Re: Transformer Questions

• To: tesla-at-pupman-dot-com
• Subject: Re: Transformer Questions
• From: Mark Finnis <mefinnis-at-medicine.adelaide.edu.au> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Mon, 24 May 1999 17:23:18 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

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 did thid as it was near 
impossible to get anything between the primary and the core.

cheers

mark


Mark

http://www.cobweb-dot-com.au/~dkfinnis

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