Power distribution network closed-loop line topology search method and system

The invention discloses a power distribution network closed-loop line topology search method and system, and the method comprises the steps: obtaining a first feeder switch of a to-be-searched power distribution network closed-loop line, storing the first feeder switch in a first layer set, and configuring the number of current search layers to be 1; traversing the first electrical equipment in the set corresponding to the current search layer number, obtaining second electrical equipment which is connected with the first electrical equipment and is not searched based on CN node information of the CIM model, and obtaining a set corresponding to the next search layer number until a second feeder switch of the power distribution network loop closing line exists in the set corresponding to the next search layer number; and starting from the set of the search layer number corresponding to the second feeder switch, backtracking the set of the upper layer, and determining the connection corresponding relation layer