According to voltage level
According to the voltage level, it can be divided into medium and low voltage power cables (35 kV and below), high voltage cables (110 kV and above), ultra-high voltage cables (275 to 800 kV) and UHV cables (1000 kV and above). In addition, it can be divided into AC cables and DC cables according to the current system.
Classified by insulation material
1. Oil-impregnated paper-insulated power cables are insulated power cables with oil-impregnated paper. Its application history is the longest. It is safe and reliable, has a long service life and is low in 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, so that oil-impregnated paper insulated cables can continue to be widely used.
2. Plastic insulated power cable Insulation layer is extruded plastic power cable. Commonly used plastics are polyvinyl chloride, polyethylene, and cross-linked polyethylene. The plastic cable has simple structure, convenient manufacturing and processing, light weight, convenient laying and installation, and is not restricted by the laying drop. Therefore, it is widely used as medium and low voltage cables, and has a tendency to replace viscous-impregnated oil-paper cables. Its biggest disadvantage is the existence of tree-like 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 fully mixed and extruded on the conductive core, and then heated and vulcanized. It is soft and flexible, and is suitable for occasions with frequent movement and small bending radius.
The rubber materials commonly used for insulation include natural rubber-styrene butadiene rubber mixture, ethylene propylene rubber, butyl rubber and so on.
According to voltage level
1. Low-voltage cables: suitable for fixed laying on power transmission and distribution lines with AC 50Hz, rated voltage 3kv and below for power transmission.
2. Medium and low voltage cables: (generally refers to 35KV and below): PVC insulated cables, polyethylene insulated cables, cross-linked polyethylene insulated cables, etc.
3. High-voltage cables: (generally 110KV and above): polyethylene cables and cross-linked polyethylene insulated cables, etc.
4. Ultra-high voltage cable: (275～800KV).
5. UHV cables: (1000KV and above).
Skype: verdecable