Power distribution network reliability evaluation method and device, terminal and medium

The invention discloses a power distribution network reliability evaluation method and device, a terminal and a medium, and relates to the technical field of power distribution. According to topological information of a power distribution network, a connection relation among each power supply point, each load point and a transfer switch in the power distribution network is determined, and an available power supply path of each load point is determined; based on the available power supply path information, the fault probability and the single fault duration of each load point when each power supply point in the system supplies power independently are superposed and corrected, so that the overall reliability of the power distribution network under the variable topology condition containing the transfer switch is accurately reflected. The technical problem that an existing power distribution network power supply reliability evaluation means is difficult to accurately evaluate the reliability under the condition