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.
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 single-phase voltage measurement function VAMMXU is used for monitoring
and metering the phase-to-phase voltage of the power system. The phase-to-earth
voltage is also available in VAMMXU.
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 is used for monitoring
and metering the active power (P), reactive power (Q), apparent power (S) and
power factor (PF) and for calculating the accumulated energy separately as forward
active, reversed active, forward reactive and reversed reactive. PEMMXU calculates
these quantities using 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 or WHMI and remotely to a network control center with communication.
If the measured data in LHMI or WHMI is within parentheses, there are
some problems to express the data.
8.1.2 Measurement functionality
The functions can be enabled or disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
Measurement functions
1MRS757644 H
926 620 series
Technical Manual
To Next Page
Loading...
