WAGO SYSTEM 750 User Manual page 38

38 Function Description WAGO-I/O-SYSTEM 750
750-493 3-Phase Power Measurement Module
Apparent Power and Reactive Power
Not all loads are purely resistive in real supply networks. Phase shifting therefore
occurs between the current and the voltage. However, this does not affect the
method for determining the RMS values for current and voltage previously
described. They can both be obtained as measured values from the I/O module.
The apparent power (S) can be calculated from these measured values using the
following equation:
S = U · I
The reactive power (Q) can then be calculated using the following equation:
Q S 2 P 2
= −
Manual
Version 1.2.0