Re: transformer design

To: tesla-at-pupman-dot-com
Subject: Re: transformer design
From: "afa2fg" <afa2fg-at-email.msn-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Fri, 14 May 1999 22:10:57 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Bob,
   I likewise just acquired some neat transformer stuff. I am in the process
of scrapping a VHF television transmitter. It has two seperate power
supplies and there are rather large 3 phase chokes and 3 phase HV
transformers in each. The transformers are rated at 8000 v. I don't know the
current yet. I'll have to check the schematics. I got a lot of really large
capacitors also. Some are so large that you only want to carry them one at a
time. They won't be much use for tesla work, but will be useful for other HV
stuff. Fortunately, the capacitors are marked "non PCB". Even cot a couple
of three phase capacitors. Not much use, but they sure look mean. Am still
taking this monster apart, and finding more neat stuff each day.
   Let me know how your windings go. I would like to rewind one of my 3
phase transformers also.
Good luck
George Stein

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Friday, May 14, 1999 2:55 AM
Subject: transformer design


>Original Poster: bob golding <yubba-at-clara-dot-net>
>
>Hi all,
>
> Went to my favorite scrap yard today and hauled out a 3 phase choke. It is
>marked "3 phase reactor 112 amps 415 volts" When I got it home I quickly
>removed the windings,3 layers of 1/8"x1/4" section cotton covered copper
>wire. This has left me with a core of the following dimensions 10" x10" 3"
>with two windows 6" x 3" x 2". I have looked in the archives and think I
>can work out a design. What worrys me is the permeability of the core as it
>was a choke rather than a transformer,and whether I should interleave the
>laminations or leave them as they are in an E and I configuration and
>suffer the core losses, or try to design them out by increasing the turns
>per volt. If any UK coilers are interested there are 4 or 5 of these in the
>skip. I asked the man to put them on one side for me. They cost me 15 ukp
>each and weigh 40 kilos each. heavy!!If anyone wants to run though the
>numbers I would me grateful.
>
>many thanks
>
>bob golding
>
>