Do not forget when using HV transfomers it´s not uncommon to use larger cores
because of the need of space for isolation
between the winding layers. The higher voltage the more space you need for the
isolation the less size wire fits into the coils.
/Mike SM3JLA
----- Original Message -----
From: 2 <2@vc.net>
To: Jerry Flanders <jflanders2@home.com>; AMPS <amps@contesting.com>
Sent: Saturday, December 15, 2001 3:31 PM
Subject: Re: [AMPS] Transformer Current ratings
>
> >
> >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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