Transformer question

This topic has 3 replies, 2 voices, and was last updated 9 July 2026 at 12:17 by Wade Beatty.

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9 July 2026 at 11:17 #855492
Wade Beatty
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@wadebeatty78296
I am looking at a transformer for sale, it lists primary as 400V and secondary as 230V… Does a transformer care? Can i supply 400V and get 230 out ?

Thanks,

Wade
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9 July 2026 at 11:42 #855495
John Haine
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@johnhaine32865
Yes, but note this appears to be a 3-phase transformer. If you use it for just one phase its VA rating would be reduced. One of the advantages of 3 phase is that the amount of iron in transformer cores can be reduced for a given current as some of the magnetising flux cancels out – this wouldn’t happen with one phase so the “magnetising inductance” will be higher. In reply to your first question, the transformer doesn’t care what the voltages are it just steps up or down by its turns ratio, except that if you exceed the rated volts the insulation may break down. Note also that if you just use it with one phase connected, the other terminals would also be live as some of the core flux paths are shared
9 July 2026 at 12:16 #855508
Wade Beatty
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@wadebeatty78296
I am in Norway and have 3 phase 220-230
9 July 2026 at 12:17 #855509
Wade Beatty
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@wadebeatty78296
Thank you John

Wade
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Transformer question

Transformer question

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