The main classification of power cables

The power cables of the cable factory are mainly used for the transmission and distribution of electrical energy. Power cables are often used for the outgoing lines of urban underground power grids and power stations, as well as the internal power supply of industrial and mining enterprises, or the national underwater transmission lines. In a line, the proportion of cables is also gradually increasing. Power cable is a kind of cable product used to transmit and distribute high-power electric energy in the main line of the power system, including various voltage levels of 1~500kv and above, and various insulated power cables. The power cable has a history of hundreds of years.

It was Edison of the United States who wrapped jute in Tongfeng County in 1879 and put it into iron pipes, and then filled it with a cable made of asphalt mixture, and laid the cable in New York to create an underground bookstore. In the second year, the British Callender created pitch-impregnated paper insulated power cables. According to the voltage level, it can be divided into low and medium power cables, high voltage cables, ultra high voltage cables and ultra high voltage cables. In addition, it can be divided into communication cables and DC cables according to current.

If it is divided according to the nine raw materials, it can be divided into oil-impregnated paper. The insulated power cable is mainly insulated by oil-impregnated paper. The history of the use of power cables in the cable factory is very long, and it is safe and reliable. Long, the price is very low, one defect is that the skin color is restricted by the drop. Since the development of non-drip impregnated paper insulation, the problem of drop constraint has also been dealt with. The oil-impregnated paper insulated cable has continued to be widely used.

Plastic insulated power cable, its insulation layer is extruded plastic power cable. Commonly used plastics include poly-recording and ethylene-poly cross-linking. According to some plastic cables, the structure is very simple, the production and processing are also very convenient, and the weight is very light. , Laying and installation are more convenient, and will not be restricted by the laying drop. So it is widely used as a medium and low voltage cable, and it has also replaced the trend of sticky paper cables.

The defect in the process is the phenomenon of branching breakdown, which also restricts its use in higher electricity. The insulating layer of the rubber insulated power cable is made of rubber plus various compounding agents. After sufficient mixing, it is extruded on the conductive wire core by heating and vulcanizing to make it very soft and elastic. Therefore, it is suitable for mobile frequency and some occasions with small bending radius.