Introduction
It’s the type of conductor most used worldwide and it is composed of a steel core and one or more hard drawn aluminium layers.
The steel core, that is the mechanical support, can be composed of galvanized steel wires or Aluminium Clad Steel wires (ACS).
The wires of the conductive layers could be made of hard drawn aluminium or of thermal aluminium alloy and they have a rounded section.
Engineering
Even if the ACSR/ACSR-AW conductors are listed in the international norms, as EN 50182, De Angeli Prodotti can realize every customized composition.
Specifically for the conductive layers in aluminium or aluminium alloy, De Angeli Prodotti proposes alternative shapes as trapezoidal wires, “Z” wires, etc.
Advantages
The use of trapezoidal or “Z” wires allows a substantial raise of the filling-factor. Consequently, considering the same external diameter, the conductive section and the capability of energy transport increase remarkably. In addition, thanks to extremely flat surface, the drag coefficient (CX) decreases.
The use of ACS (Aluminium Clad Steel) wires as the core guarantees an ultimate resistance to the corrosion, especially in saline environments.
In the case of zinc coated wires, the use of grease provides an adequate protection.
Case Study
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A new transmission line of 380 kV built to bring more energy in the Stavanger area (Norway)
The project consists in a new transmission line of 380 kV built to bring more energy in the Stavanger area due to the increase of the consumes linked to the increase of the population in the city. The customer invited De Angeli Prodotti to participate to the tender because they needed special, resilient and high quality conductor to cross the 2,7 km long fjord. A conductor of Aluminum Alloy and Steel was designed and produced in our plant in Italy, one of the biggest ACSR ever produced in the factory with a diameter of 56,7 mm and a weight of 6,40 kg/m. To reduce the corona noise and the shining effect of the aluminum wires, we proposed a sandblasted conductor. The process of sandblasting is made internally in a special machine that, through some guns, sprays a specific sand on the conductor to reach a rough and clean external surface.
