Power distribution network single-phase earth fault positioning method and system based on edge calculation

The invention discloses a power distribution network single-phase earth fault positioning method and system based on edge calculation, and the method comprises the steps: continuously obtaining the three-phase current of a line through a fault indicator disposed on the line, and synthesizing the three-phase current into a zero-sequence current; the zero-sequence current amplitude is compared with a set threshold value, and a line section where a power distribution network fault occurs is pre-judged; starting a fault type sensing algorithm for the line section where the power distribution network fault is pre-judged to occur, distinguishing the fault type by adopting a self-adaptive mode, and selecting a transient process algorithm or a steady-state process algorithm corresponding to the distinguished fault type to calculate the acquired three-phase current of the line; and in combination with the transient current characteristics of the phase current obtained by the transient process algorithm and the steady-