Hello everyone, did anyone try to replicate this effect? I kind of did, but playing it safe (to not burn up any appliances in the house), I used another slightly biggger transformer before the one that was trying to get the effect from. I was unable to maintain the resonance with any 230v lightbulb attached to the primary of the transformer, but I attached an automotive 12V/5W bulb to the 15V secondary (actually outputing 8V or so in the normal operating mode) and when quickly shorting it a few times the transformer would get louder (in resonance) and the voltage at the primary would shoot up to 380V, and on the secondary the lightbulb would get much brighter at around 24V. I kept it in resonance for max. 15 seconds, as the transformer quickly heats up and at times I would hear the windings slightly crackling.
I had everything wired up through a circuit breaker and a watt meter. I noticed when the resonance effect would kick in, the consumption would shoot up to about 120W (well above transformer specs - 90VA), even with no load attached.
So for the isolation transformer I used a 150VA 230V to 110V and for the resonating transformer wired after that I used a 90VA 230V to 15V (just what I had at hand) and the capacitor 10uF 450VAC.
At times when shorting the secondary I would get an ongoing ondulation of the sinewave kind of flickering but at normal brightness and consumption.
If you aren't confident and experienced with mains voltage and above, stay away from all this - It bites really good
Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
Dann
I have not done exactly this but have done plenty of very similar things. The capacitor is limiting current to the bulb until the traffo secondary is closed, sending the LC circuit into resonance. In resonance, more current can flow through the circuit because the reactance of the cap is cancelled by resonating with the transformer's inductance (sorry if my terminology is wrong, I'm not an EE, just tinkerer) The source is providing all the power and the transformer is not doing any useful work. I believe that ferrorrsonance may be a path to OU but what is demonstrated here is just LC resonance, according to my understanding. In my experiences trying to explore ferro resonant phenomena, consumer transformers overheat at power levels lower than those required to properly saturate the core.
Kind regards, Sandy.
(09-02-2024, 06:15 PM)Sandy Wrote: [ -> ]I have not done exactly this but have done plenty of very similar things. The capacitor is limiting current to the bulb until the traffo secondary is closed, sending the LC circuit into resonance. In resonance, more current can flow through the circuit because the reactance of the cap is cancelled by resonating with the transformer's inductance (sorry if my terminology is wrong, I'm not an EE, just tinkerer) The source is providing all the power and the transformer is not doing any useful work. I believe that ferrorrsonance may be a path to OU but what is demonstrated here is just LC resonance, according to my understanding. In my experiences trying to explore ferro resonant phenomena, consumer transformers overheat at power levels lower than those required to properly saturate the core.
Kind regards, Sandy.
Please ignore my previous post. I felt like a dickgead for expressing an opinion so did the experiment and could not achieve the demonstrated result. I could only find LC resonance condition with transformer secondary unloaded, not shorted as demonstrated in holder video.
Kind Regards, Sandy.
(09-03-2024, 01:09 AM)Sandy Wrote: [ -> ] (09-02-2024, 06:15 PM)Sandy Wrote: [ -> ]I have not done exactly this but have done plenty of very similar things. The capacitor is limiting current to the bulb until the traffo secondary is closed, sending the LC circuit into resonance. In resonance, more current can flow through the circuit because the reactance of the cap is cancelled by resonating with the transformer's inductance (sorry if my terminology is wrong, I'm not an EE, just tinkerer) The source is providing all the power and the transformer is not doing any useful work. I believe that ferrorrsonance may be a path to OU but what is demonstrated here is just LC resonance, according to my understanding. In my experiences trying to explore ferro resonant phenomena, consumer transformers overheat at power levels lower than those required to properly saturate the core.
Kind regards, Sandy.
Please ignore my previous post. I felt like a dickgead for expressing an opinion so did the experiment and could not achieve the demonstrated result. I could only find LC resonance condition with transformer secondary unloaded, not shorted as demonstrated in holder video.
Kind Regards, Sandy.
Hi Sandy, I can see the secondary open in the video, he only uses to make a spark so you might have been right.
(09-02-2024, 04:53 PM)kapierenundkopieren Wrote: [ -> ]Hello everyone, did anyone try to replicate this effect? I kind of did, but playing it safe (to not burn up any appliances in the house), I used another slightly biggger transformer before the one that was trying to get the effect from. I was unable to maintain the resonance with any 230v lightbulb attached to the primary of the transformer, but I attached an automotive 12V/5W bulb to the 15V secondary (actually outputing 8V or so in the normal operating mode) and when quickly shorting it a few times the transformer would get louder (in resonance) and the voltage at the primary would shoot up to 380V, and on the secondary the lightbulb would get much brighter at around 24V. I kept it in resonance for max. 15 seconds, as the transformer quickly heats up and at times I would hear the windings slightly crackling.
I had everything wired up through a circuit breaker and a watt meter. I noticed when the resonance effect would kick in, the consumption would shoot up to about 120W (well above transformer specs - 90VA), even with no load attached.
So for the isolation transformer I used a 150VA 230V to 110V and for the resonating transformer wired after that I used a 90VA 230V to 15V (just what I had at hand) and the capacitor 10uF 450VAC.
At times when shorting the secondary I would get an ongoing ondulation of the sinewave kind of flickering but at normal brightness and consumption.
If you aren't confident and experienced with mains voltage and above, stay away from all this - It bites really good Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
Dann
Hi Dann, that is a pretty cool experiment you did. You know what would be interesting to find out? You say that the consumption would shoot up to 120 W, but was it all consumption? What if some of that power was reflected power, or somehow power gained in resonance.
Just an open question, I do not know the answer myself, I'd have to start with DC and put diodes to know which way the energy is going
Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
Hmmm, just happen to have the transformer, a globe and a 450V 10uF starter cap.
Not so sure about letting out the evil vibration or taking out the house power, and he made it pretty clear not to blame him
Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
Thanks for the transcript... lol
Hi all and thanks for the comments.
Sandy, as far as i know, holder only breafly shorts the secondary, then the resonance kicks in. I did the same, but with a small automotive bulb attached to the secondary - I couldn't get the resonance to stay on when connecting any 230V bulb to the primary - It would kill it instantly. I think it would probably work if I would do it like Holder - directly from the grid, but instead I used an isolation transformer (for safety reasons), so my effect was much smaller.
kloakez, the other day I watched a video about ferroresonance in power grid transformers. It was explained that the effect happens because the inductive reactance of the transformer windings cancels out with the capacitive reactance of the wires leading to and from the transformer. So when the conditions are right, only pure resistance of the transformer windings remains, this means the windings heat up and the transformer explodes.
Whether is it reflected power or gained in the process, I will try to find out. 120W was just what the watt meter showed, but it might not know what it is looking at
Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
I have been playing with resonance quite a bit recently. I started with two identical air coils with matched capacitors connected in series. The input was 9 V square wave and at the resonant frequency of about 1.2 MHz the voltage went up to 100 V, so I had an idea to put a sendust core inside the air coils (they are good for high frequency applications) and the voltage increased to over 200 V (the relative permeability of the cores is about 2.6) while the resonant frequency went to about half, so about 600 kHz. It will light a neon light bulb with a current draw in microamps, but after the neon bulb was connected, the voltage went to almost nothing. So more experiments are waiting until I get some gate driver which can deliver some current to see what I can power with it.
I guess what I am trying to say is, what the guy shows in the video is a series resonant circuit, it increases voltage, that is what they do. He has it connected to the mains which will supply the current, there is no power measurement. So while the video is quite interesting and kudos to the guy for showing resonance, I believe we can make better experiments with better results.
I've watched the video and read the translated transcript.
This is what I think is happening:
He is shorting the secondary briefly, during which time a large magnetic field is built up around the secondary winding. Since the transformer has a silicon steel core, the magnetic field is concentrated within the core. When he unshorts the secondary the magnetic field collapses and generates a large EMF on the primary due to the rate of change of the magnetic flux, which is explained by Faraday's law.
I'd say that then he touches the contacts of the secondaries, he creates sparks, as in spark gap, which contains a rich spectrum of frequencies out of which there is a narrow band, the resonance frequency of the series capacitance/inductance, that is ringing for some time at some resonant frequency... that I'd say is not 50 Hz. And by analyzing the audio of the video it seems to be 100 Hz (see attached image). It may happen that frequencies below 80 Hz are cut off due to audio compression but if the fundamental frequency was 50 Hz, then there would be peaks at 150 Hz which are missing. From the resonant requency and known capacitor value it is possible to get inductance of the inductor too.
Then if there is a signal that is combining 50 Hz and 100 Hz, then who knows what his voltmeter is measuring since they are made for measuring harmonic signals.
However what he is doing is entirely possible if better designed.
[
attachment=1374]
Hi kloakez.
The frequency at wich the transformer resonates is exactly the grid frequency (50Hz) but you hear the noise of 100Hz because the core of the transformer magnetizes twice in a sinewave.
From my experience the value of the capacitor has little to do with the ferromagnetic resonant frequency in this case, I was able to get the transformer to resonate with a value of 1Uf as well as 10Uf and probably all in between. the value of the capacitor has more to do with the intesity of the ferroresonance.
Will try some more experimenting tomorrow...
Dann