In this paper

a structure of aero dynamical antipollution insulator is designed for overcoming the weakness of bell-shaped insulator having more serious contamination on the lower shed surface in windy and dusty environment. Benefiting from aero dynamical structure

the airflow velocity is maintained a high value around sheds

and it is not easy to deposit dust on the shed surface. The alternating sheds structure has a small rib which is set on the edge of the upper big shed

and the inclination angle of the lower small shed is less than the upper one’s.The creepage distance of aero dynamical insulator is approximately equal to the bell-shaped one with same mechanical load. In addition

the airflow field near insulator is simulated by CFD software. The area proportion of low airflow velocity Plais defined by the data of velocity contour in three sections in 3D space. Comparing the values of Plain the simulation of aero dynamical insulator

bell-shaped insulator and double-shed insulator

it is indicated that the scope of low airflow velocity zone of the new structure is obviously smaller than that of the traditional structure

and the low airflow velocity zone is located mostly in leeward side of porcelain column that is helpful to remove the attached contamination when the wind direction changed. Accordingly

it is certified the antipollution advantage of the new type insulator.