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

[Joseph B. Fitzgerald]

Maintaining grid reliability AND time error correction are odds with each other, since the correction requires operators to intentionally operate the grid away from the nominal 60.000 Hz, giving up safety margin.        Keeping accurate grid time is relatively low on an operator's priority list, and there is a lot of discussion about doing away with it entirely, see for example https://www.nerc.com/pa/Stand/Project%20200705%20Balancing%20Authority%20Controls%20DL/Summary_Paper_Time_Error_Correction_12Sep08.pdf


Here are the current procedures in effect for Time Error Correction in California  https://www.caiso.com/documents/rc0220.pdf

-Joe Fitzgerald

________________________________________
From: Larry McDavid via time-nuts <time-nuts at lists.febo.com>
Sent: Friday, June 7, 2024 1:16 AM
To: Hal Murray via time-nuts
Cc: Larry McDavid
Subject: [time-nuts] Re: Power line: 15 second drift in one day

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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