Re: Obtaining 460v from a "480 -> 240" ACME Transformer

Ignoramus20688 <ignoramus20688@xxxxxxxxxxxxxxxxxxxx> wrote:


My first question is, am I correct in assuming that I could use it in
reverse to get 460v from 240, at some reduced kVa. Also, what is the
realistic kVa number I could get from it.


IIRC, step up / step down transformers do have a few tricks to make them more efficient
going one direction. I belive there was some mention of eddy currents and such because
one winding was next to the core and the other farther away or something like that.

This was a recent subject of discussion.

I doubt it is more than 10% going the wrong way. Monitor the temperature of the
transformer, for your intermittant duty plasma cutter, I'd not be too worried if the
numbers work out.

Btw, I've seen 440, 460, 480. Looks like 10% variation isn't a big deal.

As far as starting the motor, I bet it works. We use a lot of transformers to step down
480v to 240v to run cnc equipment. I don't think we are padding the KVA requirement too
much.

Fuse the thing and give it a whirl.

Wes


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