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Re: [TCML] BPS Testing

In a message dated 3/11/2008 8:53:25 P.M. US Eastern Standard Time,  
bartb@xxxxxxxxxxxxxxxx writes:

>Who  knows, maybe you've got a mismarked NST? Wouldn't that 
>be cool! No  chance, I know. The only reason that thought enters my mind 
>is because  it appears to be just about double what I would expect. Any 
>other  NST's lying around?

I have a Jefferson 15/60 NST that I unpotted.  I removed the outer  
lamination frame
from the straight core part to do a better job of cleaning it up.  The  outer 
frame can be slid off from the straight core, although it's difficult  to do. 
 Then when I 
reassembled it, I was not able to fit every thin lamination back in  place, 
so I left a
few out.  I did not remove any shunts because the only way to remove  them
would be to cut a part off from each lamination.  When  I connected this NST 
my coil, it drew about 3500 VA.  I don't remember if I measured the  wattage
or power factor.  I forget also what type of coil it was.  But in  any case
the unpotting may have increased the power draw in this case.  I  
unfortunately don't
remember how the NST behaved before I unpotted it.  I was probably  feeding
the NST 140 volts.  So the current draw was about 25 amps or  so.   If I 
remember correctly, I was using a static gap.  Maybe just leaving out  a
few laminations might increase the current draw substantially, if the  current
draw did actually increase after unpotting.  Or maybe the unpotting  affected
it by sliding the frame off the straight core.  Maybe the current draw  is 
sensitive to all this.  I don't know.  Something to consider  though.  

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