RE: [TCML] Pole transformer

["Joe Korick" <joekorick@xxxxxxxxxxx>]

Thanks for the info.
You have confirmed my original thoughts.
Joe 

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of David Rieben
Sent: Friday, February 25, 2011 6:36 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Pole transformer

Hi Joe,

A typical pole transformer normally has 4 LV copper straps - one for each of
the "hot" 120 volt-to-ground taps (this would be the 2 outer LV bushings on
the tank's exterior), and 2 that connect to the center tap ground (both
connected to the middle LV bushing on the tank's exterior).
This allows the LV windings to be either seriesed (for a 240 volt output-
the standard arrangement) or paralleled for a 120 volt output. If the 2
ground straps are not connected to each other, as they would both be
connected to the center LV bushing of the external tank, then there would be
no continuity between the outer "hot" straps.
Assuming that the 2 smaller straps are the terminations for the LV center
tap ground and that the larger straps are the terminations for each of the
(2) 120 volt "hot" outputs, this would explain your continuity findings. Try
shorting the 2 smaller straps together and then check the 2 larger straps
for continuity. If this checks out you should permenantly short them
together before installing them into your enclosure.

Also, the 2 smaller wires on the opposite side of the transformer are most
likely the HV leads.

David Rieben




----- Original Message -----
From: "Joe Korick" <joekorick@xxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, February 24, 2011 7:16 PM
Subject: [TCML] Pole transformer


>I recently acquired a 10KVA pole transformer that has been removed from its
> case.
> My plans are to build a suitable enclosure and fill it with oil to immerse
> the transformer.
> My question has to do with the wiring of the transformer.
> It has 6 connection points.
> 4  copper straps, 2 large and 2 smaller on one side of the transformer.
> 2  smaller wire on the opposite side.
> Measuring the resistance, I have continuity from 1 large strap to one of 
> the
> smaller straps
> Same with the opposite set of straps. No continuity from the large straps 
> to
> each other.
> The smaller wires on the opposite side I assume are the high voltage
> windings and I measure resistance across them.
> This is a 220 v transformer with 2 high voltage outputs 12 KV.
> Can anyone explain the low side wiring to me with the copper straps
>
> Joe
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
> 

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