Re: Grounding (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 11 Aug 2007 23:09:57 -0500
From: BunnyKiller <bunnikillr@xxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Grounding (fwd)

Hey Tim ...and all..

the description follows as is..

I have 2  14.4 KV pole pigs in series producing 28.8 KV at a nominal 
input of 240VAC ( at 60A)  when driven by the variacs to an input to 
280VAC, the primary coil will see approximately 30KVish volts. As far as 
grounding the system, the secondary is grounded to 2 8' solid copper 
rods set 10' apart  (( rod | 10' |rod--secondary base)   the center tap 
of the pig (pig ground) is grounded to the same RF ground as the 
secondary.  I have the control case grounded to the 240VAC input ground( 
(the green wire from the wall... altho I still get tingles from the 
control case when running the coil)

My system is set up with the caps in parallel with the voltage supply 
and the gap in series with the coil... this manner allows the caps to be 
charged to a full capacity when the gap conducts ( altho it will allow a 
overvolt situation to occur if the gap misfires ( but then again im 
running my caps at 200KV capacity (( 4 caps in series at 50KV))... not 
too much of a chance of overvolting the caps) ) pretty much charging the 
caps directly and not thru the primary coil as others may choose...

end results....    variac set on full output ( 280VAC into the piggie 
drawing 65A produces 12-15' long streamers)   long enuf to be scarey :)

Scot D




Tesla list wrote:

>---------- Forwarded message ----------
>Date: Sat, 11 Aug 2007 18:47:09 -0400
>From: timjroche@xxxxxxx
>To: tesla@xxxxxxxxxx
>Subject: Re: Grounding (fwd)
>
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>Bart,
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>? on a pole pig, you have the two HV connections on top (ears, if you will) and the LV connects or lugs coming out of the can; so you are saying you hook one of the HV ears to RF Ground??? do you also hook one side of the gap to RF ground?? i understand the TC secondary bottom winding, but the inside primary?? with a gap in parallel and tank cap series to the pole pig?? how do you create a potential difference in the tank circuit so the SRSG will fire?? 
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>tim
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>-----Original Message-----
>From: Tesla list <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Sent: Sat, 11 Aug 2007 7:47 am
>Subject: Re: Grounding (fwd)
>
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>
>---------- Forwarded message ----------
>Date: Thu, 09 Aug 2007 19:38:03 -0700
>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: Grounding (fwd)
>
>Hi Tony,
>
>I divide my grounds between a dedicated ground (RF) and mains ground. I 
>use a little different hookup between my NST powered and pig powered 
>coils. Because NST's are core and case grounded to one end of each 
>internal HV coil, I ground the NST to RF ground. The primary is floating 
>and can't be tied to ground. Mains ground ends at the control panel. For 
>my pig applications, I ground one hv bushing to RF ground and tie both 
>the bottom secondary and inside turn of the primary to RF ground (with 
>the pig, we are not limited to a floating primary, but we could run in 
>that fashion if desired).
>
>Keep this in your mind: Anything you will come in contact with while 
>running the coil should be at mains ground. RF ground is used for a 
>couple reasons; 1) to attach ground where needed and 2) to separate RF 
>ground from mains ground to prevent as much RF hash from getting back 
>into the mains ground line (which is connected to all the house wiring).
>
>It is good to have several RF ground rods or even a mesh buried between 
>them for a better ground connection to earth. There's no problem with 
>doing that. It is labor intensive, but a good idea especially in areas 
>where the ground is very dry. In areas where there is a decent amount of 
>rain fall and the ground is relatively moist, even a single ground rod 
>will be ok.
>
>One other aspect is running without an RF ground altogether. The coil 
>will work, sure, but this mode of running a coil is unwise because the 
>coil will find it's way to mains ground one way or another. This can be 
>lethal for the components in your house and neighboring houses. Even a 
>rod in really dry ground can cause the same situation.
>
>Take care,
>Bart
>
>
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>Tesla list wrote:
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>>---------- Forwarded message ----------
>>Date: Thu, 9 Aug 2007 21:23:33 -0700
>>From: Anthony R. Mollner <penny831@xxxxxxxxxxxxx>
>>To: Tesla list <tesla@xxxxxxxxxx>
>>Subject: Grounding
>>
>>I've heard a few things about grounding and I was hoping to get some real
>>insight on this. Ok, the secondary deserves a really good ground connection
>>but what about the power supply and the tank circuit? Not to mention any
>>other line or transformer circuits that might be included? Should all
>>grounds be independent? Should they all be attached to the same ground rod?
>>How about multiple grounding connections like water pipes and ground rods?
>>Should the ground connection at the panel be used as well or separately from
>>the rest of the circuit? My experience has been that the more the better,
>>tied together or not.
>>
>>Tony
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