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RE: [TCML] Single ear piglet
Hi Adam,
That?s a really nice drawing and design. I was wondering what would happen
if the HV shorted to a LV turn. This happened via a lightning strike on the
pole outside my house and blew lots of stuff up inside like all the duplex
bridges and tripped every breaker. My MO was toast and my TV fortunately
blew a fuse. Everything else of real value is on a big ass APC. I think it
should be a saved PDF one horners!
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Yurtle Turtle
Sent: Thursday, April 23, 2009 4:11 AM
To: Tesla Coil Mailing List
Subject: RE: [TCML] Single ear piglet
I'm not doing mine exactly like David, but here's what I've been doing for
years:
http://www.classictesla.com/hot-streamer/adam/bigass_coil/schematic.pdf
As to being bad, most folks don't recommend doing this with a NST, though I
have. It does change how most folks do their safety though. You can't have a
three point safety and your case has to float.
I don't get your question about faults. A fault on the HV side is current
limited on the LV side by my ballasts. A fault on the LV side is covered by
fuses (in my 100 amp disconnect) and a breaker (not shown).
Adam
--- On Thu, 4/23/09, Jim Mora <wavetuner@xxxxxxxxx> wrote:
> From: Jim Mora <wavetuner@xxxxxxxxx>
> Subject: RE: [TCML] Single ear piglet
> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> Date: Thursday, April 23, 2009, 1:50 AM
> Hi David,
>
> Let me see if I am following you. This then RF grounds the
> inner turn of the
> primary, Yes? I know others do this and tie it to the
> secondary base. So
> there is no arc over from the inner turn to the coil lower
> turn. I seem to
> remember something bad about this but can't peg it. I
> believe this is the
> hallmark of an Oudin coil construction.
>
> Is this what you are doing? The return has the advantage of
> being RF but
> what is there is a fault in the transformer... the LV goes
> to the operator
> controls... do we trust the RF ground resistance to mains
> to blow a breaker
> or am I missing something?
>
> Jim Mora
>
>
>
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx]
> On Behalf
> Of David Rieben
> Sent: Wednesday, April 22, 2009 4:31 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Single ear piglet
>
> Hi Jim, Gates,
>
> What "I" do with my single eared piggy is hook the
> tank's case "return" to the opposite side of the SG/
> capacitor form the "ear".. In other words, the tank
> case is tied to RF ground. Since my pig is resting on
> a plywood base and fastend via its polemunt brackets
> to 2x4 cross beams inside of my control panel, I am
> able to effectively isolate the RF from the mains ground.
> As a matter of fact, there is no direct connection to
> mains ground at all with the my piggy, since proper
> input hookup leaves the middle LV bushing un-
> grounded.
>
> I see you also mentioned that your transformer's
> rated
> output is 30 kV with 120 volts input. I am assuming
> that this is some type of potential transformer as
> 30 kV seems rather high for typical primary distri-
> bution voltage. Also, as Herr Zapp has mentioned,
> this is also a very high primary voltage for a typical
> Tesla coil circuit and few of even the largest coils run
> on primary circuit voltages of this magnitude. List
> member Scot "bunnykiller" D. is about the only one
> that I can think of off the top of my head that has
> succesfully ran ~ 30 kV in a standard, air-insulated Tesla
> primary circuit and he can tell you firsthand of the
> inherent
> problems with running voltages this high that H. Zapp has
> already mentioned in his posting to this thread. If it's
> at
> all feasble for you, you may wish to consider obtaining
> a pole pig with a more typical input voltage (output
> voltage, for our use), like 13.2 or 14.4 kV. If it's not
> feasable, then I suggest that you talk with "bunnykiller"
> to get some insight from his experience. Of course,
> one advantage to using a higher primary voltage is that
> you can get by with a notably smaller primary capacitor,
> capacitance wise, per E = .5 CV (sqrd), where E is the
> energy, in Joules, C is the capacitance, in Farads, and V
> is the potential, in volts. However, the increased
> dielectric
> requirements for the additional voltage standoff pretty
> well
> render this advantage moot.
>
> David Rieben
>
>
> ----- Original Message -----
> From: "Jim Mora" <wavetuner@xxxxxxxxx>
> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> Sent: Tuesday, April 21, 2009 7:54 PM
> Subject: [TCML] Single ear piglet
>
>
> > Hi Gates,
> >
> >
> >
> > Dr, Resonance does this on all his coils this way. I
> just set one up to
> > his
> > specs and many list member ground one horn in a dual
> horn. I'll let Dr.
> > Resonance advise on this. Generally the inner turn of
> the primary is
> > grounded to the coils RF ground. You need a return
> path so the pig may be
> > at
> > mains ground too, something I don't like much. Filter
> the nasties!.
> >
> >
> >
> > Jim Mora
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
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>
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