an external energy meter, for calculation of energy
consumption values. The pulses are captured by the binary
input module and then read by the PCFCNT function. A
scaled service value is available over the station bus. The
special Binary input module with enhanced pulse counting
capabilities must be ordered to achieve this functionality.
Function for energy calculation and demand handling
ETPMMTR
GUID-6898E29B-DA70-421C-837C-1BBED8C63A7A v3
Power system measurement (CVMMXN) can be used to
measure active as well as reactive power values. Function
for energy calculation and demand handling (ETPMMTR)
uses measured active and reactive power as input and
calculates the accumulated active and reactive energy
pulses, in forward and reverse direction. Energy values can
be read or generated as pulses. Maximum demand power
values are also calculated by the function. This function
includes zero point clamping to remove noise from the input
signal. As output of this function: periodic energy
calculations, integration of energy values, calculation of
energy pulses, alarm signals for limit violation of energy
values and maximum power demand, can be found.
The values of active and reactive energies are calculated
from the input power values by integrating them over a
selected time
tEnergy
. The integration of active and reactive
energy values will happen in both forward and reverse
directions. These energy values are available as output
signals and also as pulse outputs. Integration of energy
values can be controlled by inputs (STARTACC and
STOPACC) and
EnaAcc
setting and it can be reset to initial
values with RSTACC input.
The maximum demand for active and reactive powers are
calculated for the set time interval
tEnergy
and these values
are updated every minute through output channels. The
active and reactive maximum power demand values are
calculated for both forward and reverse direction and these
values can be reset with RSTDMD input.
18. Human machine interface
Local HMI
AMU0600442 v16
IEC13000239-3-en.vsd
IEC13000239 V3 EN-US
Figure 16. Local human-machine interface
The LHMI of the IED contains the following elements
• Graphical display capable of showing a user defined
single line diagram and provide an interface for controlling
switchgear.
• Navigation buttons and five user defined command
buttons to shortcuts in the HMI tree or simple commands.
• 15 user defined three-color LEDs.
• Communication port for PCM600.
The LHMI is used for setting, monitoring and controlling.
Remote IED access
Instead of the LHMI the Remote IED Access tool, RIA600,
can be used and perform all of the actions that a physical
LHMI can. The LHMI is then replaced by a blank front plate.
19. Basic IED functions
Time synchronization
M11344-3 v12
The time synchronization function is used to select a
common source of absolute time for the synchronization of
the IED when it is a part of a protection system. This makes
it possible to compare events and disturbance data between
all IEDs within a station automation system and in between
sub-stations. A common source shall be used for IED and
Line differential protection RED670
1MRK 505 379-BEN R
Version 2.2
58
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