A transformer is a transformer is a transformer and really don't care
which windings are input and which are output as long as the voltage and
current are within the windings ratings. However, if memory serves they
are a bit more efficient if the "high current" windings are closest to
the core.
On 6/11/2010 6:43 AM, Jim Thomson wrote:
> Sent: Fri, June 4, 2010 6:16:26 PM
> Subject: Re: [Amps] backwards plate transformer
>
> I have used pole transformers since 1968, running them backwards so to speak
> as you have decided to do.? As long as you follow the proper voltage and
> current of the original transformer design, you will have no trouble and an
> excellent, very heavy duty power supply.? I am making a major leap of faith,
> I am assuming this is possibly a pole transformer?
>
> I now use a 5 Kw transformer that was original a dual primary, with 7200 VAC
> for the dual primaries each.? Normal primary voltage was 14,400 VAC in our
> area of Wisconsin.? The secondary was set up for 120 VAC/240 VAC.? I pulled
> that puppy out of its can (PCP free) and let it drain for a month or so.? I
> then measured the wire size and found I could easily run it at 1.5 Kw
> output.? So, next I unwound the high voltage windings, layer by layer now
> re-labeled as the secondary, until I got it down to about 2050 VAC output.
> I hooked them in parallel.? With a boost/buck in the primary, I can get 2600
> VDC to 3400 VDC from my current HV supply
>
>
> ## Interesting. Every pole pig I have seen has the HV winding [pri] in the
> middle of the core... and the 240/120 winding on the outside. [step down]
> Which makes it very tough to pull HV windings off... to get the HV down to
> where u want it.
>
> ## On step up xfmr's ..like ham gear... the 240/120 winding [pri] is in the
> middle of the core.. with the
> hv [sec] on the outside.
>
> ## per Rauch... ideally, what ever you are calling the primary.. should be
> at the inner core,
> and the sec on the outer layer. Most pole pig makers will tell you.. that
> you can run em backwards
> with 90% of em at full power.. and only 10% of em at slightly reduced power
> [90% of max].
>
> ## My 4800 vac pole pig has been leeching oil since I bought it back in
> 1979.
>
> Later...Jim VE7RF
>
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