Submitted by TrystanLea on Wed, 03/03/2010 - 02:06.
Hey Eric
The IR pulse detector method looks very neat, nice work! I like the pachube graphs you've got going too.
That's a good question on the voltage, If one leg is heavily loaded then it should have a slightly lower voltage than the lightly loaded leg. It would be interesting to see by how much the voltage varies on each leg, and whether the difference warrants making a second voltage measurement? I imagine the drawback of making a 2nd voltage measurement as well as already measuring two leg currents is that you'd start loosing a fair bit of resolution in time for the sampled waveforms...
I tried to see if I could find anything on the internet on differences in voltage, but didn't come across anything, I probably haven't looked in the right place as is with these things. If you come across anything or do some measurements I and I'm sure others would be interested in hearing about it :)
Hey Eric The IR pulse
Hey Eric
The IR pulse detector method looks very neat, nice work! I like the pachube graphs you've got going too.
That's a good question on the voltage, If one leg is heavily loaded then it should have a slightly lower voltage than the lightly loaded leg. It would be interesting to see by how much the voltage varies on each leg, and whether the difference warrants making a second voltage measurement? I imagine the drawback of making a 2nd voltage measurement as well as already measuring two leg currents is that you'd start loosing a fair bit of resolution in time for the sampled waveforms...
I made a 3 wire single phase LTspice simulation to better see what is going on here which may be useful: http://openenergymonitor.org/emon/sites/default/files/3WIRE.tar.gz
I tried to see if I could find anything on the internet on differences in voltage, but didn't come across anything, I probably haven't looked in the right place as is with these things. If you come across anything or do some measurements I and I'm sure others would be interested in hearing about it :)
Trystan