Re: [TCML] Secondary Coil Capacitating

[Miles Mauldin <teslamiles@xxxxxxx>]

I don't have an electroscope to measure the actual potential, but I do have an 
electrostatic locator, which clearly points to the secondary and "sees" the 
presence of an electrostatic potential (static) from several feet away, even 
hours after the coil has been run.  My scale is 1-30,000 volt and the metter 
will peg if I get within 5 inches shortly after a run.  Interesting comments 
though, I have always thought it was just a build up electrons on the insulation 
coating of the secondary (just like static electricty in nylon), verses anything 
more in-depth.  Wrong?

Miles
(not the smart one, the other one in Atlanta)




________________________________
From: EVP <evp@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Tue, December 7, 2010 10:29:19 AM
Subject: Re: [TCML] Secondary Coil Capacitating

  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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> 
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