Reactive power - Reactive Generator research from GotoLuc - discussion thread

[gotoluc]

The first task is to try to replicate your results the way YOU produced them. So I am trying the measurements the same way you are doing them. If and when I get the same or similar results (i.e. a negative MEAN GRID power), then I can move on.

Okay, I understand. I posted above how to get there but you'll need a 100x probe to display the 240v

What do you mean you no longer know how to read it. It is the MEAN value as before. I see +194mW.

Okay, so you're sure by using the Inverted probe that the power I'm using from the grid is 194mW. If so, we have a big problem now!  because the load has 8 watts more than the input.

What to do now?

Luc

[gotoluc]

I guess I can try that, but you were getting it on a single phase. And I did isolate the gnd on my scope. Do you mean transformer isolation as well?

I have a 1 to 1 Isolation transformer on my scope. You'll need that for sure since the scope grounds will be connected to the other hot side of your 120v main.

Luc

[gotoluc]

I guess I can try that, but you were getting it on a single phase. And I did isolate the gnd on my scope. Do you mean transformer isolation as well?

You can also try 15uf or 20uf and see what you get on 120v alone.

Luc

[poynt99]

Okay, I understand. I posted above how to get there but you'll need a 100x probe to display the 240v

Not a problem, in fact I have a high voltage differential probe that I can use for that.

Okay, so you're sure by using the Inverted probe that the power I'm using from the grid is 194mW. If so we have a big problem because the load has 8 watts more than the input.

What to do now?

Luc

I am pretty sure the scope is correctly computing what you are giving it. I don't know however how exactly you have things set up inside the scope. Is the scope getting a clean measurement, and are there any issues with grounding? (rhetorical questions). Transformer isolation may be in order here, as I see a small voltage across the CSR even when the HOT is disconnected.

You measured the load with your DMM correct? It worries me a bit because of what I saw and the fact that the wave form it is reading is far from sinusoidal, and far from pure 60Hz.

Also, as I said at the present moment I am not very confident in the GRID power measurement itself.

Where to go from here? When things seem too good to be true in terms of power measurements, they usually are. Which means we should be finding a way to double check our findings. My feeling is that you might have a large reactance somewhere that is skewing the power measurement. You are getting almost zero Grid power, yet you are dissipating significant power in your load.

I don't know Luc. Send me your parts, and I'll send you mine?

[poynt99]

I'll have to bring in the isolation transformer from work. Do you also have the gnd isolated? I ask because even isolation transformers can carry the earth ground across.