Re: [TCML] Re:Pros and cons

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

Yes,but please explain me why VTTC sparks don't successively
extend in multiple pulses regime through a previously 
ionized channel?Ionization of the previous channel is not
high enough or?I would say an average temperature of VTTC 
channel is even higher than that of SGTC spark.

Dex 
 

--- jimlux@xxxxxxxxxxxxx wrote:

From: jimlux <jimlux@xxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Re:Pros and cons
Date: Tue, 15 Dec 2009 20:01:42 -0800

Steve Ward wrote:
> Hi Dex,
> 
> Glad you could chip in here a bit, i was having trouble finding any good
> references for coils with discharges much longer than the top voltage would
> suggest.  More comments

I suspect that most coils are in this category. at 30kV/cm, 200-300kV 
(which is probably a typical topload voltage for a small NST coil) would 
only support a spark of 7-10cm, and sparks much longer than that are common.

The difficulty is multifold:

The field is very non-uniform, which tends to lead to longer sparks, 
even in a single shot environment (Bazelyan and Raizer's book talks 
about this a lot, in connection with EHV and UHV transmission systems 
and switchgear)

you have multiple pulses which can successively extend the spark through 
a previously ionized channel.

As an obvious indication of unusual behavior, a lot of coils have sparks 
longer than the distance from topload to base, without arcing over the 
secondary coilform.
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