摘要
针对复合绝缘子在长期微风振动下易发生疲劳破坏问题,以某500 kV线路为例,计算导线在微风振动下线夹出口处的最大动弯应力,根据导线悬挂角度获得由导线振动传递给悬垂复合绝缘子的振动荷载值。并基于ANSYS软件建立复合绝缘子实体模型,采用威布尔分布函数描述振动频率的概率分布,结合Miner线性疲劳损伤累积法则计算其疲劳寿命。实例应用结果表明,该方法简单、合理。
Composite insulator is frequently subjected to fatigue failure in the condition of aeolian-vibration for long period.Taking 500 kV transmission line for example,the maximal dynamic bending stress of the wire clamp exit is calculated under the condition of aeolian vibration.And then,the vibration load value of overhang composite insulator caused by conductor vibration is obtained on the basis of conductor hanging angle.At the same time,ANSYS software is applied to establish composite insulator solid model and Weibull distribution function is used to represent probability distribution of vibration frequency.Finally,fatigue life of composite insulator is calculated by considering Miner linear fatigue damage accumulation rule.The example results indicate that the proposed method is simple and reasonable,which provides reference for engineering application.
出处
《水电能源科学》
北大核心
2011年第1期155-157,177,共4页
Water Resources and Power
关键词
微风振动
复合绝缘子
疲劳寿命
导线
aeolian-vibration
composite insulator
fatigue life
conductor
