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4hv.org :: Forums :: Tesla Coils
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DRSSTC current Limiting
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MRacerxdl
Tue Aug 09 2011, 02:08PM Print
MRacerxdl Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
 		I was thinking those days, what actually limits the primary peak current at a DRSSTC?

Mine DRSSTC runs at 250A Max, and doesnt get over it (even if I remove the secondary, the primary current didnt rises more than 250A).

Its only the resistive losses of the wire? I have 10 turn 2,5mm² wire at primary, so the resistive losses are a bit high.

As my current doesnt reach more than 250A, I dont use OCD.

Is there anything else that limits the current?

Thanks!
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Inducktion
Tue Aug 09 2011, 04:20PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		Resistance is usually the only thing that limits current, the whole resonant thing is what gets rid of impedence. That's how it can have such huge amounts of current flowing.
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dude_500
Tue Aug 09 2011, 06:56PM
dude_500 Registered Member #2288 Joined: Wed Aug 12 2009, 10:42PM
Location: Cambridge, MA
Posts: 179
 		The reason you might want an OCD, is that right now say you're running 250A at x volts on the bridge with no secondary... if you then add the secondary and get it perfectly tuned, that current at the same x volts will probably drop to 100A or even less. At that point, you could crank the voltage way up to get back to your 250A limit. But at this voltage, if the secondary fell off/some physical fault/etc (or even huge detuning from a ground strike), you'd suddenly be at 500A+, and would be very glad you had an OCD.

If you never exceed your bridge's current capacity with or without a secondary and never exceed that bridge voltage, you're right that there's not much point to an OCD.
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Dr. ISOTOP
Tue Aug 09 2011, 10:39PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
 		Your interrupter ON time determines your maximum primary current for a given voltage; increasing it will let the currents ring up higher.
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MRacerxdl
Fri Aug 12 2011, 06:11PM
MRacerxdl Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
 		Yeah I know that, but here, I dont get more than 250A independently of what spec I use.

My tOn is usually 240us, but after the first 100us the current doesnt get more than 250A.

And with or without the secondary, the current is 250A after about 100VDC at bus. I doesnt increase anything after that.

But I know in theory, that Ground Strikes, Bad Tune, or even voltage spikes can increase the peak current at primary, so I really dont know what is going on on my bus :/
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