[Milsurplus] Mil surplus transformer current rating question.

[J Forster]

There is a rough rule of thumb of 60 Watts per pound of iron for 60 Hz
transformers. Weigh the thing, subtract what you'd guess the case and
potting (if any) weighs. Roughly figure the iron weighs 2/3, the winding
1/3. Then compute the Watts of the known outputs. What's left is the HV
winding.

That'll give you a rough number.

FWIW,
-John



John Hutchins wrote:

> Group -
>
> If you happen to recall Please help identify this transformer plate
> current rating?
>
> Not sure what the current rating of the plate windings are due to the
> paint being scratched off.
> Reed Transformer Co inc.
> Brooklyn New York
> #20661
>
> 1        2         3       4
> 0V   110V   115V  125V
>
> 5         6         7      8       9
> 0V  26.5V  230V   0V  230V
> @.25A         @????? 30mA ????? <-
>
> 10   11     12    13
> 0V 6.3V    0V  6.3V
> @.75A       @1.5A
>
> Is there a method using instrument measurements that a transformers
> windings can be estimated?
> I can measure the voltage, I can measure the resistance, I can measure
> inductance of the winding in question
> Is there a web page?
>
> Thanks
> Hutch
>
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