As overhead lines are prone to failure under typhoon disasters

it is crucial to conduct real-time failure risk analysis for overhead lines. As the second paper in the series

this paper continues to take overhead lines under typhoon disaster as the research object

introduces the degradation process into the risk analysis of overhead lines based on the theory of "competitive failure"

and modifies the comprehensive failure probability model of overhead lines under typhoon disaster. Firstly

the degradation process of overhead lines is described as a combination of natural degradation process and instantaneous degradation process

and the natural degradation model is modified for different structures of overhead lines. At the same time

the transient degradation process of overhead lines is re-described based on fatigue loss theory. Finally

based on the competitive failure theory

the failure probability correction model of overhead line under the influence of typhoon disaster is established

which is further combined with the description of the risk division of transient impact at the corresponding moment

and the real-time risk of overhead line is comprehensively evaluated from the perspective of the effect of transient impact. The results of example analysis show that the fault probability correction model proposed in this paper is more suitable for fault risk analysis of overhead lines under typhoon disaster.