Research on multi-level loop connection system of auxiliary power system in large power plants

The auxiliary power system of traditional large power plants is characterized by large power supply load, wide power supply range, scattered load points and large capacity of individual motors. It mostly adopts two-level voltage supply and single busbar segmented connection. in operation, there exists a situation where when the main power supply source of this section of the busbar is lost, such as when the adjacent busbar is under maintenance or has a fault, it may block the power supply from the external backup power to other normal busbar sections. The power supply reliability, continuity and operational flexibility of the factory power system are relatively limited. In severe cases, it will increase the probability of accidents. This paper proposes a multi-level loop-connected power supply wiring system for Large Power Plantss. By forming electrical loop-connected wiring through electrical connections at the main power supply distribution center and the remote regional distribution center, the reliability, continuity and operational flexibility of the power plant system are improved, and the accident rate during operation is reduced.