Re: Power Load Balance Concern

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

Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>

Opps - Jim is right as usual.  This setup will work if you don't use the
neutral connection to the NSTs - just the variac.   Then each NST will get
the same voltage them.
--Steve



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, September 23, 2001 9:32 PM
Subject: Re: Power Load Balance Concern


> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jimlux-at-earthlink-dot-net>
>
> This won't work very well...  One set of NSTs will be running at a
different
> voltage than the other, and since all the outputs are in parallel, this is
> sort of bad news.
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Sunday, September 23, 2001 2:15 PM
> Subject: Re: Power Load Balance Concern
>
>
> > Original poster: "S & J Young by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
> <youngs-at-konnections-dot-net>
> >
> > Matt,
> > Consider using your 4 NSTs with the primaries wired in series-parallel
(2
> > sets of 2 in series, parallel the series sets) and run from 240 V.  You
> can
> > run one leg of the 240 directly to your NSTs and run the other leg
through
> > your variac, using the neutral as the common connection for the NSTs and
> the
> > variac.  Thus your control range will be 120 - 240 volts which ought to
be
> > OK.  This keeps the current below 20 amps.
> >
> > --Steve
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Sunday, September 23, 2001 12:52 PM
> > Subject: Power Load Balance Concern
> >
> >
> > > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <Mddeming-at-aol-dot-com>
> > >
> > > Hi All!
> > >         I am in the process of upgrading my power supply to 4 15/60
NSTs
> > and
> > > already have a 120v input -at-30Amp,  model W30M Variac. Based on
nameplate
> > > ratings, the NST bank  should draw about 33 Amps total (4X8.25). The
> > problem:
> > > since there is only one open slot left in my breaker box, I would like
> to
> > use a
> > > 40Amp breaker, but I have not seen single breakers for this kind of
> > current.
> > > Most are dual breakers -at- 240 V using both sides of the line to keep
the
> > load
> > > balanced and prevent in-house brown-outs.  If I try to get a 4KVA
> > > step-down/isolation transformer so as to utilize both sides of the
line,
> I
> > am
> > > looking at ~$350 plus S&H on 120 lbs.
> > > Questions:
> > > 1. Is running the Variac at +10% a real concern?
> > > 2. Is placing this size load on one side of the panel going to create
> > in-house
> > > imbalance problems?
> > > 3. Anyone got a cheap step-down 4KVA transformer?
> > >
> > > Would appreciate response from any/all with experience in this area.
> > >
> > > Matt D.
> > > G3-1185
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>
>
>