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Re: [TCML] Pole transformer
This is the method we use for testing Control, Power, Current and Potential
transformers at work. We use an instrument called a TTR (Transformer
Turns Ratio) Test Set, it's about the size of a 5kV HiPot set, runs
on 120VAC. Watch the polarity though, you hook it up backward (normal
powering, 120VAC to low voltage windings), you'll see lots of unintended
colored lights, odors and magic smoke from the TTR... ;^D
Regards
On Fri, Feb 25, 2011 at 12:22 PM, S&JY <youngs@xxxxxxxxx> wrote:
> An alternate and perhaps safer procedure is to run your 120 volt power into
> the HV winding of your pole pig, then measure the voltages of your primary
> windings, separately, then in series, to determine primary pairs and
> phasing.
>
>
>
> --Steve Y.
>
>
>
> _____
>
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Carl Noggle
> Sent: Friday, February 25, 2011 8:33 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Pole transformer
>
>
>
> Hi, Joe,
>
> David is right, I think. You might try energizing the transformer from
> a 6.3V or 5V transformer--or from half the voltage, if it's
> center-tapped--since the step-up is about 50, you should get a few
> hundred volts out of the secondary. If the primaries are connected out
> of phase, you'll get zero. Be careful when you hook up to full power,
> since the 10kV output is not current limited and is LETHAL as hell.
> Beyond that, have fun.
>
> ---Carl
>
>
>
>> 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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--
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA
Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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