Wind farms: electrical and mechanical challenges for cables

Wind farms operate under very particular conditions. In addition to transmitting the energy produced by wind turbines, electrical cables must withstand stresses related to tower operation, environmental conditions, and the characteristics of the power generation network. This means that the selection of cables for wind energy applications must consider not only voltage and current, but also mechanical stresses and installation conditions that may affect system performance over time.

What electrical stresses do the cables face?

Within a wind farm, the energy generated by wind turbines must be transmitted to transformers and subsequently to the collector network and substation. In many projects, this distribution takes place at medium voltage, which requires cables with appropriate insulation and shielding systems. The main electrical stresses include continuous operating voltage, load variations, high currents, and possible overvoltages resulting from switching operations or transient phenomena. For this reason, factors such as voltage class, conductor cross-sectional area, insulation, and shielding must be defined according to the characteristics of each project. To better understand these applications, it is worth checking the article How to Correctly Specify an Electrical Cable on the Induscabos blog.

What about mechanical stresses?

The challenges of a wind farm are not only electrical. Wind turbines are structures continuously subjected to wind action, vibrations, and movement. Depending on the installation point, cables may also be subjected to tensile, bending, and movement stresses during installation and operation. In addition, external and underground sections may be exposed to other stresses, such as soil pressure, moisture, and temperature variations. These factors make it important to use cables specifically developed for this segment, with materials and constructions compatible with the conditions expected in the project.

Medium-voltage cables in wind farms

After the energy reaches the base of the tower and undergoes the transformation process, a collector network typically connects the different wind turbines to the main substation. Induscabos itself explains in the article Discover the Power of the Wind that the energy can have its voltage increased to 35 kV and then travel through an underground network to the wind farm substation. For this type of application, Induscabos offers solutions such as the Epronax AL Slim 105 Wind, a medium-voltage cable developed for applications that include the connection between generation and transformation systems in wind power plants. The line uses 105 °C EPR insulation and features a construction designed to block longitudinal water penetration, an important characteristic for applications exposed to moisture.

Why is correct specification essential?

An unsuitable cable can reduce system reliability, increase electrical losses, and require unplanned maintenance interventions. Therefore, cable specification must simultaneously consider the electrical, mechanical, and environmental stresses present in each section of the wind farm. Induscabos offers specific solutions for Renewable Energy, including cables designed for power generation and distribution in wind farms. Choosing the correct conductors helps ensure that the energy produced by the wind travels through the entire system safely, efficiently, and reliably.