Abstract
As a high-risk and small-probability event, typhoon disaster causes great damage to distribution system. A more accurate calculation of failure probability in power system under typhoon disaster can improve the accuracy of risk assessment. However, the existing research used a fixed value when considering load effect to calculate probabilities. Even if randomness was introduced, the solution method was complicated. This paper established a failure probability model of overhead distribution lines under typhoon disasters considering the randomness of load effect. A simpler and faster mathematical statistics method is used to solve the distribution function of the root bending moment of poles. It is concluded that collapsed poles has a more significant impact on failure probability and the introduction of randomness avoids the overestimation of failure probability. Finally, some windproof measures are proposed.
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