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Forums
4hv.org :: Forums :: Tesla Coils
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PFC Capacitors

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Ultra7
Fri Jan 18 2008, 03:25PM Print
Ultra7 Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
Teslamap recommends a PFC Cap across my NST.
I wonder, does the Cap have to be rated at my NST's voltage, or should it be higher or does it even really matter?

My NST is 7500V/30mA.
The program recommends a 49.3 uF cap but nowhere in the program does it say what the voltage rating should be.

I'm looking at this cap (50 mfd x 440 VAC Oval Motor Run Capacitor HVAC - R), but the voltage rating is only 400V.
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Bender
Fri Jan 18 2008, 04:18PM
Bender Registered Member #1027 Joined: Tue Sept 25 2007, 01:44PM
Location: Poland
Posts: 15
PFC capacitor goes to primary side of your transformer so it has to be rated for your mains voltage :)
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Ultra7
Fri Jan 18 2008, 07:15PM
Ultra7 Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
So that cap will work then, right?
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Dr. Dark Current
Fri Jan 18 2008, 07:55PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Ultra7 wrote ...

So that cap will work then, right?
Yes, but you don't need to use the cap for proper function of your coil; it is just to reduce the inductive current that you draw from wall.

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