Overhead transmission line lightning protection comprehensive evaluation method and system

The invention discloses an overhead transmission line lightning protection comprehensive evaluation method and system, and relates to the technical field of power system protection, and the method comprises the steps: determining the conductivity, grounding impedance, protection configuration and standard radius Rht of soil; randomly generating the current amplitude, the wavefront time, the half-stroke time and the return stroke position of the kht thunder and lightning; the gravity width Ymax of direct lightning stroke is calculated according to an EGM model; judging whether y is greater than Ymax or not, judging whether a simplification criterion is met or not, and judging whether k + 1 is greater than ntot or not; the fault rate is calculated, and different countermeasures are taken according to the fault rate. While the performance is protected, the damage rate of protection equipment such as a lightning arrester is evaluated so as to explore the failure rate of other electrical equipment playing an impor