I'm hoping this is the correct forum to ask this question. I'm a structural engineer designing a pile supported foundation for a 10MW Westinghouse Steam Turbine Generator. I was wondering if anyone in this forum knows whether a locked rotor force couple initiated by the generator will also engage the mass of the steam turbine through the gearbox. My initial thought was that if the generator locks suddenly, that the momentum of the turbine blades would first strip the teeth of the gearbox (like a fuse would) before transferring rotational load to the turbine mass. Our mechanical engineers say that all masses (turbine, gearbox and generator) will be engaged in a locked rotor condition and to design the foundation to resist the force couple developed from each of the masses. I was hoping someone would help me understand why the gearbox does not serve as a fuse for the locked rotor condition. Any help on this subject would be appreciated.
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