC supply System: It is used for Essential Loads such as, Power Supply to Relays & Meters, Energizing Tripping and Closing Coils of Circuit Breaker, DC Emergency Lightning in Control Room, etc. Equipments used in Substation DC Power Supply System are as follows: Battery Set, Battery Charger, DCDB, etc. Generally DC Voltage of 110 V or 220 V DC is used. | Read More |
In the AC Supply System, if the Station Transformer fails to provide the AC Supply, the DG Set comes into picture either Automatically or Manually and supples the AC Supply.
When there is absolutely No AC Supply, Battery Set provides the DC Supply to the DC Loads automatically, But when there is proper AC Power Supply, the Battery Charger Provides the DC Supply to the DC Loads, as well as, Battery Set.
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