Abstract: Aiming at the problem that the current method does not consider the judgment of fault current, resulting in poor fault location and detection effect and low fault location accuracy, a fault locating algorithm for distribution network operation detection based on topological decoupling is proposed. According to the topological structure principle of distribution network with equivalent decoupling, based on the topological adjacency matrix of distribution network, several trunk networks with equivalent decoupling of distribution network are combined, and FTU(Feeder Terminal Unit) feeder terminal equipment is added to each trunk network to divide the single branch of distribution network with FTU. Kirchhoff current law is used to calculate the fault line and judge the fault current direction in the single branch. According to the judgment results, the fault interval judgment matrix is used to locate the operation inspection fault of distribution network. The experimental results show that this method has small error between fault location and actual location, more fault nodes and less false detection times, and its fault location and detection effect is good, which can effectively improve the fault location accuracy.

Key words: topological decoupling,  , distribution network operation inspection,  , fault location,  , feeder terminal unit(FTU) feeder terminal equipment