[Amps] 3 Phase Transformer Expertise Needed

[Steve Thompson]

On Monday 02 June 2003 14:20, David Smith wrote:
> I recently obtained a big 3-phase transformer that could be useful if the
> lights flicker too much with my single phase PSU!  However, I need some
> help in working out what DC voltage and current the transformer will
> produce.
>
> The transformer has a primary with three separate windings coming out to
> binding posts and so I assume that it can be linked either as a star or
> delta configuration.  Currently it's wired as delta.
>
> There appear to be two separate secondaries.  Each secondary has 4
> connections - one winding marked A, B, C & N and the other A1, B1, C1 & N1.
> Resistance measurements indicate that these are probably star configuration
> (i.e. A-B = B-C = A-C = 200 ohms, A-N = B-N = C-N = 100 ohms).  The
> transformer is marked "1550 V RMS per phase, 0.35A RMS per phase".
>
> Can anyone advise what sort of voltage and current I'd get out of this
> transformer if I put a 3-phase bridge on the output of one of the windings?
> What about combining the two windings?  Does anyone know anything about an
> Interphase Inductor or Interphase Transformer configuration for two 3-phase
> windings?
No expertise to offer you, I'm guessing that motor and transformer wiring 
follow similar standards. Try 
http://www.firstelectricmotor.com/motor_connections.htm and look at the 'Dual 
voltage wye 12 leads' picture. It might help.

Steve