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Siemens has produced the first batch of its new 75 meter long B75 rotor blades. They will be installed on the second prototype of Siemens'' 6-MW offshore wind turbine, which will be erected in the second half of the year
Siemens has manufactured the world’s longest rotor blades for a wind turbine, a culmination of the rapid advancement in wind power technology during the last 30 years. Created using specialist technology, the B75 blades measure a staggering 75 metres in length.
Siemens has already seen 6-MW turbines installed at the UK's Gunfleet Sands wind farm, albeit with 60-m (197-ft) blades. Thanks to a process Siemens has branded "QuantumBlade," it claims the B75s weigh four fifths of conventional blades.
The 75 m blades will be used on Siemens' 6 MW (SWT-6.0–154) offshore wind turbine. This turbine can also be equipped with a 120 m rotor, standard equipment for the Siemens 3.6 MW offshore turbine, to allow the 6 MW turbine to be installed in locations where air traffic regulations dictate a maximum tip height of 150 m.
Initially, three B75 blades will be put to use in a prototype 6-MW offshore turbine at Denmark's national test center at Østerild. The sweep of the completed turbine will cover 18,600 sq m (200,200 sq ft) and the tips of the blades will move at 290 km/h (180 mph) at full lick.
The 75 m blades are manufactured using Siemens patented IntegralBlade® technology. The blades are made of glass reinforced epoxy resin and manufactured in one piece using a closed mould process. The glass fibre reinforcement is laid out in a special moulding arrangement with a closed outer mould and an expanding inner mould.
Here the rotor is assembled on the ground of the Østerild test centre in Denmark, a windy site near the coast, which is very favourable for testing turbines. The actual rotor consists of three of the 75 metre rotor blades. The blade is operated at variable speeds of five to ten revolutions per minute.
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