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Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Hey
Im fairly new into HV, but got some years of experience with normal electrics, so I know most of the basic stuff, but I can still handle to confuse myself and setting a few things on fire :D
My beef here is to get some HV out of this toroid transformer, and I was wondering if I could provide it with 230 VAC on the secondary side, and thus receiving 4600 VAC on the primary side.
The primary windings are 20AWG (0,5square) and can approx conduct 7A, the secondary looks like 11AWG (4square).
the resistance in the secondary winding is 0,6 ohm, and I would like to put 230VAC through it, but I need so find the inductance to find out wether it will burn or what. But how do I determine L without knowing XL?
maybe Im just running in the dark here, as I said I confused myself and need some help :)
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
You can not do this, as transformer cores have rated maximum volts per turn (at a given frequency), beyond which the core starts saturating, inductance drops, and very large currents flow.
You could probably get those 4600V from it if you ran it at a high frequency (50*4600/230= at least 1KHz) but then the core would start heating up very fast, not to say that the 230V winding would probably arc over internally with 4600V across it.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Plasmaddict wrote ...
You can not do this, as transformer cores have rated maximum volts per turn (at a given frequency), beyond which the core starts saturating, inductance drops, and very large currents flow.
You could probably get those 4600V from it if you ran it at a high frequency (50*4600/230= at least 1KHz) but then the core would start heating up very fast, not to say that the 230V winding would probably arc over internally with 4600V across it.
Could I remove one of the windings and make a new one from some wire like Ive seen described with MOTs or flybacks?
Registered Member #575
Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
I would rather use that nice transformer to make a big ass power sluppy to drive a flyback transformer (Those you find in CRT screens) Or you could series two microwave transformers.
But always remember; These things can be very dangerous so always be very carefully.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Ace7one wrote ...
I would rather use that nice transformer to make a big ass power sluppy to drive a flyback transformer (Those you find in CRT screens) Or you could series two microwave transformers.
But always remember; These things can be very dangerous so always be very carefully.
I also have an ignition coil from a ford lying around, maybe i could use it for that, would just have to spend some more time rounding up the materials for a driver circuit for it, thats why i tried to go with simple scrap HV to start with.
Im aware of the dangers of live wires, I am an electrician and have had my electric shocks :)
Im still trying not to salvage my microwave owen since I like something to eat once in a while, and NST seems impossible to find at a decent price in denmark.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I agree with Ace7one on this - it would be a shame to ruin such a useful-looking transformer trying to make it do something it wasn't designed for.
Much better to use it to power experiments with flybacks, ignition coils and so on - more complex, it's true, than the idea you had in mind, but by far the easiest doorway into into the HV world.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Hi Mads
Being a dane myself, I can confirm the troubles in finding suitable high voltage transformers, like the ones you see americans using.
The best you can get are OBIT`s. Oil Burner Ignition Transformer, the ones sitting on a oliefyr. 12kV/18~20mA
Danfoss even make a solid state version, which puts out 60mA @ 12kV, 20kHz inside the 50Hz envelope. Nice when it is rectified, and smaller than a box of household matches.
Don`t miss out on the MOT`s either, they are very good, and once you get your eyes trained on it, you will see scrap ovens everywhere. Start looking around when there is storskrald.
You can make your own, although there are no easy accessible source of suitable high voltage cores at the moment.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Finn Hammer wrote ...
Hi Mads
Being a dane myself, I can confirm the troubles in finding suitable high voltage transformers, like the ones you see americans using.
The best you can get are OBIT`s. Oil Burner Ignition Transformer, the ones sitting on a oliefyr. 12kV/18~20mA
Danfoss even make a solid state version, which puts out 60mA @ 12kV, 20kHz inside the 50Hz envelope. Nice when it is rectified, and smaller than a box of household matches.
Don`t miss out on the MOT`s either, they are very good, and once you get your eyes trained on it, you will see scrap ovens everywhere. Start looking around when there is storskrald.
You can make your own, although there are no easy accessible source of suitable high voltage cores at the moment.
Good to see a fellow dane on the board!
Cheers, Finn Hammer
Hey Finn
Think I will focus on the OBITs then, since having some MOTs together in oil doesnt go well with a 1 room appartment, got a friend that repairs stuff to gather MOTs and their capacitors for me, so maybe some day there is enough of it for some projects. I will have to wait with those though, with the high current on the secondary I need some experience with something lesser lethal I think :)
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
HFsstc-freak wrote ...
is our website.
Those strip wound HEXA-Transformer cores kept my eyes glued to the screen for some time.I`d give an arm and a leg for some close up pictures that could reveal the winding technique of them.
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Reversing a transformer
