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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 13:47:30 -0800
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On Sat, 30 Nov 2024 17:40:25 +0000, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:

>On 30/11/2024 15:53, john larkin wrote:
>> On Sat, 30 Nov 2024 12:37:55 +0100, Jeroen Belleman
>> <jeroen@nospam.please> wrote:
>> 
>>> On 11/30/24 11:50, Martin Brown wrote:
>>>>
>>>> SO that makes me wonder how big is a 1GW transformer operating at 400kV?
>>>> And how much does one cost?
>>>
>>> There are plenty of images and descriptions of 400kV transformers
>>> on the web. You have to be an insider to get a fair idea of the
>>> cost. These things are usually made to order. I'd guess a 1GVA
>>> 400kV transformer to be between 6 and 7 M$. I'm not an insider
>>> though.
>>>
>>> Jeroen Belleman
>> 
>> https://www.dropbox.com/scl/fi/fte4dwtoui96xgeyn9f0h/XfmrScatter.JPG?rlkey=8uh77rliholy3iyd9y8lnvdwc&raw=1
>> 
>> I should add dollars.
>
>Thanks John, but that looks a bit pessimistic.

I just looked up a bunch of transformer data sheets. Big oil cooled
things might be a lot better.


>
>If I read it right that's 200lb=0.1T for 1kVA so 10^5T for a 1GVA unit.
>
>My current best guess from 4.5T for 1MVA and so  4500T for 1GVA (plus a 
>bit extra supporting structure to deal with the extra weight).