A wind turbine generates electricity by using the kinetic energy of wind to spin its blades, which are connected to a rotor. The generator then converts this mechanical energy into electrical energy.
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The structure at North Dakota's Garrison Dam houses five turbines – 'Francis' turbines that turn at a rate of 90 revolutions per minute (rpm). The water takes on energy as it flows down the penstock and is carried with force to the turbine.
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This leads to windage, where rotating components overheat due to friction with residual air or steam. As temperatures rise, thermal expansion can cause blade-to-casing contact, resulting in severe rubbing, blade liberation, and extensive damage to shaft line components.
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This load increases as the load current circulate in the stator windings increases the mechanical resistance presented by the generator shaft to the engine shaft.
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