Re: [TCML] More tc info

[Mddeming@xxxxxxx]

In a message dated 3/13/08 7:52:58 A.M. Eastern Standard Time,  
rmferaligator@xxxxxxx writes:

The coil  has a 15kv 30ma transformer
Primary is 6 turns of 10 awg plastic insulated  copper wire with each turn on 
top of each other the form has a diameter of 5  inches. The secondary sits In 
the center of the primary the secondary is an  uncountable number of turns of 
28awg plastic insulated wire the form is 7  inches tall 2 inches wide. The 
terminal is two 1 foot diameter stainless steel  bowls soldered together the cap 
is salt water that is saturated with  salt
With glass boylan ginger ale bottles
With galvanised bolts. Linked  together
With copper strips.. The spark gap(not to be confused with The  safety gap)
Is composed of two "L" brackets with stainless steel bolts w/  end caps
I hope this helps

Cheers,
Reuben
Sent from my Verizon  Wireless  BlackBerry
_______________________________________________


Hi Ruben,
 
 1)   It is very possible that your primary is shorting  internally. The 
power supply is probably putting out 18-21 kV peak, if  your gap is set right, 
meaning that, with 6 turns close wound, you have 3000 V+  between turns. The 
insulation on standard household wire is rated for about 600V  giving you only 
~1200V insulation between turns. You may find tiny pinpoints of  black between 
the turns. Spacing the windings may improve this. 
 
2) For your secondary, PVC coated wire UL1007/1569 is only rated for 300V,  
PVC MIL-spec MIL-W-16878E type B is 600V rated, and Teflon MIL-W-16878-E  
(UL1213) is also 600V. The nominal OD for 28ga.  is around 0.035" for  Teflon 
(figure 28 TPI) and 0.046" for the PVC" (about 21TPI) Meaning your  secondary at 7" 
is not more than 200 turns at best. H=7", R=1", N=200, meaning  roughly: 
Ls=0.506 mH
 
3) At about 5 TPI I'm guessing your primary is wound about 1.2"=H X  2.5" R, 
N=6, meaning roughly: Lp=7.25 mH. Theoretical voltage gain is  sqrt(Lp/Ls) or 
a voltage gain of less than 3.8.
 
4) Your maximum gap setting should not exceed ~6 mm. If your brackets are  
fastened to a wooden base, be aware that above ~10 kV wood starts  to become 
conductive and power may be bypassing the gap inside the  wood.
 
5) I suspect, but have not run the numbers, that your primary and secondary  
are very out of tune.
 
These are just the most glaring problems, others may have more  suggestions.
 
Hope this helps,
 
Matt D.



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