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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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    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.

    A couple of guesses as to why - firstly our US cousins are much more used to using transformers as they have a hodge-podge of voltages to work with (120V, 208V, 240V, 277V, 480V etc) where as we just use 230/400V for almost everything. Transformers will also add a bit of impedance to the circuit - and we're a lot fussier about Zs than I suspect the Americans are (at 120V the touch voltage for a L-PE fault is likely no more than 60V so fast ADS is far less of a priority).

       - Andy.

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    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.

    A couple of guesses as to why - firstly our US cousins are much more used to using transformers as they have a hodge-podge of voltages to work with (120V, 208V, 240V, 277V, 480V etc) where as we just use 230/400V for almost everything. Transformers will also add a bit of impedance to the circuit - and we're a lot fussier about Zs than I suspect the Americans are (at 120V the touch voltage for a L-PE fault is likely no more than 60V so fast ADS is far less of a priority).

       - Andy.

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