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How does a composite insulator ensure its creepage resistance?

Apr 12, 2019

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.

The utility model relates to a composite insulator with better anti-creepage performance, including an insulating mandrel, a metal supporting head fixed on the top of an insulating mandrel, a metal fixing foot fixed on the bottom of an insulating mandrel, and an anti-creepage insulating sheath fixed on the outer wall of an insulating mandrel; The anticreepage insulation sheath is symmetrically provided with two bowl-shaped umbrella skirts with a volumetric cavity, and the opening of the volumetric cavity of the bowl-shaped umbrella skirt is in the opposite direction, that is, the opening of the volumetric cavity of one bowl-shaped umbrella skirt is located on one side far away from the other bowl-shaped umbrella skirt. In the above scheme, the bowl-shaped umbrella skirt includes a annular base area protruding from the outer wall of the anti-creeping insulation sheath and a protective area extending from the outer end of the annular base area to the direction away from the other bowl-shaped umbrella skirt. The outer surface of the protective zone is conical. The protective zone and annular base zone are arranged around the outer surface of the insulating sheath to form a capacitance cavity, and the depth of the capacitance cavity is greater than or equal to 5 cm. A plurality of annular umbrellas are arranged between the two bowl-shaped umbrellas, which are formed by protruding from the outer wall of the anti-creeping insulation sheath. The number of annular umbrella skirts is three. The diameter of one annular umbrella skirt in the middle is larger than the diameter of the other two annular umbrella skirts and smaller than the maximum diameter of the bowl-shaped umbrella skirt protection area.

The utility model has the following effects: through the unique structural design of the umbrella skirt, the dirt can be collected by the reception-cavity of a bowl-shaped umbrella skirt at the upper end and washed away in the rainstorm, thus effectively avoiding the influence of a small amount of dirt on the umbrella skirt body and affecting the creepage performance; In addition, it can use the outer wall of another bowl-shaped umbrella skirt protection area to quickly drain the rain water falling on it, and effectively ensure that the inner wall of this protection area is in a dry state without water, and effectively ensure the anti-creepage performance.