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Re: MOTs



     I unwittingly employed the "Jacob's Ladder Test" with a pair of MOTs.  
     The primaries were series-connected, the secondaries were 
     anti-series-connected (dots together).  The ladder consists of 3/8" Cu 
     tubing.  The MOTS generated a bright green arc at the bottom of the 
     ladder, followed by a quickly rising flame-like arc.  After a few such 
     displays, the MOTs began to smoke...profusely.  They didn't appear to 
     be current limited.
     
     However, they were 120V units.  The series connected primaries at 240V 
     might have contributed to this failure.  Would series-connecting the 
     primaries reduce the power factor of the lumped transformer thus 
     created, versus a single MOT?
     
     Aric


______________________________ Reply Separator
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Subject: MOTs
Author:  Tesla List <tesla-at-pupman-dot-com> at Internet
Date:    10/26/98 9:05 PM


Original Poster: Esondrmn-at-aol-dot-com 
     
I salvaged my first microwave oven transformer today.  It is out of a 
Whirlpool microwave, home unit, not commercial but a large oven.  Not sure of 
the rated wattage.  The transformer says made by Korea Transformer Co.  The 
primary wire is .053" in dia. which would be about # 15 or #16 awg.  The 
secondary is about .015" in dia. which would be #26 or #27 awg.  I understand 
I should remove the ground connection from the H.V. secondary to the core and 
isolate it for use.  What do I do with the filament transformer windings 
located between the primary and secondary?  Just cut the ends off and forget 
about it?  I don't see how I could get it apart to get them out, the core is 
welded together.
     
The core is an E core measuring 3.25" high, 2.18" wide and 3.75" long.  It 
weighs a little over 8 lbs.  I can't see any shunts in the core but they
could 
be there.  What would the MOT experts out there expect this transformer to be 
rated at?  How do you find out if it is shunted - try the jacobs ladder test 
and see if the lights go out?
     
Ed Sonderman