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Re: Cap-driven x-former?

Original poster: robert heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

The transformer sounds like a constant voltage transformer used to supply
radio transmitters and similar applications where semi-pre regulation is
neaded to supply a changing load such as teletype.
     Robert   H

 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Sun, 06 Jun 2004 17:49:55 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Cap-driven x-former?
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Sun, 6 Jun 2004 17:56:19 -0600
 > 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