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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Aaron, I'd like to try this experiment myself; IF you get one and dis-assemble it I'd be very willing to pay postage to here (UK) for a nice string of capacitors. For my present resonator I'd LIKE 1m (39") of capacitance (new unit !)
I dare say there are others here who would also love capacitors for postage costs - especially from such a generous guy as yourself
If not, eBay is an option for you to get cash for other purposes.
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
I'll go down there and have another look and ask if they'd just let me gut 'em. I don't think I have room for the porcelain. At least, not more than one! If I can get boatloads of doorknobs for uber-cheap, I'll report back. I'd be happy to just cover my costs if folks want them. I probably wouldn't be able to guarantee they all work, though!
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Wow, Christopher! You guys really scored a boatload of caps there!! I hope I'm as lucky! Those red ones look a bit beefier than what my friend got out of the last one of these he dissected. He got hundreds of them, but they were 20kV and 500pF. "Little green guys." Tragically, he sold most of them on eBay before I knew him. He's been contemplating building a TC MMC out of what he's got left, but hasn't done so yet.
I'm heading down to the salvage yard this afternoon and will report back. Will also be looking for some station post insulators. Last time I was there, I bought a bunch of random insulator-looking things at $5 a pop, and they later turned out to be 21kV lightning arrestors. Whoops! I haven't yet figured out how to get them open non-destructively, so they may become safety gaps
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
(bump)
Well, I went down on Friday and bought two of these. For only $50 each! I just couldn't turn them down for that price. They look almost new, and I was told they ought to be in fine shape; they were just taken out of service as part of routine maintenance. I looked all over them and couldn't find a part number, however. They were selling a couple of whole capacitive voltage transformers too ($250 ea) which use the same caps as I'm getting. In fact, I think the ones I'm getting were originally stacked on these PTs to double the voltage. I'll get the part number from the PTs and see if that leads me to the capacitor info.
The units are made by ABB. I pulled up the coupling cap literature from ABB (production units only) and they don't really reveal too much about the internals of the thing. Plus who knows whether the modern docs are any indication of what's in these older ones.
I'm picked them up this coming Friday (earliest I could trick one of my coiling friends with a pickup truck to help me haul them away), and will keep you all posted on what I find. I found some 6" casters at a local junk store yesterday, so whether or not I can use the guts of the thing, I definitely plan to put it on wheels and see about winding an oil-immersed TC secondary in it. That would sure be spiffy!
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HV coupling caps: Good for anything?
