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RE: Transformer build up



John,
Where are you all find so many MOTs?  


Russ Thornton
Sr. Radar Systems Engineer
CSR 2040, 
Building 989, Rm.  A1-N20
Phone: (407) 494-6430 
Email: thorntor-at-rc.pafb.af.mil


> ----------
> From: 	Tesla List[SMTP:tesla-at-pupman-dot-com]
> Sent: 	Wednesday, September 16, 1998 7:37 PM
> To: 	tesla-at-pupman-dot-com
> Subject: 	Re: Transformer build up
> 
> Original Poster: FutureT-at-aol-dot-com 
> 
> In a message dated 98-09-15 21:29:50 EDT, you write:
> 
> <<snip> But it was a pretty powerless spark
> > (light blue in color and not very much current flowing I would guess) .
> All
> > cores STILL have one side of the hv conneced. I am thinking of "CTing"
> the
> > setup (where the 3rd and 4th xformers meet) and earthing this point.
> This
> > should cut down the load the isolation has to carry >> snip
> 
> Reinhard,
> 
> I would definitely center tap the center cores of the secondary array to 
> reduce the voltage stress.  I used a similar center tapped set-up using
> 4 MOT's, and I saw some corona between the core and the primary
> but it held and gave me 64" sparks.  I didn't dunk the transformers in
> oil.  My system drew 6kW using only the current limiting in the MOT's.
> It's hard to predict if, or how long, the insulation will hold out.  You
> have nothing to lose by trying it.  Have you tried searching for old
> plate transformers from old amateur radio equipment or commercial
> transmitting equipment, induction heaters, etc.  These are sometimes
> rated at 3kV to 6kV at 1/2amp or so.  Two could be put in series, and
> center tapped, etc.  Just another possibility.
> 
> John Freau
> 
>