Re: Three phase transformer arrived for saturation experimentation.

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: tesla <tesla@xxxxxxxxxxxxxxx>

Hi
Ted L in NZ

Beleive your use of a filter on the DC supply is wise to prevent any
accidental Back EMF in the event of rapid disconnection of DC from killing
thinks
Goo li\uck with your experiment
Rgds
Ted l
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, March 09, 2006 7:07 AM
Subject: Three phase transformer arrived for saturation experimentation.


Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hello Aaron, HV grp, and all:

Dimensions of core:
4" wide, 8" high, 9" long, inner I cores 2"

Output: Straight forward Wye configuration touted
to deliver 5KV@1 Amp. All three winding wires to
wye neutral easily accessible. Each winding has a
DC resistance of about 40 ohms. Inductance is
about 13H on a cheapie meter. Guessing 18 AWG stranded

Input:

There are three inner taps labeled 240v feels
like a 10 or 12 AWG gauge wire. On the outter
edge taps are (4) taps/winding these decrease
closely lower R ohm increments beginning at .9 ,
.8, .7,.4 ohms. This getting my Beckman.
Inductance respectfully: .193, .179, .166, .004
hmm. lablels respectively: +10v, 0, -10, 208v .

Let me make some assumptions the inner Hv winding
should be disconnected from neutral and connected
to the DC supply. This consists of a 35 amp 400
PVI Bdiode on a pIII heat sink. For starters I'll
use my 1256d since it is set up anyway. I am
considering using filtration of 400uf separated
by a 23 mh heavy choke 200UF out. Maybe that is
unneeded but there won't be any harmonics or
ripple as the current ramps up. I propose to use
the 240v outer windings to go to my pig, no
neutral. BTW the 208 winding seems heavier.hard to tell.

Ok: those that have suffered through this so far
and know the math, how much voltage/current do
you estimate it will take to Sat this iron? What
do I do with the input windings to the center
control core, and the output winding of the outer
controlled coils. Shorting em will heat things up
fast. Load them maybe? Suggestions are requested.
This may be easier with a three phase really
heavy duty filter choke. I see them on ebay in fact have a few smaller ones.

My pig is grounded as will this transformer. I
have three 4500 watt hot water heaters for
starters. I won't go past 9KW, it would be pity
to smoke this perfect 883a transformer!

Thanks Much,
Jim Mora








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