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Re: [TCML] X-ray cable best practices for feeder cable



DC
I don't question your observation but I offer a simple common explanation in the loss of secondary earth which will give sparks of any length you like. I would love to make 125kV sparks fom 14.4kV from a single coax as would others. I don't have the book. Could you explain the single coax multiplier components?
Peter

----- Original Message ----- From: "DC Cox" <resonance@xxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Friday, January 09, 2009 11:14 AM
Subject: Re: [TCML] X-ray cable best practices for feeder cable


ok, then explain this:

Running 14.4 kV into a standard Tesla oscillator circuit, I observed fat
capacitive sparks firing across a 125 kV BIL pole pig bushing.
I saw this with my own eyes so I know it is possible and I recommend using a
safety spark gap to detect this ---- or keep buying pigs if
a resonance occurs.

So, please explain how we went from 14.4 kV to in excess of 125 kV?

This is certainly more than 2 or 4 times the input value.

My only explanation is blumlien, and according to the book, Power
Electronics, by Sargent, it is possible with a single coaxial coil to
achieve this.

D.C. Cox

On Thu, Jan 8, 2009 at 5:59 PM, Peter Terren <pterren@xxxxxxxxxxxx> wrote:

DC and I disagree on this.
In my opinion the most likely cause of huge arcs at the pig end is a
disconnection of the secondary earth. The base of the secondary then arcs to
the primary and puts the full TC voltage onto the primary line.  Easily
gives huge arcs at the pig.  Ask me how I know.
In my reading of Blumlein voltage multipliers using coax cable and spark
gaps, it is possible to get 4 to ?8 times voltage multiplication with
multiple gaps and complicated multiple coaxes. It is not just a simple coax
and gap that will do it though.
I use earthed coax for safety reasons.
Peter
www.tesladownunder.com

----- Original Message ----- From: "DC Cox" <resonance@xxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, January 07, 2009 4:07 AM
Subject: Re: [TCML] X-ray cable best practices for feeder cable


Resonance can be quite wonderful, or, as Phil explains in his examples,
very
destructive.

Resonance in your HV feeder cable is not something you want, so I avoid
using any feeder cable that is coaxial in nature, ie, has a ground
shield around it.  X-ray cables were designed strictly for DC power
transmission and not for transferring AC power.
Been there, done that ----- and it cost me a pole xmfr!

Dr. Resonance


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