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RE: Wild caps...and shopping :)
My very first "large" coil cap was one of these types of caps (only it
had a greater VAR rating and was about 20" high). It was rated at 13.8kv
if I remember correctly and we used them in a series/parallel
arrangement to support the 115kv transmission system). I cut the top of
it off, and found 20 rolled caps inside, all in parallel with bleeders
across them. I cut the connections and re-wired them all in series
(still in the SS casing). It came out to 168nF (started out at 3uF I
believe), which allowed me about 4 turns on my primary. It worked real
well for what it was.
> From: Tesla list[SMTP:tesla-at-pupman-dot-com]
> Sent: Thursday, August 10, 2000 7:39 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Wild caps...and shopping :)
> Original poster: "Gomez ADDams" <gomez-at-netherworld-dot-com>
> on that fateful day 8/10/00 12:14 PM, Tesla list uttered:
> > One of the things we noticed on our little jaunt was a large bank of
> > capacitors used next to the private substation for the plant. I have
> no idea
> > of ratings or whatnot (I have to go back tomorrow), but they were
> about 4W X
> > 10L X 6D and had 2 HV bushings. These are probably rated for at
> least 2000
> > and at most 15KV and I was woindering if they would work for TC
> duty. Ideas?
> > Terry?
> These are almost certainly PFC caps, very common in the substations of
> consumers, since their loads tend to be all inductance (motors,
> transformers, etc). They will almost certainly be much, much too high
> value for coiling. But if those dimensions are inches, and if they're
> 1uF or so, you could perhaps put ten of them in series for a big coil.
> know someone in Longmont who did that with utility PFC caps.
> - Gomez
> aibohpphobia: fear of palindromes