Method for evaluating risk of line fault caused by forest fire

The invention discloses a method for evaluating risk of line fault caused by a forest fire. The method comprises the following steps: S1, collecting line information, forest fire information, environment information and power grid state information; S2, calculating a correction coefficient of breakdown voltage according to the forest fire information and the environment information; S3, calculating the line breakdown voltage under the forest fire condition, and evaluating the probability of power transmission line tripping caused by line-to-ground breakdown and the probability of power transmission line tripping caused by line inter-phase breakdown; S4, calculating the probability of tripping of the power transmission line under the forest fire condition; and S5, carrying out quantitative analysis on the severity of influence of line tripping on the power grid under the forest fire condition, and evaluating the risk of line fault caused by the forest fire. Differences of design elevations of lines with differ