[TCML] power losses through GTO wire

[jeff mill]

Thank you all for the reassurance on the size of my secondary. This is 
actually my first small/medium sized tesla and even with all the resources 
out there, man and there is a lot, you still question yourself. I work with 
large UPS back up systems but have never experianced  or worked with the 
high voltages / theory of the tesla but always wanted to learn.
I guess what I reaaly wanted to know is will I see a large increase in 
performance when I actually shorten the 12ft x 2 wires to the primary  down 
to , say 1ft. I work with Higher currents and lower V in my trade, so be 
easy on me, here is how
I picture it. If I'm pulsing say 200amps to my primary  the dc resistance is 
very low in the primary with 8 turns of 1/4 inch copper, just to grab a 
number , say .1 ohms. Then say my gto , 24ft is .1 ohms then half of my 
power going to the primary is lost across the gto wire length ? I know this 
isn't correct in thinking, so help me see the light.

-----Original Message----- 
From: David Speck
Sent: Saturday, February 18, 2012 10:02 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] power losses through GTO wire

Jeff,

Conventional thinking on secondary coil dimensions suggests that the
optimum ratios of length to diameter should be between 3.5 and 5.  Your
secondary is at 4.7, so your system should be fine just as it is.

Dave

On 2/17/2012 10:08 PM, jeff mill wrote:
> Hello
> Got a question
> Just got done building a 6" X28" secondary. After the fact I did further 
> reading and found that a 6 X 24 would have been more closer to ideal. If, 
> after testing I am not satisfied with the results would there be a way to 
> "buck" the upper 4" of the coil temporarily without physically removing or 
> cutting in and tapping the windings ? Say a temporary 8" dia by 2" winding 
> on a form wired out of phase at the top ?
> Also I am bench testing this, everything on my bench then two 12 foot of 
> gto wire to the primary . I am trying to figure my losses through the 15 
> ft of gto wire. Would it be a dc loss or a loss at the operating freq 
> 120khz. Another words if it was calculated as a a dc loss then the 
> resistance of the wire would be much greater than the 8 turns on the 
> primary and the loss would be large but if it were calculated as an ac 
> loss the impedance of the primary would be around 16 to 20 ohms and the 
> wire, being less than an ohm the loss would be negligible ?
>
> Really need some help here as I don't know if I should be judging my 
> results this way or wait until everything is mounted in my enclosure and 
> gto wires are much much shorter
>
> Thanks, JM
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