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Power Cable|What is a Power Cable?

Aug 14, 2023 | Technical Literature | 0 comments

Power cables are cables used to transmit and distribute electrical energy. In power lines, the proportion of cables is gradually increasing. Power cables are cable products used to transmit and distribute high-power electric energy on the main line of the power system, including various voltage levels of 1-500KV and above and various insulated power cables.

Power cables

Power cable use and main classification

Power cables are often used in urban underground power grids, power station outlets, internal power supply in industrial and mining enterprises, and cross-river and offshore underwater transmission lines.
According to the voltage level: according to the voltage level, it can be divided into medium and low voltage power cables (35kV and below), high voltage cables (above 110kV), extra high voltage cables (275~800kV) and extra high voltage cables (1000 kV and above). In addition, according to the current system, it can also be divided into AC cables and DC cables. Divided by insulating material: 1. Oil-impregnated paper insulated power cable is a power cable insulated with oil-impregnated paper. It has the longest application history. Safe and reliable, long service life, cheap price. The main disadvantage is that the laying is limited by the drop. Since the development of non-drip impregnated paper insulation, the problem of drop limitation has been solved, enabling oil-impregnated paper insulated cables to continue to be widely used. 2. Plastic insulated power cables The insulating layer is extruded plastic power cables. Commonly used plastics are polyvinyl chloride, polyethylene, cross-linked polyethylene, etc. The plastic cable has simple structure, convenient manufacturing and processing, light weight, convenient laying and installation, and is not limited by laying drop. Therefore, it is widely used as medium and low voltage cables, and tends to replace viscous impregnated oil-paper cables. Its biggest disadvantage is the existence of dendrite breakdown, which limits its use at higher voltages. 3. Rubber insulated power cable The insulating layer is made of rubber plus various compounding agents, which are extruded on the conductive core after full mixing, heating and vulcanization. The texture is soft and elastic, suitable for occasions with frequent movement and small bending radius. Commonly used insulating rubber materials include natural rubber-styrene-butadiene rubber mixture, ethylene-propylene rubber, butyl rubber, etc. Classified by voltage level: 1. Low-voltage cables: suitable for fixed laying on 50Hz AC transmission and distribution lines, rated voltage 3kv and below for power transmission. 2. Medium and low voltage cables: (generally refer to 35KV and below): PVC insulated cables, polyethylene insulated cables, XLPE insulated cables, etc. 3. High voltage cable: (generally refers to 110KV and above): polyethylene cable, XLPE insulated cable 4. Insulation layer of insulating cable: UHV cable: (275-800KV). 5. UHV cables: (1000KV and above).

Basic structure of power cables

The basic structure of a power cable consists of four parts: a core (conductor), an insulating layer, a shielding layer and a protective layer. 1. Wire core, the wire core is the conductive part of the power cable, which is used to transmit electric energy and is the main part of the power cable. 2. Insulation layer. The function of the insulating layer is to electrically isolate the wire core from the ground and the wire cores of different phases to ensure the transmission of electric energy. It is an indispensable part of the power cable structure. 3. Shielding layer, 15KV and above power cables generally have a conductor shielding layer and an insulating shielding layer. 4. Protective layer, the function of the protective layer is to protect the power cable from the intrusion of external impurities and moisture, and prevent the external force from directly damaging the power cable.

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