The armed cable is an additional layer of metal armor outside the traditional cable, which has better mechanical resistance and better corrosion resistance. There are many reinforced cable applications. This article addresses this subject in detail.
It is suitable for certain special occasions, For example in erosion areas by acid rain, mining areas and other difficult environments.
The underground installation is also a current use scenario. Compared to ordinary cables, Metal armor can protect the internal structure of the cable, thus improving safety and reliability.
It can effectively prevent rodents from damaging the cable and improving cable antiparasing by adding a shielding layer, which widens the field of use.
Structure of armed cables
The structure of an armed cable consists mainly of several parts : The soul of the thread, l’isolation, shielding, the protective layer and Metal armor.
The driver is the most central part and is the main means of transmission. It is generally a copper or aluminum driver.
Copper drivers are more conductive than aluminum drivers and have advantages such as better ductility.
Aluminum drivers are generally used as aluminum alloy drivers with the addition of other metals and are cheaper.
The insulation ensures that the current transmitted inside the driver does not circulate outwards, which prevents power leaks and short circuits and guarantees the safety of people or objects outside.
Insulating materials are mainly XLPE and PVC, XLPE having good heat resistance and a low radius of curvature, and PVC having stable physical properties.
Armor is the most external layer of the structure and the fluently used armor materials are the steel belt, Steel wire, aluminum belt, aluminum tube, etc.
The steel belt, The steel thread armor layer have high permeability, A good magnetic armor effect, can be used for low -frequency interference, But can also make the armor of the cable buried directly and without laying pipes, and affordable, In the real use more.
Advantages of armored power cables
- The outer layer of the armed cable has a hard structure, which can effectively protect the driver from external damage. It guarantees high safety and reliability of energy transmission.
- The structural design of external metal armor considerably improves its mechanical resistance. Reduces the risk of damage caused by extrusion and collision.
- Armor has strong corrosion resistance, which allows it to be used normally in an unfavorable environment.
- The armor layer can be set to the ground, which reduces the grounding resistance, increase the defect current and protect the electrical characteristics more reliably.
- The insulation material can be XLPE, that is to say the cable XLPE armed food.
- There are more scenarios, Whether it's buried cables, air cables or other factors likely to damage the cable, armor can ensure cable protection.
The overall advantages of the above aspects also allow the armed cable to avoid damage caused by cable loss in the energy transmission process, and considerably prolong the lifespan.
Types of armed cables
Depending on the materials commonly used for armor, Armed cables can be divided into armed steel strip cables, armed steel wire cables and aluminum alloy thread.
Armed cable in steel ribbon
Armor on steel strawberries generally includes two steel strips rolled up in a spiral around the cable, The exterior steel strawberries being roughly above the inner steel strawberry, and the space between interior steel strips must be covered by the external steel strawberries.
Steel's armed cables
The cables armed with steel wires are made up of high -resistance steel wires rolled up in a spiral around the outside of the cable.
Two important parameters of steel thread armor are the number of threads and the step of the torus, which ensure the sealing of the armor.
Steel wire armor can prevent mechanical damage ; It is generally used for buried lines of the electrical network.
Armored aluminum alloy cable
When the cable is unipolar, The current which passes through the unipolar cable creates a magnetic field which causes the warming of the wire.
To solve this problem, Steel wire can be replaced by non -magnetic aluminum wire. Aluminum wire can therefore be used when choosing the armor for unipolar cables.
What are the applications of armed cables ?
The structural characteristics of the armed cable guarantee its high mechanical resistance, Armor can provide solid support and effectively protect the driver from external damage.
During the underground installation, The cable can withstand the pressure above the floor and the ground below, abrasion of rock or damage caused by rodents due to acid rains, shocks and crushing, which gives it a high degree of prevention, security, stability and reliability.
In the underground pose, Sand should be placed, padding bricks and ensuring that the depth of the buried soil is not lower than 800 mm.
Remember what we said above about armor : There is steel thread armor and steel belt armor. Cable armor is used not only to provide mechanical cable protection, but also to improve cable resistance to deformation, compression resistance and traction resistance.
If it is a high fall or tension for the use of important scenes, The armed cable with steel belt is a good choice, The steel belt ensuring that the cable will not deform when it is subjected to different directions of the force.
The armed steel cables are suitable for scenarios where a vertical installation is necessary, and are easy to install without it being necessary to add sheaths.
High voltage cables are commonly used for transmission and transformation between electrical networks, with tensions ranging from 36 kV to 230 kV.
There are large -scale installations in various regions, especially in the high mountains, deserts, storms, frequent activity of lightning and other hostile areas from the point of view of the environment.
The armored high voltage cable is then a good choice to avoid the failures of the cable components caused by lightning.
ZMS Cable is a first -rate supplier of aluminum and copper wires and armed cables that are provided in accordance with European and international standards. If you need help, do not hesitate to contact us.