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From: Gerhard Hoffmann <dk4xp@arcor.de>
Newsgroups: sci.electronics.design
Subject: Re: Grand Apagon - Electricity (not) in Spain
Date: Wed, 30 Apr 2025 14:11:10 +0200
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Am 30.04.25 um 12:41 schrieb Carlos E.R.:
> On 2025-04-30 11:59, Liz Tuddenham wrote:
>> Bill Sloman <bill.sloman@ieee.org> wrote:

>> The grid frequency begins to fall so energy from the moving parts is
>> converted to electrical power which is fed into the grid to increase.
>> the frequency.  This results in a loss of stored mechanical energy which
>> causes the turbine to begin slowing down - which is detected by the
>> control system and used to feed more water/gas/steam into the turbine so
>> its speed is returned to normal.
> 
> I understand that the turbine doesn't actually slow down, because the 
> generator starts working as a synchronous motor drawing energy from the 
> network instead; this is detected by the control system and feeds more 
> water/gas/steam, etc.
> 
> As long as the network keeps the frequency.

Actually, the grid frequency is a bit elastic.
We had that in the European grid some years ago, when
some Balkanese enclaves / exclaves did not care much
about cos_phi correction and the grid drifted slooowly
to a lower frequency. No bad consequences other than some
wall clocks were a few minutes late after a week or two.

I found that easy to measure with a time interval counter.
(ps resolution in a second elapsed time)

< 
https://www.flickr.com/photos/137684711@N07/38870750440/in/datetaken/lightbox/ 
     >

Cheers, Gerhard