small valves and RE: OT

[Patrick Finnegan]

On Thursday 28 April 2005 17:42, Tony Duell wrote:
> > On Thursday 28 April 2005 11:46, Wai-Sun Chia wrote:
> > > On 4/28/05, Patrick Finnegan <pat at computer-refuge.org> wrote:
> > > > Heh.  About a year and a half ago, I pulled the transformer out
> > > > of an NMI power supply.  4kV at 1.5A rating.
> > > >
> > > > That sucker could blow fuses really well. ;)
> > >
> > > Holy moley!! I can imagine... :-)
> > > Could you please post some pics of this monster? I haven't seen
> > > one rated this much before...
> >
> > Unfortunately, I don't have a picture of it, and I got rid of it a
> > while ago when moving offices.  It was a black cube roughly 8" on a
> > side, and weighed in at 80lbs or so.
>
> Soudns rather small to me. 4kV at 1.5A is 6kVA (!). That means it's
> going to draw nearly 60A from a 110V supply. Are you sure that's the
> rating?

It could be a bit larger than that, but I remember that it was possible 
for me to carry it, so it couldn't have been much more than 100lbs at 
most.  I vividly remember the rating of 4kV at 1.5A.  It originally had 
a nice 30A Variac sitting in front of it to change its output voltage.

It could have been up to about 12" on a side.  It's been a while since 
I've had it.

Also, I'm pretty sure it wasn't designed for 100% duty cycle for its 
application (NM imaging), so it's likely that they used under-sized 
condutors.

IIRC, it was supposed to run off of a 208 or 240V input, not off of 
110V, as well.  So, we're down to 25-30A input. :)

Pat
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