Re: Large Transformers and Capacitors

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

The transformers are clearly designed for a very high isolation voltage
between primary and secondary.  These kinds of things are used to provide
power to something that is floating at a high voltage.  4kV output is fairly
high, so the implication is that they were used for some form of vacuum tube
plate voltage, although things like accelerating potential generators for
ion guns, etc. are also a possibility.  It's hard to tell without some
testing (or research into their history) just what isolation they are good
for.  50 kV or more, given what looks like an insulating tube between the
core and the windings.  The conductive tubing is probably for E field
control.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, January 26, 2002 11:54 AM
Subject: Large Transformers and Capacitors


> Original poster: "Andy Cleary by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<cleara-at-twcny.rr-dot-com>
>
> Hello all - I recently came across two rather large transformers, with
> some characteristics unlike any other transformer I've seen.  I was
> hoping I could get some opinions from those on the list. Here goes:
>
> The transformers (which can be seen at
> http://www.rpi.edu/~cleara/hv/2transformers.htm) are somewhat odd
> looking:  They are exposed core, dry type.  First off, anybody know
> what they could possibly be from?  Secondly, What is the reason for
> them to be constructed as they are? I'm guessing just a big air-gap to
> prevent arcing?  Also notice the large plastic insulation between the
> secondary and the core!  And my BIG question:  The High Voltage output
> wire is secured to the coil windings by a wire stemming off either
> side of the main output wire.  Those wires are then each secured into
> the ends of some _conductive_ tubing wrapped around the coils. (notice
> in the pictures the two black rings around the secondary coils, as
> well  as the two black rings around the base of the coils.)  The
> tubing is actually labeled "conductive", so whoever put it there must
> have had an idea behind it (it is actually about ~50k per inch).  If I
> draw an arc from the HV end to the LV end, the tubing pieces start
> arcing together.  Could those rings just be there to prevent the
> arcing that I am trying to force? Any information would be great!
>
> Also, I came across some very large and interesting HV caps.  They are
> rated at 120KVDC, and .15uF.  For anyone interested, I've got some
> pics at http://www.rpi.edu/~cleara/hv/large.htm (watch out, the
> pictures are slow to download!).  Again - any idea as to what they're
> used for?  Thanks,
>
> -Andy C.
>
> --------------------
> Andy Cleary - KC2GVE
> AJAX Electronics
> cleara-at-rpi.edu
> Geek# 1010
> www.rpi.edu/~cleara/
> -------------------
>
>
>