[time-nuts] Re: Power line: 15 second drift in one day

[Jeremy Nichols]

I am FNET #853 in the western interconnection.

Jeremy



On Fri, Jun 7, 2024 at 4:40 PM Ryan Stoner via time-nuts <
time-nuts at lists.febo.com> wrote:

> FNET monitors time drift.
>
> https://fnetpublic.utk.edu/time_error.html
>
> On Fri, Jun 7, 2024, at 08:51, John Vendely via time-nuts wrote:
> > As I recall, the western power grid system (WECC) discontinued line
> > frequency regulation for timekeeping purposes some time ago. The eastern
> > grid (EI) still maintains time and, here in Florida, line-operated
> > clocks typically stay within about +/- 15 seconds of my UTC clocks.
> >
> > 73,
> >
> > John K9WT
> >
> > On 6/7/2024 1:16 AM, Larry McDavid via time-nuts wrote:
> >> The long-time, cumulative accuracy of your mains frequency seems
> >> variable by location. I've seen a cumulative error of 2 minutes here
> >> in Southern California, with local time usually being slow. For
> >> example, I last accurately set a 6-digit mains-synchronized clock on
> >> May 9, 2024; now, some 28 days later, my mains-synched clock is 01:45
> >> mm:ss slow.
> >>
> >> Some insist regs prohibit this. If so, the regs are being ignored.
> >>
> >> I have a mains-synched clock beside a GPS clock and take a photo to
> >> document the comparison.
> >>
> >> It is not a function of the clock. I have three kitchen appliance
> >> clocks and they all agree with the 6-digit mains-synched clock within
> >> 1 second. Yes, it is tedious to accurately (well, within one second)
> >> set appliance clocks, but doable...
> >>
> >> Best wishes,
> >>
> >> Larry McDavid W6FUB
> >> Anaheim, California (SE of Los Angeles, near Disneyland)
> >>
> >> On 5/30/2024 12:33 AM, Hal Murray via time-nuts wrote:
> >>>
> >>> Last Monday was Memorial Day in the US, a big start-of-summer holiday.
> >>>
> >>> The power line clocks lost 15 seconds that day.
> >>>    https://www.glypnod.com/TimeNuts/60Hz/60Hz-15sec-day.png
> >>>
> >> ...
> >>> Does anybody know when they officially turned off time keeping?
> >> ...
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>
> --
> Ryan Stoner
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