Power cables can be long-term, safe and reliable transmission of large-capacity electrical power supply known as the "power cable."
The power cable is a conductor that has high quality insulation and has a variety of protective layers.
Its main function, like overhead wires, transmits and distributes large-capacity electrical energy in power systems
The difference with the overhead line is that the power cable can be laid in a variety of environments, safe and covert, free from external climate change interference.
And can be less maintenance, durable (generally required more than 40 years).
But the structure of the power cable is more complex, more manufacturing processes, product prices than the overhead wire several times higher.
So generally used in applications that do not adapt to the use of overhead lines.
Such as urban transmission and distribution lines and industrial and mining enterprises to introduce Plant trunk power lines.
And across the river railway station, through the underground tunnel.
In fact, the power line is composed of overhead wires and power cables.
Overhead wires focus on the power transmission, transmission and distribution, and the power cables are used for power distribution.
1 It can withstand long and even high operating voltage, should have a very good electrical insulation performance.
So the power cable according to the use of voltage levels can be divided into: low pressure (1 kV and below) Medium pressure (6 - 35 kV), high pressure (66 - 330 kV), ultrahigh pressure (500 kV and above).
2 Cables can transfer a lot of current (several hundred or even several thousand years).
So the cross-sectional area will be used for hundreds or even thousands of square meters of conductive wire core.
At the same time require the use of insulation and other materials with excellent heat aging resistance, while the overall structure to maintain heat balance.
3 In order to adapt to a variety of cable laying methods and the use of the environment (underground, water, trench, tunnel, shaft), must use a variety of combinations of protective layer structure.
In fact, the power cables rely on the high-voltage insulation technology, high-current transmission technology and structural balance, sheath structure, etc. Represent the electrical industry in these aspects of the academic level.
Armored cable refers to the metal with armor protective layer of cable.
Cable with armored layer in addition to enhance the tensile strength, compressive strength and other mechanical protection to extend the service life, but also through the shield protection to improve cable anti-jamming performance.
Commonly used armor materials are steel, steel, aluminum, aluminum, etc., of which steel, steel armor layer with high permeability, a good magnetic shielding effect, can be used for low-frequency interference.
And can armor Installed cable buried and buried from the pipe and cheap in the actual use of more.
Different specifications of the different number of copper wire in a certain order and twisted strand twisted together.
It becomes a larger diameter conductor, the stranded large diameter stranded conductor than the same diameter of the single.
The copper wire is softer that the wire has a good bending performance, and the swing test is not easy to break.
And it is easier to meet the requirements for some soft wire (for example, medical grade wire).
From the electrical performance, the conductor is energized and the heat is consumed by the power dissipation due to the resistance.
As the temperature increases, the performance of the insulation layer and the protective layer material will be affected.
In order to operate the cable efficiently, the conductor cross section should be increased, but the large cross- It is not easy to bend, poor flexibility.
It is not conducive to the production of transport and installation laying from the mechanical properties and requires a soft, reliable, multi-stranded twisted together, you can solve the contradiction.
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