I'm using ADE7758 & ADE7878 in my products.
All our system are in 4-wire Wye mode.
We try to connect the unit in 3-wire Delta mode but we have problem with the meassurments.
The problem is with the PF for each phase (1 & 2 , 3 in always zero in this mode).
Assume that every 1 second I read the energy registers (P & Q & S)
Is the total PF for the unit is equal to Total Active Energy (P) divide by Total Apparent energy (S) (P/S)?