Hey guys,
I am definitely bummed that I couldn't make it to Roger's thon this year
and meet some new people. Hope you all had a great time and if there are
pictures compiled I would love to see them!
The reason for this message is because I am interested in building a
larger, pig driven coil and wanted to know if there is a good pole pig
tutorial out there. I currently have a 2 kW NST driven coil using an RSG. I
had a special 220 V, 50 A service outlet put in for just this purpose. Any
good resources that you can point me to would be most appreciated! Thanks a
lot!
Jeremy Gassmann
On Fri, Aug 12, 2016 at 3:43 PM David Rieben <drieben@xxxxxxx> wrote:
> Hi Don,
>
> Yes, I am aware that the utility primary line power factor capacitors do
> indeed have internal bleeder resistors to bleed off the potentially lethal
> charge that they would retain when removed from the live primary line.
> However, this would have little to any effect upon my system when she's
> energized.
>
> Thanks for the heads-up, though,
> Daivd
>
> ----- Original Message -----
> From: "Donald Murray" <don@xxxxxxxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Thursday, August 11, 2016 5:33 PM
> Subject: Re: [TCML] DC Resonant Coil Questions
>
>
> > David,
> >
> > I haven't posted in a long time, but I still read the list. I wanted to
> > let you know that your power line capacitor is going to have an internal
> > bleed down resistor .
> >
> > Don Murray
> >
> >
> > On 8/10/2016 5:45 AM, David Rieben wrote:
> >> Hi all,
> >>
> >> I (along with my daughter and her husband) had a chance to visit Roger
> >> Smith (in Ohio) and get the personalized grand tour of his nice sized
> >> pole barn high voltage lab this past Saturday, August 6. Of course, the
> >> highlight of the visit was his huge, pole pig powered DC resonant Tesla
> >> coil! Of course looking at Roger's DC res setup got the wheels to
> turning
> >> in my head about how I could possibly convert my Green Monster to run DC
> >> res instead of asynch with raw and unfiltered AC strait from my pole
> pig.
> >>
> >> My "junkbox" collection of parts has rendered enough for me to throw
> >> together a DC resonant setup without spending a fortune on new stuff,
> >> with numerous HV rectifier, a storage cap and a 5 H choke. I had a
> number
> >> of HV diodes pulled from x-ray transformers, including (8) of those 6"
> >> long x 5/8" dia. cylindrical, fuse styled ones, as opposed to the more
> >> common diode "sticks". I am using all 8 of these fused styled diodes for
> >> the FWB for the raw AC output from my 14.4 kV pole transformer, as this
> >> type of x-ray tranny diode seems more rob8ust than their stick style
> >> counterparts. With their 100 kVp+ rating, there should be plenty of
> >> overhead as far as potential goes, and I have paralleled 2 at each of
> the
> >> (4) diode positions of the FWB rectifier to beef up the current rating.
> >>
> >> I am currently using (8) paralleled of the more typical diode "sticks"
> >> from an x-ray transformer for the D-Q-ing diodes between the choke and
> >> the Tesla coil circuit's input and they still tend to warm up pretty
> >> quickly in inital power up of the circuit, where the DC output is simply
> >> shorted through the 5 H inductive choke to look for the visible spark.
> Of
> >> course, with their 150 kVp rating, operational circuit voltage levels
> are
> >> not likely to be an issue, but current certainly can be! I figure that
> >> the .1 uFd tank capacitor of my Tesla coil circuit, firing at ~350 BPS
> >> will also load the output of my DC res in a similar fashion, but
> >> hopefully to a somewhat less extent that dead shorting the output of the
> >> DC res circuit through the 5 H choke.
> >>
> >> I have a 5 Henry, 1.25 amp DC rated choke that was originally used for
> >> the output of a 2200 volt plate transformer that I was going to use for
> >> the choke. I do have some concerns as to its insulational standoff
> >> integrity for the ~15 kV voltage levels that my circuit will employ,
> but
> >> it seems to hold up ok in inital full potential testing of the circuit
> by
> >> running my pole pig all the way up to 16.8 kV by imputting 280 volts
> into
> >> its primary.
> >>
> >> I am using a utility primary line power factor capacitor for the storage
> >> cap that is rated for 7960 line voltage, 150 KVAR, at 60 hz. Its
> measured
> >> capacitance is about 6.5 uFd. These caps seems nearly bullet proof, even
> >> at DC voltages of several times their AC line voltage rating and this
> one
> >> is also rated at 95 kV biL (basic impulse level), so I feel as though
> >> this capacitor will serve my purpose.
> >>
> >> Anywho, I have slapped all of the above mentioned components on a 15 x
> 20
> >> polyethylene cutting board - ($9 @ Sam's Club - and besides picking up
> >> some extra 1/4" bolts and nut hardware, that's all that I have spent out
> >> of pocket upon this endeavor so far), - tested them at the full voltage
> >> from one of my spare 14.4 kV pole pigs and I have reviewed Richie
> >> Burnett's website on DC resonant circuits for driving Tesla coils and my
> >> setup seems to be at least a start in the right direction. Of course,
> the
> >> real test will be when I actually try firing my coil through the newly
> >> assmbled DC res. circuit.
> >>
> >> Any input (as to any possible fatal flaws in my design) from you more
> >> experienced DC res coilers would be most appreciated. ;^)
> >>
> >> Thanks,
> >> David
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
>
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>
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