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Re: [ARSCLIST] Odd Speed

Hello, Steven,

Today they are--sort of. There are actually three different "grids" that
free-wheel in respect to each other. There is power transfer across these
boundaries by using DC transmission lines (large AC-->DC and then DC-->AC

In the interim report on the Aug 14, 2003 blackout, there is a good
overview of this

I'm not sure how accurately this was done system-wise in 1963. I do recall
in that era two clocks in power control rooms. One running off NBS time,
the other running off the grid. They needed to agree once a day.

There have been various reports about how much the power drifts and what is
the power company commitment to average it out to precisely 60.000... Hz.



At 03:05 PM 3/5/2004 -0500, you wrote:
----- Original Message -----
From: Richard L. Hess
>I guess, at least that day, the 60Hz in St. Louis was pretty much spot on!
Aren't all the electrical systems in North America synchonized at an exact
60Hz, in order to avoid various spectacular results when they are
(which is often the case)? I have ni idea how this is done, but I think I've
been told it was/is done...
Steven C. Barr

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