Single-phase high-resistance grounding criterion method based on impedance triangular high-voltage overhead line

The invention discloses a high-voltage overhead line single-phase high-resistance grounding criterion method based on an impedance triangle, and belongs to the technical field of power control and protection. The method comprises the following technical steps: 1, constructing a reference impedance triangle; 2, judging a high-resistance grounding fault of the power transmission line, and judging a high-resistance grounding property; a third step of constructing a fault state impedance triangle; and a fourth step of solving a fault distance. Compared with a judgment method which uses simple instruments and equipment and depends on manual line patrol search, the method has the advantages that when the impedance balance point of the fault state impedance triangle falls out of a safety area, high-resistance grounding is judged, otherwise, no high-resistance grounding fault occurs in the line, and the judgment sensitivity and reliable identification of the single-phase high-resistance grounding fault are improved.