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GE Multilin 489 Generator Management Relay 3-15
3 USER INTERFACES 3.2 SOFTWARE INTERFACE
3
3.2.7 PHASORS
The 489PC software can be used to view the phasor diagram of three phase currents and voltages. The phasors are for:
• Phase Voltages A, B, and C
• Phase Currents A, B, and C
• Impedance Z
Loss
1. With 489PC running and communications established, open the Metering Data window by selecting the Actual >
Metering Data menu item then clicking the Phasors tab. The phasor diagram and the values of the voltage phasors are
displayed.
Longer arrows are the voltage phasors, shorter arrows are the current phasors.
2. Va and Ia are the references (i.e. zero degree phase). The lagging angle is clockwise.
Figure 3–9: PHASORS
NOTE
808713A1.CDR
VOLTAGE LEVEL
Displays the value and
the angle of the voltage
phasors
CURRENT PHASOR
Short arrow
VOLTAGE PHASOR
Long arrow
CURRENT LEVEL
Displays the value and angle
of the current phasors