In a message dated 7/16/08 3:11:02 P.M. Eastern Daylight Time,
bunnikillr@xxxxxxx writes:
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
I made my ballast by cutting up a 3-phase 25kVA drive isolation
transformer for the metal. I made the core dimensions 3 inches by 3.5 inches. That's
10.5 square inches. My ballast core stays cool, even during 60A runs. The
windings get a little warm, but I went cheap and used four parallel windings of
12ga THHN.
My point is, 20 square inches seems like a lot of overkill for only a
30A ballast. You shouldn't need that much iron! Even if you used mild steel, it
has a low permeability but it takes a lot to saturate it.
-Phil LaBudde
Center for the Advanced Study of Ballistic Improbabilities
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