The invention discloses a low-
voltage power distribution network topological relation 
online identification and monitoring method. The method comprises the following steps of 1, using an 
integrated controller to send a turn-on instruction to an identification 
current generator at a user terminal, and enabling each 
branch current 
detector to monitor the current state information of a 
branch in realtime and upload the current state information to the 
integrated controller; 2, when the centralized controller senses that a characteristic current flows through the 
branch current 
detector of the branch, recording an address code; turning on other identification current generators one by one in a time-sharing manner; 3, enabling the centralized controller to complete the 
transformer area topology on-line identification and monitoring through the logic calculation and according to the address code. According to the method, on the basis of not changing an original circuit, and by installing the centralized controller, the 
branch current detectors and the identification current generators, the low-
voltage power distribution 
network topology structure is obtained, and the change of the powerdistribution 
network topology structure can be monitored on line in real time, the low-
voltage network topology structure can be monitored and reported real-timely, and the power supply reliability and the 
power grid operation and 
maintenance management level are improved.