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The phase-to-ground fault occurs frequently in power system, Fault Location is a knotty problem for a long time. This paper presents a novel method to get Fault Current between Adjacent Nodes according to the characteristic of transient current based on WSN (Wireless Sensor Networks). It is used to identify and locate the current fault. The power system is divided into pieces by WSN nodes that could sense the transient three-phase current and identify the fault information based on communication between adjacent nodes. The principle of arranging WSN nodes is also presented. Through the simulation in Matlab, it shows that the method could extract the fault component correctly bypass the influence of variant load and harmonic.