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1MAC050144-MB C
Section 8
Measurement functions
615 series ANSI
533
Technical Manual
Section 8
Measurement functions
8.1
Basic measurements
8.1.1
Functions
The single-phase power and energy measurement SPEMMXU and the three-phase power
and energy measurement PEMMXU are used for monitoring and metering the active
power (P), reactive power (Q), apparent power (S), power factor (PF) and for calculating
the accumulated energy separately as forward active, reversed active, forward reactive and
reversed reactive. PEMMXU calculates these quantities by using the fundamental
frequency phasors, that is, the DFT values of the measured phase current and phase voltage
signals.
The three-phase current measurement function, IA, IB, IC, is used for monitoring and
metering the phase currents of the power system.
The three-phase voltage measurement function, VA, VB, VC, is used for monitoring and
metering the phase-to-phase voltages of the power system. The phase-to-ground voltages
are also available in VA, VB, VC.
The ground current measurement function, IG, is used for monitoring and metering the
ground current of the power system.
The ground voltage measurement function, VG, is used for monitoring and metering the
ground voltage of the power system.
The sequence current measurement, I1, I2, I0, is used for monitoring and metering the
phase sequence currents.
The sequence voltage measurement, V1, V2, V0, is used for monitoring and metering the
phase sequence voltages.
The frequency measurement, FMMXU, is used for monitoring and metering the power
system frequency.
The three-phase power and energy measurement P, E is used for monitoring and metering
the active power P, reactive power Q, apparent power S, power factor PF and for
calculating the accumulated energy separately as forward active, reverse active, forward
reactive and reverse reactive. P, E calculates these quantities with the fundamental
frequency phasors, that is, the DFT values of the measured phase current and phase voltage
signals.
The information of the measured quantity is available for the operator both locally in
LHMI and remotely to a network control center with communication.
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