The present invention is to provide a 1 line earth fault considerations the mutual inductance element to directly interpret the three-phase circuit, and the equilibrium, which can detect and estimate the advantage that no matter how unbalanced the advantages of the two parallel lines. A three-phase two-line parallel distribution system 1 line by direct analysis of the ground fault circuit and benefits estimation method of the present invention, comprising: receiving configuration information for a system comprising a line impedance; Sampling the phase voltage and phase current of the relay installation point; Further comprising: with the configuration information, the phase voltage and phase current of the relay installation point of the system, the fault distance calculation by the relation line between the fault distance is obtained by a direct analysis of the incident system in consideration mutual impedance as a variable; And a step of outputting the calculated fault distance.
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