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Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Very handsome construction, Neil. I love the photo where we see your transformer on the trolly and the power company's transformer on the pole in the background. Being used "properly."
Registered Member #2316
Joined: Tue Aug 25 2009, 03:04AM
Location: Bendigo, Australia
Posts: 107
Coronafix wrote ...
Zeus wrote ...
A pole pig in Aus. Will wonders ever cease.
Are you surprised that we actually have electricity here? We are a first world country you know, even if we weren't, pole pigs are everywhere.
Allow me to correct my statement. A pole pig available in aus which was bought for a price that was not stupendously high. I will never be in the postion to buy one as we are on solar power.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Looking at the transformer, the first thought was the primary is wound with small wire.It would be nice to know the DC resistance, but be careful, use an analog meter, and make a solid contact and before you switch the meter on or switch range, use a shorting switch, and open it to take readings.(having an apprentice measure secondarys with a meter was a common in the old days to cement in their mind by means of a belt of current the effect of self inductance with just a few hundredths of an ampere at less than 2 volts) Now find the inductance at 50 Hz with an AC ammeter and mains voltage (on the secondary!!) transpose Z= sqr(xL^2+r^2). Seeing that box of doorknob capacitors, I would avoid *any* possibility of resonating that secondary at 50Hz.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Zeus wrote ...
Allow me to correct my statement. A pole pig available in aus which was bought for a price that was not stupendously high. I will never be in the postion to buy one as we are on solar power.
Sorry Zeus, was being defensive. There seems to be more and more of us here in Oz, perhaps we will see the first Australian Teslathon not too far off.
MMC type caps, rated only 432 peak Amps, probably will not be able handle your peak pri currents for very long before they start failing.
You will be seeing 2,500 to 3,500 peak pri Amps, something usually reserved for pricy energy discharge type caps.
If you run up to the full 22 kV, then you will need Erms x 2.5 for MMC caps, ie, 55 kV DC rating per string, and they still won't take the high peak currents.
I do carry 0.1 uF (100 nF) 80 kV energy discharge caps if your search does not turn up anything. Contact me off-list for details.
Sorry for the slow reply to your comments, with xmas and new yr distractions have not had a chance to be on here much. I was able to get it going a few weekends ago, it was late Sunday night with a 2 hr drive still to get home, so did not get into tuning it up much, and still have a few bugs to fix up, but I was really pleased with how it ran. Unfortunately I never had time to get a whole lot of pictures of it running but have taken some still shots from the video I had going. I think once I finish getting it tuned up and a larger toroid on it, it should be a lot better.
Hazmatt_(The Underdog) wrote ...
For such a power beast, your toroid is probably vastly insufficient. You might want to get 6 more baskets so you can approximate a large toroid.
Thanks, after running it I really think you and the other people who mentioned toroid size are right, I will keep an eye out for some Aluminium ducting and try to make something a lot larger up
Zeus wrote ...
Coronafix wrote ...
Zeus wrote ...
A pole pig in Aus. Will wonders ever cease.
Are you surprised that we actually have electricity here? We are a first world country you know, even if we weren't, pole pigs are everywhere.
Allow me to correct my statement. A pole pig available in aus which was bought for a price that was not stupendously high. I will never be in the postion to buy one as we are on solar power.
I had tried for a very long time now to get a pole transformer, every time I asked a power company they told me they couldnt sell it to me, and around here you never see them laying around or for sale anywhere else, I was just lucky to have found a company who would sell them, and for a decent price.
Dr. Resonance wrote ...
MMC type caps, rated only 432 peak Amps, probably will not be able handle your peak pri currents for very long before they start failing.
You will be seeing 2,500 to 3,500 peak pri Amps, something usually reserved for pricy energy discharge type caps.
If you run up to the full 22 kV, then you will need Erms x 2.5 for MMC caps, ie, 55 kV DC rating per string, and they still won't take the high peak currents.
I do carry 0.1 uF (100 nF) 80 kV energy discharge caps if your search does not turn up anything. Contact me off-list for details.
Dr. Resonance
I'm hoping they do hold up, they seem to be the cap of choice for anyone building MMC type cap banks from what I have seen, if I do run into problems though thanks for the info I will keep that in mind.
This is the Tesla coil all set up ready to start its first run once it was dark enough
This shows a closer view, I am worried though about the strike rail sapping lots of energy out of it, but more worried about not having it, I have seen a few arcs come down and stike it
This is a close up of the synchronous rotaty spark gap
This is the finished power source and control panel, it works well
Not the best picture, just taken as a still from some video, when I have more time I will take some nice pictures of it and maybe with a few seconds exposure
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Pole Transformer
