Re: Racing sparks Re: [TCML] Flashover Follow

[Futuret <futuret@xxxxxxx>]

 Miles,

Here's some various things I've noticed over the years.

I experimented with two different secondary coils on my old research coil.
Using the 6" dia secondary, I was able to use 0.12 coupling, but for the
4" dia secondary, I was only able to use 0.10 coupling before getting 
racing sparks.  I used the same primary in both cases.  Maybe the
tighter radius of curvature on the 4" secondary was a factor, or maybe
the insulation on the 4" coil wasn't as good.  Or maybe the need to
lower the 4" secondary bottom below the primary was a factor.  In any
case I got the same spark length with either secondary.  

The power level is a factor too for racing sparks.  A coil that is physically
small for a given power factor will be more prone to racing sparks, as will
a coil that has a large bang size.  Maybe the ratio of toroid size to secondary
size is a factor too since I used the same toroid on both secondaries.  In 
some cases using a too large toroid can cause racing sparks possibly
because the voltage builds up too high before breakout and quenching
time gets much longer if the sparks struggle to break out.  If a spark
gap overheats and quenching gets bad, a massive flurry of racing sparks
can result.

Cheers,
John

 


 

 

-----Original Message-----
From: Miles Mauldin <teslamiles@xxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, Dec 8, 2010 8:12 am
Subject: Re: Racing sparks Re: [TCML] Flashover Follow I have even gone back and measured the physical dimensions 


of my primary and secondary and JavaTC still provides the same results.  .125k 

coefficient.

230.3 kHz = Primary Resonant Frequency

14.46 % high = Percent Detuned

0 deg° = Angle of Primary

18.1 ft = Length of Wire

3 mOhms = DC Resistance

0.196 inch = Average spacing between turns (edge to edge)

1.114 inch = Proximity between coils

1.21 inch = Recommended minimum proximity between coils

15.821 µH = Ldc-Low Frequency Inductance

0.02195 µF = Cap size needed with Primary L (reference)

0.098 µH = Lead Length Inductance

59.868 µH = Lm-Mutual Inductance

0.125 k = Coupling Coefficient

0.13 k = Recommended Coupling Coefficient

8  = Number of half cycles for energy transfer at K

17.2 µs = Time for total energy transfer (ideal quench time)



 
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