More than half towers of a wind park were unexpectedly shutdown during regular operation. During the investigation, supplier of the wind park stated that the shutdown was caused by the control system which identified risk of frost – it posed a threat to the surrounding environment and possibility of injuring nearby people by falling ice from the blades. Interesting fact was, that not all towers were shut down, but only part of them. Supplier tried to explain this by varying meteorological conditions at different towers – air thermic, elevation etc.
However, KEYSYSTEM – monitoring and control system showed that the towers that were stopped had a higher temperature of oil in their gearboxes than in the other towers. The wind park owner then asked the supplier whether the shutdown was not caused by this, even though the temperature was still in the safe limits. Power plant owner then also realized that the supplier performed firmware update on the towers that were stopped, but not on the others. By analyzing further data, the supplier came to the conclusion that the new firmware was faulty – it evaluated certain conditions wrong and set the turbine propellers angle of attack sub-optimally, leading to an increased temperature and safety shutdown. Due to fast intervention of KEYSYSTEM, it was possible to fix incorrect parameters and start the whole power plant in short time.