Rotation of Synchronous motor shafts are sync'd to the frequency of the power source. Rob the motor of 2 cycles per second, times 3600 seconds in an hour, and pretty soon you have a fair number of revolutions! Let that go on for 6 or 8 hours, and you've got an error on the order of 7- 10 seconds.
It evidently depends on the number of poles in the armature, and the clock gearing as well, although I never had time to model the whole system.
I think the power company knows very well how we depend upon their 60 HZ being 60 Hz. I would think, however, that lowering the freqency would raise current on brown-out days. It sure decreases the efficiency of the transformers in the circuit.
It is like the politicians who got around the Constitutional requirement to have Congress declare war. Just don't call them wars! Actually, it isn't like that at all. Sorry.
Come on, this is supposed to be an engineering site, think basic electricity. If your generator is loaded down, it slows down. If your grid-tie lags the rest of the grid, you draw current from it. Your electric company buys power just this way. If you have excess power available, speed up the genny and pump the juice to the grid. Your electric company makes money just this way. This buy/sell scheme has almost trumped the goal of keeping a constant number of power cycles (at 3600 a minute) per day. All those millions of clocks? They don't really care if you are on time or not!
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