I learned several new facts on wind energy this week from Kevin George, national account manager for wind energy at SKF USA LLC. First, I had no idea how large wind turbines actually are. The blades themselves are 40 to 80 meters in length (131 to 262 feet). The body that houses the drivetrain attached to the blades weighs 60 tons (the gearbox alone weighs 15 tons), and the tower is 100 meters (or 300 ft) high.
Ideally, each turbine has a life of 20 years, but they have not been around long enough to test that theory out. In fact, that theory is limited by the fact that gearboxes are failing every 5 years and generators inside the body are failing every 2 to 3 years.
Those failures are one of the biggest problems facing the wind industry right now. After all, while maintenance can be routine at plants, routine maintenance on a wind turbine is much more difficult (not the least of which is traveling up the tower to reach the body). Providing the right lubricant to the different parts in the turbine’s body is a highly involved process. The industry also faces extreme environmental challenges, as the turbines are located in remote areas with variable winds. If it rains, the turbines are not protected.
Since the turbines are still under OEM warranty, many in the industry are choosing to run to fail instead of setting up predictive maintenance practices. Running to fail has catastrophic results, as seen in this video of what happens when a wind turbine explodes:
Wind Turbine Explosion
Condition monitoring systems will need to play an important role in moving the industry forward, as they provide the kind of predictive maintenance the industry needs to avoid catastrophic failure. The industry also needs advanced bearings, seals and automatic lubrication systems to withstand the extreme conditions of the industry.
The possibilities for wind energy as an energy source are exciting, but the industry as a whole still has room to grow. Innovations in the field are badly needed and would have widespread impact.