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Autotransformers & Buck/Boost - use in the UK

willy

I need to reduce a 400V 3P+N supply voltage as it can drift over the +10% limit, I don't particularly need to regulate it, just get it a bit lower.


Initially I though a double wound transformer close to 1:1 with a few tap links to let me select a lower output.


From a bit of searching I can see a lot of information on the use of autotransformers and buck-boost transformers in the US, but not much for the UK.
Is using auto/buck-boost acceptable for the UK or are there some fundamental reason not to do this? These transformers will be significantly cheaper and much smaller, which makes them appealing.

The rating would be around 100-120kVA

Thanks

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  • 0

    What's the supply coming from? (presumably not from the public grid as that has a statutory +10% limit).

      - Andy.

  • 0 in reply to AJJewsbury

    Private network, that is going to be difficult to get tapped further up the network (which would be the best solution)

  • 0 in reply to willy

    it is done - actually there was a link to one outfit doing it only a few days ago

     Hello, has anyone come across the emerging technology of spintronics within buildings? However their  blurb is so much waffle you'd be hard put to realise that is what they sell as part of their great new wonder cure.

    Google searches for

    'Whole site Voltage Optimisers' will bring up companies offering more or less what you suggest and yes, they are usually auto transformer based for reasons of size weight and cost..

    example

    But, if you can possible get the tap settings changed on your own transformer, that would be far more sensible.

    120kVA is a big lump of metal, even for an autotransformer doing 10% - in effect the same as a 12kVA double winding with the full current secondary at 24V in anti-series with the supply to buck it down from 240 to not quite 220.

    Mike.

  • 0 in reply to mapj1

    Thanks for the comments, I agree it'll be a big lump but not as big as a rated double wound transformer.

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