42 Function Description
WAGO I/O System 750 XTR
750-495/040-010 3-Phase POM 20KV 300A XTR
Manual
Version 1.0.0
The
PF power factor
is the quotient of the active power (P) and apparent power
(S) and takes the entire spectrum into account, i.e., the fundamental component
and the upper harmonics.
PF = P / S
•
Positive (plus) sign:
import of active power from the network
•
Negative (minus) sign: export of active power to the network
The
LF power factor
is the quotient of the amount for active power (P) and
apparent power (S), multiplied by the sign of the reactive power (Q), and takes
the entire spectrum into account, i.e., the fundamental component and the upper
harmonics:
LF = sign Q × |P| / S
•
Positive (plus) sign:
positive reactive power
•
Negative (minus) sign: negative reactive power
Jump of LF power factor from +1 to −1
The LF value can jump b1 and −1 when reactive power is ve
ry low. This
behavior occurs as a result of digitization noise.
The 4-quadrant representation has the following form:
Figure 9: 4-Quadrant Representation for Active and Reactive Power
The 4-quadrant representation is also shown in WAGO-I/O-
CHECK
for the
“Overview,” “Phase, Lx” and “Power” measured value views in the “3-Phase
Power Measurement Module” dialog field.
Phase Angle
The phase angle between voltage and current is calculated for each phase using
time-synchronous sampling. The phase angle is indicated in degrees.
