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Registered Member #1822
Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
This post is about NSTs not 'Coils but, the question is crucial to the construction of my second 'Coil. Please no whiners I felt this was the best place.
When selecting parts for my MMC I need to know the peak voltages that I will be dealing with on the NST's. I made up some formulas that sound like they should be right and I need your guyses input on my output. 12KV:120V=100:1 Peak to Peak Voltage on mains line = 170V so 12KV/120V=17KV/170V From the series of formulas that I made up the peak voltage should be 17KV. My self esteem is low today so dont be too harsh. If this is not correct how do I find the correct peak or at least select the proper MMC?
Registered Member #1535
Joined: Wed Jun 11 2008, 11:37PM
Location: Northeastern Pennsylvania - USA
Posts: 117
Nameplate voltage rating is usually RMS voltage. So, multiply that by the square root of 2. This is roughly 1.41 so, 12kv * 1.41 = 16920. This is only peak, so multiply that by 2 and you get the peak to peak voltage. Which comes out to 33,840v. So, build an mmc that can withstand 34kv or better.
Peak to peak on 120vac is around 340v by the way... Peak is around 170v.
Registered Member #1535
Joined: Wed Jun 11 2008, 11:37PM
Location: Northeastern Pennsylvania - USA
Posts: 117
You need a cap that is rated peak to peak because it will be subjected to sudden voltage reversal. The 34kv is a DC rating. Typical 942C capacitors have a DC rating of 2kv, so 17 in series would be a safe measure. People sometimes underate their MMC banks, and it works, but I prefer to stay within manufacturerers rated limits....
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Peak Voltages
