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Re: Transformer Questions

Mark
Checked out your page, a very fine looking instrument, my cores are very
similar except as you noted slightly smaller. Your clamping arrangement
looks like the way to go as mine were originally glued to a plexiglass
framework then just loosely sat in a 15 gallon drum of oil. They had no
means of bolting it to anything. Clamping in an angle iron frame will be
much better for my needs, thanks much for the input. .
Mike
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, May 24, 1999 7:23 PM
Subject: Re: Transformer Questions


> Original Poster: Mark Finnis <mefinnis-at-medicine.adelaide.edu.au>
>
> At 20:22 23/05/99 -0600, Mad Mike wrote:
>
> >I need the advice of a transformer guru. I have recently aquired 4
> >transformer cores which have a short U and a long U with ground surfaces
to
> >mate the two halves together.
>
> ... snip ...
>
> >What would be the best setup for TC use, the
> >primary on one leg and the secondaries on the other or a primary and a
> >secondary on each leg? The transformers will of course be run in
transformer
> >oil, how much wattage could one safely wring out of this design beyond
5000
> >watts?
>
> I am no guru, but these core are very much like the unit I rewound (only
> smaller = 2.75" sq.), see
>
>          http://www.cobweb-dot-com.au/~dkfinnis/tf_rebuild.htm
>
> This unit used dual primaries & secondaries.  When I rewound it I
> centre-taped and earthed the secondaries so the primary-secondary dV was
> minimised ...... I suspect this is a good arrangement.  The only downside
> becomes the outer layers of the secondaries become approximated where dV
is
> maximal.  In fact, run dry I could see the corona between the outer
> secondary insulation.
>
> If the clamps don't hold the cores well enough, note the arrangement used
> on mine, where each C-core is held by angle iron and bolts, then the two
> halves bolted together with threaded rod x 4.  I> impossible to get
anything between the primary and the core.
>
> cheers
>
> mark
>
>
> Mark
>
> http://www.cobweb-dot-com.au/~dkfinnis
>
>
>