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4hv.org :: Forums :: High Voltage
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Resonant MOT arcs

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Nik
Tue Mar 25 2008, 11:26PM
Nik Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
What country are you in, it might be possible for you to do it yourself. In canada you can legally do some electrical work yourself and it might be the same where you live.
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Zum Beispiel
Wed Mar 26 2008, 12:37PM
Zum Beispiel Registered Member #514 Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
It's Finland and here you are only allowed to do minor electrical work, like making an extension cord or stuff like that. No messing with the fuse box!

But damn, those are some impressive arcs amazed

Hmm, I've got some mots and caps, might have to try this some time...
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c4r0
Wed Mar 26 2008, 01:29PM
c4r0 Registered Member #151 Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
Kizmo wrote ...
i have 250A main breakers but no more than 16A outlets
Why not to parallel two or more outlets? smile And how many MOCs have you used on that photo?
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GluD
Wed Mar 26 2008, 01:45PM
GluD Registered Member #1221 Joined: Wed Jan 09 2008, 06:17PM
Location: Odense, Denmark
Posts: 196
*gasp* this is teh sex! :P
But does the caps have to be the same type/ratings or is it fine if theyre just from a MO?
'cause ive got around 7 MOC's but not 2 of the same type/ratings although theyre all 2100v and around 1µF.

cheers
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uzzors2k
Wed Mar 26 2008, 02:42PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
My caps are odds and ends, and they've held up fine. MOCs can withstand the voltage with a slight margin, and the resonance action doesn't seem to require fine tuning.
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GluD
Wed Mar 26 2008, 03:11PM
GluD Registered Member #1221 Joined: Wed Jan 09 2008, 06:17PM
Location: Odense, Denmark
Posts: 196
Cool, i might try it someday then :o
Got all the stuff but im just abit scared, those arcs looks really crazy O__O
..gonna need one hell of a chicken stick before i even dare puttin the stuff together.
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Dr. Dark Current
Wed Mar 26 2008, 05:19PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Today i bought another 2 MO caps, and as promised here are some captures and a video:

1206551877 152 FT38015 Motarc1 1206551877 152 FT38015 Motarc2

1206551877 152 FT38015 Motarc13 1206551877 152 FT38015 Motarc14

1206551877 152 FT38015 Motarc15



Link2


enjoy



J.M.



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uzzors2k
Wed Mar 26 2008, 07:00PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Madness! They must be approaching a meter by now. I have to look for some caps too, this is more fun than I thought. smile
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c4r0
Wed Mar 26 2008, 08:43PM
c4r0 Registered Member #151 Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
I have 12 of them at the moment. How do you think how many should be the best for this circuit (what capacity)?

Uzzors wrote ...
MOCs can withstand the voltage with a slight margin
Steve has checked it and he writes that they fails at about 10kV DC. He has been charging them up to 8kV in his can crusher - Link2
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Dr. Dark Current
Wed Mar 26 2008, 09:12PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
c4r0 wrote ...

I have 12 of them at the moment. How do you think how many should be the best for this circuit (what capacity)?
I think three parallel caps for each MOT are best for big arcs. With four you may get a bit thicker and marginally longer arcs but the resonance starts to fall away and the MOTs get darn hot.

I would put 3 mots in series (if you have) and use 9 caps in 3x3 configuration... You might need to disconnect the MOTs from their cores and put them under oil to avoid flashovers, I have no idea how well would they stand it (remember the resonant voltage is ~3kV per MOT) and of course you would need a storng breaker (~25A at 230V)



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