Re: Idea for a ground..
Subject: Re: Idea for a ground..
From: mark.graalman-at-mediccom.norden1-dot-com (Mark Graalman)
Date: Sat, 04 Mar 1995 07:00:00 -0500
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NTAC> From rob-at-atitech.ca Fri Mar 3 14:15 MST 1995
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NTAC> Date: Fri, 3 Mar 1995 15:26:49 -0500
NTAC> From: rob-at-atitech.ca (Rob Bicevskis)
NTAC> To: tesla-at-grendel.objinc-dot-com
NTAC> Subject: Re: Idea for a ground..
NTAC> Since a Tesla coil can be thought of as an antenna (?), - or more
NTAC> specifically as a 1/4 wave vertical - wouldn't it be almost as
NTAC> effective to just use a metal sheet under the coil as a ground plane?
MG> I would'nt exactly call it an antenna...........
NTAC> One could approximate this with just radial wires - or use a mat of
NTAC> link fence or 'chicken' fence.
MG> Well, radials work well mainly if they are VERY long, something on the
order of about 2000 feet, and you have them placed evenly around the base
at about 5 degree increments. What you are in effect doing is making a
artificial ground. This would acually be better than the typical couple
of ground rods, but not very practical.
NTAC> By the way, I have never connected the 'bottom' of my secondary to
NTAC> earth ground - just to the bottom of the primary - which goes directly
NTAC> to one side of the transformer - so it is 'floating.' Any comments
NTAC> on this practice??? (This is a 2 KVA system - (secondary is a 4" diam
NTAC> by 1 meter long coil.) currently throwing 1 meter long sparks.)
MG> You are VERY VERY lucky you haven't killed your drive transformer!!!
Take the secondary off the transformer and connect it to the transformer
case (center tap) and then ground the transformer case to a good earth
ground. I run my primaries with the inside turn connected to ground, and
the secondary grounded there also, but that can't be done with neon
transformers unless you only use half the neons secondary. In your
system the secondary is looking for ground THROUGH the neon transformer
secondary, NOT VERY SAFE INDEED!!!
... Alias, Mark the spark
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