Hi NathanUnfortunately, you are the proud owner of a old oil-kraft-paper dielectric Power Factor Correction (PFC) capacitor that is impregnated with PCB's. Pyranols are GE's trade name for a variety of PCB's. As you are probably aware, PCB's haven't been used in capacitors since the early 1980's. Most liquid-impregnated capacitors made between 1930 - 1977 contained PCB's. Large PCB-filled capacitors should be avoided, since once you buy it, you are now responsible for its environmentally-safe disposal as well.
PFC caps are rated in KVAR at a given voltage and line frequency. You can convert KVAR ratings to capacitance:
C = 1000*KVAR/(2*Pi*F*V^2) = 11.5 uFIf yours wasn't a lossy PCB-filled paper-dielectric cap, it might be worth disassembling it and rewiring the capacitor rolls so that they were connected in series. Once apart, you can also disconnect the internal bleeder resistors. By choosing the right PFC cap, it is possible to create a HV pulse capacitor that has a more useful voltage and capacitance rating for Tesla coiling. This has in fact been done in the past by some coilers, starting with newer polypropylene-foil PFC caps. However, it is a VERY messy job, and is really not worth the effort unless you're desperate. MMC's are much easier, are self-healing, and your capacitor bank is also easily repairable.
Sorry and best wishes, Bert -- Bert Hickman Stoneridge Engineering http://www.capturedlightning.com *********************************************************************** World's source for "Captured Lightning" Lichtenberg Figure sculptures, magnetically "shrunken" coins, and scarce/out of print technical books *********************************************************************** Nathan Woodhull wrote:
I recently aquired a very large capacitor and wondered if it would have any use in a Tesla Coil.General Electric Pyranol Capacitor,#H147952,KVAR 25,Cat.#13F138,2400V60cy.,Ph1.No Farad rating is listed.Thanks,Nathan Woodhull ________________________________ From: "tesla-request@xxxxxxxxxx" <tesla-request@xxxxxxxxxx> To: tesla@xxxxxxxxxx Sent: Sunday, November 18, 2012 2:00 PM Subject: Tesla Digest, Vol 61, Issue 12 ----- Forwarded Message ----- Send Tesla mailing list submissions to tesla@xxxxxxxxxx To subscribe or unsubscribe via the World Wide Web, visit http://www.pupman.com/mailman/listinfo/tesla or, via email, send a message with subject or body 'help' to tesla-request@xxxxxxxxxx You can reach the person managing the list at tesla-owner@xxxxxxxxxx When replying, please edit your Subject line so it is more specific than "Re: Contents of Tesla digest..." Today's Topics: 1. Audio Modulation of Class E tesla coil supply (Rishi Naidu) Hi I am trying to make a class E singing Tesla coil. I am almost done with getting some sparks from the coil by driving it through the function generator. Can some one help me on how to modulate my bus voltage of my class E amplifier based on an Audio signal. My supply voltage is around 150 V DC. Thanks _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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