[time-nuts] More 60 Hz data/graphs

Bill Hawkins bill at iaxs.net
Mon Jul 4 04:52:07 UTC 2011


Hal,

That's good stuff. Sadly, I've got to convert UTC to your local time to
interpret the results, so I haven't done it. Tom's MJD will be even worse.

The reason is that the loads that cause frequency droop occur during
workdays. Lost cycles are made up at night, so I need to know when local
day and night occur.

At the present time (before July 15th), the power dispatching center for
an area tries to end the day (perhaps at 7 AM) with exactly 60x60x60x24
cycles of power generated. This keeps the clocks on time, and balances
the power budget for the day - no extra cycles given away and no cycles
stolen from other areas.

The Time Error Correction (TEC) elimination experiment (to find out who
notices the loss) is motivated by the number of frequency excursion (not
trip) errors that occur when dispatch requests a correction. It costs
the generating plants money (nothing else drives change today) to
increase power on demand - in fuel and stress on the equipment.

With any luck, my next message will be about the frequency control
problem.

Bill Hawkins


-----Original Message-----
From: Hal Murray
Sent: Sunday, July 03, 2011 11:15 PM

I've moved the 60 Hz stuff from
  http://www.megapathdsl.net/~hmurray/time-nuts/
to
  http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/

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The main graph is now up to sightly over 4 days.
  http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz.png

Peak-to-peak is almost 8 seconds.

The slew rate is pretty fast in a few places.
  1 second in 1/2 hour at hour 64.
  4 seconds in 3 hours at hour 13.
  2.5 seconds in 3 hours at hour 44.
  7 seconds in 7 hours at hour 91.

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