Power transmission network reliability evaluation method and device based on risk theory

The invention belongs to the technical field of electric power, and discloses a power transmission network reliability evaluation method and device based on a risk theory, and the method comprises the steps: obtaining the fault condition of each line in a power transmission network according to the historical fault data of the power transmission network; the fault condition comprises the fault probability and the average power failure time of each fault type of the line; obtaining each line type according to the service object of each line; the line types comprise important lines and common lines; obtaining an important load loss probability and a common load loss probability of the power transmission network under each fault type based on the fault condition and the line type of each line; and obtaining a preset fault, and inputting the important load loss probability and the common load loss probability of the power transmission network under the preset fault into the risk theoretical formula to obtain a re