Reactive power - Reactive Generator research from GotoLuc - discussion thread

[poynt99]

And personally; my scope (rigol ds10something), the math is done with the value shown on the screen and not what is in the sample buffer... so it's pathetic low resolution like that even though it's 2Msa stored....like the values change if I change the time...

The value changes with the Tek scopes too. Once you have about 10 or so cycles of the MATH trace, the value does not change even if you put more cycles on the screen.

The screen in these DSO's is closely tied to the resolution of the converters. The converters are 8-bit, and there is effectively one for positive and one for negative excursions. So the zero ref line is the LSB and the top and bottom of the screen is the MSB. That's why it is recommended that all your wave forms be placed at the center for best accuracy. You should also try to use most of the "vertical deflection" before clipping.

Until 12 or 16 bit high speed converters are affordable, we just have to live with this limitation.

[poynt99]

Poynt-How can we get the power factor of the tank circuit?. If i place my scope across the cap for volts,and use a CSR for amp's,and the two wave forms are in phase,dose this mean a power factor of 1?.

If the wave forms are like that posted (i.e. non-sinusoidal), it might be difficult to get the PF.

To get PF with two sine waves, you first obtain the phase angle (in degrees) between them. Then it is just a matter of taking the COS of the angle with your calculator.

COS 0º = 1
COS 45º = 0.707
COS 90º = 0

[poynt99]

Hi everyone,

I uploaded a video which is unlisted. I did this not to confuse other researcher from other sites and so on since this video is related to the discussion going on here.

So here is a test a la TinMan of my best score yet

Link to video: http://www.youtube.com/watch?v=CyoT9I3_93w&feature=youtu.be

I may also have another interesting thing in the works and will share when I confirm the ideal values for maximum output.

Stay tuned

Luc

Luc, isn't your watt meter plugged into the output of your generator?

Never mind. I see that it is plugged into the AC feed to the genset, which is feeding your motor.

[poynt99]

Luc
In regards to your last video-something seems not right. Are your DMM's reading rms voltage?. The reason i ask is this.
The prime mover uses 157-158 watt's-with or with out the reactive circuit switched on.
Without the reactive circuit switched on,your exciter circuit meters read this- 167.2volts @ 1.405 amp's. This is 234.916 watt's -asumeing a power factor of 1.

I'm sure most of that is apparent power. And the wave forms are probably similar to your own so the meter measurements aren't going to be very accurate.

[poynt99]

Below are the scope shots that acompany the above,but with the reactive circuit in place and running.

By eye-balling it, I would say the PF is pretty close to 0. Obviously it won't be zero because some power is being consumed by the exciter circuit.