>
>For "ordinary" old power transformers:
>
>Is there a rule of thumb to help estimate transformer KVA capacity from the
>iron (or total) weight? If not, why?
>
>Prior to hypersil, weren't most transformers made from similar iron in
>similar configuration? If so, wouldn't capacity be directly related to core
>weight?
>
// This is pretty much true for ordinary E-I core transformers.
However, some were made from higher-Mu core material than ordinary
transformers. More Mu allowed using fewer turns of wire per volt. Fewer
turns needed meant that heavier gauge wire would fit, so current
capability increased. I use one of these transformers. The 24v, 30A
secondary is a layer of copper tape c. 3" in width, sandwiched with a
layer of 3.5" w. plastic tape, wound like a clock-spring. It has
surprisingly (to me) low winding resistance for a transformer of its
weight.
cheers, Jerry
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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