Hello Dave,
the cross sectional area of the core is 10,8 square inches! So I
thought it is big enough for at least arround 25kVA? It is a big
welding transformer, weights >100kg. Would this really give only 12A @
400Volts? Now I am disappointed ;-(
Stefan
----- Original Message ----- From: "David Speck" <Dave@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, August 18, 2010 10:13 PM
Subject: Re: [TCML] Questions about saturable reactor / magnetic
amplifier
Stephan,
It sounds like you are saturating the core at only 10 amps of DC
control voltage. The 12 amps of 400 volts may be the limit that you
can push through they system.
What is the cross sectional area of the core that you are using?
There is an approximate formula that will tell you how many KVA you
can push through a core based on its cross sectional area.
Dave
On 8/18/2010 1:07 PM, Teslalabor wrote:
Hello,
after several months searching for a suitable transformer for
modification into a saturable reactor, I now have found a big
3-phase welding transformer, which was in use on 3-phase 400V here
in Germany.
For my big teslacoil, which runs on 2-phase 400V, I want to
modificate this transformer into a magnetic amplifier. The goal is,
to control the current through the outer legs of the transformer @
400V from 0-60 Amperes whith a DC current of 20A on the middle leg
of the transformer.
Today I removed the heavy welding windings, and put the two outer
legs of the transformer in series and connected them on 400V. On the
middle core leg of the transformer, I wound a winding of several
turns and applied 20 Amperes DC to it. I measured the 400V - current
trough the outer windings, and it arrised from 0,5A to 10A, when I
regulated the DC from 0 - 20A.
There was something strange to me: The current in the 400V windings
firstly raised very fast when I raised the DC and then only very
smoothly.
I then doubled the windings on the DC winding. I got the 10A in the
400V windings at only 10A (instead of 20A before) but it only
increased to 12A when I pulled the DC to 20A. In the same way:
firstly very rapid current rising, than only 2A from 10A to 20A DC.
Why this? How many thousend turns do I need for reaching 60Amps in
the outer 400V windings? Is it even possible?
Best Regards
Stefan
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla