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Re: breakout voltage
Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
If you are applying this to a Tesla coil, no, it is not at all accurate. TC
spark output depends on inductance ratio not spark length --- as the spark
"grows" much longer through repeat ionization of the air near the HV
terminal. You can see this effect with a very high speed camea.
You equation is for DC potentials.
Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo WI 53913
> The formula for the field strength on a conductor with a given radius is:
> Field strength = Voltage / Radius.
> The break down voltage for air is approximately 76KV / inch.
> This value varies with humidity, frequency, temperature, barometric
> pressure etc.
> So combining these gives:
> Max Voltage (before air breakdown) = 76KV * Radius (in inches)
> Is this correct for a close approximation?
> When applying this to a toroid I was assuming the minor radius should be
> considered since it is the smallest curve on the toroid so the field
> strength would be strongest there.
> Am I correct in assuming this formula could be applied to the minor radius
> of a toroid to get it's approximate break out voltage?
> Luke Galyan