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Tesla Ground (fwd)
From: Bert Hickman[SMTP:bert.hickman-at-aquila-dot-com]
Reply To: bert.hickman-at-aquila-dot-com
Sent: Tuesday, January 20, 1998 9:01 AM
To: Tesla List
Subject: Re: Tesla Ground (fwd)
Tesla List wrote:
>
> ---------- Forwarded message ----------
> Date: Thu, 19 Feb 1998 00:37:44 -0800
> From: Joshua Resnick <seraphim-at-WPI.EDU>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Tesla Ground (fwd)
>
> Tesla List wrote:
>
> > ---------- Forwarded message ----------
> > Date: Sun, 18 Jan 1998 21:16:19 -0800
> > From: Bert Hickman <bert.hickman-at-aquila-dot-com>
> > To: Tesla List <tesla-at-pupman-dot-com>
> > Subject: Re: Tesla Ground (fwd)
> >
> > Tesla List wrote:
> <SNIP>
> >
> > The aluminum RF ground should be OK for a while with your low power
> > coil. With time, however, the aluminum will corrode away to nothing in
> >
> > the ground, so plan on replacing it with a copper-plated steel ground
> > rod. These are really not very expensive and will last for a LONG
> > time.
> >
> > Do NOT connect the secondary to the primary when using a neon
> > transformer as a power source! In general, connecting the primary and
> > secondary is not a recommended practice, even when powering off
> > isolated-secondary transformers (i.e., pole pigs or potential
> > transformers), since if not done properly, it can result in high
> > voltage
> > 60 Hz power appearing at the top of the secondary! Also, this approach
> >
> > will NOT work with neons due to the way that neons are internally
> > connected - the HV center tap is tied to the case.
> >
> > Keep your primary tank circuit and the base of the secondary isolated.
> >
> > You may want to connect the case of the transformer to the same RF
> > ground that you use for the base of the secondary... but make sure you
> >
> > have a good RF ground connection first!
> >
> > Safe Coilin to you, Matt!
> >
> > -- Bert --
>
> Just a question.
> I am aware that some people connect the secondary to the primary . My
> question is where and why????
> --->Josh<---
>
> --
> ____
> /\/\ ((____)) /\/\/\/\ Joshua "Flux Boy" Resnick
> / | | \ \ http://www.wpi.edu/~seraphim
> / | | \/\/\ \ __ http://ece.wpi.edu/~seraphim
> / ____| |____ \
> |||||||||||||| \ "Two parts oxygen and one part
> lovin'."
Josh,
This approach works if one end of the high voltage supply is grounded,
and this same end is also connected to the base of the secondary. Now,
if the grounded end is also connected to the innermost turn of the
spiral primary coil, you end up with minimal voltage difference between
the primary and bottom of the secondary, reducing voltage stresses
between the two. This helps minimize the possibility of getting a hot
power arc from the primary to the secondary which could damage the
secondary winding.
This configuration also permits the primary to be positioned a bit
closer to the secondary which results in better coupling and a more
compact primary. However, this approach cannot be used with neon
transformers due to the center-tap being tied to the core/case of the
neon. Hope this helped!
Safe coilin' to you, Josh!
-- Bert --