16.2.1 Introduction
Outputs from the Measurements (CVMMXN) function can be used to calculate energy
consumption. Active as well as reactive values are calculated in import and export
direction. Values can be read or generated as pulses. Maximum demand power values
are also calculated by the function.
16.2.2 Principle of operation
The instantaneous output values of active and reactive power from the Measurements
(CVMMXN) function block are used and integrated over a selected time tEnergy to
measure the integrated energy. The energy values (in MWh and MVarh) are available
as output signals and also as pulsed output which can be connected to a pulse counter.
Outputs are available for forward as well as reverse direction. The accumulated energy
values can be reset from the local HMI reset menu or with input signal RSTACC.
The maximum demand values for active and reactive power are calculated for the set
time tEnergy and the maximum value is stored in a register available over
communication and from outputs MAXPAFD, MAXPARD, MAXPRFD, MAXPRRD
for the active and reactive power forward and reverse direction until reset with input
signal RSTDMD or from the local HMI reset menu.
P
Q
STACC
RSTACC
RSTDMD
TRUE
FALSE
FALSE
CVMMXN
IEC09000106.vsd
ETPMMTR
P_INST
Q_INST
IEC09000106 V1 EN
Figure 483: Connection of Energy calculation and demand handling function
(ETPMMTR) to the Measurements function (CVMMXN)
Section 16 1MRK505222-UUS C
Metering
988
Technical reference manual
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