I get from a Landis+Ggyr E650 electricity meter data via a serial IR head (62056-21 / D0) about every 20s. This meter provides a lot of data, but not the current actual active power (kW).
Some of the meter data is voltage, current and phase angles shown as followed.
CurrentL1 = 3.43 A CurrentL2 = 3.35 A CurrentL3 = 3.36 A CurrentN = 0.04 A VoltageL1_N = 241.1 V VoltageL2_N = 241.4 V VoltageL3_N = 241.3 V Angle U (L1) to U (L1) = 0*Deg Angle U (L2) to U (L1) = 120*Deg Angle U (L3) to U (L1) = 240*Deg Angle I (L1) to U (L1) = 200*Deg Angle I (L2) to U (L1) = 321*Deg Angle I (L3) to U (L1) = 80*Deg
I know in general the formula P = U * I * cos phi * sqrt(3), but I am not sure how I can use these single phase values shown above to do that calculation.
How can I calulcate with these values above the 3-phase actual active power in kW?
PS: I also know that it is possible to do a power calculation by two kWh readings and time measurement, but it looks the meter is not updating the kWh counter very regularily and it takes a too long time difference (~2min) to get stable atual values.