Fault positioning method, device and equipment for secondary equipment of substation

The invention relates to a fault positioning method, device and equipment for secondary equipment of a substation, and the method comprises the steps: constructing a topological network of an intelligent substation according to an SCD file of the intelligent substation, and the topological network comprising the incidence relation among all secondary equipment in the intelligent substation; determining virtual loops among all the secondary devices in the topological network according to the incidence relation among the secondary devices; according to the alarm information of the link abnormality of the virtual loop, determining all topology nodes passed by the virtual loop with broken link; and calculating the fault probability of each topology node through which the broken virtual loop passes according to the alarm information, and checking each topology node in sequence according to the fault probability until the fault node is found. According to the invention, the problem that thefault cannot be timely an