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Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Powersupply is now finished. Total of 4 mots primaries in parallel secondaries in series. Ballasted with shorted mot. Input power 3kW, output voltage 7kV (7061V to be exact). Will hit over 8kV as soon as i get proper ballast (now primary current is 13amp max, 16amp breaker can take 22-23amps fine) Because of overballasting transformer primary hits only 196V (240V line).
Few pics (missing safety gap. EMI line filter will be on different board with ballast)
Tomorrow 200mm pipe will start turning :)
..And when you have high voltage transformer it is good to burn some sticks:
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Im not sure yet, but wiring will be as thick as i can found from my garage (something between AWG0 to AWG2) and secondary will be AWG23 copper on 200mm pipe about 1200 turns
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I wouldn't bother using heavy wire on the primary tank. If you take some time to calculate the skin depth of the RF currents it will be a few mil's so its not going to get to the middle of the wire.
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
argh, i just realized that the wire i bought as AWG 23 (0.57mm) measures with lacquer only 0.52mm so it is more likely AWG24 :(
With 0.52mm wire actual mm/turn will be around 0.6mm -> 1300 turns makes 800mm (31½") I think that is still tall enough to prevent self-hits with large top load? Will see about that :)
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
I enjoy making tall secondaries. While they are slightly more work to create, they certianly work to prevent primary to secondary strikes. I haven't had one yet even with high kW runs.
I used 6AWG cable on a 92nF 45kV bank and it gets quite warm after several minutes. So I switched out that wire for 2AWG and its cool to the touch.
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
Hazmatt_(The Underdog) wrote ...
I wouldn't bother using heavy wire on the primary tank. If you take some time to calculate the skin depth of the RF currents it will be a few mil's so its not going to get to the middle of the wire.
Well, experience tells me otherwise Hazmatt... when you are pushing large amounts of pulse current through a small wire you are bound to get heating. The temperature difference between running 6AWG and 2AWG on a high wattage tesla coil is remarkable. I'd use 4AWG minimum when running any system over 6kW - just for the tank supply/ primary connections.
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1st timer with Tesla Coils (coil kicks ass)
