Re: [TCML] pole pig ballasting

["garry neeley" <bamacoiler@xxxxxxxxx>]

How did you seperate the E section from the I section.  The transformer I
got for my ballast reactor is about the same size as the one your using.
Bamacoiler

On Wed, Jul 16, 2008 at 1:20 PM, bunnykiller <bunnikillr@xxxxxxx> wrote:

> Hey Garry...
>
> there are several methods of ballasting a piggie, the best I have seen so
> far is to use an EI frame with about 18 -20 sqr inches on the middle column
> for 30A worth of capacity.  Wind about 200- 250 turns of THHN insulated
> solid copper wire on it ( ehhh  # 8-10 should be good). Adjust the gap of
> the E and I portion of the frame untill you achieve 30ish amps draw.  For my
> core it is 1/4" spacer between the E and I sections.  See the picture at
> link below
>
> http://members.cox.net/bunnikillr/Dscf0232.jpg
>
> If you are looking for variable currnet control, a slide choke would be
> more effective.
>
> As far as pushing the limits on a variac, it can be done for a minute or
> two with a cool down period of several minutes. I personally dont like going
> much more than 30% above rating of variac for more than 2 minutes at a
> time....  Ive already smoked a 1256D by pushing it to 45A for about 3
> minutes straight.
> burned the brushes and melted 2 of the windings on it....   repairing it
> wasnt that fun either...
>
> Scot D
>
>
>
> garry neeley wrote:
>
>   Hey guys, I'm in need of a little help.  I've built several coils from
>>
>>
>>> 9kv30ma to 2.2 kva.  I recently aquired a 50kva pole pig and a
>>> 240v/280 out variac @ 30 amps.  I want to use all the power I can but
>>> I dont want to smoke my variac either.  I've been researching
>>> different ballasting methods but I'm still unclear.  ideally I would
>>> like to have 7.2kva out of the pig.  Which brings me to the question,
>>> how could I ballast the pig to only draw 30 amps @240v.  (on a budget)
>>> And how much do you think I could overate the variac meaning safe
>>> levels over 30 amps for short runs if possible at all.  Thanks in
>>> advance.
>>>
>>> Bamacoiler
>>>
>>>
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