[GTALUG] mysterious restarts

[Michael Galea]

On Mon, Jun 20, 2016 at 10:36:13PM -0400, Alvin Starr via talk wrote:
> On 06/20/2016 10:29 PM, Peter Renzland via talk wrote:
> >>On Jun 20, 2016, at 20:31, Michael Galea via talk <talk at gtalug.org> wrote:
> >>Someone remarked that the accuracy of 60 hz is good, and that over-frequencies would cancel under-frequencies. I would really doubt that they could do that to any great degree of accuracy. The grid is the largest machine on Earth, and there is more than just a single generator.
> >https://en.wikipedia.org/wiki/Utility_frequency#Long-term_stability_and_clock_synchronization
> >
> >
> https://www.ospe.on.ca/public/documents/presentations/electrical-grid-part-1.pdf
> around slide 40.
> It does not give a specific number for the "dead band"
> 
> -- 
> Alvin Starr                   ||   voice: (905)513-7688
> Netvel Inc.                   ||   Cell:  (416)806-0133
> alvin at netvel.net              ||
> 

Out of interest, here are the frequencies the grid had each minute 
in the last 1-2 days. 
# grep "FREQ value 59\.94" /tmp/MGC* |wc -l
0
# grep "FREQ value 59\.95" /tmp/MGC* |wc -l
16
# grep "FREQ value 59\.96" /tmp/MGC* |wc -l
99
# grep "FREQ value 59\.97" /tmp/MGC* |wc -l
282
# grep "FREQ value 59\.98" /tmp/MGC* |wc -l
464
# grep "FREQ value 59\.99" /tmp/MGC* |wc -l
459
# grep "FREQ value 60\.00" /tmp/MGC* |wc -l
385
# grep "FREQ value 60\.01" /tmp/MGC* |wc -l
302
# grep "FREQ value 60\.02" /tmp/MGC* |wc -l
144
# grep "FREQ value 60\.03" /tmp/MGC* |wc -l
68
# grep "FREQ value 60\.04" /tmp/MGC* |wc -l
3
# grep "FREQ value 60\.05" /tmp/MGC* |wc -l
0

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-- 
Michael Galea