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4hv.org :: Forums :: Tesla Coils
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60Hz SRSG Capacitor Match

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coillah
Mon Oct 20 2008, 11:22PM Print
coillah Registered Member #1517 Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
My choosen capacitor value is 7.5nF. I am going to build an SRSG at 120 BPS.

What is the equation to determine the new capacitance?
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coillah
Tue Oct 21 2008, 06:51AM
coillah Registered Member #1517 Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
I suppose I could find how energy could be transferred into the MMC in a given amount of time and relate that to my BPS somehow... but if anyone has a formula that'd be nice...
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TheBoozer
Tue Oct 21 2008, 06:54AM
TheBoozer Registered Member #1535 Joined: Wed Jun 11 2008, 11:37PM
Location: Northeastern Pennsylvania - USA
Posts: 117
Capacitance = (1000/(6.2832*(Voltage/Current)*Frequency))

This I believe is the formula to match a capacitor to a transformer. I think you need to provide more info before your question can be answered. Unless I misunderstood the question...
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Hazmatt_(The Underdog)
Tue Oct 21 2008, 08:10AM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I'm not exactly sure what you're asking here either. If you know the impedance of your transformer, the short answer is approx. 1.4-1.5x the resonant capacitence calculation.

The long answer is this: Link2
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coillah
Tue Oct 21 2008, 02:50PM
coillah Registered Member #1517 Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
There is a formula on this page for determining the optimal C for a given NST power source. There is a second equation which optimizes the that value of C for a synchronous rotary spark gap running at some BPS. That equation is written for 50Hz I need one for 60Hz.

Thanks!
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Bamacoiler
Tue Oct 21 2008, 03:59PM
Bamacoiler Registered Member #1628 Joined: Wed Aug 06 2008, 08:48PM
Location: Huntsville, AL USA
Posts: 95
First of all what are the ratings of the nst?
This could help determine correct c at 50Hz.
Link2

I think it should be as Hazmatt said whatever you figure using the nst's ratings with the equation for 50Hz from deepfriedneon times 1.4-1.5. If I'm not mistaken the formula from deepfriedneon is for resonance.
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coillah
Tue Oct 21 2008, 04:43PM
coillah Registered Member #1517 Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
Sorry please allow me to make this more clear.

On THIS site: Link2 cheesey

There is an equation which optimizes your capacitance for a given NST configuration, line frequency and BPS (SRSG). This equation was made for a 50Hz line. I need to figure out what the coefficient (150 in the case of a 50Hz line) should be for a 60Hz line.

The equation comes from how long it takes to charge the MMC.

NST is 15kV and 30mA
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