gefran GPC - 3.11. Measuring the Power on the Load and Energy Consumed

81901 “MSW_GPC-40/600A”_03-2021_ENG_page 34
3.11. Measuring the power on the load and energy consumed
The Advanced Power Controller is able to measure the in-
stantaneous active power value on the load and the energy
consumed since the first power-on or the last reset. The pa-
rameters present depend on the type of load (single-phase
or three-phase).
The update in the non-volatile memory takes place every
two hours and when the line voltage is disconnected.
The load impedance value of the individual module is also
available; if the load is three-phase, the impedance value is
the total value. For loads such as IR lamps, the impedance
value can vary greatly depending on the power transferred
to the load.
The following diagrams show the processing sequences to
arrive at the active power, energy consumed and imped-
ance values.
Single-phase load
Three-phase load
Phase 1 (L1)Phase 2 (L2)Phase 3 (L3)
(*) with BIPHASE command the value Ld.P_3 is obtained as the average of the values Ld.P_1 and Ld.P_2
×
×
Ld.V
Ld.A
RMS load voltage
Ld.V
Energy variables
Ld.E1, Ld.E2
Time elapsed
from power-on
or reset
RMS load current
Ld.A
Impedance
Ld.I
Filter
Cos.F
Active
power
Ld.P
×
×
×
×
×
×
∑ * ∑
Ld.V.t
Ld.A.t
RMS load voltage
Ld.V_1
RMS load voltage
Ld.V_2
RMS load voltage
Ld.V_3
Energy variables
Ld.E1_1, Ld.E2_1
Energy variables
Ld.E1_2, Ld.E2_2
Energy variables
Ld.E1_3, Ld.E2_3
Time elapsed
from power-on
or reset
Time elapsed
from power-on
or reset
Time elapsed
from power-on
or reset
RMS load current
Ld.A_1
RMS load current
Ld.A_2
RMS load current
Ld.A_3
Impedance
Ld.I.t
Active power
Ld.P.t
Energy variables
Ld.E1.t
Ld.E2.t
Power
factor
Cos.F_1
Power
factor
Cos.F_2
Power
factor
Cos.F_3
Average
values
Ld.V.t
Average
values
Ld.A.t
Active
power
Ld.P_1
Active
power
Ld.P_2
Active *
power
Ld.P_3