Re: Finished with Isolation Transformer.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Richard W. by way of Terry Fritz <teslalist-at-qwest-dot-net>" <potluck-at-xmission-dot-com>

Hi,
I'll have to borrow my friends camera again.

Measured primary to secondary capacitance = 210pF
Measured secondary to secondary capacitance = 130pF

And just for the heck of it...
Measured primary to core capacitance = 1.72nF
Measured  secondary to core capacitance = 255pF

The polypropylene sheet was heated then preformed to shape.
The curves are quite exaggerated. I'm no artist. :)
ftp://ftp.xmission-dot-com/pub/users/p/potluck/pics/preform.jpg

The primary is wound on the center leg and the secondaries are wound on the
outer legs. I suppose that helps keep capacitance to a  minimum.

Rick W
SLC


----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, February 25, 2003 10:54 AM
Subject: Re: Finished with Isolation Transformer.


 > Original poster: "Black Moon by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<black_moons-at-hotmail-dot-com>
 >
 >
 > Very, pic does not do it justace! you need like.. more pics of it.. I love
 > the clear case and clear oil and that wonderful wrapping job. Have you
 > looked at primary to secondary capasatance and secondary to secondary
 > capasatance?
 >
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Re: Finished with Isolation Transformer. Date: Mon, 24 Feb 2003
 > >17:39:34 -0700
 > >
 > >Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
 > >
 > >Hi Richard,
 > >
 > >WOW!  That is a beautiful thing!!
 > >
 > >Just curious how you sealed the thick Lexan(?) sheets?  Silcone sealent?
 > >
 > >How thick are the sheets that make up the case?
 > >
 > >Cheers,
 > >
 > >         Terry
 > >
 > >
 > >At 09:39 PM 2/23/2003 -0700, you wrote:
 > >>Hi all,
 > >>
 > >>Finally finished the isolation transformer I've been working on.
 > >>
 > >>Specs:
 > >>
 > >>All wire #10 magnet wire
 > >>Transformer is under oil
 > >>
 > >>6.2 KVA -at- 240 vac input
 > >>7.28 KVA -at- 280 vac input
 > >>
 > >>Three primaries -at- 240-280 vac
 > >>Four secondary pairs ... Each pair = two 60-70 vac coils -at- 13 amps
 > >>
 > >>Isolation:
 > >>Secondary to core and secondary to primary insulation:
 > >>2 sheets 1/16" polypropylene sheet from McMaster Carr
 > >>40 KVDC (calculated to 75KV at 600v per mil for the polypropylene used)
 > >>
 > >>Core cross-section = 6.25 x 2.25 (14.0 sq in)
 > >>
 > >>Tested with 23.4 amp load powering a kitchen oven. After 1/2 hour the
 > >>containment temperature was slightly over room temp.
 > >>
 > >>
 > >>Will be used to power a MOT bank.
 > >>
 > >>
 >
 >><ftp://ftp.xmission-dot-com/pub/users/p/potluck/pics/Isolation2.JPG>ftp://ftp.
xmission-dot-com/pub/users/p/potluck/pics/Isolation2.JPG
 > >>
 > >>
 > >>Rick W.
 > >>Salt Lake City
 > >>
 >
 >
 >