On Sun, 16 Oct 2005 15:49:54 -0700, Eric R Snow
wrote:
On Sun, 16 Oct 2005 22:19:19 +0000 (UTC), Cydrome Leader
wrote:
Eric R Snow wrote:
On Sat, 15 Oct 2005 23:26:26 -0700, "william_b_noble"
wrote:
high voltage mica caps aren't hard to find, I have a 30,000 VAC mica cap
sitting here at this moment - it's about 8 inches X 6 inches X 12 inches,
with a 8 inch insulator on top, the case is one terminal, the other is on
top of the insulator.
I suspect your TIG welder needs a lower voltage.
Mica has particular dielectric benefits in certain frequency bands - and oil
dripping out is not a real problem, jsut remove the cap, refill with oil and
seal it again. use mineral oil if you can't find capacitor oil.
Capacitor oil kinda sounds like skyhooks and file grease. I'm sure
it's not. I'll look for it and try to see why the things are leaking.
Will oil loss make the capacitance lower?
Pics and part numbers.
I deal with high voltage capacitors and would love
to help, but you need to provide info on the part itself.
I thought I'd already posted a message concerning pics in the dropbox.
I will be taking pics tomorrow and posting them in the dropbox. In the
meantime here's the info on the capacitor:
GAMO TYPE
MICA CAP
Miller Electric P/N 31-602
And from the manual:
Capacitor, mica .002 uf 6000 volt
The capacitors themselves have places on them for Amps, Volts, MFD,
but these spaces are blank. I hope the info above will help.
Thanks,
eric
See if you can find a place that services electronic air cleaners --
the kind that go into the furnace. Those have 6KV to 10KV caps in
the .001 to .002 uF range. Two mfrs are Honeywell and Trion. I
used to know a lot of guys at HON but that was a while ago now.
TV sets used to have 500 pF (.0005 uF) 20KV "doorknob" caps.
Here is a surplus place that has transmitting micas, 2000 pF (.002
uF) 6KV for $99. (Ow!)
http://www.surplussales.com/Capacito...ansP-ECap.html
Transmitting micas are much more robust than you need because they're
made to handle high RF currents. However, they certainly would work.
Cornell-Dubilier (CDE) makes a mica paper cap, partnumber:
KVX10S222K0T001 that is an .0022 uF 10KV cap. Here is a list of CDE
distributors:
http://www.cde.com/distributors/distsites.htm
Here is a selection of 10 mica doorknob caps on ebay:
http://tinyurl.com/d7a2y
No telling what the values will be, but they'll all be at least 10KV
and you probably can parallel some of them to get close to 2000 pF
(.002 uF).