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Re: [TCML] Questions on grounding



Hi Dex,

Yes, if you look at this from a static input power between a hot gap and a cool gap. With a cool gap, the loss in heat across the gap will be reduced allowing the secondary to gain input power due to the fact that when the cap discharges through the primary, the gap resistance has been reduced allowing higher currents across the gap and primary resulting in a larger emf and energy transfer to the secondary.

If we limit power to 20A in both cases (hot and cool gap), spark lengths will be lower with the hot gap. This is proof that the energy converted to power in the secondary has been reduced due to current in the primary stage. Keep in mind that power and spark length is a squared law affect. In order to double spark lengths, the cool gap must allow 4 times power transfer to the secondary. So it's not a 1:1 ratio. If it were, there would be far more detail in the output between hot and cool gaps. This is why a gap that has twice the losses of a properly cooled gap can still achieve 75% of the hopeful spark length.

Take care,
Bart

Dex Dexter wrote:
Are you suggesting tesla secondaries receive both more average and peak power if static gaps are properly cooled?

Dex
--- bartb@xxxxxxxxxxxxxxxx wrote:

From: bartb <bartb@xxxxxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Cc:
Subject: Re: [TCML] Questions on grounding
Date: Thu, 16 Apr 2009 18:12:45 -0700

Likely a small change in power in one direction or the other. A hot gap will fire at a lower voltage at a faster rate. A cool gap will fire at a higher voltage at a slower rate. I don't think there is a large power factor difference. But there is a difference in the resistive losses across the gap between the two (to some degree), so there will be some change in the non-reactive region. I'm not sure that the differential value is even worthy of noting, but it might be. Good question.

Take care,
Bart

Dex Dexter wrote:
Does that mean that power input (W) increases while apparent power drawn (VA) remains aprox. the same in a cooled static gap tesla transformer?

Dex
--- chriskarr4@xxxxxxxxxxx wrote:

Hello Joe,
The reason that a fan on the spark gap helps improve output of a Tesla coil is that it helps to extinguish the arc and blow out the ions. When the ions are all gone, the gap takes a higher voltage to make it break down, which means that there's more 'bang energy', resulting in more energy transferred to the secondary coil and that means larger streamers on the output.
Christopher

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