Direction Of Power And Current - Allen-Bradley Rockwell Automation 857 User Manual

5-8
Measurement Functions
Direction of Power and
Current
857-UM001A-EN-P – July 2009
Figure 5.2 shows the concept of three phase current direction and
sign of cosϕ and power factor PF. Figure 5.3 shows the same
concepts, but on a PQ-power plane.
Figure 5.2 – Quadrants of Voltage/Current Phasor Plane
Figure 5.3 – Quadrants of Power Plane
Table 5.14 – Table of Power Quadrants
Power Current related
Quadrant to voltage
+ inductive Lagging
+ capacitive Leading
inductive Leading
capacitive Lagging
Power
cos
Direction
Forward +
Forward +
Reverse
Reverse
Power Factor
PF
+
+