1MAC309294-MB F Section 7
Measurement functions
RER620 383
Technical Manual
Section 7 Measurement functions
7.1 Basic measurements
7.1.1 Functions
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 three-phase power and energy measurement P,SP, E is used for monitoring and
metering the active power P, reactive power Q, apparent power S, power factor PF on
individual phases as well as three phase total and for calculating the accumulated energy
separately on three phase total basis as forward active, reverse active, forward reactive and
reverse reactive. P, SP, 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.
7.1.2 Measurement functionality
The functions can be enabled or disabled with the Operation setting. The corresponding
parameter values are Enable and Disable.
Some of the measurement functions operate on two alternative measurement modes:
“DFT” and “RMS”. The measurement mode is selected with the X Measurement mode
setting. Depending on the measuring function if the measurement mode cannot be
selected, the measuring mode is “DFT”.
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