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A Feat of Strength in Kaprun: 355-t Rotor Successfully Lifted into Place at the Limberg III Power Plant
Despite state-of-the-art technology, the lifting of the rotor involved manual work. The crane operator used his joystick to steer the machine element into the stator cavity, millimetre by millimetre. The margin of just 4-5 mm was continuously monitored by his signallers. The lifting was the culmination of over a year of preparatory work and planning. Because the finished rotor would have been much too big and heavy to transport through the 5.5 km of tunnels on the construction site, it was painstakingly assembled in situ at a site in the power plant cavern in around 12 months. Layer by layer, the sheets, which are only 0.5 mm thick, were stacked in overlapping manner until the last of a total of 80,000 rotor sheets was in place. At that point, the lamination stack reached an axial length of 3.70 m. The rotary motion of the rotor converts hydropower into electrical power with a maximum output of 240 MW. Unlike the Limberg II pumped storage power plant, the generator sets of Limberg III can be operated at variable speed, enabling an output range of between 20 and 240 MW per unit for turbine operation and between 100 and 240 MW per unit for pumping operation. This enables them to not only store excess electricity for a longer period of time, but also to step in within seconds to compensate for voltage fluctuations in the power grid. The Limberg III pumped storage power plant was opened in September 2025.
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