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Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
hi,
Since im interested in high voltage, i wanted to build my own high voltage transformer, but never got the right material to do it. a few weeks ago i came across a relatively big EI130b Core. i had no use for it cause it was a industrial 400volt transformer. it was lying around for about two weeks before i decided to unwind it and build my hv transformer.
the secondary coil is wound out of 0,3mm wire, every 500 turns i insulated it with a sheet of paper and varnish. every 1000 turns a layer of transformer isolation foil (PP) the whole secondary has around 11000 Turns. on 230Volt input i have a secondary voltage of around 6,5kV. one side of the secondary is connected to the core like a mot.
heres a small video at 100volt input power
as you can see, the arc is very very powerful, around 500mA or more. the whole thing only get slightly warm. at 230volt input i need a ballast to prevent the breaker from tripping while drawing an arc. tommorow i´ll post a few pics of the building progress, insulation etc.i never thought that its so easy to insulate such a high voltage
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
20A ; core is obivously saturated heavily, it is rather too small for 4000 wats and this is a good way to blow your transformer apart. Its obivously not for 220V any more, in film very loud buzzing can be heard, you must find some edge where core saturates and run on that voltage otherwise huge amount of power will turn into heat and melt your primary...
Registered Member #87
Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
Woah, calm down there Omicron, Reachings knows what he's doing. Check out the old board. Anyhoo, hows about a pic of the running device for those of us who aren't so lucky with AVI's?
(EDIT: Totally missed that pic. Incredible results..)
Registered Member #101
Joined: Thu Feb 09 2006, 08:12PM
Location: Wisconsin
Posts: 41
nice!
how can you figure out how many turns to wind for the primary? i have a huge core laying around that was from a big battery charger. it must have been from the 60's or something, since the insulation on the wires is falling off. the primary was wound around the secondary, it was, i think 10 AWG and the secondary is 6 AWG. the wire is pretty burnt so i removed it. now i would like to rewind it for 120v input (with finer gauge wire like 12 or 14) and 50 volt out , and taps every 5 volts. the core is 5-3/4" x 6"
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Selfwound 50hz HV transformer
; core is obivously saturated heavily, it is rather too small for 4000 wats and this is a good way to blow your transformer apart.
