Re: [TCML] Secondary Coil Capacitating

[EVP <evp@xxxxxxxxxxx>]

   I think David Hull used an electrometer to investigate this 
phenomenon, which I suspect most of us have experienced.jimlux wrote.  
Rectification  because of unequal electrode geometry seems the most 
probable cause and is easy to observe.  Simplest is with a disruptive 
'spark coil' where a capacitor can be charged if a spark gap is inserted 
in one side of the circuit.  The secondary voltage has peaks which are 
quite asymmetrical which accentuate the effect.  There have been many 
gaseous rectifiers built [the original Raytheon was one of the pioneers 
back in the 1920's] which use an unequal electrode geometry, usually 
rods and plates, in a gas like helium.

Ed

> Brandon Hendershot wrote:
>
> > Hi All,
> > I was running my coil tonight, something happened underneath the coil 
> > I wanted to check out, so I went to move the secondary, and it was 
> > shocked me. Nothing brutal, just a carpet spark, but it had been off 
> > for several minutes. Why (How?) is it storing electricity? Is it 
> > between the topload and counterpoise?
>
> this is a pretty common phenomenon.  I don't know that there's a 
> provably correct explanation of why it happens, but one guess is that 
> charge accumulates on the surface of the secondary (which is a nice 
> insulator).  The question would be that since the sparks and coil are 
> AC, why would one polarity preferentially accumulate.  However, it's 
> well known that corona discharges have a polarity preference, so there 
> are mechanisms that could account for it.
>
>
> If you hunt through the archives, (I'm not sure what you'd use as a 
> search string) you'll find discussions of it.  Probably 3 or 4 years 
> ago at least.
>
>
> Thanks guys,
>
> > Brandon_______________________________________________
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