Modern wind turbines used for energy last about twenty years. If we take into account that the activity index of these mills is approximately 60%, since they are disconnected when the wind does not reach enough power or if, on the contrary, it is too strong, they can operate without problems for more than 100,000 hours.
During these two decades it is necessary to carry out maintenance activities –they are usually reviewed about twice a year–, which can range from a simple review of the different parts to the repair of an unexpected breakdown or the lubrication of internal components . For a general inspection of the exterior or the blades, specialized robots are used that climb up the side of the tower using a suction system and send high-resolution images to the engineers.
If it is necessary to access the machinery, a side door leads to an internal ladder that goes up to the turbine cabin. There, depending on the size, two or more operators are in charge of maintenance tasks. To fix the blades, you go outside from the cabin, with special safety equipment; It is a complex and dangerous task , given that these turbines are installed, logically, in areas characterized by strong gusts of wind.
