Changes 133 Developed a thicker skin: The new generation of rotor cables have expanded cable cross sections.
Optimum adaptation. Since the manufacturer-independent machine allows switching from star to delta operation, considerable speed variability and thus optimal adjustment of the machine to existing wind conditions is achieved. In the star operation, the generator is loadable up to 1,000 kW and in the delta operation up to 2,000 kW. But the new generator impresses not only in regards to output and speed variability. New roller bearing protection design. The development of a new roller bearing protection design took into equal consideration the value of reliability and cost efficiency. Due to their special design, the roller bearings feature an improved, insulated seat, preventing issues such as the destruction due to unwanted harmonic currents. Apart from facilitating installation and repair, the new concept also reduces potential subsequent costs.
Better protection against contaminants. In order to maximize effective cooling and protect the slip ring assembly from contamination, an external air exhaust and filter was added. This greatly reduced the risk of short-circuits and punctures from extensive contamination. Efficient cooling system. Three separate external 3 kW asynchronous motors drive the cooling unit to achieve optimum cooling even at partial load, irrespective of speed. The new generator has been certified by Germanischer Lloyd (an expert assessment based on type testing) for use in the V66 VCS®, V80 and V90 2.0 MW models and the G80 to G90 2.0 MW models. Not only the generators, but also individual turbine components, such as the cables, are exposed to considerable stresses during operation.
Damage from overheating. Overheating of the generator rotor cables area often causes irreversible damage. Symptoms of overheating can be detected during visual inspection, but the replacement of damaged cables will be inevitable. Preventing risk from the start. The risk of overheating can be avoided from the start by replacing such cables with rotor cables with a larger cross section. Specially developed tools and working processes allow the rotor cables to be replaced directly in the turbine without using a crane. These upgrades are available immediately. More information is available at www.availon.eu.
“ Vestas” and “VCS” are registered trademarks of Vestas Wind Systems A/S, DK. “Gamesa” is a registered trademark of GAMESA CORPORACION TECNOLOGICA, S.A., ES.