[time-nuts] Mains Frequency

[Andy Talbot]

The mains timing error was still running ~50 seconds fast at midnight
yesterday, and this morning was still at +40 or so seconds.   But over
Saturday the frequency has dropped lower than I've seen it go for several
days, at one point it must have dropped to 48.8Hz, below scale on my
display and that is flagged.  It's caught up now  Mains timing is now just
0.7 seconds fast - and 2s of that was over the last hour or two.

Andy
www.g4jnt.com



On Fri, 12 Feb 2021 at 11:12, Andy Talbot <andy.g4jnt at gmail.com> wrote:

> I maintain a real time display of mains frequency, and the cumulative
> timing offset from real time.   It was last reset 10 days ago when we had a
> brief power outage (HV fault a mile or so away).
>
> Since then, for the first few days the timing discrepancy kept within
> plus/minus perhaps 20 seconds.  But in the last couple of days is has crept
> up and is now sitting at +48 seconds.   On average the frequency will have
> been running about 0.013Hz high to give that.
>
> Given Nat. Grid still aim to average out to exactly 50Hz, does anyone know
> if there is a time scale associated with that long-term average?
>
> Andy
> www.g4jnt.com
>
>
>
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