Re: [TCML] New high voltage source for VTTC

[DC Cox <resonance@xxxxxxxxxxxx>]

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
>
>
>
>
>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla