Re: [TCML] Optimal secondary height, was power losses through GTO wire

[Futuret <futuret@xxxxxxx>]

Jeff,

I agree with Dave that your system should be fine as is. 
A taller secondary gives the advantage of fewer strikes to
the primary or ground, and less danger of racing sparks
and breakdown along the secondary form at higher powers.

The only possible disadvantage of a tall secondary (that
is still in the optimal range) is that it may cause clearance
issues with the ceiling if you're running indoors in with
limited ceiling height.

With a taller secondary you'll tend to use more primary
turns which also tends to reduce spark gap losses which
thereby increases overall efficiency of the Tesla coil.  

Cheers,
John

 

 

 

-----Original Message-----
From: David Speck <Dave@xxxxxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sat, Feb 18, 2012 11:40 am
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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