Hi David,
This was an early question I asked when I rejoined the forum. And you
answered in kind. I have completed a three phase diesel Genset recently. So
this Raytheon has been occupying space for awhile. I decided to open it.
I have no interest in smoothing caps, so 3p 6 pulse is the way. This is
certainly a major part of Tesla genius and contribution to us which ignited
the industrial revolution - poly phase motors and distribution systems!
It is a very sad story how Edison, JP Morgan, and Westinghouse screwed him.
This seems to be the way of it here. I have no doubt that our covert
experiments with the ionosphere are related to his papers that were micro
filmed.
Yes, if the frustration reaches a tipping point, I have built a gap to
switch raw AC pig power which is a much more simple solution! I still have
to wind my 12 inch. I want to wind it conventionally with 18 AWG so if
voltage is too high for that it?s a no go as well. I am going to study my
Raytheon Transformer carefully. That will be my go no go point!
Thanks for the heads up.
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of David Rieben
Sent: Wednesday, July 16, 2014 6:04 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] 50:1 "black Box" and Charging inductor(s) design.NOW:
dode design and ground question.
Wow, this is turning into a major project for you, Jim! Unless you're just
really enjoying the challenge of constructing a DC res system from the
ground up, it seems that it sure would be a whole lot simpler to just
incorporate a pig to run ASYNC with raw AC and just hold on to that Raytheon
beast for a nice HVDC supply for charging HV caps or electrostatic
experiments ;^) I mean, if big impressive sparks are really all that you're
after?.... That's the main reason that I never took the step to convert my
Green Monster over to a DC resonant system - gets really complicated with
all of the diodes (+ d'Qing diodes), huge HV filter caps, and multi-Henry'd
choke coils. I'm not trying to be a "wet blanket" for your project, just
saying... Regardless of all that, good luck with your endeavor :^)
David
On Wednesday, July 16, 2014 6:29 AM, Jim Mora <wavetuner@xxxxxxxxx> wrote:
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Bert Hickman
Sent: Tuesday, July 15, 2014 8:08 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] 50:1 "black Box" and Charging inductor(s) design. NOW:
dode design and ground question.
Hi Jim,
There may be a fly in the ointment when trying to use a delta
configuration: can the secondary winding-core insulation system support
a delta connection? Your existing floating wye configuration places
virtually no voltage stress between the floating common connection and
the grounded core. If your transformer was designed to specifically run
ONLY in wye mode, the designers may have skimped on the insulation
between the winding and core. You may have the three-phase equivalent of
three one-eared pigs. You'll need to closely inspect the core-winding
insulation thickness and clearances to see if you can reliably run with
a delta configuration on the secondary side.
*** Yes I had considered that, considering how close they join to the
chassis in the back. I can only try to carefully expose where they come
from....
If you reconfigure to delta and then ground the negative DC rail, the
maximum winding-to-core voltage stress will be the full phase-phase peak
voltage (~13 kV). Whether your transformer can withstand this stress
depends on how your transformer is constructed.
*** copy that**
If you instead let both DC outputs float, the delta-connected secondary
windings will also float, and the voltage across any pair of phases will
be approximately centered on around ground. The maximum winding-core
voltage stress will be about half that for the grounded DC rail case
above. ** interesting!** However, toe better insure balance, you might need
to add HV resistors and three small-value HV capacitors, with one end
connected to the phase output and the other end to the core, to create a
wye-like "soft ground". And, you'll definitely want to add two HV bypass
capacitors (one from each DC rail to your RF ground) to bypass stray RF
currents or accidental streamer hits away from your transformer.
Bert
***Thanks Bert, always a pleasure hearing your wisdom. I have been
temporally called off construction but will advise and maybe take some
pictures of where the floating neutral actually goes... And I am starting an
arduous diode string job at night. I want to protect these if I need to
abandon the Raytheon donor as poor solution.
Jim Mora
Jim Mora wrote:
<snip>
>
> *** I have a question in the diode configuration design stage. My Wye
input
> neutral will see ground as will the transformer / diode tank case of
course.
> Can the negative side of a delta side 6p rectifier also share this ground
or
> do I need a two wire raw DC output? If so, grounded fault currents would
> more likely trigger primary breaker protection, true?
>
> Thanks, and its cool we are on the same kind of track Stephan. Smoke and
> misery enjoys company ;-^)
>
> Jim Mora
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