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Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
With inductive ballast and AC resonant charging in a conventional TC you could expect that transformer to charge the tank cap to something in the region of 90kV. As you said, it would need a good cap and RSG for that voltage!
You could also surely push the 10kVA figure to at least 30kVA for short runs based on the fact that such a large mass of oil, iron and copper isn't going to heat up quickly.
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
GeordieBoy wrote ...
As you said, it would need a good cap and RSG for that voltage!
I may have *implied* that, but I didn't *say* that Actually, this voltage calls into question some basic assumptions about gaps. It may be, for example, that static gap viability is restored at this voltage due to the drastically reduced peak currents. However the gap would require careful design to provide for consistent firing voltage, I expect. Or perhaps Terry's SISG is an option.
Consider that, at this voltage, a 120 bps break rate can provide for 5kVA with only a 30nF primary cap. Assuming a coil frequency of 50kHz, peak primary current would be somewhere in the neighborhood of 350A. That's "nothing". With the SISG option, I could probably use IGBTs far slower and lower-current than what Terry originally designed around. Especially if I consider that the SISG loves break rates above 120 bps, in which case I might correspondingly lower the primary capacitace and increase inductance, thereby further decreasing the peak current and slowing its rise. At this point, the other SISG parts (outside of the IGBTs) would probably dominate the total cost, but with how many I'd need, I might start hitting some price breaks
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
rp181 wrote ...
thats amazing, on the green box near my house, the sticker is blank =(
If it's a sticker, it probably isn't the nameplate. The nameplates are usually little aluminum placards that are riveted or welded onto the back of the transformer, or onto the mounting brackets (common on pole pigs).
Registered Member #1159
Joined: Fri Dec 07 2007, 02:10AM
Location: Hudson Valley of NY State
Posts: 84
Holy crap, Batman.....that's one helluva pig . I've bee watching those on ePay for a while now. I just don't have the room for something that big. Too bad, cause It's not that long a drive for me. Have fun with that monster & be sure to post pics when you get it fired up.
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Up until recently, I could get pigs locally for very cheap. I'd never imagined shipping one, much less an unusually heavy one and from all the way across the coutry! But the specs on this sucker were too unusual to pass up.
Although I'd normally recommend folks talk to D.C. Cox if they want a pole pig (14.4kV 10kVA units for $125-$150 and he even ships for free to some places), I think this Belyea Power operation might prove to be a good source too, especially for folks nearby (not me!). They've parted with a few units over the last several months, all either unusually large or unusually high-voltage, and all very inexpensive. Even brand new, as in my case. Keep an eye on them!
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34.5kV pole pig
*hides in a hv resistant bunker*
Actually, this voltage calls into question some basic assumptions about gaps. It may be, for example, that static gap viability is restored at this voltage due to the drastically reduced peak currents. However the gap would require careful design to provide for consistent firing voltage, I expect. Or perhaps Terry's SISG is an option.