A distribution path phase management support method and a distribution path phase management support system capable of simplifying phase management of a high-voltage distribution path are provided. At the phase management target point provided on the three-phase alternating current distribution path, the voltage value of each line distributing the three-phase alternating current and the noise component superimposed on each line are detected, and the detection result of the voltage value and the detection of the noise component The phase of each line at the phase management target point is estimated by mutual complementation with the result.
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