Composite insulators will appear deformation under the strong wind

and make 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 discusses 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 the effect of the roots of the chamfering radius on the deformation is minimal. It is unimportant structural parameters of wind resistance. When the angle of wind approach is 17°

the deformation of the sheds is biggest under same wind velocity

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 edge deformation of sheds decreases steadily from 5 mm to 0.85 mm

and the increase of the inclination angle of sheds effectively restrains the increase of the edge deformation of sheds

which has an extremely important impact on the wind resistance of insulators. Based on the above research results

the sheds structure of cantilever composite insulators is optimized to improve the wind resistance of insulators.