How does a composite insulator ensure its creepage resistance?

Composite insulators are composed of mandrel, connecting fittings at both ends of mandrel, insulating sheath and umbrella skirt covered by mandrel. Emerging composite insulators are widely used in power systems due to their advantages of light weight, high strength, good electrical performance and easy maintenance. Existing composite insulators umbrella skirt type are belong to the upper and lower structure, existing umbrella skirt skirt body in line with a single straight segment, has certain thickness of the section of rotors, the top of the umbrella skirt body are connected to the sheath and extends outward with less than 30 degrees slope Angle, the insulation of the umbrella skirt body outer surface composed, on the surface and under surface fluctuation on the surface of the slope Angle is 18 degrees commonly or 10 degrees. This traditional umbrella skirt body, because the Angle of inclination is small, the rain will wet all umbrella skirt body, including the part below the umbrella skirt; In addition, dirt such as bird droppings will flow with rain to the various umbrella skirts on the insulation sheath; As a result, its overall anti-creepage performance is greatly reduced, which is easy to cause accidents.