Distribution network power failure judgment method and system considering depth effect

The invention belongs to the technical field of power distribution network power failure judgment, and discloses a power distribution network power failure judgment method and system considering a depth effect. Establishing a node connected grid model; judging the real-time operation state of each node in the model, and obtaining a power failure node set; predicting the flow time sequence of the power failure node set, comparing with real-time flow, determining the power failure time of the power failure nodes, and obtaining the latest power failure time T in the power failure nodes; for the line L, counting the node number C of which the power failure duration is longer than the specified time before the T, and calculating the node power failure proportion P; taking the power failure proportion P as evidence to obtain a posterior probability; setting a prior probability threshold, and obtaining a determinacy judgment result according to a posterior probability; if power failure occurs, fault warning and powe