Section 8 Measurement functions
8.1 Basic measurements
8.1.1 Functions
The three-phase current measurement function CMMXU is used for monitoring
and metering the phase currents of the power system.For variant J, the measured
phase currents are sampled through dedicated current channels.
The three-phase voltage measurement function VMMXU is used for monitoring
and metering the phase-to-phase voltages of the power system. The phase-to-earth
voltages are also available in VMMXU.
The residual current measurement function RESCMMXU is used for monitoring
and metering the residual current of the power system.
The residual voltage measurement function RESVMMXU is used for monitoring
and metering the residual voltage of the power system.
The sequence current measurement CSMSQI is used for monitoring and metering
the phase sequence currents.
The sequence voltage measurement VSMSQI 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 PEMMXU/MPEMMXU 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. PEMMXU/
MPEMMXU 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.
If the measured data is within parentheses, there are some problems
to express the data.
1YHT530004D05 D Section 8
Measurement functions
615 series 625
Technical Manual
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