The basic structure of

The basic structure of the power cable from the four parts of the line core (conductor), the insulating layer, shielding, and protective layer.

(1) line core

The wire core is conductive part of the power cable used to transport electricity, is the main part of the power cable.

(2) insulation

The insulating layer is between the line core and the earth, and the cores of the different phases are electrically isolated from each other to ensure that the power transmission is an integral part of the structure of power cables.

(3) shield

15KV and above the power cables are generally the conductor shield and insulation shield.

(4) protective layer

The role of the protective layer to protect the power cables from external impurities and moisture intrusion, and to prevent external damage the power cable.

Category:

According to the voltage levels:

Voltage level can be divided into medium and low voltage power cable (35 kV and below), the high-voltage cables (110 kV and above), the extra high voltage cables (275 to 800 kV) and UHV cable (1000 kV and above). There is also the current system into the AC cable and DC cable.

Insulating materials:

An oil impregnated paper insulated power cables for oil impregnated paper insulated power cables. Its application to the longest history. It is safe, reliable, long life, low prices. The main drawback is the laying gap limit. To address the gap constraints, the oil impregnated paper insulated cables to continue to widely used since developed a trickle impregnated paper insulation.

2, plastic insulated power cable power cable insulation extruded plastic. Commonly used plastic polyvinyl chloride, polyethylene, crosslinked polyethylene. Plastic cable structure is simple, easy manufacturing and processing, light weight, easy installation, laying, without laying gap limit. Widely used for low voltage cable, and the trend to replace the viscous impregnation oilpaper cable. Its biggest drawback is the existence of branches of the breakdown phenomenon, which limits its use in higher voltage.

Rubber insulated power cable insulation for the rubber with various ingredients, after full mixing extruded conductive wire heart made after heat curing. It is soft, flexible, suitable for mobile frequently, laying a small bending radius of the occasion.

Commonly used for insulation rubber natural rubber - styrene butadiene rubber mixture, ethylene propylene rubber, butyl rubber, and so on.