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Renewable Energy 


essential to achieve the 20+ year operating life that customers are requesting. Long service periods of five years or more are also typical, since the cost of visiting underwater installations is substantial.


Fig. 3. Altra can supply a range of dry and ‘wet’ solutions; Twiflex caliper disc brakes traditionally work in the dry environment of a sealed nacelle, but may be developed for use fully exposed to sea water.


Floating devices have an advantage here, but still require the same technology to control peak loads and ensure maintenance is possible in controlled conditions.


Te brakes deliver a fail-to-safe operation that relies on a spring applied and, in most cases, hydraulically released principle; the electro- hydraulic power pack is tied into the PLC controller, if the unit loses grid connection or speed control the brakes apply to safely stop the turbine.


Fig. 4. Wichita multi- plate clutch designs may be configured to act as a torque limiting device, protecting the drive train from torque spikes induced by extreme weather conditions.


HIGH PERFORMANCE


Electric actuators for the power plant industry Reliable, powerful, precise control. AUMA offer a large portfolio of actuator and


gearbox type ranges. ■ Automating all types of industrial valves


■ Standardised interface for various site control systems


Currently, the largest ‘wet’ brake solutions are capable of providing dynamic braking torque up to 3MNm. As indications suggest turbines will need to be rated at 2-3MW to become commercially competitive, it is inevitable that sizes will increase and this technology – proven at the 1MW scale – will be there to address this future demand. l


Anthony George is from the Heavy Duty Clutch and Brake (HDCB) Division of Altra Industrial Motion. www.altramotion.com


■ Plant Asset Management functions


■ Service worldwide


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our solutions for the


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www.auma.com For more information ✔ at www.engineerlive.com/ipe anzeige_halbe_european_business_engineer.indd 1 11.03.2014 15:16:55


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