I'm having a hard time picturing where the conversion and synchronization of a turbine spinning at thousands of RPM is reduced to 120Hz. A mechanical gearbox between the turbine and a dynamo?
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The number of poles of a synchronous generators dictates that. f = N * P / 120 e.g. a 2-pole generator rotating at 3600 rpm generates a 60 Hz frequency. You can also add a gearbox to add an additional ratio, or to adjust variable speed (e.g. wind turbines).
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Nuclear plants run at lower temperature steam, so to compensate they often run at 1500/1800 and use a quadrupolar generator.