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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
>
>