Based on wind tunnel test system

the impact of the sand dust in high speed airflow on the insulatorflashover characteristics is explored and insulator flashover voltage is measured under the condition of sand dust inhigh speed airflow. The flashover voltage of composite insulators is compared with sand dust and dust free

and thechanging trend of flashover voltage of composite insulators under sand dust environment is revealed. The researchshows that the flashover voltage of insulator increases first and then decreases with the increase of the wind speed

and the voltage is smaller under sand environment than that of sand-free environment. Under the same wind speed

when the sand particle diameter is 100 μm

the flashover voltage of insulator is higher under less sand flux than thatof high flux. With the increase of airflow speed

the degree of flashover voltage affected by the distorted electric fieldwill gradually be lower than that of the flow field

and make the difference between the sand and dust flows at arelatively high airflow speed smaller.