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Re: transformer question

Grayson

The current would not be doubled. Each transformer cannot deliver more than
its short-circuit current (due to the large leakage inductance) and in this
case I reckon the current will actually be halved since each tranny will
only have half the voltage puusing current through the same reactance. The
voltage would be the same. I think therefore it would be pointless apart
from the perspective of making your NST's last longer. The cases would each
have to be floating, of course. It might be possible to add some equalising
resistors to ensure that the cases are at the midpoint voltage of each
secondary (ie a potential divider).

Anyone else care to comment?

Alex




Tesla List wrote:

> Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com>
>
> Are you sure? With both the secondaries AND the primaries in series? I've
> often wondered about that configuration and have never seen any thought
> or questions about it before.
>
> Just to be sure you (and Reinhard!!) get it, I am talking about LEAVING
> THE CASES UNGROUNDED. Just from a hypothetical, and not neccesarily
> practical, point of view. If the primaries are in series, then there
> would be no extra stress on the insulation for the seriesed secondaries,
> as the total volatge would be equal to that of one original transformer.
> ...and the current would be doubled, would it not?
>
> -Grayson
>
> On Wed, 25 Aug 1999 11:38:13 -0600 Tesla List <tesla-at-pupman-dot-com> writes:
> > Original Poster: "The Flavored Coffee Guy" <elgersmad-at-msn-dot-com>
> >
> >
> >
> >     No, it would double the voltage and run at the same current as
> > rated for
> > a single transformer.  Be careful that they are the same make and
> > model, and
> > are classified as isolation transformers.  Outside of the normal
> > safeties,
> > this is one to add to the list, because out phase they are a short.
> >
> >
> > James.
> >
> > -----Original Message-----
> > From: Tesla List <tesla-at-pupman-dot-com>
> > To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
> > Date: Tuesday, August 24, 1999 7:46 AM
> > Subject: Re: transformer question
> >
> >
> > >Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com>
> > >
> > >Yes, it is very possible to parallel them, for 9KV 60ma. Hook both
> > the
> > >secondaries in parallel, amd both the primaries, as well. This
> > means that
> > >each terminal of one NST willl be connected to one of the others'.
> > >Otherwise, I think that one could also wire both the primaries and
> > >secondaries series, for the same effect. That way, each transformer
> > would
> > >be running at half voltage, but would it still double the amperage?
> > I
> > >dunno, so stick with paralleling them.
> > >
> > >
> > >-Grayson Dietrich
> > >"The Electrophile"
> > >www.electrophile.8m-dot-com
> > >
> > >
> > >On Sun, 22 Aug 1999 15:15:28 -0600 Tesla List <tesla-at-pupman-dot-com>
> > writes:
> > >> Original Poster: Matus <matus-at-snet-dot-net>
> > >>
> > >> I have two 9 kilovolt neon sign transformers both rated at 30 ma,
> > is
> > >> it
> > >> possible to hook these up in parrallel to attain twice the
> > amperage
> > >> at 9
> > >> kv?  Is this a simple question of how they are hooked up or is it
> > >> either
> > >> not possible at all or too complicated.
> > >>
> > >> Thanks in advance
> > >>
> > >> Matus
> > >>
> > >>
> > >
> > >___________________________________________________________________
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> > >
> >
> >
> >
> >
>
> ___________________________________________________________________
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