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Re: [TCML] pole pig question ###
Best to recase the pole xmfr in a steel case measuring 18 x 18 inches
square x 19 inches height. Use a 1/4 inch phenolic top for the lid and
silicone GTO wire for the HV exit. Ground the other HV terminal inside
the case. Only one HV wire out and no bare sections for exposure like on
a standard pole xmfr with bare steel atop the bushing. I use this case
with a 3/4 lip all around the top to fasten the lid to. I also put 4 1 x
1 inch right angle bracket feet welded on the case so it can be firmly
bolted down in an enclosure or to a small cart on caster wheels.
Keeping xmfrs in a case increases safety and reduces the total weight with
oil to around 110 lbs.
NEVER make any adjustment on the pri tap without actaully unplugging the
unit from the wall. NEVER trust a switch or relay with your life.
Regards and safe sparking,
Dr. Resonance
> Hi Hans,
>
> That's why I actually place the pole pig inside my control panel.
> I can't accidently bump into any bushng when the pig is com-
> pletely enclosed inside my control panel assembly. Of course
> this added weight does make for an extremely heavy control
> panel assembly - ~ 500 kilograms.
>
> David Rieben
>
>
>
> ----- Original Message -----
> From: "Hans Schattenmeister" <klugmann@xxxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Monday, January 28, 2008 5:19 AM
> Subject: RE: [TCML] pole pig question ###
>
>
>
> The only thing that frightens me about this configuration is the danger of
> electrocution. With two hot HV bushings you can accidently bump one and
> survive. With one bushing grounded the other remains hot at a full 14.4
> kV.
> Bump this one and you'll die. Just a thought. Your rubber tennis shoes
> won't
> insulate you from 14.4. They might protect you from 7.2 kV.
>
>
> Herr Schattenmeister> From: drieben@xxxxxxxxxxx> To: tesla@xxxxxxxxxx>
> Subject: Re: [TCML] pole pig question ###> Date: Sun, 27 Jan 2008
> 07:45:31 -0600> CC: > > Yep, I have have to totally agree with the good
> doctor> about grounding one ear of the pig. As a matter of fact,> since
> you
> can ground one ear of the pig, this means that> you can indeed use a
> SINGLE
> eared pig and use the> case as the return ground. "I" tie this case ground
> of the> pig to the RF ground and leave it isolated from the mains> ground
> since I also tie both the primary and secondary> coils' base to the RF
> ground as well.> > I think DC and I may veer a bit in our opinions in how>
> you get the HV from the pig to the base of the coil. "I"> like to use
> x-ray
> cable and let the outer shield be the> RF ground while letting the inner
> condutors carry the> HV potential. DC has had issues with the Blumlein
> ef->
> fect from using some type of coax for the transmission line> but I have
> never had any problems with this using x-ray> cable, but that's another
> thread/discussion.> > He is also totally correct in playing it safe by
> completely> unplugging the power before "laying on of hands" to the> naked
> conductors of the primary circuit. Also, make> darn sure that the
> capacitor(s) is completely discharged> (better yet - crowbar shorted!)
> before doing this.> > David Rieben> > > > ----- Original Message ----- >
> From: <resonance@xxxxxxxxxxxx>> To: "Tesla Coil Mailing List"
> <tesla@xxxxxxxxxx>> Sent: Saturday, January 26, 2008 7:26 PM> Subject: Re:
> [TCML] pole pig question ###> > > >> >> >> > a typo ---- should be NEVER
> trust your life to a relay or switch.> >> > Dr. Resonance> >> >> >>> >>>
> >>>
> >>> >> Best to ground one of the pigs bushings, ie, run it single ended
> ouput.> >>> >> also, NEVER just "shut off the power while adjusting pri
> tap". This is> >> suicide. NEVER trust your like to a switch or relay.
> ALWAYS UNPLUG the> >> power cord from the wall before going anywhere near
> the pri coil. > >> ALWAYS.> >> Then it can never bite you, and one bite
> from
> a pole pig usually results> >> in death not just a shock.> >>> >> Dr.
> Resonance> >>> >>> >>> >>> >>> This is how I would hook it up.> >>>> >>>
> Connect 240 VAC to the transformer primary with the variac connected in>
> >>>
> series in one of the lines.> >>>> >>> Put a choke coil on the each High
> Voltage terminal and connect them in> >>> parallel with the spark gap. Do
> not ground any of the HV terminals.> >>>> >>> Connect a wire from the
> other
> side of the spark gap to 1 side of the> >>> capacitor.> >>>> >>> Connect a
> wire from the other side of the capacitor to the inside turn> >>> of> >>>
> the primary coil.> >>>> >>> Connect a wire from the other side of the
> spark
> gap to the aligator clip> >>> wire that goes to the other end of the
> primary
> coil.> >>>> >>> No choke coils in the HV lines at the primary coil.> >>>>
> >>> Connect the bottom end of the secondary coil to a GOOD earth ground.>
> >>>> >>> Connect the strike rail around the outer edge of the primary
> coil
> if you> >>> have one to earth ground too.> >>>> >>> Toroid or sphere for
> the
> top load.> >>>> >>> Turn on the 240 VAC crank up the Variac and adjust the
> primary tap for> >>> best resonance frequency. Needless to say always turn
> off the voltage> >>> before moving the aligator clip to another primary
> tap.> >>>> >>> Be sure you have a cooling fan on your spark gap other wise
> it will over> >>> heat and your coil will produce sparks for only about 10
> seconds or> >>> until> >>> the spark gap gets too hot to function
> correctly.> >>>> >>> I like to use 12 guage solid copper insulated house
> wire for all my> >>> connections it makes it very easy to bend the wires
> and
> put them exactly> >>> where I want them and they stay there. Make sure all
> wires have plenty> >>> of> >>> clearance to prevent arcs to other places.>
> >>>> >>>> >>> http://home.earthlink.net/~gary350/tc10-4.jpg> >>>> >>>
> http://www.liveleak.com/view?i=563_1188208737> >>>> >>>> >>>> >>>> >>>>
> >>> -----Original Message-----> >>>>From: Jim Calvin
> <jcalvin@xxxxxxxxxxxxxxx>> >>>>Sent: Jan 16, 2008 4:25 PM> >>>>To: 'Tesla
> Coil Mailing List' <tesla@xxxxxxxxxx>> >>>>Subject: [TCML] pole pig
> question> >>>>> >>>>Hi guys,> >>>>> >>>> I am trying to test my 25KVA pole
> pig. I am not running my> >>>>coil yet. I wanted to test the system out.
> So
> this is how I have it> >>>> wired:> >>>>> >>>>I have a 240Vac input with a
> 7.8kKVA variac with a control switch. I am> >>>>using the variac to
> regulate
> the voltage. I have a 6.5mH choke (hand> >>>> made> >>>>using 10 gauge
> wire)
> in series with the primary. I have a .05uF (at> >>>> 50KV)> >>>>capacitor
> connected to the HV output of the pole chicken as a test load.> >>>> One
> of
> the> >>>>HV outputs is connected to GND along with the pole chicken can.
> My>
> >>>> variac is in> >>>>a control box with a voltmeter and a current
> meter. I
> have a fluke> >>>> meter> >>>>across the input 240Vac of the pole chicken
> after the ballast. Between> >>>> the two> >>>>volt meters I was going to
> check the voltage drop across the ballast see> >>>> if> >>>>the it was
> doing
> it's thing.> >>>>> >>>>I set the varaic at a 100V using the meter in the
> control box before I> >>>>switch it on to the pole chicken and ballast.
> When
> I switch it on I> >>>> would> >>>>expect the voltage in my panel meter to
> stay the same and my fluke meter> >>>> to> >>>>be slightly less because of
> the drop across the ballast. I figure my> >>>> load> >>>>should draw about
> 8
> amps out of the variac.> >>>>> >>>>Well when I turn the switch on the
> power
> to the pole chicken and> >>>> ballast,> >>>> the> >>>>fluke meter is
> giving
> 110v and the meter in my control box jumps from> >>>> 100> >>>>to 110V
> (aprox. It is an analog meter).> >>>>> >>>>Then I decided to use my
> oscilloscope (I am part owner of design> >>>> consulting> >>>>company and
> I
> have access to this equipment) and check the voltage> >>>> before> >>>>the
> ballast and after. Well the voltage after the ballast went up just> >>>>
> like> >>>>the fluke had shown.> >>>>> >>>>What am I doing wrong? Is it
> possible that the HV output is leaking> >>>> back> >>>> to> >>>>the
> primary?
> What is the isolation voltage between primary and> >>>> secondary?> >>>>>
> >>>>I got this pole chicken from T&R electric. It was actually a gift
> from>
> >>>> a> >>>> bunch> >>>>of friends/fellow coilers). It is supposed to be
> new/reconditions and> >>>>checked by them.> >>>>> >>>> >>>
> _______________________________________________> >>> Tesla mailing list>
> >>>
> Tesla@xxxxxxxxxxxxxx> >>> http://www.pupman.com/mailman/listinfo/tesla>
> >>>>
> >>> >>> >> Dr. Resonance> >>> >>
> _______________________________________________> >> Tesla mailing list> >>
> Tesla@xxxxxxxxxxxxxx> >> http://www.pupman.com/mailman/listinfo/tesla> >>>
> >> >> > Dr. Resonance> >> >
> _______________________________________________>
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Dr. Resonance
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