Re: [TCML] pole pig ballasting

[FIFTYGUY@xxxxxxx]

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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