6–2 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: METERING
The relay measures all RMS (root mean square) currents and voltages, frequency, and all
auxiliary analog inputs. Other values like neutral current, phasor symmetrical
components, power factor, power (real, reactive, apparent), are derived. A majority of these
quantities are recalculated every protection pass and perform protection and monitoring
functions. Displayed metered quantities are updated approximately three (3) times a
second for readability. All phasors and symmetrical components are referenced to the A-N
voltage phasor for wye-connected VTs; to the A-B voltage phasor for delta-connected VTs;
or to the phase A current phasor when no voltage signals are present.
Figure 6-2: An example of the Metering menu
Figure 6-3: An example of the Metering\Summary submenu
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