[Amps] backwards plate transformer

[Jim Thomson]

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