[Amps] Amps Digest, Vol 220, Issue 21

[Doug Ronald]

> If you excite the winding on one leg of the core, the flux passes through
all three legs.
That's precisely why the 3rd leg should have its windings shorted - to keep
the flux out of that leg.

> Core saturation will reduce the kVA rating to very roughly, 1/3 of the 3
phase rating.
I doubt core saturation is an issue unless someone is passing DC through the
windings. Most likely these multi-kilowatt transformers were 208 VAC 3-phase
primaries, so if core saturation is your fear on 240 VAC, connect the two
legs' primaries in series. Connect the secondary in either series or
parallel depending on the potential desired. With the secondary in series,
you will have a center tapped transformer perfect for a two diode full-wave
rectifier.
-W6DSR


-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Bob D.
Sent: Wednesday, April 21, 2021 13:37
To: amps at contesting.com
Subject: Re: [Amps] Amps Digest, Vol 220, Issue 21

Aloha Bill,

For single phase, look at flux.
If you excite the winding on one leg of the core, the flux passes through
all three legs.
Core saturation will reduce the kVA rating to very roughly, 1/3 of the 3
phase rating.

73, -Bob


Date: Wed, 21 Apr 2021 07:47:07 +0000

> From: "Fuqua, William L." <wlfuqu00 at uky.edu>
> To: "amps at contesting.com" <amps at contesting.com>
> Subject: [Amps] single phase into 3 phase transformer
> Message-ID:
>         <
> BN7PR03MB4499D73ADD4DC222578C7F44CB479 at BN7PR03MB4499.namprd03.prod.out
> look.com
> >
>
> Content-Type: text/plain; charset="iso-8859-1"
>
> What is the preferred method to wire a 3 phase transformer to operate 
> off of single phase?
> I have heard of several possibilities and happen to have a mess of 
> multi kW three phase HV transformers.
>
> 73
> Bill wa4lav
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
>
--
-do not look into LASER with remaining eye!
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