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Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Dr. Kilovolt wrote ...
Wee big arcs! They're like with my dual resonant MOTs with 6 capacitors, with the difference that mine start smoking in 30 seconds
I will find out how long arc will be when all 12 start smoking
Just got some heavy cable and 250amp 3~ switch
EDIT: 20kVA arcs were extremely bright so i had to heavily under exposure those shots to get arc visble. In reality room is not dark at all and arcs are so birght that you cant really see them.
EDIT2: remember kids, running mot stacks with resonant capacitor is cheating
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Still havnt got that stupid transofmer oil i have been waiting for...
Almost everything is now done. I took some videos about this thing in action @ 20kVA (~30amp primary current). It can run like forever with this setting, im just slighly over mot ratings.
some normal arcing
burning wood
When i get that oil i will try this stack unballasted from 3x125amp line. I should draw at least 100amps per phase
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Update 5.4.2009
Suicide run (which ended up being suicidal)
- Unballasted, deshunted mots (12x) - Powered directly from electric panel 3x250amp main fuses -> 3 x 125amp fuses -> 2x63amp 3ph automatic breakers - New 15kV 6A rectifier under tranny oil (made from 90x 1kV 6A diodes) - Primary current under load 125-126amps for each phase - Secondary open circuit voltage 10.7kV and short circuit current 8.5-10A
Got almost perfect current sharing with this layout
Whole setup. Rectifier is in green can under transformer oil to keep it cool.
And some arcs. I will make HD video soon
Low quality video
Friend of mine was operating main swithc and wathing if anything goes wrong... and it did. I had first accidental MOT failure in my life. One mot decided to turn into plasma ball and fried 2 other mots. So 3 dead ones and lots of smoke. Stack is dead but this project is still alive and kicking.
Arcs were pretty good for being non resonant MOT stack
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3 Phase HVDC supply with MOTs
