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Re: [TCML] pole pig ballasting



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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