Distribution network grounding line selection method employing recombination current phase detection

The invention relates to a distribution network grounding line selection method employing recombination current phase detection. The distribution network grounding line selection method can determine whether a circuit is connected to the ground through determining whther Phi ALL(A)-PhiD(A)>Eps is established in a first circuit of a grounding fault phase through recording bus three-phase voltage and waveforms of outgoing line three-phase current, wherein the Phi ALL (A) is a phase angle of voltage and current after the grounding fault, Phi D (A) is a power factor angle before the grounding fault ), and Eps is a smallest phase angle difference between the recombination current and load current, if established, determining the circuit is the grounding fault circuit and outputting the name of a faulty line. The distribution network grounding line selection method is simple in process and reliable in action. The fault line selection does not need flinging and cutting outlet switches, and uninterrupted electric lin