This paper proposes a control strategy for a remote standby automatic transfer system to enhance the power supply security of small-scale distribution networks with a two-station single-chain power supply structure.This strategy is based on a peer-to-peer communication control mode without a master

utilizing millisecond-level real-time interaction information to automatically identify open points

locate faults

rapidly isolate faults

disconnect small power sources

restore power supply

and automatically identify and lock out load-shedding from the stable system.It also leverages the unified low-voltage standardized device hardware from the State Grid Corporation without changing the definition of the interface

such as input

output

analog

and power

while adding a dedicated communication module to the CPU board.This model reduces cost and facilitates on-site construction and upgrade transformations.Both RTDS simulation tests and field applications verify the effectiveness of this control strategy

offering insights into similar studies for other regions with comparable grid structures.