[TCML] X-Ray Transformer Help

[Jim Lux]

On 1/30/12 8:37 AM, Tim Flood wrote:
> Need help on a possible off - topic subject. I now have a
> Picker-Andrex portable x -ray mchine rated at 100Kv at 10 ma. max.
> This unit is like non I've seen before.
>
> The transformer and other components are contained in a 8 1/2" dia. x
> 29" vertical can. There is no oil inside, rather it is pressurized
> with sulfur difluroride gas.


More likely, sulfur hexafluoride (SF6).
http://home.earthlink.net/~jimlux/hv/sf6.htm

you might be able to buy some to replace it. It's fairly expensive 
(about $1000 for a 115lb cylinder... call it $10/lb)
  Lecture bottles hold about half a pound (250g) of liquid, which will 
vaporize quite nicely.

(for what it's worth, sf6 is pretty dense 6g/l, so half a pound is not a 
lot of cubic feet... maybe one or two cubic feet)

Or there are other gases that might work almost as well.


  The actual transformer is at the bottom.
> Connected above are to brick-shaped capacitors. The first is rated at
> .008 uf at 75KVDCW and a second cap 100 KVDCW. There is a D - shaped
> transfomer at the very top, along with a few other components. The
> final output is through a 5000 ohm resistor. All of this is supported
> between two vertical rods.
>
> I would like to use the transformer to supply power for a project,
> but I don't know if I can simply use the transformer alone submersed
> in oil. Or, should I use the assembly as designed? If I can use this
> I'll have questions on ballast, etc.


If you can fill it with a suitable dielectric gas, it will work. Oil 
*might* work, but might not. it will screw up the cooling, and you might 
have voids that the oil won't fill, and the voids will be places where 
the E-field will be high and lead to breakdown.




>
> Thank you in advance for any help. Please feel free to email me off -
> list.
>
> Tim Flood _______________________________________________ Tesla
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>