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From: john larkin <JL@gct.com>
Newsgroups: sci.electronics.design
Subject: Re: 1GW (sic) Battery Energy Storage Systems
Date: Sat, 30 Nov 2024 07:51:43 -0800
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On Sat, 30 Nov 2024 10:50:07 +0000, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:

>On 26/11/2024 03:15, john larkin wrote:
>
>> Having electricity used to be normal.
>
>UK power supply is generally way more stable than US. 

How many hours per year is your power out?

I'd estimate two total here, on avearge, but a pole on our street
toppled down recently and that took 5 hours to replace

Large-region power failures are very rare here, between major
earthquakes.

There was a forest fire east of Truckee this summer, and they shut off
power around a big trans line nedar Verdi for a few hours as a
precaution of some sort.

Power is impressively reliable here. Water too. Gas is reliable for
years at a time.



However, there is 
>a huge imbalance between where electricity is generated and it is used. 
>The North-South 400kV interconnectors are often maxed out at peak times.

The USA is 3.5M square miles. The UK is 93K.

>
>The public consultation was yesterday. It really is 1GW injection power 
>and 4 hours so a 4GWhr battery farm (40x bigger than the largest system 
>currently in the UK and being built by a startup with no track record!).
>
>It will have ~900 container modules of batteries as close together as 
>they dare (half the US regulation spacing) and in double lines of 50.
>
>SO that makes me wonder how big is a 1GW transformer operating at 400kV?
>And how much does one cost?

Big utility transformers are made to order, and that can take years.
The hazards there are obvious.

>
>I'm guessing the secondary to handle 2500A will have to be (30A = 2mm^2 
>so 3000A ~ 200mm^2 = 16mm diameter) and at a 40:1 stepdown the low side 
>will have to be 40x bigger cross section 6x linear size hollow core?). 
>Are these guesses approximately right? How many turns on each?
>
>How much soft iron core does it require (approximately)?

It takes special gear to measure the inductance of a utility-scale
transformer. A handheld meter won't do.


>
>The location chosen is very cunning. They will get paid not to produce 
>electricity by intercepting the payments (to not produce electricity) 
>currently made to wind farm owners in Scotland and off the NE coast.

Hey, I know how to not produce electricity.

>
>We don't have any worthwhile national infrastructure planning to speak 
>of and so this national level storage facility will be  approved by a 
>county council planning department (any one of them if built would 
>immediately be the largest BESS in the world). 3 within 20 miles of me.