This section provides an overview for cv cables as well as their applications and principles. Also, please take a look at the list of 10 cv cable manufacturers and their company rankings.
Table of Contents
A CV cable is a type of cable used in industrial power transmission. Its official name is "cross-linked polyethylene insulated vinyl sheath cable."
As the name suggests, this cable uses cross-linked polyethylene as the insulation material and vinyl as the sheath layer.
CV cables are mainly used for power transmission. When walking in urban areas, you may see utility poles. If you observe the poles, you will see cables suspended from the poles as supports. They are CV cables.
CV cables have core wire covered with a vinyl sheath or polyethylene, making them resistant to wind, rain, and sunlight. They are often used outdoors where they are directly exposed to rainwater. In ordinary houses, power is distributed using cables called vinyl-sheathed cables. Therefore, CV cables are never seen inside a house.
CV cables above high voltage mainly consist of a core wire, a semiconducting layer, a cross-linked polyethylene layer, a copper tape layer, a vinyl sheath layer, and other layers. The core wire is the layer that serves as the electrical pathway. It is mainly made of copper or aluminum. In most cases, twisted wires made of multiple thin copper wires are used.
The core wire is surrounded by a semi-conductive layer. The semi-conductive layer is made of carbon-rich polymers and other materials. The semi-conductive layer fills the gap between the cross-linked polyethylene layer and the core wire, thereby preventing deterioration of the cross-linked polyethylene layer due to voltage. The crosslinked polyethylene layer is an insulating layer for the core wire. There is also a semi-conductive layer outside the cross-linked polyethylene layer that fills the gap between it and the copper tape layer.
The copper tape layer is a thin copper film that is provided to keep electromagnetic waves from the core wire from leaking outward. In the event of insulation degradation, the core wire is grounded through the copper tape layer, making it an important layer from the standpoint of preventing electrical accidents. The copper tape layer is surrounded by a sheath for corrosion protection. The sheath is made of vinyl and is often black to improve weather resistance.
In the case of multi-core cables, inclusions are inserted between the sheath and the copper tape layer to fill in the gaps. Inclusions are mainly made of insulating fibers such as jute. Three-core cables are mainly used for multi-core cables. This is because power transmission systems generally use many 3-phases.
In the case of 3-core cables, cables with triplex construction are often used. These are made of three strands of the above single-core cables and have excellent heat dissipation due to the absence of inclusions, etc. They are also called CVT cables.
The structure of CV cables differs in part depending on the voltage used.
When special high voltage is used, the cross-linked polyethylene layer is thicker to increase the insulation distance. The copper tape layer described above should be constructed like a flexible tube or copper wire, not like a tape.
As the voltage increases, the cross-linked polyethylene layer becomes thicker.
When the voltage is 3.3kV, instead of using a semiconducting layer, the gap is filled with an insulating material such as PET. In the case of 3.3kV cables, only one copper tape layer is used for grounding, and compared to 6.6kV cables, the end treatment material is smaller and the end treatment is easier.
In most cases, a semi-conductive layer or a copper tape layer is not used for low-voltage cables. This is because the voltage is low and the generation of electromagnetic waves is low. The cross-linked polyethylene layer is also thinner than that of high-voltage cables.
*Including some distributors, etc.
Sort by Features
Sort by Area
Number of Employees
Newly Established Company
Company with a History
This is the version of our website addressed to speakers of English in Canada. If you are a resident of another country, please select the appropriate version of Metoree for your country in the drop-down menu.