About new gap design

To: tesla-at-pupman-dot-com
Subject: About new gap design
From: Esondrmn-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Thu, 17 Feb 2000 17:13:59 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme


I haven't seen any response to my post listed below.  Is there any chance 
this gap will outperform my existing async rotary?  What about heat?  Will I 
need to make this out of something that will stand a lot of heat, like G10 or 
maybe bakelite?

Thanks, Ed Sonderman

As I mentioned the other day, I am designing a new linear gap for my 6" coil 
running at 7 kva.  I am curious to see if this gap will quench and to compare 
it's performance against my async rotary.  I plan to use 11 of the 1.0" dia 
copper tubing coupling pieces for a total of 10 gaps.  I will also use a 
vacuum motor to create strong air flow through the gaps - for quenching and 
cooling.  I plan to design the gap so the copper pipe sections are gapped at 
.030" by using small spacers between them at the ends.  By changing these 
spacers, I will be able to adjust the gap distance.

I am running a 14.4 kv  5kva distribution transformer at about 7 kva.  I am 
not exactly sure what the output voltage is but know I have some primary 
losses due to the inductive and resistive ballast.  I am also using the 
higher output tap on the variac, so for sake of discussion, let's say the 
output is 15 kv.  This would be 21,200 volts peak to peak - so the cap would 
charge to one half of this or 10,600 volts.  How do I determine how wide I 
want the gaps set to fire at about 10,000 volts?  Is the .300" that I have 
planned close?

How about heat dissipation?  How hot is this gap going to get?  I recall 
someone saying that the gap eats up about 7% of the available primary power.  
Is this close?  Does that mean that I will have 7% of 7kva or about 500 watts 
dissipated in the gap?

Thanks,  Ed Sonderman