Overstressed electric field intensity caused by water film and water droplets on the surface of wet insulator and landing droplets leads to discharge which will affect the insulator flashover characteristics. Consequently

we analyzed the effect of water droplet’s parameters on distortion degree of electric field on the surface of water droplets under different electric field rotation angle

and researched the influence of landing water droplets on the space electric field and insulator flashover characteristics. The results show that characteristics of field distortion on the surface of water droplets are related to direction of the original field strength. And changing direction of the space electric field of insulator can be considered to optimize the electric field distribution for making the surface of the water droplets in a smaller electric field environment. Furthermore

space field intensity is strengthened and area of high field intensity increases in the process of contaminated water landing. And development of electrical arc along the clearance and conductive water may cause high voltage side to be broken down directly. In addition

the maximum field intensity around water droplets increases with the increasing of air velocity

but the deflection angle of water droplet will affect the flashover path. So only an appropriate low speed air flow will increase the probability of insulator flashover.