Two-phase + neutral voltage and current manager

[6v6gt]

Is this anything similar ?

Two-phase measurement using arduino

So, i am working at a project which main focus is to use arduino to monitor two-phase non linear load, like a power mettering system with an option that allows me to see the power factor. The thing is, i dont even know where to start! I've managed to see alot of single-phase measurements, and they seem quite easy. Honestly, i've already seen a two-phase, but it does not calculate the power factor.