RE: 60 HZ single phase from 3 phase generator to drive an single phase HV transformer

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hello DWP, et al,

The genhead is a Stamford Newage wired 277/480 WYE. I have a 480v Delta-
208/120 wye transformer. I would like to use this transformer and connect
the grounded generator wye tap to the transformer secondary wye tap. It has
been suggested I can do this. Do you concur?

The generator is conservatively rated at 15KW 18.7KVAR 24/7 operation and is
direct coupled to an Isuzu 80Hp C240 diesel prime mover. I realize I can run
208v from the step down but it would be only utilizing 2/3 of the genhead as
I see it, am I correct this would be an unbalanced condition?

Thanks, Jim Mora

I have another single phase generator that maybe I'll just mount on the
trailer. It is a cheapie 10KVA 240v 3600 rp/m stand alone dual belt coupled
generator to a former Kubota diesel lawn tractor engine which I geared up
some to stay in its torque range. It would be no great loss to loose the
genhead but it is my backup power in case of a large California Earth Quake.

I just found a serious military generator trailer, which should handle ALL
my heavy stuff. The deck is 1/4 steel plate 7x10 foot and is rated to
7600lbs!

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Thursday, May 03, 2007 6:01 PM
To: tesla@xxxxxxxxxx
Subject: Re: 60 HZ single phase from 3 phase generator to drive an single
phase HV transformer

Original poster: "Dave Pierson" <davep@xxxxxxxx>

On Mon, 30 Apr 2007 23:17:26 -0600
  "Tesla list" <tesla@xxxxxxxxxx> wrote:
 >Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
 >
 >Hello Group,
 >
 >For our IGBT engineering types: I would like to have both three phase
 > and single phase from my 3 phase only 480v generator on my Tesla
demo trailer.
    Any three phase source can supply modest amounts of single phase.
    It would be ehlpful for (or other commentators...) to know more about
the
    existing supply:
     Delta?
     Wye?
     Neutral available?
     Manual spec, if any, for unbalanced loads?
     Is there any 'sprare' KVA available?
     Will the single and three phase be used at the same time?

    Ferinstance:
     If delta wired, I'd get a transformer, of appropriate KVA
     for load, arrange breakers to connect it 'line to line' to the
     460 v Alternator.

    Grounding, especially with Tesla Gear may take some thought.

    Sure, could build an inverter, but the above seems simpler.

     best
      dwp