I have a number of power transformers I have picked up and am looking
> to use one for a specific application. Most are completely unmarked.
> It is generally easy enough to determine the pinnings through
> continuity and resistance checks, likewise by connecting it to a
> source, the voltages are easily determined. What I am struggling with
> is how to determine the current it is designed or rated for, any > suggestions?
>
> Thanks,
>
> Sean Mathias
If you are able to determine the rated voltage, one method I use to identify the approximate current capability is to supply the transformer with the rated primary voltage, and load the secondary until I get a voltage drop of approximately 5%. I then leave the transformer operating at that load level for an extended period of time checking frequently for over heating. This method isn't fool proof, but has worked for me in every instance so far.
Louis--
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