[Amps] The White Smoke Escaped

[R.Measures]

On Aug 28, 2004, at 12:48 AM, Harold B. Mandel wrote:

> Gents,
>
>         Doing a bench test of my new P.W.Dahl custom-wound
> filament transformer with no loads attached the breaker was on
> for under five seconds before the unit burned out.
>
>         A small puff of white smoke, a nasty smell and now
> a fried transformer.  All the connections matched the PWD
> schematic and the voltage was as specified for the primary
> windings. The transformer had dual 120-vac windings that
> jumper together just like the original ALPHA xfmrs so
> 120 or 240 vac service could be selected.
>
>          The unit has already been entered into the FedEx system
> and I wanted to let all of you know of the warranty process and
> to ask for any guesses as to what might have gone wrong, seeing
> that the primary connections were all in-spec (???)

--  Were the dual 120vac windings connected in-phase or out of phase?
>
> Hal Mandel
> KA1XO
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>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org