Re: Bypass caps and Neons *NEEDED!* (fwd)
---------- Forwarded message ----------
Date: Mon, 15 Dec 1997 17:56:13 -0500
From: "Edward J. Wingate" <ewing7-at-frontiernet-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Bypass caps and Neons *NEEDED!* (fwd)
Tesla List wrote:
> ---------- Forwarded message ----------
> Date: Mon, 15 Dec 1997 16:23:26 EST
> From: Esondrmn <Esondrmn-at-aol-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Bypass caps and Neons *NEEDED!*
> In a message dated 97-12-13 20:55:16 EST, you write:
> - snip -
> << I neglected to mention, safety gaps across the primary
> cap IMHO is a BIG NO NO, safety gaps go from the
> transformer end bell to ground, a gap across the primary
> cap places a SMALL inductance directly across the
> primary cap and when it fires results in a ring frequency
> of 5-15 mhz or higher of very high current that is coupled
> to NOTHING, deadly for capacitors.
> Mark Graalman
> You say a safety gap across the tank capacitor is a bad idea? After blowing
> two C.P. caps, it was suggested by at least a few folks on this list that I
> add a safety gap across the cap to protect it. I am using a 14.4 kv pole pig
> running at 5 to 8 kva. The gap is currently set at 5/8" and fires like a
> rifle when I try to put too much power into the system. The gap uses #10
> solid copper wire bolted directly to the capacitor terminals. The gap ends
> are bent into 1.0" diameter circles and soldered and de-burred.
> I would like to hear other folks opinion on this subject. I believe both Mr.
> Cox and Malcolm suggested the addition of the safety gap across the cap.
> Malcolm, you have the same C.P. caps that I have. What kind of safety gap do
> you use, what transformer voltage, and how far do you open the gap?
> Ed Sonderman
I also suggested using a safety gap across your tank cap and never
personally run a system without one. I have NEVER blown a cap using a
safety gap, but have seen many tank caps blow as a result of not using
one. Just one transient overvoltage from a mistuned coil can send an
expensive cap to the happy hunting ground. From my experience talking to
coilers at Teslathons and elsewhere, over 60% use some type of safety
gap across their tank cap. FWIW.