RE: Re-configuring X-Ray Transformers

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Talk about lucky; an endless supply of x-ray outfits from a neighbor. A plus
is that you have a knowledgeable neighbor to help with the equipment.

The autotransformer in a control panel can be used as a choke. Its a big
square core with a many tapped coil of thick gauge wire. You should have
about 24 taps. Its used to tap off the correct voltage for the high voltage
transformer from a variety of service lines. The inductance of the
autotransformer also helps to stiffen the input to the high voltage
transformer. Also there are big resistors, contractors, heavy cable, and big
copper bolts

Godfrey Loudner 

  

> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Wednesday, January 30, 2002 1:24 PM
> To:	tesla-at-pupman-dot-com
> Subject:	RE: Re-configuring X-Ray Transformers
> 
> Original poster: "Jack King by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <speakernut-at-yahoo-dot-com>
> 
> 
> --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "Loudner, Godfrey by way of Terry
> > Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>
> > 
> > Hi Jack
> > 
> > There's a heck of a lot of wire in those HV
> > windings, making for much
> > impedance. You would need 100kV impressed on the HV
> > windings to circulate
> > the normal full-load current of 400 mA. The 20,000
> > volts is not enough to
> > overcome the impedance to circulate a current of 2
> > amps. Turns must be
> > removed from the HV windings to lower the impedance.
> 
> That was my original plan: Actually I queried about
> paralelling the two "de-wound" secondaries. Evidently
> theres not enough dielectric around the base of the
> coil stack to have a potential around 15 KV above grd.
> I wanted to paralell in an attempt to compensate for
> the puny wire awg size: 
> 
> ...well that was dashed to heck: Plan b.....just
> de-wind the secondaries and hope I can make her work.
> I guess the wire size will tell all. I need to be able
> to run her at 15-25 kv with about 350-400 ma for about
> 25 seconds or so, then a pause of about 10-30 seconds,
> and then at around 800-900 ma for about 15 seconds.
> then a cool off period of around a minute-3
> minutes.....maybe I should just scroung a
> pig....although I must confess, I kinda fell in love
> with "BERTHA" all dressed up in her big gray
> rectangular tank....all 500 or so pounds of her...lol.
> > 
> > Was it costly to get two x-ray transformers together
> > with their control
> > panels. There are many useful devices in the control
> > panels.
> 
> No, My neighbor owns Simon's X-Ray, so all the
> obsolete stuff will be coming my way, as the scrap
> yards wont give him much for the stuff and uhmm heck
> yeah I can use the consoles (see my original post in
> this thread re my plans for the
> autotransformer.....any thoughts???)
> 
> Thanks,
> 
> Jack
> > 
> > Godfrey Loudner 
> > 
> > > -----Original Message-----
> > > From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> > > Sent:	Tuesday, January 29, 2002 2:09 PM
> > > To:	tesla-at-pupman-dot-com
> > > Subject:	Re: Re-configuring X-Ray Transformers  
> > > 
> > > Original poster: "Jack King by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>"
> > > <speakernut-at-yahoo-dot-com>
> > > 
> > > 
> > > 
> > > > >  but I fear the wire awg size may be a hair
> > > > > too small (pun intended) to sustain even the
> > short
> > > > > term current I need (sometimes around 800 ma -
> > 1
> > > > amp.
> > > > 
> > > > Well, for that much current out, you need big
> > > > current in. So the primary
> > > > could be just as much a
> > > > problem. For 15KV -at- .500 AMPS , using 220 VAC in
> > you
> > > > need 34 AMPS primary
> > > > current.
> > > 
> > > If a transformers specs were say 400 MA -at- 100 KV,
> > is
> > > it not true that I could expect say 2 amps -at- 20
> > KV? Of
> > > course the secondaries wire size would have to be
> > of
> > > substantial gauge to cope with the increased
> > current:
> > > Wouldn't the PRIMARY wire awg size already be
> > > adequate?
> > > 
> > > NeonUT Jack
> > >