This paper analyses the characteristics of common methods of fault location using feeder terminal unit (FTU) in AC distribution network. When missing report and false alarm of FTU happen, the matrix method will be wrong, although the intelligent optimization algorithm has a certain fault tolerance rate, but it is easy to fall into local convergence and achieve more complexity. Aiming at the above problems, this paper presents a comparative information search method, obtained by using the distribution network topology of the FTU reservation information compared with the actual reporting information, fault calculation similarity of each area, so as to search the most similar regional information reporting information and reservation, which can effectively reduce the fault location time and improve the accuracy of fault location finally, the normal operation of the distribution network will come. It simulates the single fault of each region in a 5 power distribution system, and the introduction of conditional probability to achieve the missing report and false alarm of FTU, after checking a lot and systematically, it proves that the method is simple and effective, and has a high fault tolerance rate.
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