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Re: [TCML] power losses through GTO wire
Jeff,
As elsewhere mentioned, losses in the spark gap are a significant factor
in the operation of the coil.
That said, I endeavor to use relatively heavy gauge conductors in the
primary circuit -- i.e. the loop between the ends of the primary coil,
the primary cap, and the spark gap. When the primary is oscillating,
you have 100 - 200 amps sloshing back and forth at RF frequencies, so I
would avoid GTO cable anywhere in that loop. Try to keep the cables as
short as practical and use good connectors throughout.
The leads from the HV transformer to the cap can be smaller -- even a 15
kVA pole pig can only supply about one amp max at 14.4 kV, so 18 Ga GTO
from the transformer to the primary should be adequate.
Remember that current thinking suggests placing the gap across the HV
transformer. Although it seems counterintuitive, this arrangement helps
protect the transformer secondary windings from excessive spikes during
primary circuit ringdown.
Dave
On 2/18/2012 8:02 PM, jeff mill wrote:
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.
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