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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 an 8 Series Metering menu
Figure 6-3: An example of an 8 Series Metering\Summary submenu
6–2
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
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