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Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
Great video, I saw it on discovery a few weeks ago.
Given that it's been up for over a month, I doubt anyone will have it pulled. Just incase, someone could use a video downloader to save it to .FLV format, convert to .AVI and then upload it somewhere else.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
J. Aaron Holmes wrote ...
Neat video. Thanks for posting! I assumed it would be one I'd already seen, but it was actually much better than the one I'd already seen, which showed only the winding part of the process.
DaJJHman wrote ...
too bad they only test to 145Kv... as I have seen two pole pigs blow up already ^_^
The primary voltage figures in the hi-pot and impulse test goals for the transformer. 7200V pole pigs are usually tested to "only" 95kV BIL, for example. But "high BIL" is usually available as an option. I've got a couple of transformers with 200kV BIL ratings. But BIL won't necessarily save you from resonant overvoltages and other kinds of overvoltages seen during Tesla coil use (e.g., primary strikes) since BIL is a very short-duration pulse rating, generally given in uS.
Cheers, Aaron, N7OE
I was using the the voltage from the video where it stated tests for lightning, are you referring to something else?
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
DaJJHman wrote ...
I was using the the voltage from the video where it stated tests for lightning, are you referring to something else?
Nope, same thing. That's the BIL rating (BIL = Basic Impluse Level). BIL is printed on the transformer nameplate and is one of the basic features of the transformer that power systems engineers have to consider when deciding what transformers to use. For any given primary voltage, multiple BIL ratings are probably available. In an area with a lot of lightning storms, it may make sense to pay extra for transformers with extra high BIL ratings. 250- and 300kV are about tops for pole pigs.
Registered Member #1083
Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
Wow! Thats really cool! I never would have guessed that the low voltage secondary is actually just aluminum sheet. I guess I thought it was just heavy gauge copper wire. Now it makes sense why powering pigs in reverse draws so much current! You're almost shorting out the mains.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Andyman wrote ...
Now it makes sense why powering pigs in reverse draws so much current! You're almost shorting out the mains.
It doesn't make sense to me at all, if you have two windings with the same nuber of turns made using different winding techniques, why would one draw more current than the other?
Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
Andyman wrote ...
Wow! Thats really cool! I never would have guessed that the low voltage secondary is actually just aluminum sheet. I guess I thought it was just heavy gauge copper wire. Now it makes sense why powering pigs in reverse draws so much current! You're almost shorting out the mains.
your not shorting out the mains only if you pull the arcs, and this is beacause the gauges of wire a very large and the core is also very large and hard to saturate, and by the way any transformer even your little wall wart causes a short cuircut with the mains but for a VERY short amount of time until the core saturates
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
jovica93 wrote ...
Andyman wrote ...
Wow! Thats really cool! I never would have guessed that the low voltage secondary is actually just aluminum sheet. I guess I thought it was just heavy gauge copper wire. Now it makes sense why powering pigs in reverse draws so much current! You're almost shorting out the mains.
your not shorting out the mains only if you pull the arcs, and this is beacause the gauges of wire a very large and the core is also very large and hard to saturate, and by the way any transformer even your little wall wart causes a short cuircut with the mains but for a VERY short amount of time until the core saturates
I don't think that the core saturates in a wall-wort... I think it's just the inrush current because it's an inductor. If the core were saturating, it would draw a lot more current than if it weren't.
Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
Myke wrote ...
jovica93 wrote ...
Andyman wrote ...
Wow! Thats really cool! I never would have guessed that the low voltage secondary is actually just aluminum sheet. I guess I thought it was just heavy gauge copper wire. Now it makes sense why powering pigs in reverse draws so much current! You're almost shorting out the mains.
your not shorting out the mains only if you pull the arcs, and this is beacause the gauges of wire a very large and the core is also very large and hard to saturate, and by the way any transformer even your little wall wart causes a short cuircut with the mains but for a VERY short amount of time until the core saturates
I don't think that the core saturates in a wall-wort... I think it's just the inrush current because it's an inductor. If the core were saturating, it would draw a lot more current than if it weren't.
Registered Member #1083
Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
Oh, I see. Even though you're connect the mains to a strip of aluminum with virtually no resistance, the inductance keeps the current ballasted. Or something like that.
Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
Andyman wrote ...
Oh, I see. Even though you're connect the mains to a strip of aluminum with virtually no resistance, the inductance keeps the current ballasted. Or something like that.
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The making of a pole pig.
