So I have a circuit what is able to measure correctly Irms, Vrms, W, VA, Wh, VAh and power factor in a 4-wire wye load (CONSEL = 00). In that configuration the neutral wire acts as ground of the circuit.
I want the same circuit to be able to measure 3-wire delta loads (CONSEL = 01). My approach is to connect Vb with N so that Vb is now the ground for the circuit. In this case I have correct measurements for V12 and V23, but V31 is 0. Is there any way that I can get the V31 value?