With the help of the latest drone technology, the inspection of wind turbines will become multiple times more efficient.
The inspection of a rotor blade used to be a complicated matter. Specially trained abseilers took on the dangerous job and photographed conspicuous areas directly on the blade. The data that was obtained in this way was then analyzed on site in tents, but only if the weather would not have allowed for inspections and was not available until weeks later.
The ROBUR members WKA (specialist for the inspection, maintenance and repair of rotor blades), the software company GIS (specialist for digitization) and the project planning specialists at TEC in cooperation with the Swiss drone experts of the company Sulzer & Schmid have developed a new solution. Instead of one system per day, teams equipped with largely autonomous high-tech drones now inspect up to 15 systems and send the data almost live to the back office, where it can be evaluated quickly and conveniently. The results are now available for the customer in an average of 10 days (often even faster), instead of multiple weeks. And since not only conspicuous areas are photographed, but the rotor blade as a whole is filmed and the data can be analyzed afterwards, in a dry and warm office, human errors can be minimized.
But this is not the end of the development story: The specialists from GIS, WKA and TEC are already working on a solution for using AI-support for the evaluation of the video material, so that the recognition of damaged areas can be mostly automated The result is a further increase in efficiency and a decrease of possible human errors during the inspection of images.
The solution offers several advantages to our customer Vestas.
The inspections are significantly more cost-efficient and can therefore be carried out more frequently, which in turn leads to optimized maintenance.
The results of the inspection are available faster and they are more accurate.
Last, but not least, ROBUR managed to inspect 1,200 turbines in only three months with a preparation time of only six weeks - and this under partly extreme weather conditions from minus 10 °C to plus 35°C and various wind forces.
In order to achieve this, four teams, operating simultaneously, had to cover more than 20,000 km in Sweden and Finland – a remarkable logistic achievement.
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