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ferro resonance... would seem to imply that the core, interacting with induced alternating or pulsing magnetic field, has a magnetic resonance of its own at particular frequencies( most likely very high freq).
some guys at OU.com claimed getting headaches and such working on this area of the craft.
would be interesting though to see such an effect. more magnetic amplitude than the applied input produced.
so going further, maybe the freq of the effect could be related to the physical size of the core or thickness, like anything else, heavier/larger may lower the freq of operation, or the size or the particles the core is made of. the later might mean ultra high freq.
i can also imagine some very high 'over' saturation of the core thus the fields are no longer contained in the core. like power supply transformers, of which some could operate up around 150khz, you may see a copper strap around the transformer, that is a magnetic shunt to any magnetic field escaping the transformer, not only to keep that from interfering with other parts of near by circuitry.......
mags
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... by the way... I noticed the sound of the transformer in the videos isn't like in reality... kinda messed up...
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Hello fellow researchers
I noticed that in the video the experimenter is not using one AC capacitor but what looks like two DC electrolytic capacitors back to back which I often do. In my experiments I found a DC electrolytic capacitor can act kind of like a zener diode sometimes. A diode which blocks the current in one direction until it exceeds a predetermined threshold then starts conducting.
So when were using two electrolytic capacitors back to back and we have an over voltage spike the first series capacitor blocks the current until it exceeds the maximum voltage of the capacitor. The same series current then spills over into the second capacitor which adds in series producing a higher voltage which we see on the experimenters DSO. This higher voltage on the DSO does not appear on the source power meter which shows a constant 223v. It could be the RMS or averaging function ignoring the voltage spike.
This seems to be confirmed by the DSO wave form which transitions from a sine wave to a square wave of twice the voltage after the load is shorted. It may look like a square wave because the first capacitor blocks the current (voltage rise) then once the voltage threshold is exceeded it conducts (constant voltage or flat spot like a clipper device) into the second capacitor increasing the series voltage then finally dropping.
Sorry for the long winded description and this effect is not well known. Basically an electrolytic capacitor can act like a zener diode or clipper circuit if it's voltage is exceeded producing square waves and higher voltages.
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Hi Dann, it is pretty great you were able to do these experiments, thank you. The waveform, at least to me, looks like the core is being saturated as you say. I am not familiar with the theory behind ferroresonance, or what to expect it to do (except lowering inductance). If we can suspect it could be a gain mechanism, I'd say that attaching it to a battery (or another DC power supply) with an inverter, we could see if the current is drained from the power supply, or possibly generated by ferromagnetism. Maybe a simplified version would be switching a bipolar transistor at 50 Hz as it seems that you are able to achieve the ferroresonance effect at lower voltages.
Just the first idea that popped into my head on how to figure out if the effect is draining or gaining.
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may be good to have an emf meter around with this project.
mags
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09-05-2024, 03:32 PM
(This post was last modified: 09-05-2024, 03:35 PM by kapierenundkopieren.)
Hi kloakez.
I consider this experiment pretty easy to put together, anyone can do it given the components. It works with different transformers and capacitors your components need not to be some exact values, just approximately in the range where the magic happens. Yesterday I replaced the small transformer (230V to 15V) with a bigger one (220V to 110V) and got it to light a 230v 40W lightbulb. The consumption on the wattmeter was much higher than before (don't remember exactly). I coud even get a 100W bulb to slightly flicker - kind of ondulate at a really low frequency.
I see from the experiments I did, that there are at least 3 modes to the system and you get every of the 3 just by quickly shorting (sparking) the low voltage side (aka secondary in this case) of the transformer at the right time. If I spark it multiple times it gets in one of the 3 modes randomly every time i spark it.
The first is normal operating mode, the voltages and brightness of the bulb are as expected - normal.
The second is the ondulating - flickering mode, the sinewave looks like it has a lower harmonic added and slightly higher voltage and consumption, the bulb flickers.
And the third one is full blast ferroresonance, the voltage on the primary shoots up by 3 to 4 times, on the secondary as well and the bulb is bright as hell.
I recorded the second mode in one of the videos, but the phone camera did not catch the flickering.
Today I put together a circuit to drive the transformers from a battery, but the transistors I have are not powerful enough, they get hot even with a smaller transformer. So I got a 5W bulb to slightly flicker, but didn't wanna go into full blast ferroresonance. Will search through my stuff tomorrow and see if I find better mosfets.
That's all for now, hope to see others play with this stuff as well, its fun... just don't touch the wrong wires...
Dann
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Hello everyone.
Today I replaced the transistors with some better ones, then I tried a bunch of circuit configurations changing transformers and caps trying to get a cleaner sinewave and getting into ferroresonance, but the most I coud acheive was a blinking lightbulb (kind of the second mode of operation described in previous post) and the waveforms were pretty wobbly and irregular - not like a sinewave with lower harmonic at all. It kind of wanted to go into ferroresonance but couldn't do it. But I noticed when operating in this mode it would drain the battery slightly faster than normal.
Then I just gave up and hooked the circuit to a 1500W inverter connected to a large battery. The circuit operated just as if it would be hooked to the grid (as in the videos), and the battery was draining faster when the transformer got into ferroresonance. I'm sure the 5 to 10 watts that the lightbulb was consuming would not replenish the battery if I would loop the output to it.
For now that's all, I will be heading in a slightly different direction in the future, unless someone has some suggestions to try... I'm all ears...
Dann
