Winfield Hill wrote:
Ralph Barone wrote...

Tim Williams wrote:
"Bert Hickman" wrote in message
...
I have a 280-pound capacitor, four of them in fact.
Well, they must weigh something in that vicinity.
They cost $500 each, including pallet shipping.

The physically largest capacitor I ever saw in person was a PIO type
rated IIRC for a couple of uF at several kV; it weighed about as much as
a bowling ball and was about the same size


Our 170 pound energy discharge capacitors, each 70 uF at 12 kVDC:
http://capturedlightning.com/photos/...ps/MAXCAP3.JPG

I've worked with capacitors bigger than that, although I think they were in
sections so maybe it's not technically true to say "bigger capacitor"
(singular). :^) Ratings were around 100s uF, 2000V, lots of amps.

Tim

66 uF, 276 kV, 3000 A
but that was an aggregation of multiple cans.

Did the series caps have voltage-equalizing mediation?



This was an AC application (partially cancel the series inductance of a 500
kV power line), so voltage equalization wasn't a huge concern. The
individual cans did have bleed resistors inside, but those were to meet the
requirement that a can would have a safe voltage on it 15 minutes after
deenergization. The cans were also arranged in an H configuration with a
CT to measure the unbalance current between the four sections. If the
unbalance exceeded a critical value, the bank would be tripped out.