NNTP-Posting-Date: Fri, 17 Jan 2003 14:06:16 -0600
Date: Fri, 17 Jan 2003 14:09:15 -0600
From: gary drummond
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Subject: Re: Ferroresonant Transformers
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gary drummond wrote:
> Richard wrote:
> > "Richard" wrote in message
> > news:b01opv$kcgg9$1@ID-150848.news.dfncis.de...
> > > 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
> > and
> > > 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
Sorry about that, ~1 mill, 995u...