Re: Cap-driven x-former?

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

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

It's not ferro-resonant.. just an ordinary transformer with a lot of leakage
reactance to limit the current in a gas-discharge tube application.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, June 06, 2004 7:21 PM
Subject: Re: Cap-driven x-former?


 > Original poster: "Jim Mitchell" <Electrontube-at-sbcglobal-dot-net>
 >
 > Hi,
 >
 > I believe that capacitor is part of the Ferro-Resonant circuit commonly
used
 > in iron cored transformers.  Google can tell you more then I can.
 >
 > Regards - Jim Mitchell
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Sunday, June 06, 2004 7:49 PM
 > Subject: Cap-driven x-former?
 >
 >
 >  > Original poster: FIFTYGUY-at-aol-dot-com
 >  >
 >  > Folks-
 >  >
 >  >      I bought a HV transformer many years ago (from Mouser, probably)
that
 > has
 >  > a unique feature that I have never figured out.
 >  >      It's a 5KV, 300mA secondary, 110V primary. Single phase, no
windings
 >  > connected to ground at all. From my recent TC research, I learned that
 > this
 >  > X-former also has magnetic shunts (which have since resisted all my
 >  > attempts to
 >  > remove them without destroying the unit). Makes a pretty impressive
 > Jacob's
 >  > Ladder
 >  > driver with the high, but self-limited current.
 >  >      What has puzzled me is why it has a third winding that requires
the
 > use
 >  > of a cap to make the transformer run. The third winding is center
tapped,
 > and
 >  > it's inside (wound closer to the core) of the secondary. The center tap
is
 > not
 >  > used, but the seller's ad mentioned the cap requirement, and they
included
 > a
 >  > cap and a connection drawing.
 >  >      With the cap, it's works great. Without, the HV leads barely put
out
 > any
 >  > spark. How does this thing work, and can this "extra winding with cap"
 >  > principle be applied to other existing HV transformers as well?
 >  >      More specs: Seller advertised it as out of a copier power supply.
 > Inked
 >  > on the side of the unit is "General Electric part # 9T68Y5022G10". Made
 > for
 >  > Eastman Kodak (with an Eastman Kodak part #).
 >  >      Cap is a 10uF 1000VDC oil-filled type.
 >  >
 >  > -Phil LaBudde
 >  >
 >  >
 >  >
 >  >
 >  >
 >
 >