Re: [TCML] pig Jacobs vrs x-ray transformer

["David Rieben" <drieben@xxxxxxxxxxx>]

Hi Jim,

X-ray transformers make for excellent JLs! A 150 kV unit
will self start at more like a 12" gap than a 2" one, though ;^)
The arc won't be quite as bright as from a 14.4 kV pig be-
cause with the voltage that much higher the current will con-
sequently be lower at a given power input. Still, with proper
ballasting that will allow for a generous portion of power feed,
an x-ray tranny will make for a very impressive JL display and,
as stated above, the much higher voltage makes for very
easy self starting of the arc. Of course the very high voltage
also requires some extra caution since it will have more of a
tendancy to "reach out and touch you" ;^O

David Rieben

----- Original Message ----- 
From: "Jim Mora" <jmora@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Tuesday, November 27, 2007 10:15 PM
Subject: RE: [TCML] pig Jacobs vrs x-ray transformer


> Hello,
>
> Since we are on the topic of high power JL's I used to drive a pretty good
> flamer with a 14400v pig @ ~ 12KVA. I have a big 240v/150KV x-ray
> transformer that I am converting for this purpose (ac out). I will be
> limited to the same power level, at my house anyway. I believe the arc
> should start at about a 2" gap, but would anyone like to speculate how the
> JL will perform at a similar power levels or have practical experience 
> with
> a similar setup?
>
> Thanks,
> Jim Mora
>
>
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Barton B. Anderson
> Sent: Tuesday, November 27, 2007 5:24 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] pig Jacobs
>
> Yes. Likely a nichrome element. But regardless of probability I like to
> swing to the side of safety for more reasons than just the element.
>
> Take care,
> Bart
>
> Mddeming@xxxxxxx wrote:
> > In a message dated 11/26/07 11:29:50 P.M. Eastern Standard Time,
> > bartb@xxxxxxxxxxxxxxxx writes:
> >
> > Hi  David,
> >
> > Well, 50A is pretty high for a simple jacobs ladder. Putting the  element
> > in a cool bath is a good idea. The pig isn't what will fry. In the  worst
> > case scenario, the element will fail and remove the primary limiting
> > device. In that case, the only limiting is the arc impedance itself. You
> > would recognize this by a big change in the arc (brighter, hotter,
> > faster). The breaker may not trip, so if you recognize any change, shut
> > down the pig yourself.
> >
> > Take care,
> > Bart
> >
> >
> > Hi Bart,
> >
> > Aren't high power resistive elements usually high-R wire, possibly on
> > ceramic form, and therefore fail open rather than short out?
> >
> > Matt D.
> >
> >
> >
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