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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
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