MOT saturation tests II

• To: tesla-at-pupman-dot-com
• Subject: MOT saturation tests II
• From: "Bill the arcstarter" <arcstarter-at-hotmail-dot-com> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Tue, 08 Sep 1998 21:59:47 -0600
• Approved: terryf-at-verinet-dot-com

Coilers,
 While the rest of the world was watching baseball on TV, I was out in 
the garage chiseling the shunts out of my MOT.  I'm now left with the 
main laminations and the primary winding.  The shunts and the secondary 
windings are long gone, having fallen to the chisel!

 I then remeasured the current as a function of voltage.  Here are the 
new results:

(I added the two rightmost columns)

 V=volts, I=amps, Z=complex ohms
  V   Iold  Zold    Inew  Znew
  50  0.26  192.    0.27  185. 
  60  0.31  194.    0.31  193.
  70  0.38  184.    0.38  184.
  80  0.50  100.    0.50  160.
  90  0.73  123.    0.74  121.
 100  1.16   86.2   1.20   83.3
 110  2.14   51.4   2.35   46.8
 120  3.86   31.1   4.41   27.2
 130  5.90   22.0   6.80   19.1

I'm surprised that removing the shunts really didn't do anything to the 
behavior of the transformer!  The main difference is a slightly 
increased current draw at the higher voltages. 

At this point I can only guess that the purpose of the shunts was to 
limit the current flowing into the secondary (just like a NST or 
welder).  It seems that, as far as using MOTs as current limiting 
devices for pigs, the shunts really have little or no effect.

Comments invited!

-Bill

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