[time-nuts] Mains Frequency

[Alan Melia]

Hi Andy I recall many years ago when most of us had mains synchronous motor 
clocks the frequency was tweaked nationally to set the clocks right at I 
think 06:00 every morning. I guess since most now use quartz clocks that has 
been dropped.........interesting!  Just turn the wind down a bit will you 
:-))

Alan
G3NYK

----- Original Message ----- 
From: "Andy Talbot" <andy.g4jnt at gmail.com>
To: <RSGBTechnical at groups.io>; "Discussion of precise time and frequency 
measurement" <time-nuts at lists.febo.com>
Sent: Friday, February 12, 2021 11:12 AM
Subject: [time-nuts] Mains Frequency


>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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