中文摘要：

强风雨荷载的冲击会对输电线路可靠性产生不利影响,有必要研究强风雨荷载下输电系统风险变化情况,建立该情况下输电线路的可靠性模型。基于结构可靠性原理,计算输电线路强度和荷载的随机特性及二者的联合概率密度函数,建立强风雨荷载冲击下输电线路时间相依的失效概率模型。利用IEEE RTS-79算例验证了失效概率模型的有效性,仿真结果表明,强风雨荷载的冲击严重影响系统和部分负荷节点的可靠性指标;在强风雨共同作用时,雨荷载的影响不可忽略。

英文摘要：

The impact of strong wind and rain adversely affects the reliability of transmission lines. A reliability model of transmission lines under strong wind and rain loads is established to study the risk variation of transmission system. Based on the principles of structural reliability,the stochastic properties of transmission line strength and load are researched,their joint probability density function is calculated and the time-dependent failure probability model of transmission line under the impact of strong wind and rain is established. The case study of IEEE RTS 79-bus system verifies the effectiveness of the failure probability model and the simulative results show that,the strong wind and rain loads seriously affect the reliability indices of system and some load nodes,and the rain load can＇t be ignored.