[GreenKeys] Frequency deviations in Continental Europe including impact on electric clocks steered by frequency

[Ralph Mowery]

In the US the frequency is adjusted for the long term also.  If slow for a while, it will speed up when the load is light to make up for the slow heavy load period.

I don't believe I have ever seen a mechanical clock that operated off the AC line that had a governor or some other device to regulate the time that did not depend on the line frequency to be 60 Hz. .

 I don't know what kind of clocks they had when I went to school, but most all were tied into a master clock in the office so all school clocks would be the same.  I do remember seeing them speed way up a few times when the time would get off.

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Sam Hallas via GreenKeys
Sent: Tuesday, March 06, 2018 4:36 AM
To: Paul Heller; Greenkeys
Subject: Re: [GreenKeys] Frequency deviations in Continental Europe including impact on electric clocks steered by frequency

Paul Heller wrote:
> It seems power in Europe is fluctuating. Has anybody’s teletypes in 
> Europe been affected?
> 
> https://www.entsoe.eu/news-events/announcements/announcements-archive/
> Pages/News/Frequency-deviations-in-Continental-Europe-including-impact
> -on-electric-clocks-steered-by-frequency.aspx

There'd have to be a huge drop in frequency to put a teletype out of synch!

Here in the UK it's never been a problem as the National Grid controllers up the frequency overnight to compensate for losses during the day. The long-term accuracy for clocks has always been guaranteed.

If it worries folk perhaps they should stick with the older models that had DC motors and mechanical governors!

Sam