Re: Big Transformer eBay

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Jim Lux <jimlux-at-earthlink-dot-net> 

At 07:56 AM 3/4/2004 -0700, you wrote:
>Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com>
>Cost aside, why don't people just wind smaller ones (like 100 lb or so)
>themselves and series or cascade them together, but each one's secondary
>insulated for the total Vout, like with an acrylic bobbin or something?
>Easier to move (6) 20kv ones at ~100lb each as opposed to (1)  120kv,1000lb
>one I would think.


These things aren't made for portability.  If you're spending hundreds of 
thousands of dollars building an X-ray facility, odds are you've got 
construction equipment around that can lift that 1000 pound widget up and 
set it where you need it.

The cascade approach is a popular one for HV testing.  If you want to make, 
say, 500 kV for a test lab, you can get a set of 4 125kV transformers (most 
likely, they'd be fed from a 14kV MV feeder) and hook them up appropriately.

Another example of what you suggest is the classic million volt resonance 
transformer X-ray machines made by Charlton and others, where they stacked 
up 20 or so flat windings on a long core, and drove it at 360Hz.

By the way, insulating something for 100kV is a decidely nontrivial 
process. If "I" had to make something portable, that had to be broken down 
into small packages (<50 lb (OSHA one man lift) each), and that had to put 
out significant power at 100kV or more, I'd be seriously looking at gas 
insulation.