Re: do i want a wye wye or delta pole pig?

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

Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com> 

Can some1 explain to me just how a 3 phase transformer transformer works?
I've noticed most small ones seem to share a common core, but around here
the power company just mounts 3 pole pigs if you want 3 phase service.

---Eric
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, March 02, 2004 7:18 PM
Subject: Re: do i want a wye wye or delta pole pig?


 > Original poster: Harvey Norris <harvich-at-yahoo-dot-com>
 >
 >
 > --- Tesla list <tesla-at-pupman-dot-com> wrote:
 >  > Original poster: "Crow Leader"
 >  > <tesla-at-lists.symmetric-dot-net>
 >  >
 >  > Unless you have three phase service, that
 >  > transformer is just a 5kVA unit to
 >  > you. Do they have something in 10kVA single phase as
 >  > well? That would be
 >  > more useful, assuming you don't have three phase
 >  > power.
 >  >
 >  > KEN
 > Check out
 > http://www.elec-toolbox-dot-com/usefulinfo/xfmr-3ph.htm
 >
 > Three-Phase Transformer Connections:
 >
 > There are only 4 possible transformer combinations:
 >
 > Delta to Delta - use: industrial applications
 > Delta to Wye - use : most common; commercial and
 > industrial
 > Wye to Delta - use : high voltage transmissions
 > Wye to Wye - use : rare, don't use causes harmonics
 > and balancing problems.
 >
 > I had a 25 dollar deal on a Step down Delta to Wye
 > transformer. Of course to use it as a step -up of
 > voltage, I had to wire it backwards. This is something
 > to consider if we are using our own alternator
 > generated 3 phase emf.  This is because every design
 > to my knowledge uses a internal stator wiring in wye,
 > simply because that combination yeilds the result of
 > outputing a higher stator voltage, where we are then
 > using two (internal)stator coils in series to obtain
 > that WYE output. When we hook that WYE output to the
 > WYE input of the transformer, to procure the Delta
 > step up of voltage, we are then using the 4th
 > combination that causes balance problems. These
 > aspects showed itself as different voltages coming out
 > on the delta outputs, as I recall this may have been
 > on a 1;2;3 ratio, for 100,200 and 300 volt outputs on
 > each of the different phases.
 > HDN
 >
 >
 >