A power distribution system comprising a plug-in frame, a board located in the plug-in frame, a position signal acquisition apparatus disposed on the board, a control unit, a positioning structure, and circuit breakers electrically connected to the board, wherein: o the board comprises a plurality of slot positions, o a first end of each of the circuit breakers extends into the plug-in frame and is plugged to a different slot position among the plurality of slot positions on the board, and a second end of the circuit breakers is located at an open end of the plug-in frame; o the position signal acquisition apparatus is configured to acquire an address of any slot position among the plurality of slot positions on the board, wherein each slot position address among the addresses of the plurality of slot positions corresponds to a different circuit breaker among the circuit breakers; o the open end of the plug-in frame is provided with address codes, wherein each address code among the address codes corresponds to a different circuit breaker among the circuit breakers; characterised in that: o the positioning structure is disposed at the open end of the plug-in frame, the address codes are disposed on the positioning structure, and a side, provided with the address codes, of the positioning structure is close to the second end of the circuit breakers, and o the control unit is connected to the position signal acquisition apparatus, and the control unit is configured to monitor in real time address information acquired by the position signal acquisition apparatus, wherein the control unit is further configured to perform the following method steps: ∘ obtaining, from the position signal acquisition apparatus, the addresses of the plurality of slot positions through which the board is electrically connected to the circuit breakers; o determining whether any slot position electrically connected to a circuit breaker is abnormal; o if a certain slot position electrically connected to a certain circuit breaker is abnormal, obtaining a corresponding address code on the plug-in frame in the power distribution system based on the address of the certain slot position; and o determining the certain circuit breaker corresponding to the certain abnormal slot position based on the corresponding address code on the plug-in frame. o the board comprises a plurality of slot positions, o a first end of each of the circuit breakers extends into the plug-in frame and is plugged to a different slot position among the plurality of slot positions on the board, and a second end of the circuit breakers is located at an open end of the plug-in frame; o the position signal acquisition apparatus is configured to acquire an address of any slot position among the plurality of slot positions on the board, wherein each slot position address among the addresses of the plurality of slot positions corresponds to a different circuit breaker among the circuit breakers; o the open end of the plug-in frame is provided with address codes, wherein each address code among the address codes corresponds to a different circuit breaker among the circuit breakers; characterised in that: o the positioning structure is disposed at the open end of the plug-in frame, the address codes are disposed on the positioning structure, and a side, provided with the address codes, of the positioning structure is close to the second end of the circuit breakers, and o the control unit is connected to the position signal acquisition apparatus, and the control unit is configured to monitor in real time address information acquired by the position signal acquisition apparatus, ∘ obtaining, from the position signal acquisition apparatus, the addresses of the plurality of slot positions through which the board is electrically connected to the circuit breakers; o determining whether any slot position electrically connected to a circuit breaker is abnormal; o if a certain slot position electrically connected to a certain circuit breaker is abnormal, obtaining a corresponding address code on the plug-in frame in the power distribution system based on the address of the certain slot position; and o determining the certain circuit breaker corresponding to the certain abnormal slot position based on the corresponding address code on the plug-in frame.