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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Grand Apagon - Electricity (not) in Spain
Date: Thu, 1 May 2025 21:42:22 +0200
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On 2025-04-30 14:11, Gerhard Hoffmann wrote:
> 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 noticed in my µW oven. I was very surprised.


> 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


-- 
Cheers, Carlos.