Re: Self-built power transformer

To: tesla-at-pupman-dot-com
Subject: Re: Self-built power transformer
From: Doug Brunner <dabrunner-at-earthlink-dot-net> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Wed, 30 Sep 1998 18:42:21 -0600
Approved: terryf-at-verinet-dot-com

It's according to the ratio of turns, not the ratio of turns squared. So, if
I had a xfmr with 10 turns on the primary and 1000 on the secondary, and I
put 120VAC in, I'd get 12000VAC out. The ratio here is 10:1000, or 1:100. We
call it the ratio of turns transformation.

Tesla List wrote:

> Original Poster: Mark E Finnis <mefinnis-at-medicine.adelaide.edu.au>
>
> At 16:03 29/09/98 -0600, Reinhard wrote:
>
> >Here are some values I will build my xformer with:
> >
> >Input: 240V-at-50Hz
> >Output: 15000V-at-500mA (7.5KVA)
> >Primary: 124 turns of AWG 13 (middle leg)
> >Secondary: 7792 turns of AWG 24
> >(This is total, I would ct it, so I would need 3896 turns per outer leg)
> >Crosssectional area of the biggest leg: 2.87 inch^2
>
> Confused through my lack of theory ........ AGAIN :-(
>
> I seem to recall in the previous 'home-made transformer' thread, that
> voltage step-up/down was related to the ratio of (turns^2).  The above
> appears to be calculated on ratio turns.
>
> Help from the 'learned ones' requested ;-)
>
> Cheers,
>
> _________________________________________________
> Mark Finnis
> Staff Specialist, Intensive Care Unit
> Royal Adelaide Hospital
> http://www.health.adelaide.edu.au/icu
> Ph:  +61 8 82224000   Mbl:  041 2324268
> _________________________________________________

--
           --Doug Brunner
                <dabrunner-at-earthlink-dot-net>