Endesa begins work to replace the cabling of the towers in the Bay of Cadiz


Endesa has started work to replace the high voltage wiring of the electricity pylons in the Bay of Cadiz. For more than a month, about thirty specialized technicians will work on replacing the 14,928 meters of cabling that connects the two pylons and which is replaced every 40 years, the estimated lifespan of these cables.

The pylons in the Bay of Cadiz are connected by two lines each consisting of three conductor cables. The works, in which Endesa is investing 700,000 euros and which has the collaboration of the international company of Andalusian origin AMETEL, began with the so-called unloading of one of the lines, that is, they have been left without voltage to operate safely, while the other line continues to supply power and operate normally.

Once the absence of tension in the conductors has been ensured, all the specialized machinery that will be used to replace the 2,488 meters of the first of the cables is being installed. On the mainland, the braking machines, the traction motor, the cable reels and the anchors have been located, while the pulleys that will allow the passage of the cables have been placed 150 meters above the ground.

Likewise, the company’s technicians changed the glass insulators located in the gantries of each tower and in each of the towers, and removed the shock absorbers that protect the cables, which will be reinstalled once they are will be done. the wiring.

In the Cadiz Free Zone, on Calle Ukraine, the brake or braking machine has been placed with the reels of new cables, weighing 4,680 kilos each, while the winch or traction motor has been placed in the area from Puerto Real (Pórtico Cabezuela) where the former driver will be picked up. Both devices are heavy machines that will have 8.5 ton anchorages, so the entire infrastructure is capable of withstanding a force of over 12,000 kilos, the equivalent of lifting 9 medium-sized vehicles, although than the actual strength he was estimated to be 8,000 kilos.

Con toda la maquinaria preparada en los próximos días empezará la fase más delicada, en la que el cable antiguo se engancha al cable guía bajando desde une altura de 50 sur el mar a 15 metros, motivo por el cual se cortará el tráfico maritimo predictmente el Friday.

With the cable at this height, the guide cable is hooked that will go from tower to tower until it reaches the Cabezuela gantry in Puerto Real, where the old cable will be collected, of which the sample will then be analyzed to know its condition. With the guide cable already between the two towers, the final cable is placed, an element that has been manufactured exclusively for these towers by the Navarrese company Trefinasa. It is a cable with a special steel core, more robust, very different from those normally used, since these cables must withstand not only the tension between the towers, but also the climatic conditions of the area in which they are located.

Once the new cable is in place, the dampers are installed, 72 vibration control systems that guarantee the correct operation of the installation in complete safety. All these systems, which will also be replaced in this work, are of Spanish manufacture: the insulators are made by the Segovian company Saint Gobain La Granja, while the shock absorbers come from the Navarrese company Saprem.

This operation will be repeated with each of the cables, the total replacement of which is estimated between 5 and 6 days per cable.

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