Re: Large Saturable reactor out of its cage. (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Tue, 24 Oct 2006 09:26:01 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Large Saturable reactor out of its cage. (fwd)

Another great benefit for coils of 5-6 kVA and above is ---- it can 
eliminate the expensive variacs completely!

You use a non-saturable airk-gapped power reactor in series with the pole 
xmfr primary.  By adjusting the DC current thru the center leg of the 
reactor you can start with no current flowing at all, and then gradually 
bring the power up to the level you requires.  It works great!   We seldom 
use variacs anymore, just non-saturable air-gapped power reactors with a DC 
leg.

On straight core reactor design, we use a longer core and put one DC winding 
on each end of the stee; core.   This also works although not quite as good 
as using a center leg to do the control function.

We use a simple SCR control circuit to vary the power level in the reactor 
by controlling the DC current in each end winding.

Dr. Resonance

>
> Hi All, I thought some of you may like a look at a 20KVA 480Vac Reactor 
> for
> high current control.