Suspension insulators are usually made of insulating parts (such as porcelain, glass) and metal accessories (such as steel feet, iron caps, flanges, etc.) glued with glue or mechanically clamped. Insulators are widely used in power systems and generally belong to external insulation and can work under atmospheric conditions. Overhead transmission lines, bus bars of power plants and substations, and external live conductors of various electrical equipment must be supported by insulators and insulated from the earth or grounded objects or other conductors with potential differences.
ordinary
The umbrella insulator is a kind of suspension insulator with a long history of use. They are characterized by simple structure, low cost, suitable for use in clean areas, and are usually used in AC transmission lines.
Disc type
Disc suspension insulators are commonly used and important line insulators. The insulator is glued by iron cap, insulating porcelain piece and glue. The surface of the steel feet and iron caps in contact with the glue is thinly coated with a buffer layer, usually bitumen, and there is an elastic liner between the ceramic parts on the top of the steel feet. The surface of the porcelain piece is usually white glaze, and the surface of the iron cap and steel feet are all hot-dip galvanized. There should be a proper gap between the edge of the lower mouth of the hat and the insulating part to avoid stress damage to the insulating part when the material expands.
Bell type
The umbrella-shaped insulator has a long under the umbrella edge, the product can reach a large creepage distance, the cavity under the umbrella is not easy to be damp, has a higher pollution withstand voltage, and is more suitable for coastal, foggy, humid and saline-alkali areas Used for AC and DC transmission lines.
Double and triple umbrella type
Because the products of these two shapes are smooth and non-ribbed under the umbrella and formed into an open shape, they have good wind and rain self-cleaning performance, lower natural dirt accumulation rate and larger creepage distance. The product has a good level of pollution and pressure resistance, and can give full play to the advantages of the umbrella structure when used in a dusty environment. This umbrella insulator is called "aerodynamic type", they are suitable for various working conditions, especially in high pollution, high altitude and dry desert areas of AC and DC transmission lines.
Straw hat type
The umbrella tray of this product is very large in diameter, smooth and without edges under the umbrella, streamlined structure, good self-cleaning performance, and less dust accumulation. The characteristic of use is to insert it into the upper and middle parts of the suspension string of AC and DC line insulators. The extra-large diameter structure can suppress the flashover of line pollution caused by ice skating and bird droppings.