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Re: pole pigs - they're great but why didn't ypu protect...
Tesla List wrote:
Ok, David,
I like big xfrmrs too - I have a way over-heavy
duty capable 1-kva USNavy Surplus 5 kvac SP
115 VAC iinput transformer - Stretch Out two
coat hangers, try a Jacob's latter...and a white
arc burning iron results - But tell me, why didn't
you protect your NST w/ a series RFC on the HV
terminal and a Shut (between load and RFC) RF
Capacitor to carry the RF?! That way you'd have
attenuated your XFRMR's HVRF Insult! If it is
a two HV terminal NST, two RFC's and one Cap
can be used, otherwise the Cap could short the
HV RF to GND. Better make sure XFMR-RFC-
-CAP is nonresonant at 60 Hz, BTW.
Gary http://members.home-dot-net/swimp/
> Original Poster: Tesla729-at-cs-dot-com
>
> Hey guys, my name is David and I am relatively new to this internet
thing, but
> I would like to enter some of my thoughts concerning pole pigs for Tesla sys-
> tems.
>
> First, I would like to say that when it comes to power transformers for Tesla
> systems, the pole pig is the ultimate powser supply for serious high powered
> Tesla coil systems. For years I wasted many-a-dollar on OBITs, NSTs, and
> even custom built xfmrs but they always seemed to finally succumb to the vi-
> cious RF kickbacks from the primary tank circuit. And when I considered the
> cost of new NSTs, I just figured that a pole pig would be way out of my
> budget,
> if it was proportionately as expensive as other types of HV xfmrs. Then after
> at-
> tending my first Teslathon at Richmond,VA. last year, I finally obtained a
> couple
> of 1 kVA, 7200 volt potential transformers. These babies beautifully powered
> my
> large Tesla sytem (Medusa) and for the first time I was reaching the 8 ft.
> spark
> threshold. These PTs could take a licking and and keep on ticking.
>
> Then, last March I finally purchased a pole pig. Pigs are really quite
> economical
> when compared to other types of HV xfmrs. I purchased a remanufactured 10 kVA
> 14400/240 volt pole pig from a transformer shop in Greenwood,MS. (I live in
> the
> Memphis,TN. area) for a decent $270.
>
> Once I figured out how to properly ballast this beast, I removed the PTs from
> my
> power cabinet and permanantly replaced them with the pole pig although I had
> to leave the pole pig outside the cabinet since it wouldn't fit inside. Now
> 'Medusa'
> handily produces bright, fat and extremely loud 8 to 10 ft. sparks with its
> 12"x41"
> resonator and 8"x33" toroid with the power control variac only turned up to
> about
> 75% and the panel meters showing about 8 to 9 kVA input! I feel that the
> sparks
> could probably even reach out a little further if I had more space around the
> coil.
>
> Well, I just thought that I pass on this info as this seems to be a well
> discussed
> topic on this list. The bottom line is that the pole pig is simply
> unsurpassed as
> a truly reliable Tesla system power source and would probably never
default to
> the parasitic kickbacks from the primary circuit. And you can't get more
watts
> for the buck!
>
> Keep it Sparkin'
> David