Power factor sign convention
Power factor sign (PF sign) can be positive or negative,
and is defined by the conventions used by IEC standards.
PF sign convention: IEC
PF sign correlates with the direction of real power (kW) flow.
-
Quadrant 1 and 4: Positive real power (+kW), the PF sign is positive (+).
-
Quadrant 2 and 3: Negative real power (-kW), the PF sign is negative (-).
IEC -1 to +1 format
|
Quadrant |
PF Range |
HMI Representation with sign |
PF in RS-485 Comm (Reg IEC format) |
|---|---|---|---|
|
Quadrant 1 |
0 to +1 |
Inductive (+) |
Positive Sign |
|
Quadrant 2 |
-1 to 0 |
Capacitive (-) |
Negative sign |
|
Quadrant 3 |
0 to -1 |
Inductive (-) |
Negative Sign |
|
Quadrant 4 |
+1 to 0 |
Capacitive(+) |
Positive Sign |
Sample screen
