Research on the wind-resistant structure of composite insulators for overhead contact system cantilever used based on fluid-structure interaction method

Composite insulators will appear deformation under the strong wind, it makes serious stress concentration at the roots of the sheds. The roots of insulator sheds are in the state of stress fatigue under the cyclic wind load, and finally lead to shed cracks. In allusion to the problems mentioned above, with the composite insulator for overhead contact system cantilever as the object, a model of 3D computer simulation was established. This paper discussed the relationship between deformation of the sheds and stress of the roots of insulator sheds, and explored the influence of wind speed, angle of wind approach and deformation of the sheds. The research shows that On the whole, the effect of the roots of the chamfering radius on the deformation is minimal, It is not important structural parameters of wind resistance. There is a linear relationship between wind speed, stress of the roots of sheds and deformation of the sheds. When the angle of wind approach is 17°, the deformation of the sheds is biggest under same wind velocity. When the angle of wind approach is 84°, the deformation of the sheds is smallest under same wind velocity. When the lower angle of the sheds is 7°, the deformation of the sheds is smallest under same wind velocity. According to the above research results, the wind-resistant composite insulator is designed.