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Registered Member #1438
Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
I acquired a fairly large x-ray transformer but because of it's weight, I was forced to remove all the dielectric oil from the transformer to pull it out of my car (Took two days to get this thing off my car. Eventually had to rent an engine crane to hoist it and now I have several buckets of relatively clean oil and this transformer. Note to self, get a truck and a ramp )
Now I want to replace the transformer back into oil in preferably a smaller container without the rather large filament transformers but I'm at a loss in terms of being able to pull a vacuum on the container (which I have yet to pick) to degass the transformer.
The vacuum pump I have has an ultimate pressure of 1.3 Pa with a pumping speed of 12L/min. (ULVAC SINKUKIKO G-10D)
The transformer is rated at 117kVp at 300mA (TXR 325D). The container required to hold this transformer must be at least 46", 33", 40" which equates to about 60.72 liters minus however much this transformer displaces.
Does anyone have experience degassing large transformers?
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
Dragon I had this same problem with my SEM @ work when a couple of diodes shorted. We built a large tank out of 4' pipe and put the whole shooting match in there. Your vacuum pump is sufficient but it will take awhile. I pumperd for two days to get mine to stop putting bubbles on the oil surface (i did have a 1" view port to see this)
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Nice find there.
Dragon64 wrote ... ...at least 46", 33", 40" which equates to about 60.72 liters
If those dimensions are in centimeters then the volume is what you said.
I think a properly constructed rectangular steel box, styled after the original, could be made strong enough not to collapse under vacuum. That's how large pad-mounted transformer boxes are made. Walls with reinforcing ribs, inside or out, could weigh less than sufficiently thick plain sheets.
With no hands-on experience, I bet engineered box walls deflect visibly under full vacuum. It's not a load that they have to withstand for hundreds of cycles. Could you be bothered to test your original XRT box under modest pressure (+ or - a few psi) and extrapolate whether it could withstand full vacuum without an outer tank as described by John F.?
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Degassing a large oil immersed X-Ray Transformer
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