Based on the generalized Stress-Strength Interference Model (gSSIM)

this paper proposes a refined modeling method for describing the probability of 220 kV overhead line failure under a typhoon. Firstly

the typhoon wind field and rainstorm load models are established to portray the changes of wind force and rainfall at the tower location during the typhoon movement. Secondly

the failure mechanism of overhead lines affected by typhoons and rainstorms is studied to quantify the effects of typhoons and rainstorms on the load of lines and towers as well as the angle of wind deflection of conductors

and clarify the typhoon impact process. A refined failure probability model is constructed with comprehensive consideration of tower collapse

line disconnection

and wind-induced flashover. Based on the Sobol global sensitivity analysis

the sensitivity of the failure probability of different overhead line failure modes under typhoon with respect to different variables

such as meteorological parameters and structural parameters of overhead lines. Finally

the proposed fault probability model is verified by taking an actual 220 kV tension-resistant section as an example and building a simulation scenario with the data related to Typhoon No. 13

Pigeon

in 2017

.