Technical characteristics of power cables

1) Capable of enduring high or even extremely high working voltages for a long time, and should have excellent electrical insulation performance

2) It can transmit a large amount of current (900 to even thousands of amperes), so conductive wire cores with a hidden cross-sectional area of several hundred to even thousands of square millimeters will be used.

3) Power cables adopt various combinations of protective layer structures, which can adapt to various laying methods and usage environments (underground, underwater trenches, tunnels, vertical shafts).

In fact, the high-voltage insulation technology, large voltage transmission technology, structural balance, and protective layer structure that power cables rely on all represent the academic level of these aspects in the field of electrical engineering.

Classification of power cables

Power cables are all used in the power system, so they are generally no longer classified into small categories, but are classified into series based on different insulation materials or structures.

According to cable core materials, it is divided into two categories: copper core and aluminum core. According to the insulation medium used, it is divided into two categories: oil-immersed paper insulation and plastic insulation.

1) Polychloroethylene insulated power cable

2) Crosslinked polyethylene insulated power cable

3) Viscous oil impregnated insulated power cables

4) Oil filled cable

5) Rubber insulated power cable

6) Overhead insulated cable

The difference between power cables and control cables

1. Different functions: Power cables are used in the backbone of the power system to transmit and distribute large functional electrical energy; Control cables are used for the control wiring of electrical equipment and appliances.

2. Different categories: Power cables belong to the second category among the five major categories of cables; Control cables belong to the third category of the five major categories of cables (cables for electrical equipment).

3. Different standards: The standard for power cables is GB12706; The standard for control cables is 930. 

4. The identification of insulated core wires is different: the insulation of power cables generally adopts color phase separation; The color of the insulation core of the control cable is usually printed with a single color and a numerical number. Mainly used for power transmission, power cables.