Yes, triphase is used much in commercial and industrial building, because it is more efficient to transfer power (less coper, better AC engine)... Rectifier also are more efficient in triphase (less ripple).
Beside to be clear triphase power meter are roughly simply some Digital signal processor connected to 6 Analog Digital converters. It compute the integral of voltage multiplied by current every 16µs for our case... It can also compute some spectrum of current, of voltage, compute harmonics, compute angle of fundamental current to voltage (the phase), compute effective current or voltage (integrating square current and squarerooting the total), apparent power (product of apparent votage and current), the reactive power (power that oscillate during the cycle because of phase shift), the deforming power (power transported wayin-wayout in harmonics), and the matching ratio to real power It can compute total energy like a home energymeter, just by adding his mesures over long time, like it does over short time to show power. it can be fooled mostly two way : - signal too fast for the sampling rate of 16µs (above 30kHz)... beware because nonlinearities may transfor HF into lower frequency that are visible, and would look strange, yet cause no power ... Question is whether they were allowed to look at the transient ? - DC offset , or too low frequency if they use classic magnetic clamps, or capacitors to filter DC and LF to be honest to rule out those question I would propose two thing : use a 1/1 transformer (triphase) use HF balast/filters to swallow any HF from the socket. add to that that I propose that the power meter like the one of nelson, be plugged, and not use clamps. If plugged, and using an ACDC instruments, only HF may fool the power metter and few capacitors and ferrite may blocks transient. note that rossi device should also have filter to respect EMF regulation, but skeptics don't trust him... Should! I'm afraid it is not yet the case, or he won't be so afraid about retro engineering of his waveforms 2013/5/28 Jed Rothwell <[email protected]> > Andrew <[email protected]> wrote: > > ** >> I said >> *The measurement task has been made unnecessarily difficult by >> specifying 3-phase input to the control box. Normal single-phase input >> would suffice here, given the power levels.* >> > > There is nothing "difficult" about measuring 3-phase power. Power meters > have been doing this for 130 years. > > Buildings in industrial parks are often served with 3-phase power. I > assume Rossi is developing his control circuitry to work with 3-phase power > for this reason. There is nothing nefarious about that. > > - Jed > >
