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According to the insulation material 1, oil-impregnated paper-insulated power cable with oil-impregnated paper as the insulation of the power cable. Its application has the longest history. It is safe, reliable, long-lasting, and inexpensive. The main disadvantage is that the laying is limited by the drop. Since the development of the non-dripping impregnated paper insulation, the problem of drop restriction has been solved, and oil-impregnated paper insulated cables have continued to be widely used.
2. The plastic insulated power cable insulation is an extruded plastic power cable. Commonly used plastics are polyvinyl chloride, polyethylene, cross-linked polyethylene. The plastic cable has a simple structure, is convenient to manufacture and process, light in weight, easy to install and install, and is not limited by laying gaps. Therefore, it is widely used as a medium and low voltage cable and has a tendency to replace the adhesive impregnated oil paper cable. Its biggest drawback is the presence of dendritic breakdown, which limits its use at higher voltages.
3, rubber insulation power cable insulation layer with a variety of rubber compounding agent, after fully mixed and extruded on the conductive core, after heating and vulcanization. It is soft, flexible and suitable for applications where frequent movements and small bending radii are required.
Commonly used as insulation material of natural rubber - styrene-butadiene rubber mixture, ethylene propylene rubber, butyl rubber and so on.
Divided by voltage level 1, low voltage cable: suitable for fixed laying in the AC 50Hz, rated voltage 3kv and below the transmission and distribution lines for transmission of electrical energy.
2. Medium and low voltage cable: (generally refers to 35KV and below): PVC insulated cable, polyethylene insulated cable, cross-linked polyethylene insulated cable, etc.
3, high-voltage cables: (usually 110KV and above): polyethylene cables and cross-linked polyethylene insulated cables.
4, EHV cable: (275 ~ 800 kV).
5, UHV cable: (1000 kV and above).
Power cable by voltage rating
Divided by voltage class <br><br> According to voltage class, 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 special High-voltage cables (1000 kV and above). In addition, it can also be divided into AC and DC cables by current.