[Amps] RE : 3 PHASE TO 1 PHASE REWIND

[Will Matney]

Jos,

You probably could by using the center leg primary only for the input and all the other windings as secondaries. The losses would be higher though in the two outside legs as compared to one wound with both the primary and secondary in the same coil. They do make dual coil transformers though using UI cores which form a square of iron. The primary then is on one leg and the secondary(s) on the other. Some plate transformers are made this way using a single c-core section or with UI lams.

Best,

Will


> 
> Hoy Will,
> 
> Stupid vieuw of mine?
> A 3 phase transformer, isn't there any possibility to use it as is as a
> single phase Will.
> 
> Jos on4kj
> 
> 
> 
> -----Message d'origine-----
> De : amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] De
> la part de Will Matney
> Envoyé : mercredi 29 juin 2005 21:33
> À : amps at contesting.com
> Objet : Re: [Amps] 3 PHASE TO 1 PHASE REWIND
> 
> Doug,
> 
> You can wind it that way but the losses shoot up pretty good. The
> primary would have to be put on the center leg. You may want to just
> wind one big coil and mount it on the center leg (core) as the windows
> are wide in a 3 phase core. That would give the most efficient design.
> Also, the standard transformer equations work the same by how much area
> in sq. inches is in the cores cross section, the type of steel for the
> max. flux density, and the laminate thickness for the stacking factor. A
> 3 phase cores outside legs are the same thickness as the center leg or
> core. The windows are about X2 as wide than in a single phase type core.
> By this a thicker coil can be wound than on a single phase.
> 
> Best,
> 
> Will
> 
> ----- Original Message -----
> From: "Doug Waller" <NX4D at comcast.net>
> To: amps at contesting.com
> Subject: [Amps] 3 PHASE TO 1 PHASE REWIND
> Date: Tue, 28 Jun 2005 15:04:31 -0400
> 
> >
> > Gentlemen:
> >
> > I have the opportunity to obtain a 15kva, 3 phase power 
> > transformer, which I wish to rewind as a single phase HV plate 
> > transformer.
> >
> > I tentatively plan to wind the primary on one core, and two 
> > secondary windings, one on each of the remaining two cores, and 
> > connected in series.
> >
> > Any experiences with such, or any advice would be appreciated.  I 
> > want to rewind one big power transformer in my ham career before 
> > I call it quits.
> >
> > All comments welcome.
> >
> > 73/DX, om Doug / NX4D
> > _______________________________________________
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> > Amps at contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> 
> 
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