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Re: 25kVA neon transformer
All:
These Bombarder transformers are just like "pig"
transformers or instrument transformers, no internal
shunts, no internal limiters. The limiter typically
used for a bombarder transformer is external and is
usually inductive, although earlier versions actually
had a movable section of the core that could be
mechanically moved in and out to change the current.
These transformers have to be hefty because they are used
to getter (to burn away if you will) the contaminate gases
within the tube and electrodes. Given that a typical Neon
tube can take 500 to 700 watts under normal operating
conditions, it isn't surprising that they would need many
KW to perform this operation.
Sometimes the tubes fail during the bombard process, and
sparks are likely to fly! I read one article that
recommended putting a jacobs ladder in place of all the
static safety gaps since the safety gap would fail after
a while, but the jacobs ladder would just keep on going.
Earlier pupman archives have several messages about these
xfmrs, there was an extensive thread starting here for the
curious:
http://www.pupman-dot-com/listarchives/1997/june/msg00013.html
ko
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: 25kVA neon transformer
> Date: Wednesday, March 01, 2000 7:02 PM
>
> Original Poster: "Bunnykiller" <bigfoo39-at-idt-dot-net>
>
> Tesla List wrote:
> >
> > Original Poster: "Mark Broker" <broker-at-uwplatt.edu>
> >
> > I never knew NSTs existed above ~1.8kVA (15/120)....
> >
> > Original Poster: "Jon Lagler" <rockcrawl-at-netzero-dot-net>
> >
> > Hi,
> >
> Snipp snipp and another snipp
>
>
> its really not a NST ... its more like a pig ( ummm hog maybe at 90
> amps in)
> it probably has a built in inductive current limiter ( not the typical
> shunt type)
>
>
> Scot D any of you Neon guys know more ? id like to know more:)
>