Fatigue Analysis of Composite Insulator under Aeolian Vibration

Conductor, which is in the condition of aeolian vibration for long period, will transfer vibration to the composite insulator, so composite insulator is frequently subjected to vibrational fatigue failure. This paper takes a 500kV transmission line for example, calculates the max dynamic bending stress of wire clamp exit, and gets the vibrational load values, which are caused from conductor aeolian vibration, according to the conductor hanging angle. At the same time, this article builds composite insulator solid model basing on the ANSYS software, represents probability distribution of vibration frequency using Weibull distribution, and analyses fatigue coefficient of use up of composite insulator within every frequency segment, according to Miner linear fatigue damage accumulation rule. Finally we get the fatigue life of composite insulator.