8/2/2023 0 Comments Generator one line diagram![]() This changeover is called a manual live changeover. It is essentially a “Make before Break” scheme. In this changeover, the two supplies are Momentarily paralleled and therefore the tie (Bkr B) is automatically tripped. The changeover is done manually with appropriate provisions to ensure synchronism between the station to unit tie-breaker (Bkr B) and the incoming supply (Bkr A). Post synchronization, when the unit reaches approximately 30% load, the supply to the unit bus is switched over to the unit transformer without interruption. During this time the unit bus is fed from the station transformer through the station bus and the respective station to unit ties. Station-to-Unit Transfer: ĭuring the start-up of a unit, there is no power at the Generator terminals. ![]() The following are the types of Bus transfer methods used in any typical power plant. Bus Transfer Methods-Single Line Diagram: The station transformer derive power from EHV buses and deliver it to the station buses 7. For Ex: BFP, AHP and CHP Aux Transformers, Lightning and welding Transformers, etc. In any power plant, the station transformer will get the supply from the grid to provide supply to the auxiliaries which are common to all the units. The UAT derives power from the generator terminals and delivers it to the unit buses. UAT provides the supply to the Unit Auxiliary Loads like ID and FD fans, Mill motors, CW and CEP pump motors, ESP transformers, FOPH transformers, ACW, DMCW, compressor pump motors, etc. If the unit is not running then UAT gets the supply from the station transformer. Unit Auxiliary Transformer will get the Supply from Generator Transformer which is charged only when the unit is running. The GT derives power from the generator terminals and delivers it to the EHV buses. On interruption of supply to various buses, Changeover from one supply to other is resorted using Tie Buses. Station Bus:Īll the auxiliaries which are common to the station are connected to station buses. Unit Bus:Īll the auxiliaries which are required to run for the successful operation of the unit, are connected to unit buses 2. Single Line Diagram of Power Plant- Equipment Description: 1. NC-Normally Closed Status of Circuit Breaker.NO-Normally Open Status of Circuit Breaker.
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