Transformer input over voltage

[PramodMunaweera]

What happens when the primary voltage of a transformer is higher than the rated input voltage? For example, 230/12V transformer, what happens if input voltage exceed 230V .

Thank you!

 

[FvM]

Exceeding the rated voltage by more than 15 or 20 % will cause core saturation, high no-load current and possibly a burned winding.

 

[Audioguru]

If the transformer is able to work properly when its input voltage is higher than its rating then of course its output voltage will also be higher.