Drone inspections

Rotor blade inspection incl. lightning protection measurement by special drone

Not only more accurate, but also more efficient 

In order to maintain the value of a wind turbine, regular maintenance and inspections are necessary - for example, a close inspection of the rotor blades.

However, the latest generation of turbines is already being planned with hub heights of well over 150 metres and rotor diameters of up to 160 metres. For turbines of this size, conventional rope access technology could only be realised at great expense for safety reasons. ENERTRAG is therefore replacing it with the use of special drones. The height of the turbine or the length of the rotor blades no longer play a role. 

The innovative drone technology not only protects employees, but also offers a higher error detection rate thanks to excellent image quality and autonomous flight patterns. 
Drone inspection works equally reliably onshore and offshore and therefore offers great potential for operators of wind turbines on land and at sea. 

The new lightning protection method  

Rotor blade inspection and lightning protection measurement by drone involves automatically flying over the rotor blades of wind turbines. A high-resolution camera on the drone records images of the rotor blades from various angles, which are then precisely analysed.    

At the same time, a field strength measuring device, which is also attached to the drone, detects a voltage applied to the blade root by a high-voltage generator along the lightning protection line of the rotor blade. Possible interruptions can be localised using the collected data. 

Advantages  

Find out more about rotor blade inspection including lightning protection measurement by drone in the following video.

Technology from Switzerland  

The innovative drone inspection system was developed by ENERTRAG Betrieb and Sulzer Schmid Laboratories A and was launched on the market in May 2022. The technology of the renowned cooperation partner makes it possible to fully photograph the surface of rotor blades of any size in a fraction of the time with high-resolution imaging and a large detection field.  

Up to and including September 2022, around 100 inspections were carried out and the processes as well as the software and hardware were continuously optimised based on the experience gained, so that an optimised version of the drone inspection has been available since the end of 2022.  

The drone inspection consists of two components: firstly, the automated flight model and the 3DX™ Blade Platform data evaluation platform from Sulzer Schmid Laboratories AG and, secondly, the method developed by ENERTRAG Betrieb for measuring lightning protection on wind turbines using drones. In combination, these components make it possible to carry out rotor blade inspections and lightning protection measurements more intelligently, quickly and safely than was previously possible.