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Re: transformer question

to: Alex, Grayson

Potential is doubled, current in series is the same at all points, so
current remains the same.

NST's are only designed to operate above 10 kV for a few seconds at best and
then drop back to a steady 1 kV and operate as a current source to drive the
neon tubes.  If you run them this way in a TC circuit,  which is hard on
them anyway, you best have a good supply of NST's because you will be
blowing them every few times you fire your coil up.

Regards,

Dr. Resonance


-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Saturday, August 28, 1999 8:21 PM
Subject: Re: transformer question


>Original Poster: Alex Crow <user-at-alexcrow.clara-dot-net>
>
>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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