Re: using an SS White x-ray transformer

• To: tesla-at-pupman-dot-com
• Subject: Re: using an SS White x-ray transformer
• From: Terry Greene <xray-at-cstel-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 19 Aug 1999 23:29:51 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Ah, x-ray,... my domain. I specialize in diagnostic x-ray equipment. I
am an EE and own an x-ray service and supply company. I have worked in
field service and as a service manager for an x-ray company.  Decided to
trade up for my own gig.  Reply laced below.

> Here's my problem: The transformer was operated in transformer oil
originally 
> (which had been drained out) and I've been told it is very difficult to 
> remove all of the air and moisture from the tyranny upon refilling without a 
> vacuum pump and jar.  

That's all good and well in theory. All the manufacturers recommend
such. In reality, it's not a problem at all. I do it all the time. So do
all the other x-ray service engineers. Just fill it and let it set for a
couple of days. Bump it with a rubber mallet a couple of times a day.
You won't have any problems. I've rarely seen an x-ray service engineer
go to the trouble to vacuum a tank down. I just isn't necessary.

> Since I don't care to invest in the expensive equipment required for the
job, 

If you really wanted to go to the hassle, which I wouldn't, you could
pull the pump out of an old fridge. Solder a fitting to the inlet side.
It will pull way more than you need and will come close to a commercial
A/C evacuation pump. My scavenged fridge pump does about 29 ". A
commercial unit will do about 31-32". Let me know if you want further
details. Very useful for A/C and lasers, but not worth the trouble
here.  

> I'm wondering if I can operate this transformer at one half of its output 
> (50Kv, 3 mA) either dry or just filling with mineral/ transformer oil (or 
> even kerosene) without vacuuming? 

NEVER DRY!!!!... EVER!
I wouldn't use ANYTHING but Shell Diala-X. There are additives in fuels
and lubricating oils that substantially reduce the dielectric strength
of the oil. Diala-X is available at most oil distributors. Not very
expensive. Look in the Yellow pages. If you can't find any local, let me
know. I get it all the time. 

> It was difficult to obtain this 
> transformer 

I've got a few in the warehouse that are rated at 150KV -at- a full AMP.
Talk about a brown out. :-)  

Let me know if you have any questions,
Terry

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