This article focuses on sorting and analyzing the relationship between ATSE automatic transfer switch,STS static transfer switch,SSTS solid-state transfer switch and 0.4kV busbar,clarifying the action time of the transfer device and its role in the distribution system.By introducing the PLC programmable dual power conversion controller and analyzing the application conditions of 0.4kV loop closure with specific engineering cases,the functions of the power supply and distribution system are improved,and uninterrupted power operation is achieved during power system maintenance or fault recovery.
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