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Toronto Power Company Generating Station | | | On the Side of Caution |  |
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Toronto Power Company Generating Station | | | On the Side of Caution | |
The numer 8 simply refers to the "Unit number". Each powerplant assigns a number to each generator or "unit". If a person were referring to this particular generator they'd say something like "Toronto Power, Niagara Falls Station Unit 8".
The stator is an extremely massive casting as it has to resist the torque from the turbine as mechanical energy is converted into electrical energy. It also has to remain round and accurate to its original dimensions despite temperature changes, and magnetic fields. Plenty of good heavy cast iron insures great dimensional stability and great dampening of any slight vibrations. It is also massive to resist torque shock loads if the unit were to be tripped off line suddenly due to some electrical problem in the grid. The stator is solidly anchored to the concrete of the plant and that, I am sure, is tied to solid rock. A hydro plant has to be one of the most solidly built things.