What are the basic knowledge points of wire and cable?

The vast majority of wire and cable products have the exact same cross-section (ignoring manufacturing errors) and are in the form of long strips, which is due to the fact that they are used in a system or device as part of a line or coil. Therefore, to study and analyze the structural composition of wire and cable products, it is only necessary to observe and analyze them from their cross-section. The structural components of wire and cable products, in general, can be divided into wire, insulation, shielding and sheathing of the four main structural components, as well as filler components and bearing elements, etc.. According to the use of the product requirements and application occasions, some products have a simpler structure.

I. What is the basic knowledge of wire and cable? 1, bare wire and bare conductor products of this category of products are mainly characterized by: pure conductor metal, no insulation and sheath layer, such as steel-core aluminum stranded wire, copper-aluminum busbar, power locomotive line, etc.; processing technology is mainly pressure processing, such as smelting, calendering, pulling, stranded/tightened stranded, etc.; the product is mainly used in the outskirts of the city, the countryside, the user's main line, switchgear and so on. 2, power cables. The main features of these products are: extruded outside the conductor (winding) package insulation, such as overhead insulated cables, or a few core stranded (corresponding to the phase line of the power system, the zero line and ground), such as more than two-core overhead insulated cables, or increase the sheath layer, such as plastic / rubber-coated wires and cables. The main process technologies are pulling, stranding, insulation extrusion (winding and wrapping), cable formation, armoring, sheath extrusion, etc., and there are some differences in the combination of different processes for various products. Products are mainly used in the generation, distribution, transmission, transformation, power supply lines in the transmission of electricity, through the current (tens of amps to thousands of amps), high voltage (220V to 500kV and above).3, electrical equipment wire and cable the main features of this category of products: a wide range of varieties and specifications, a wide range of applications, the use of the voltage in the 1kV and the following are more, in the face of the special occasions continue to derive new products, such as fire-resistant Cable, flame retardant cables, low smoke halogen-free / low smoke low halogen cable, termite-proof, anti-rat cable, oil / cold / temperature / wear-resistant cables, medical / agricultural / mining cables, thin-walled wires, etc. 4, communication cables and fiber optic with the rapid development of the communications industry, from the past to the development of simple telephone and telegraph cable to a few thousand pairs of words, coaxial cables, fiber optic cables, data cables, and even a combination of communication cables. The structure of this type of product size is usually small and uniform, manufacturing precision requirements. 5, electromagnetic wire (winding wire) is mainly used for a variety of motors, instruments, etc. 6. Derivative/new products of wire and cable wire and cable derivatives/new products mainly due to the application of occasions, application requirements are different and the convenience of the equipment and equipment to reduce the cost of the requirements, and the use of new materials, special materials, or to change the structure of the product, or to improve the process requirements, or will be different varieties of products. Process requirements, or a combination of different varieties of products.

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