Re: Quenching

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: Re: Quenching
From: Tesla List <tesla-at-stic-dot-net>
Date: Wed, 10 Sep 1997 18:57:17 -0500
Approved: tesla-at-stic-dot-net


From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Wednesday, September 10, 1997 6:18 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Quenching

A further thought on this one John:

> From:   FutureT-at-aol-dot-com[SMTP:FutureT-at-aol-dot-com]
> Sent:   Wednesday, September 10, 1997 5:53 AM
> To:     tesla-at-pupman-dot-com
> Subject:    Re: Quenching
> 
> I<< snip>   Without going through all the steps, I finally tried the air jet 
> > at full pressure. Now the gap was very loud and bright, output had 
> > sunk to a real low, and I actually achieved quench at the end of the 
> > second ringup with no breakout. It is clear this was a totally useless 
> > setting because while the quench looked excellent on the scope, the 
> > gap was dissipating the bulk of the power. This was borne out by the 
> > abysmally short discharge to the ground wire. BTW, the full air jet 
> > was so violent the spark was considerably displaced from the centre 
> > of the gap electrodes.
> 
> Malcolm,
> 
> By second ringup, do you mean the second notch; the second
> complete transfer of energy to the secondary?  If so, this should
> be the perfect place to quench I would think.  Could it be that some
> firings were being skipped, or missed?  Could this be what some
> people refer to as "overquenching"; the gap is sometimes prevented
> from firing due to excessive air?

I think what is happening is that the spark resistance siprals 
upwards as the spark channel is being lengthened. There is no doubt
about the extra dissipation. The gap was as loud as a gun. Also,
the gap does need to be set shorter with a blast of air rushing 
through it.

Malcolm