Power cable is a cable used to transmit and distribute electricity. power cable is often used in urban underground power network, power station extraction line, internal power supply of industrial and mining industry and Guo underwater transmission line. In power lines, the proportion of cables is gradually increasing. Power cable is used in the backbone of power system to transmit and distribute high-power electric power cable products, including 1 - 500 kv and above various voltage levels, various insulation power cables.

Voltage are rated

According to voltage level can be divided into neutral, low-voltage power cable ( 35kv and below ), high voltage cable ( 110 kv ), EHV cable ( 275 ~ 800 kv ) and UHV cable ( 1000 kv and above ). In addition, the current system can be divided into AC cable and DC cable.

By insulation material

1. the power cable with oil impregnated paper insulation power cable is insulated by oil impregnated paper. Its application history is longest. It is safe and reliable, long life and low price. The main disadvantage is the laying of fall limit. Since the development of not impregnated paper insulation, the problem of gap limit, the oil impregnated paper insulation cable can continue to be widely used.

2. the insulation layer of plastic insulated power cable is the power cable with extruded plastic. Commonly used plastics include polyvinyl chloride, polyethylene, crosslinked polyethylene. The plastic cable is simple structure, convenient manufacturing and processing, light weight, convenient installation, without laying fall limit. Therefore, the zuozhong low voltage cable is widely used and the trend of replacing the viscous impregnated paper cable. Its biggest disadvantage is the existence of Dendronization breakdown, which limits its use in higher voltage.

3. the insulation layer of rubber insulation power cable is rubber and various ingredient, after full mixing, the insulation layer is in the core, and is made by heating. It is soft and elastic, suitable for mobile frequent and small bending radius.

The compound used as insulation has natural rubber - mixture, ethylene propylene rubber, butyl, etc.

Voltage are rated

1. low-voltage cable: suitable for fixed laying for transmission power transmission and distribution lines in AC 50 Hz, rated voltage 3 kv and less.

2. medium voltage cable: ( generally referred to 35kv and below ): PVC insulated cable, polyethylene insulated cable, XLPE insulated cable, etc.

3. high voltage cable: ( generally 110 kv and above ): polyethylene cable and XLPE insulated cable, etc.

4. extra-high voltage cable: ( 275 ~ 800 kv ).

5 cable: ( 1000 kv and more ).