Kapanadze Cousin - DALLY FREE ENERGY

[energia9]

Neon sign transformers are never overunity.  not even near...

[Farmhand]

Lol, you NST is of overunity.


INPUT: 230v and 0.42Amp = 96.6w
OUTPUT: 10KV and 30mAmp = 300w


Cheers
D.J

Yes I also questioned that and it turns out they are rated by open circuit voltage 10 kV and short circuit current 30 mA. Which makes sense if you are installing them, those figures can be used to determine output impedance I think.

So rated output is either 10 kV X zero amps (open circuit) or zero volts X 30 mA (short circuit). Or if a reasonable load is placed on it, real output Volts and Amps is somewhat less than both of those figures resulting in an actual output depending on load of somewhere between a bit less than 96.6 W and Nil.

Cheers

[Hoppy]

So rated output is either 10 kV X zero amps (open circuit) or zero volts X 30 mA (short circuit). Or if a reasonable load is placed on it, real output Volts and Amps is somewhat less than both of those figures resulting in an actual output depending on load of somewhere between a bit less than 96.6 W and Nil.

Cheers

Correct and something that has mislead some experimenters into thinking that their NST based device is running OU. Maybe even Don Smith???

[energia9]

Correct and something that has mislead some experimenters into thinking that their NST based device is running OU. Maybe even Don Smith???

don smith obviously missed electronics classes, he didnt know what he was talking about. seriously.
don smith might stumbled upon something like kapanadze, but he did not have a bleep what was going on.
my eyes turned many times when he talked. 

[Farmhand]

Just because I found it here is a link to a discussion between some fairly knowledgeable guys about NST Power outputs.
http://www.tesla-coil.com/nst-power-rating.htm

I think the thing they might be missing is that the secondary when near resonance is maybe experiencing a lot of recirculating current ect. while it is still getting power from the supply.

Here'e a quote, he says the Open circuit voltage and short circuit current on the nameplate can be achieved then the end line tells me the input would still match the output so that tells me when it's tuned to resonance the input goes up as well. Thing is too much voltage on the NST secondary will ruin it.   

Original poster: Ed Phillips

A few points on which I'd welcome comments. Assume an NST rated at 15000 volts OC and 60 ma SC.  The internal reactance will thus be (15000/0.06) = 250,000 ohms.  If a 250,000 ohm resistor is connected to the terminals the total secondary circuit impedance will be sqrt(250000^2+250000^2), or 353,533.3906 ohms [good to may 2 decimal places but the little calculator turns out nice long numbers]. The total current flowing will be 15,000/353500 = 0.0424 amperes and the total power dissipated in the resistor will be 0.0424^2 x 250,000 = 450 watts and is indeed half the nameplate rating.  Now change the situation a bit and put an 0.025 ufd capacitor (-106100 ohms reactance) in series with the resistor. The net circuit reactance is now (250000-106100) = 143899 ohms and the total impedance will be sqrt(250000^2+143899^2) = 288,456 ohms. The current flowing will be 15000/288456 = 0.052 amperes and the power in the resistive loat will be 0.052^2 x 250,000 =676 watts. Reducing the capacitance to 0.012 ufd (-221040 ohms) will result in a net reactance of about 29000 ohms and the total circuit impedance will be 251670 ohms; the current flowing will be 0.0596 amperes and the power in the resistor will be 880 watts. If the capacitance is reduced to the "matched" (resonant) value of 0.0106 ufd the circuit reactance will be zero and the voltage across the resistor will be 15000 and the power will be 900 watts. Think I got all those numbers OK but one can always make mistakes.

Bottom line is that with a load with capacitive reactance you can indeed get an output power equal to the nameplate OC voltage and SC current.  Since the leakage reactance is affected somewhat by the current flowing and is not necessarily exactly 250000 ohms these numbers are only approximate but they illustrate the principle.  Note that, if everything were linear, the open circuit voltage of the transformer would approach infinity (insulation would fail and/or core would saturate first) and the short circuit current would be limited only by the internal resistance of the transformer.

In TC operation the load is not resistive of course, but same very general principles apply.  I'm sure some of the amazing results reported for systems using NST's are the result of near-resonant operation of the secondary.

As for VA outputs greater than VA inputs I think such results have to be due to instrumentation errors.

Ed

A voice came to me and it said - "If you seek it, you shall find it." So I did a google search.