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Re: Secondary Research (fwd)



---------- Forwarded message ----------
Date: Thu, 27 Feb 1997 15:58:20 -0800
From: Skip Greiner <sgreiner-at-mail.wwnet-dot-com>
To: Tesla List <mod1-at-pupman-dot-com>
Subject: Re: Secondary Research (fwd)

Tesla List wrote:
> 
> ---------- Forwarded message ----------
> Date: Thu, 27 Feb 1997 09:09:24 +1200
> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-pupman-dot-com
> Subject: Secondary Research
> 
> Hi All,
>         I still have a long way to go in this exercise, but thought a
> preliminary finding might be of interest. It seems clear that the
> efficiency of a number of power supplies (or use of available power)
> leaves a lot to be desired. A reality check on one of the largest
> systems in the survey shows that power getting to the primary all but
> matches the measured power input. You can check your system by:
> 
> (1) Measure power input (watts, not V.A.)


Maybe a dumb question: How do *YOU* measure watts?

Skip



> (2) Multiply break rate by peak capacitor energy (0.5CV^2) to get a
> figure in watts and compare the two.
> 
>     In a lot of cases I've checked so far these two figures are
> worlds apart. To get maximum efficiency, resonant or inductive
> charging of Cp is a must. Unfortunately, using neon transformers to
> best effect like this can result in an early death for them. To be
> fair, I have assumed that neons are being used right up to peak o/c
> output voltage. This will not always be the case. You can open the
> gap so wide that the transformer takes a couple of cycles to swing up
> to some enormous values halving or reducing rep rate for a static gap
> even further. Closing the gap to a more reasonable value gets the rep
> rate to the desirable value but reduces Ec considerably.
>     It would be most useful to have a table of gap settings vs
> breakdown voltage (which will be somewhat different from DC) but it
> will no doubt vary for different gap geometries. A useful guide
> though for ensuring neon survival in my opinion. I have read of
> instances where gaps have been opened up to 1/2" or more. As a rough
> guide, the gap on my coil here at work fires at around 8kV when set to
> about 0.06" (1/2" rounded tungsten electrodes).
> 
> Other comments welcomed of course,
> Malcolm