>> I think that you will cook your transformer if you over-voltage the input
>> that much.  Core saturation.
>
>Doesn't core saturation depend on current, rather than voltage? I would
>think that you'd have less chance of saturating at 277V than 230V.
>
>Bob Ammerman
>RAm Systems


Nope. The core must standoff the volt*second product. Thus, more volts
needs more core. Likewise, lower frequency means more seconds and also
means more core needed.

This is why higher freq operation is often desirable. If a transformer is
designed for one input voltage and you find you must increase the voltage,
it helps to offset this by raising the operating frequency also if possible.

The core in question *may* work at 277V but this can only be determined by
testing or consulting the manufacturer.  Since excess core usually means
excess expense, the cores are usually made to just barely do the job and
typically run warm at rated load. Raising the voltage will usually raise
the temperature also. Determination of suitability is left as an exercise
to the student.

Tom M.

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