Fault location method based on three-phase asymmetric phase current fault component and Euclidean distance

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When a single-phase ground fault occurs in the distribution network, the three-phase current fault components of the fault path and the non-fault path in the system will be difference which can be used as a criterion for fault line selection. However the three-phase load current in the system is much larger than the fault component current, the three-phase phase fault component current is not obvious, which will cause the failure of the method. This paper proposes an improved fault location method based on the three-phase phase current: the fault component of the three-phase current of the system is obtained by subtracting the phase current before the fault occurs from the after. And then the zero-sequence current of this line is subtracted from the fault component to enhances the difference between the lines, and the fundamental amplitude of the result is obtained. The algorithm uses the three-phase fundamental amplitude as the coordinate axis to establish a coordinate system. The difference between the fault path and the non-fault path is enhanced by calculating the Euclidean distance of the three-phase current fundamental amplitude. And the location of the fault section can be judged locally by comparing the overall differences between the lines. In this paper, the specific fault section location process and criteria are proposed, and the feasibility of the method is verified by simulation experiments and actual field data.