Re: [TCML] New high voltage source for VTTC

[Liviu Vasiliu <teslina@xxxxxxxxx>]

Dr Resonance

The pole pig xfrms are just a dream for me...Anyway, thanx for the idea.

teslina
>
>


--- On Tue, 2/10/09, DC Cox <resonance@xxxxxxxxxxxx> wrote:

> From: DC Cox <resonance@xxxxxxxxxxxx>
> Subject: Re: [TCML] New high voltage source for VTTC
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Tuesday, February 10, 2009, 12:35 AM
> I unwind pole xmfrs to get down to 5 kV to drive 833Cs.
> 
> You could do the same.  By unwinding the outer sec layer
> you can set your
> voltage to anything you require in the 4 to 14.4 kV range. 
> I use the
> smaller
> 7,200 Volt pole xmfrs as then only 3-4 outer layers have to
> be removed to
> get to the 5 kV ACrms output required.
> 
> I recase them in a steel box 18 x 18 x 17.5 (high) inches
> and then use a
> phenolic top for the 220V input and HV output.  In this
> smaller box the
> weight
> goes from the stock pole xmfr weight of 285 lbs down to 110
> lbs.  Nice
> compact unit that can deliver up to 20 kVA on shorter duty
> cycles.
> 
> Dr. Resonance
> 
> 
> 
> 
> 
> On Sun, Feb 8, 2009 at 9:55 PM, alfred
> <alfred@xxxxxxxxx> wrote:
> 
> > Hi list
> >
> > I am slowly building a new VTTC with a big russian
> tube (GU5B) and I needed
> > a more powerful high voltage transformer to power it.
> Unfortunately I have
> > only small MOTs with different outputs, so it would be
> hard to simply
> > parallel them.
> >
> > So, I designed a powersource, using the MOTs I have in
> hand. The doubler
> > cap will charge at the higher voltage from the biggest
> MOT and the currents
> > will add to another through some unidirectional paths
> (using HV diodes). I
> > tryed the new source with one of my VTTCs and the
> results seem to be
> > satisfactory.
> >
> > The design discussion, drawings, setup pics and movies
> are published here:
> >
> >
> http://4hv.org/e107_plugins/forum/forum_viewtopic.php?60496
> >
> > The suggestion from the forum guys was simply parallel
> the MOTs, because
> > the power dissipation from the leaking current would
> be too small to
> > consider, but I was worry to not loose power (the
> output difference from the
> > MOT secondaries was 92 V at full mains voltage = 220
> V). Another variant was
> > to take off the shunts and modify the number of turns
> in the MOT primaries,
> > but I was too afraid to not damage the xfrms (it is
> hard to get them here).
> > So, maibe I have chosen the complicated way, but still
> it seems to work.
> >
> > teslina
> >
> >
> >
> >
> >
> >
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