Retrofit of flagship megawatt model -- Vestas replaces yaw rings

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Vestas is replacing the yaw ring on 21 of its flagship 1.65 kW wind turbine out of 160 sold so far. In all cases, imprecise alignment of the blade pitching mechanism has either damaged the yaw ring or could be expected to cause damage. As an extra precaution, Vestas is checking and adjusting the pitch regulation on all of the 1.65 MW units and fine tuning other controls.

Each yaw ring replacement will cost about $50,000 dollars, says Vestas service manager Hans Laurids Pedersen. The retrofit will be carried out on one turbine in Norway, one in Spain, three in Sweden, eight in the United States and eight in Germany. He adds that the adjustments made on other 1.65 MW turbines appear to have halted the problems. No new cases of yaw ring damaged have been detected in the past three months.

The problem was caused because the three blades were not pitching identically, says technical director Mogens Filtenborg.

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