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Forums
4hv.org :: Forums :: High Voltage
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DIY high voltage & high power transformer

 1 2 3 4
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Kizmo
Sat Jan 26 2008, 12:41PM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
jmartis wrote ...

Kizmo, that's scary, where did you get that core? O_o

And what do you plan to use the xfmr for when it's finished?


That was main xfmr from 8kW UPS (3x 380/415V -> 3x 129V @ 7820VA). It was 3-phase transformer but i modified it by cutting center 'leg' away from each lamination to make more space.

http://koti.mbnet.fi/kizmo/misc/muhennin/210108/purettu.jpg
http://koti.mbnet.fi/kizmo/misc/muhennin/220108/leikkaus.jpg

It will be used as multi-purpose high voltage transformer (arc pulling, jacobs ladders, burning stuff etc) and maybe with spark gap teslacoil. Secondary will be done with .3mm magnet wire. I would be a lot easier to just buy PT or small PIG but they are *really* hard to obtain here and almost impossible to buy because of health and safety regulations.
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Logan Kennedy
Sun Jan 27 2008, 12:33AM
Logan Kennedy Registered Member #1103 Joined: Mon Nov 05 2007, 06:02PM
Location: Houston
Posts: 80
Wow, that thing will be a beast when complete. Very dangerous indeed.
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Dr. Dark Current
Sun Jan 27 2008, 07:54AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
wrote ...

Recently i acquired even bigger core, this time it has a lot of space for windings. This will be the final thing:
http://koti.mbnet.fi/kizmo/misc/muhennin/220108/kokovertailu.jpg

It measures outer dimensions of 25cm x 25cm x 8cm and has cross-section area of 40cm^2..
I've just read this, with 40cm^2 the core is good only to about 1.6KVA continuous on open air. Maybe a little more with active cooling.

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Kizmo
Sun Jan 27 2008, 10:42AM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
I know the math, but that is weird, i have one 4kVA transformer (200V -> 606V) which has 38cm^2 core confused
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Dr. Dark Current
Sun Jan 27 2008, 12:18PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Kizmo wrote ...

I know the math, but that is weird, i have one 4kVA transformer (200V -> 606V) which has 38cm^2 core confused
and is it for continuous use? I have one xfmr from 300W UPS which has ~10cm^2 cross section...



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Kizmo
Sun Jan 27 2008, 12:24PM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
I have no idea. I will 'overpower' this core heavily because it won't be running for hours.. never
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