NNTP-Posting-Date: Fri, 17 Jan 2003 13:44:52 -0600
Date: Fri, 17 Jan 2003 13:47:53 -0600
From: gary drummond
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Subject: Re: Ferroresonant Transformers
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> "Richard" wrote in message
> > Well, I know what I've got a constant voltage transformer that gives a sine output.
> > The resonant secondary coil and capacitor that is connected to some electronic
> > circuitry, well, I don't know whether I can just forget that, ie just disconnect
> > just have the capacitor in circuit but nothing else. I think constant voltage
> > transformers work okay with just the capacitor.
> > I don't suppose anyone knows of any applicable electronic circuitry that goes with
> > CVT's, and connects to the resonant secondary.
> Actually, it's just dawning on me that this PSU I have is a batterry charger. To
> charge batteries properly you need pretty sophisticated control circuitry and that's
> what's in this PSU, although it's not I don't beleive microprocessor based. So, I
> might possibly be able to use the CVT in a PSU, but disconnect the electronic bits,
> except I need to have the cacitor across that secondary winding.
The only CVTs I ran into were used for a 2000V CW 707KC oscillator
supply, which believe it or not, was the master clock for a computer.
It was the Univac SS-90, which had magnetic amplifiers for logics
elements. It was old, but our customer didn't shut it off until 1976.
The cap/winding was resonant at 60 HZ. a change in frequency on the
power, which by the way is not 60 HZ, it just averages that over a
24 hour period, or an increased loading on the plate circuit would
cause phase changes on the secondary which increased or decreased
the power supply voltage. (Get some graph paper and plot the
vectors... :-) If you remove the Caps, it's a plain old transformer.
Note: When we shut it down, they couldn't sell it, so I grabbed all
the circuitboards, the 4cx-1000A tubes, sockets, and from the
expanded "core" memory (it used a drum memory!) I got the '250s and
power supplies. I made more money on the sockets than the tubes,
but even more on the circuitboards. 100mil gold plating on the