NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Locator Suppliers
Power cable classification Common power cable classification and use place Power cable classification Power cable refers to the cable used to transmit and distribute electrical energy. It is often used in urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines crossing rivers and seas. The basic structure of a power cable consists of four parts: the core (conductor), the insulating layer, the shielding layer and the protective layer.
Classification of power cables: According to the voltage level, it can be divided into: medium and low voltage power cables (35 kV and below), high-voltage cables (above 110 kV), ultra-high voltage cables (275-800 kV) and ultra-high voltage cables (1000 kV) kV and above). According to the insulation material: According to the insulation material, it can be divided into: oil-impregnated paper insulated power cable, plastic insulated power cable, rubber insulated power cable. Oil-impregnated paper insulated power cable is a power cable with oil-impregnated paper as insulation.
Its application history is the longest. It is safe and reliable, has a long service life and is inexpensive. The main disadvantage is that the laying is limited by the drop.
Since the development of non-drip paper-impregnated insulation, the problem of drop limit has been solved, allowing oil-impregnated paper-insulated cables to continue to be widely used. Plastic insulated power cables are power cables in which the insulation layer is extruded plastic. Commonly used plastics are polyvinyl chloride, polyethylene, and cross-linked polyethylene.
The plastic cable has the advantages of simple structure, convenient manufacturing and processing, light weight, convenient laying and installation, and is not limited by the laying drop. Therefore, it is widely used as medium and low voltage cables, and has a tendency to replace sticky impregnated oil-paper cables. Its biggest disadvantage is the presence of dendritic breakdown, which limits its use at higher voltages.
The insulating layer of rubber insulated power cable is made of rubber plus various compounding agents. It is soft and elastic, suitable for frequent movement and small bending radius. According to the current system, it is divided into: AC cable and DC cable common power cable classification and use place power cable classification Shenzhen Noyafa Electronic Technology Co., Ltd.
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