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Technical characteristics of composite insulators in substation equipment
Sep 04, 2018

First, let us introduce insulators, commonly known as porcelain bottles, which are insulators used to support wires. It can ensure that the wire and the cross arm and the tower are sufficiently insulated. The composite insulator has mature manufacturing technology and simple process, and the design of the core rod strength, the strength of the metal fitting and the crimping strength has been reasonable. When operating under long-term high-humidity atmospheric conditions, if the hydrophobicity of the composite insulator is partially lost or completely lost, the flashover of the arc between the sheds is likely to cause a flashover accident, which seriously threatens the safe and reliable operation of the grid.

At present, for the composite insulators for transmission lines, the shape of the umbrella skirt has been greatly improved compared with the past. Basically, the size of the umbrella, the three umbrella structure, the five umbrella combination and the two large and two umbrella types, the umbrella diameter reaches 200 mm. The pitch of the umbrella reaches 140 mm; for all kinds of hollow composite insulators, it is necessary to prevent the dense structure of the umbrella skirt from being easily chained in heavy rain or heavy rain, causing rain and flash. Therefore, the optimal design of the shape of the composite insulator umbrella skirt is still a key point of system research. Interface and seal structure design interface and seal structure design is the key to the design of composite hollow insulator. After all, the composite insulator has a short running time and a small number. Many of its key technologies have not been tested in the operating environment for a long time, especially the end accessories and glass. The interface between the fiber-reinforced epoxy tube and the umbrella cover, if not handled properly, will affect the safe operation of the composite hollow insulator.

Insulators can be divided into different types and types according to different classification standards and forms. They exhibit different properties and values in actual use and development. According to the structure, they can be divided into pin insulators, rod insulators and suspension insulators. It is capable of withstanding the load in the vertical direction of the wire and the pulling force in the horizontal direction during operation. It is also exposed to sun, rain, climate change and chemical attack. Therefore, the insulator must have good electrical properties and sufficient mechanical strength. The quality of the insulator is very important for the safe operation of the line. Classification insulators for link insulators can be classified according to their structural form, function and materials used. (2) According to different functions, it can be divided into ordinary insulators and anti-fouling insulators. According to the materials used, it can be divided into porcelain insulators, glass insulators and composite insulators (silicone synthetic) insulators. The composite insulator composite insulator is an abbreviation for a rod-shaped suspension silicone rubber insulator.

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