Reliable sensors that monitor wind direction and speed help to achieve economically optimum operation and constant protection against critical scenarios.
Wind is what drives the rotor blades, and its kinetic energy is converted into electrical energy. This process works so well that onshore and offshore turbines are being built and operated in a range of sizes all over the world.
KRIWAN’s high-quality, long-lasting, permanently precise anemometers and wind direction sensors are used in a very large number of wind turbines. They allow condition monitoring and control systems to adjust the rotor blades constantly to current wind conditions.
In normal operation, the readings are used to ensure that the turbine only starts once a minimum wind speed has been reached – the economically viable lower limit. Accurate real-time data is also needed to set the rotor blades into the wind, because energy yields correlate directly with the accuracy with which the wind direction is tracked.
Below the economy limit, and above specified safety limits, the wind turbine is shut down by the CMS and the blades are moved into feathering position (freewheeling) or turned out of the wind and held in place by brakes in order to avoid damage or destruction.
- High IP protection categories
- Immune to interference by mist, rain, dust, and foreign objects
- Top quality metal casings – ensured by corrosion-testing prior to series approval using special salt-spray tests involving harmful gases
- Alloy quality constantly assessed using x-ray spectrography
- Electronics highly resistant to electromagnetic interference, including that caused by indirect lightning strikes
- IP protection category can easily be optionally upgraded
- Long operating life, precise, wear-free measurement, and high-grade bearings
- All sensors are routine-tested before delivery
- ICEfight version for reliable operation in regions with a high risk of icing
Monitoring the temperatures of generators, drive systems, bearings, and oil circuits in wind turbines.
When electrical energy is generated using movement as it is in wind turbines, friction and heat in the drive system, gears, brakes, and generator are virtually unavoidable. This is not a problem provided temperatures remain within a non-critical range. Temperature-critical components are embedded within a finally tuned overall system and evaluated using a condition monitoring system.
The temperature of the oil is monitored in various oil circuits that serve to lubricate and cool components and drive hydraulic actuators. If these temperatures rise above certain limits, thermal reactions can occur which reduce the quality of the oil and therefore impact negatively upon its intended function. Screw-in sensors are used to monitor this; they are immersed into the medium so that they can measure the temperature directly. A Pt100, NTC, or PTC (as required) is encapsulated in a pressure-proof metal casing and its signals are fed into the turbine’s CMS.